Home » Public Forums » GMCnet » Horse power....
| Horse power.... [message #348760] |
Tue, 01 October 2019 09:23  |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
|
Senior Member |
|
|
Ok so there is "no replacement for displacement" but i know we are limited. So far it looks like one can move to a Cad 500, twin turbo a la JimK..... has anyone tried a ProCharger? (Belt driven super charger)
The wife wants to tackle the Rockie Mounts and the Smokey Mountain in the next couple years and has expressed vocally that the coach is a "sled" on the hills....lol.
Rich Mondor,
Brockville, ON
77 Hughes 2600
|
|
|
|
| Re: [GMCnet] Horse power.... [message #348761 is a reply to message #348760] |
Tue, 01 October 2019 09:40  |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
|
|
Change the final drive gearing, sail over the hills, and spend the money
you would have spent on the supercharger to buy us all a round or two next
time we meet.
Jim Hupy
Salem, Oregon
On Tue, Oct 1, 2019, 7:24 AM tonka6cuda6--- via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Ok so there is "no replacement for displacement" but i know we are
> limited. So far it looks like one can move to a Cad 500, twin turbo a la
> JimK.....
> has anyone tried a ProCharger? (Belt driven super charger)
>
> The wife wants to tackle the Rockie Mounts and the Smokey Mountain in the
> next couple years and has expressed vocally that the coach is a "sled" on
> the hills....lol.
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
| Re: [GMCnet] Horse power.... [message #348763 is a reply to message #348761] |
Tue, 01 October 2019 09:56 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
|
Senior Member |
|
|
What is the recommended gearing Jim? And id be happy to buy you folks a round or 2 of Canadian beers....lol.
James Hupy wrote on Tue, 01 October 2019 10:40Change the final drive gearing, sail over the hills, and spend the money
you would have spent on the supercharger to buy us all a round or two next
time we meet.
Jim Hupy
Salem, Oregon
On Tue, Oct 1, 2019, 7:24 AM tonka6cuda6--- via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Ok so there is "no replacement for displacement" but i know we are
> limited. So far it looks like one can move to a Cad 500, twin turbo a la
> JimK.....
> has anyone tried a ProCharger? (Belt driven super charger)
>
> The wife wants to tackle the Rockie Mounts and the Smokey Mountain in the
> next couple years and has expressed vocally that the coach is a "sled" on
> the hills....lol.
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Rich Mondor,
Brockville, ON
77 Hughes 2600
|
|
|
|
| Re: [GMCnet] Horse power.... [message #348765 is a reply to message #348763] |
Tue, 01 October 2019 10:06 |
Mike Kelley
Messages: 467
Registered: February 2017
Karma: -2
|
Senior Member |
|
|
Tonka6:
I am not a mechanic or expert, but I have heard many an expert recommend the 3:70 final drive upgrade as opposed to the 3:55 or 4:10s that are also available.
My buddy Bob Dunahugh tows a 17,000 # race car & trailer behind his 3:70 final drive GMC without a problem - has for years and lots of cross country miles.
When I do my 28’ stretch, I am going w/ the 3:70 final drive from Jim Kanomata.
Just my humble opinion!
Mike/The Corvair a holic
Sent from my iPhone
> On Oct 1, 2019, at 9:56 AM, tonka6cuda6--- via Gmclist wrote:
>
> What is the recommended gearing Jim? And id be happy to buy you folks a round or 2 of Canadian beers....lol.
>
> James Hupy wrote on Tue, 01 October 2019 10:40
>> Change the final drive gearing, sail over the hills, and spend the money
>> you would have spent on the supercharger to buy us all a round or two next
>> time we meet.
>> Jim Hupy
>> Salem, Oregon
>>
>> On Tue, Oct 1, 2019, 7:24 AM tonka6cuda6--- via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>> Ok so there is "no replacement for displacement" but i know we are
>>> limited. So far it looks like one can move to a Cad 500, twin turbo a la
>>> JimK.....
>>> has anyone tried a ProCharger? (Belt driven super charger)
>>>
>>> The wife wants to tackle the Rockie Mounts and the Smokey Mountain in the
>>> next couple years and has expressed vocally that the coach is a "sled" on
>>> the hills....lol.
