Home » Public Forums » GMCnet » [GMCnet] Trip Report Anza-Moab-Anza
| [GMCnet] Trip Report Anza-Moab-Anza [message #24669] |
Wed, 15 October 2008 09:48  |
Gary Worobec
Messages: 867
Registered: May 2005
Karma: -1
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Hi,
Just got back from 10 days on the road. We went from Anza in SoCal to Las
Vegas, then to Hurricane, Utah then to Moab, Utah, then to Flagstaff,AZ and
then home. About 1500 miles. Primary visitations were Zion National Park,
Arches National Park, Canyonlands and some off roading in Moab. The coach
ran very well. The change to Mobil 15-50 Synthetic seemed to give another 2
lbs of oil pressure from 42 to 44 on the SW mechanical gauge at 2500 RPM.
Seemed about 5 lbs higher at hot idle from 22 to 27 lbs. ???. We towed the
Tracker plus I had my Yamaha TW200 on a rear rack on the coach. A fairly
heavy load. Mileage was between 8-10 mpg. Gas in Utah was about $3.60 a
gallon but in AZ down to $3.12 in some places. The new A/C worked very well
although I had to adjust the belt in Moab. Can't say enough about the
aluminum radiator and HD fan clutch from Jim K. Amazing performance on some
pretty big hills.
I'm on the fence though about going to a lower final drive ratio. I'm able
to cruise at 65-70 at 2500 rpm with the 3:07 and if I get to a hill just
drop it into second gear. My sweet spot is about 2600 rpm for max torque. It
just pulls like a son of a gun at that rpm. Also, I'm thinking the new
Howell FI that I have in the box in my office just could become a very
expensive door stop as the Q-jet is running flawlessly even at 7,000 ft. Go
figure!!!!
Thanks,
Gary and Joanne Worobec
Anza, CA
1973 23' Glacier
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| Re: [GMCnet] Trip Report Anza-Moab-Anza [message #24692 is a reply to message #24669] |
Wed, 15 October 2008 11:52  |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Gary, I'm glad to hear you had a good trip.
You'll notice the differance when you go with the 3.55/3.70.
On Wed, Oct 15, 2008 at 7:48 AM, Gary Worobec <gtw5@earthlink.net> wrote:
> Hi,
> Just got back from 10 days on the road. We went from Anza in SoCal to Las
> Vegas, then to Hurricane, Utah then to Moab, Utah, then to Flagstaff,AZ and
> then home. About 1500 miles. Primary visitations were Zion National Park,
> Arches National Park, Canyonlands and some off roading in Moab. The coach
> ran very well. The change to Mobil 15-50 Synthetic seemed to give another 2
> lbs of oil pressure from 42 to 44 on the SW mechanical gauge at 2500 RPM.
> Seemed about 5 lbs higher at hot idle from 22 to 27 lbs. ???. We towed the
> Tracker plus I had my Yamaha TW200 on a rear rack on the coach. A fairly
> heavy load. Mileage was between 8-10 mpg. Gas in Utah was about $3.60 a
> gallon but in AZ down to $3.12 in some places. The new A/C worked very well
> although I had to adjust the belt in Moab. Can't say enough about the
> aluminum radiator and HD fan clutch from Jim K. Amazing performance on some
> pretty big hills.
>
> I'm on the fence though about going to a lower final drive ratio. I'm able
> to cruise at 65-70 at 2500 rpm with the 3:07 and if I get to a hill just
> drop it into second gear. My sweet spot is about 2600 rpm for max torque.
> It
> just pulls like a son of a gun at that rpm. Also, I'm thinking the new
> Howell FI that I have in the box in my office just could become a very
> expensive door stop as the Q-jet is running flawlessly even at 7,000 ft. Go
> figure!!!!
>
> Thanks,
>
> Gary and Joanne Worobec
> Anza, CA
> 1973 23' Glacier
>
>
> _______________________________________________
> GMCnet mailing list
> Gmclist@temp.gmcnet.org
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Trip Report Anza-Moab-Anza [message #24885 is a reply to message #24880] |
Thu, 16 October 2008 22:01 |
Gary Worobec
Messages: 867
Registered: May 2005
Karma: -1
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Senior Member |
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Hi Bob,
Yes, I tend to agree with you. Not sure why everyone is so high on the lower
ratios.