>>> --
>>> Rich Mondor,
>>>
>>> Brockville, ON
>>>
>>> 77 Hughes 2600
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
| Re: [GMCnet] Horse power.... [message #348767 is a reply to message #348765] |
Tue, 01 October 2019 10:19 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
|
Senior Member |
|
|
Ok thats sounds realistic. I have 4:11 in my car and they are not the best on the highway....lol.
Mike Kelley wrote on Tue, 01 October 2019 11:06Tonka6:
I am not a mechanic or expert, but I have heard many an expert recommend the 3:70 final drive upgrade as opposed to the 3:55 or 4:10s that are also available.
My buddy Bob Dunahugh tows a 17,000 # race car & trailer behind his 3:70 final drive GMC without a problem - has for years and lots of cross country miles.
When I do my 28' stretch, I am going w/ the 3:70 final drive from Jim Kanomata.
Just my humble opinion!
Mike/The Corvair a holic
Sent from my iPhone
> On Oct 1, 2019, at 9:56 AM, tonka6cuda6--- via Gmclist wrote:
>
> What is the recommended gearing Jim? And id be happy to buy you folks a round or 2 of Canadian beers....lol.
>
> James Hupy wrote on Tue, 01 October 2019 10:40
>> Change the final drive gearing, sail over the hills, and spend the money
>> you would have spent on the supercharger to buy us all a round or two next
>> time we meet.
>> Jim Hupy
>> Salem, Oregon
>>
>> On Tue, Oct 1, 2019, 7:24 AM tonka6cuda6--- via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>> Ok so there is "no replacement for displacement" but i know we are
>>> limited. So far it looks like one can move to a Cad 500, twin turbo a la
>>> JimK.....
>>> has anyone tried a ProCharger? (Belt driven super charger)
>>>
>>> The wife wants to tackle the Rockie Mounts and the Smokey Mountain in the
>>> next couple years and has expressed vocally that the coach is a "sled" on
>>> the hills....lol.
>>> --
>>> Rich Mondor,
>>>
>>> Brockville, ON
>>>
>>> 77 Hughes 2600
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Rich Mondor,
Brockville, ON
77 Hughes 2600
|
|
|
|
| Re: [GMCnet] Horse power.... [message #348771 is a reply to message #348767] |
Tue, 01 October 2019 10:49 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
|
Senior Member |
|
|
3.70 is pretty awesome. UNLESS you like to drive >70 on the freeway.
Me I like to take the 2 lane roads and with 3.70 it is a lot happier on the rolling hills.
And yeah, if you step on it, it will go
________________________________
From: Gmclist on behalf of tonka6cuda6--- via Gmclist
Sent: Tuesday, October 1, 2019 10:19 AM
To: gmclist@list.gmcnet.org
Cc: tonka6cuda6@hotmail.com
Subject: Re: [GMCnet] Horse power....
Ok thats sounds realistic. I have 4:11 in my car and they are not the best on the highway....lol.
Mike Kelley wrote on Tue, 01 October 2019 11:06
> Tonka6:
> I am not a mechanic or expert, but I have heard many an expert recommend the 3:70 final drive upgrade as opposed to the 3:55 or 4:10s that are
> also available.
> My buddy Bob Dunahugh tows a 17,000 # race car & trailer behind his 3:70 final drive GMC without a problem - has for years and lots of cross
> country miles.
> When I do my 28' stretch, I am going w/ the 3:70 final drive from Jim Kanomata.
> Just my humble opinion!
> Mike/The Corvair a holic
>
> Sent from my iPhone
>
>> On Oct 1, 2019, at 9:56 AM, tonka6cuda6--- via Gmclist wrote:
>>
>> What is the recommended gearing Jim? And id be happy to buy you folks a round or 2 of Canadian beers....lol.
>>
>> James Hupy wrote on Tue, 01 October 2019 10:40
>>> Change the final drive gearing, sail over the hills, and spend the money
>>> you would have spent on the supercharger to buy us all a round or two next
>>> time we meet.
>>> Jim Hupy
>>> Salem, Oregon
>>>
>>> On Tue, Oct 1, 2019, 7:24 AM tonka6cuda6--- via Gmclist > gmclist@list.gmcnet.org> wrote:
>>>
>>>> Ok so there is "no replacement for displacement" but i know we are
>>>> limited. So far it looks like one can move to a Cad 500, twin turbo a la
>>>> JimK.....
>>>> has anyone tried a ProCharger? (Belt driven super charger)
>>>>
>>>> The wife wants to tackle the Rockie Mounts and the Smokey Mountain in the
>>>> next couple years and has expressed vocally that the coach is a "sled" on
>>>> the hills....lol.
>>>> --
>>>> Rich Mondor,
>>>>
>>>> Brockville, ON
>>>>
>>>> 77 Hughes 2600
>>>>
>>>> _______________________________________________
>>>> GMCnet mailing list
>>>> Unsubscribe or Change List Options:
>>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>>
>> --
>> Rich Mondor,
>>
>> Brockville, ON
>>
>> 77 Hughes 2600
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
--
Rich Mondor,
Brockville, ON
77 Hughes 2600
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
|
|
|
|
| Re: Horse power.... [message #348774 is a reply to message #348760] |
Tue, 01 October 2019 11:05 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
|
Senior Member |
|
|
Can you just change the gears and chain instead of the final drive? Just seems much easier in theory.....havent actually looked at it.
Rich Mondor,
Brockville, ON
77 Hughes 2600
|
|
|
|
| Re: [GMCnet] Horse power.... [message #348776 is a reply to message #348767] |
Tue, 01 October 2019 11:10 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
|
|
The gearing discussions kinda center around coach size, 23 vs 26, and
towing heavy vs not towing, and finally, 403 vs 455.
It goes something like this:
If you tow heavy, or have a 403 engine in a 26 foot coach, then the 3:70 or
even the 4:10 is what you want.
If you have a light 26 ft or a 23 ft and you do not tow, then a 3:55 will
suffice with a 455.
But, this is not chiseled in stone. And still subject to discussion.
Personally, I have a late 1978 Royale that has a 403, and I sometimes
tow a trailer. So, I have a 3:70 in my coach with Doug Thorley Ceramic
coated headers, a recurved HEI ignition, properly adjusted for the headers
and recurved ignition Quadrajet. It will pull the grapevine coming out of
LA without downshifting.
Coming Northbound over the Siskiyou's on interstate 5, there is one long
uphill that I shift into 2nd for, the other small passes like Wolf Creek I
pull in top gear. So, I can easily run 75 mph anytime I choose. The 403
loves the higher rpms. Never over 3600 rpms except when I downshift.
Jim Hupy
Salem, Oregon
On Tue, Oct 1, 2019, 8:20 AM tonka6cuda6--- via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Ok thats sounds realistic. I have 4:11 in my car and they are not the best
> on the highway....lol.
>
> Mike Kelley wrote on Tue, 01 October 2019 11:06
>> Tonka6:
>> I am not a mechanic or expert, but I have heard many an expert recommend
> the 3:70 final drive upgrade as opposed to the 3:55 or 4:10s that are
>> also available.
>> My buddy Bob Dunahugh tows a 17,000 # race car & trailer behind his 3:70
> final drive GMC without a problem - has for years and lots of cross
>> country miles.
>> When I do my 28' stretch, I am going w/ the 3:70 final drive from Jim
> Kanomata.
>> Just my humble opinion!
>> Mike/The Corvair a holic
>>
>> Sent from my iPhone
>>
>>> On Oct 1, 2019, at 9:56 AM, tonka6cuda6--- via Gmclist wrote:
>>>
>>> What is the recommended gearing Jim? And id be happy to buy you folks
> a round or 2 of Canadian beers....lol.
>>>
>>> James Hupy wrote on Tue, 01 October 2019 10:40
>>>> Change the final drive gearing, sail over the hills, and spend the
> money
>>>> you would have spent on the supercharger to buy us all a round or
> two next
>>>> time we meet.
>>>> Jim Hupy
>>>> Salem, Oregon
>>>>
>>>> On Tue, Oct 1, 2019, 7:24 AM tonka6cuda6--- via Gmclist >
> gmclist@list.gmcnet.org> wrote:
>>>>
>>>> > Ok so there is "no replacement for displacement" but i know we are
>>>> > limited. So far it looks like one can move to a Cad 500, twin turbo
> a la
>>>> > JimK.....
>>>> > has anyone tried a ProCharger? (Belt driven super charger)
>>>> >
>>>> > The wife wants to tackle the Rockie Mounts and the Smokey Mountain
> in the
>>>> > next couple years and has expressed vocally that the coach is a
> "sled" on
>>>> > the hills....lol.
>>>> > --
>>>> > Rich Mondor,
>>>> >
>>>> > Brockville, ON
>>>> >
>>>> > 77 Hughes 2600
>>>> >
>>>> > _______________________________________________
>>>> > GMCnet mailing list
>>>> > Unsubscribe or Change List Options:
>>>> > http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>> >
>>>> _______________________________________________
>>>> GMCnet mailing list
>>>> Unsubscribe or Change List Options:
>>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>>>
>>> --
>>> Rich Mondor,
>>>
>>> Brockville, ON
>>>
>>> 77 Hughes 2600
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
>
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
|
|
|
|
| Re: Horse power.... [message #348778 is a reply to message #348760] |
Tue, 01 October 2019 11:36 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
|
Senior Member |
|
|
Ok....i have a 26' with a 403....i dont plan on towing a trailer at this point in time. So i think the smart choice here will be 3:70 as it seems to an all around ratio.
Future ..will add headers and probably EFI but gotta get the thing safety inspected first which means at least one windshield....got the exhaust leak fixed so hopefully ill try a glass repair and see if thats good enough.
Rich Mondor,
Brockville, ON
77 Hughes 2600
|
|
|
|
| Re: [GMCnet] Horse power.... [message #348780 is a reply to message #348778] |
Tue, 01 October 2019 12:08 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
|
Senior Member |
|
|
This is kind of off-topic.
I think that if you fix the problem by putting more HP into the system puts
more stress on the transmission and FD. Does going to a lower FD ratio
increase FD transmission reliability?
On Tue, Oct 1, 2019 at 9:37 AM tonka6cuda6--- via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Ok....i have a 26' with a 403....i dont plan on towing a trailer at this
> point in time. So i think the smart choice here will be 3:70 as it seems to
> an all around ratio.
>
> Future ..will add headers and probably EFI but gotta get the thing safety
> inspected first which means at least one windshield....got the exhaust leak
> fixed so hopefully ill try a glass repair and see if thats good enough.
> --
> Rich Mondor,
>
> Brockville, ON
>
> 77 Hughes 2600
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
*John Phillips*
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
|
|
|
|
|
|
| Re: Horse power.... [message #348783 is a reply to message #348778] |
Tue, 01 October 2019 12:37 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
|
Senior Member |
|
|
I made similar modifications as Jim Hupy to my 455. That would be my suggestion especially if you travel in mountain country in flat lands maybe the 3:55 would suffice. Actually the lower gears may yield better fuel mileage as you don't lug the motor as much.
Roy Keen
Minden,NV
76 X Glenbrook
|
|
|
|
| Re: Horse power.... [message #348786 is a reply to message #348760] |
Tue, 01 October 2019 13:22 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
|
Senior Member |
|
|
As for gearing, I find that the 3.42 gears that my beloved PO installed are perfect for my 26' Royale (heavy) coach, with its mighty 403. Living in the west, those gears seem to be right at home at any reasonable cruising speed from 60 to 75mph, and from what I can tell don't have a real negative impact on gas mileage (not sure that would be the case with a much higher numerical gear set). If I was going to tow anything heavy, I'd opt for a set of 3.70 or similar, no doubt.
The only problems I ever ran into was above 6,000' of altitude (which happens a lot with Flagstaff being just "up the hill" from Mesa, at 7,500' with lots of 6-7° hills to climb). The carb was fine below that level, but any time I was going up a hill above about 6,000' the motor just ran out of steam and I'd be mashing my right foot into the carpet, downshifting sometimes to first to generate enough power.
Fast-forward to my last trip to the Grand Canyon, after installing the FiTech fuel injection system. Now it just cruises up the hills - not really much difference at altitude compared to sea level, which makes it a LOT easier to drive. Sure, I still downshift on the steeper climbs, but can go up at partial throttle and it sure seems that I'm burning a LOT less gas in the process.
I can't say that the fuel injection system really increases power at sea level, but it sure starts easier and passes emissions with ease (so did my carb though).
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
|
|
|
|
| Re: Horse power.... [message #348789 is a reply to message #348760] |
Tue, 01 October 2019 14:37 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
Once I got the cooling straightened out, my 23' with stock (3.07) gears pulled Cowee Mountain S of Sylva NC both ways with the toad on back without a problem. Walked over Monteagle, 45 per in S. My 26' has 3.7 gears and with the toad on back and the Jasper motor would spin the wheels on takeoff although that motor had a lot of cam it didn't need and consequently really chitty mileage until it broke the cranklshaft.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
|
|
|
|
|
|
| Re: [GMCnet] Horse power.... [message #348792 is a reply to message #348791] |
Tue, 01 October 2019 15:04 |
Will Albers
Messages: 183
Registered: November 2017
Location: Detroit MI (Belleville)
Karma: 2
|
Senior Member |
|
|
If there is someone out there in the rare situation that they have a 3.7,
but wish they had a 3.5... I have a 3.5 that i have not yet installed into
my 26'. I would swap if it helps. 3.5, 3.7... both are better than the
3.07! Its a win for me no matter which one goes in.
-Will
On Tue, Oct 1, 2019 at 3:59 PM Matt Colie via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Those that know me know that I was an engine professional in OE land for
> many years. I also did other things....
>
> Last year I had to "refresh" my engine. I put in the cam by number that
> Dick Paterson recommended. It is much better than it was, but it is still
> cruising below the torque peak at 60 MPH. That is undesirable. It is
> still actually more comfortable with 70MPH, but both I and fuel rate are
> less
> comfortable. If I had the loose change, I would go to a 3.55 in a
> heartbeat. But again, this is with a different cam and a VERY LIGHT
> (9460#) coach.
>
>
> If I had any 26' anything, I would put a 3.70 in it at the earliest
> convenience.
>
> Matt
> --
> Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan
> OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Twixt A2 and Detroit
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
1978 Palm Beach.
Detroit Michigan
|
|
|
|
| Re: Horse power.... [message #348795 is a reply to message #348760] |
Tue, 01 October 2019 16:26 |
6cuda6
Messages: 975
Registered: June 2019
Karma: -6
|
Senior Member |
|
|
So did everyone do a crown gear and pinion swap or did they change the gears and chain?
Rich Mondor,
Brockville, ON
77 Hughes 2600
|
|
|
|
| Re: Horse power.... [message #348796 is a reply to message #348760] |
Tue, 01 October 2019 16:35 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
|
Senior Member |
|
|
Don't use 4.10 in a muscle car with shorter 14-15" wheels and 60 series tires for comparison. We have usually 16" with 75 series tires.
Also the chain sprocket swap multiplies torque before the transmission clutches and hard parts. The final drive swap lightens the torque load on the trans.
I'm happy with my USA 3.42 gears overall. Above 6% grade the 3.70 would be better but then not as good at 70 and above.
John Lebetski
Woodstock, IL
77 Eleganza II
|
|
|
|
| Re: Horse power.... [message #348798 is a reply to message #348760] |
Tue, 01 October 2019 16:49 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
|
Senior Member |
|
|
If "it's a sled" on the hills something is wrong. Even with 3.07 you can just grab S or L though sooner than with higher number final. Throttle cable not pulling fulling is almost a given. Stuck advance if never serviced is another given. Secondary lockout stuck due to gum or choke malfunction also a possibility
John Lebetski
Woodstock, IL
77 Eleganza II
|
|
|
|
| Re: Horse power.... [message #348799 is a reply to message #348760] |
Tue, 01 October 2019 16:59 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
|
Senior Member |
|
|
Boosted induction is a good way to make (restore) power at altitude. You have to be careful with heat though. Boost in cars is usually used for short blasts, passing, merging etc. A long grade for 15 mins is a different story. You need a systems approach not just an add-on.
John Lebetski
Woodstock, IL
77 Eleganza II
|
|
|
|
Goto Forum:
Current Time: Fri Sep 06 11:54:11 CDT 2024
Total time taken to generate the page: 0.01216 seconds
|
GMCforum
Search
Help
Register
Login
Home