Thanks,
Gary and Joanne Worobec
Anza, CA
1973 23' Glacier
----- Original Message -----
From: "Bob Nuttmann" <bbnuttmann@cox.net>
To: <gmclist@temp.gmcnet.org>
Sent: Thursday, October 16, 2008 7:08 PM
Subject: Re: [GMCnet] Trip Report Anza-Moab-Anza
>
>
> Gary,
>
> My GMC is stored quite close to you now. I have a building in Temecula
> and the 75 Glenbrook is kept inside.
>
> By accident I forgot about the final drive ratio when I replaced my
> transmission about a year and a half ago. My coach used to have 343 or
> something close to that. So when I had a rebuilt Manny transmission put
> in it came with a standard 307 final drive (You can't call it a rear end
> like I would normally do.). I like the 307 better than the higher ratio.
> It gets a little better gas mileage, runs quieter, and still climbs hills
> fine. I do not ever tow anything though so my GMC not taxed too much.
>
> Bob Nuttmann
> --
> Bob Nuttmann
> 1975 Glenbrook 26'
> Jamul, CA
> _______________________________________________
> GMCnet mailing list
> Gmclist@temp.gmcnet.org
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Trip Report Anza-Moab-Anza [message #24896 is a reply to message #24885] |
Fri, 17 October 2008 07:46 |
Carleton Douglas[1]
Messages: 174
Registered: March 2006
Karma: 0
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If you were going to buy a new pick-up to tow a 5th wheel the factory
requires rear end ratios of 3.70 or 4.10 now we are driving with 10 to
12k all the time. I think that the factory has more engineering data
on what it takes to do the work required by a truck than we do. Food
for thought
On Thu, Oct 16, 2008 at 8:01 PM, Gary Worobec <gtw5@earthlink.net> wrote:
> Hi Bob,
> Yes, I tend to agree with you. Not sure why everyone is so high on the lower
> ratios.
>
> Thanks,
>
> Gary and Joanne Worobec
> Anza, CA
> 1973 23' Glacier
>
>
> ----- Original Message -----
> From: "Bob Nuttmann" <bbnuttmann@cox.net>
> To: <gmclist@temp.gmcnet.org>
> Sent: Thursday, October 16, 2008 7:08 PM
> Subject: Re: [GMCnet] Trip Report Anza-Moab-Anza
>
>
>>
>>
>> Gary,
>>
>> My GMC is stored quite close to you now. I have a building in Temecula
>> and the 75 Glenbrook is kept inside.
>>
>> By accident I forgot about the final drive ratio when I replaced my
>> transmission about a year and a half ago. My coach used to have 343 or
>> something close to that. So when I had a rebuilt Manny transmission put
>> in it came with a standard 307 final drive (You can't call it a rear end
>> like I would normally do.). I like the 307 better than the higher ratio.
>> It gets a little better gas mileage, runs quieter, and still climbs hills
>> fine. I do not ever tow anything though so my GMC not taxed too much.
>>
>> Bob Nuttmann
>> --
>> Bob Nuttmann
>> 1975 Glenbrook 26'
>> Jamul, CA
>> _______________________________________________
>> GMCnet mailing list
>> Gmclist@temp.gmcnet.org
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> Gmclist@temp.gmcnet.org
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Carleton Douglas
73 custom, by myself
Prescott, AZ
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| Re: [GMCnet] Trip Report Anza-Moab-Anza [message #24988 is a reply to message #24669] |
Fri, 17 October 2008 23:17 |
rallymaster
Messages: 662
Registered: February 2004
Location: North Plains, ORYGUN
Karma: -4
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Senior Member |
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How about tire size???
225x75x16 or 235 somethings??
ron
On Fri, 17 Oct 2008 20:13:38 -0500 Roger Black <r1black@comcast.net>
writes:
> Jim,
> If you do 60-62 at 2400, I must have a different rear, er, front
> drive
> than a 3.07. At 65, I'm turning 2 grand on the tach. At 70, it's
>
> around 2500 if I remember correctly. Might just have to do some
> checking.
>
> Roger
> _______________________________________________
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>
Ron & Linda Clark
1978 Eleganza II
North Plains, ORYGUN
____________________________________________________________
Stuck in a dead end job?? Click to start living your dreams by earning an online degree.
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Ron & Linda Clark
North Plains, ORYGUN
78 Eleganza II
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| Re: [GMCnet] Trip Report Anza-Moab-Anza [message #24992 is a reply to message #24961] |
Fri, 17 October 2008 23:48 |
Rick Denney
Messages: 430
Registered: January 2004
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Roger Black writes...
> Jim,
> If you do 60-62 at 2400, I must have a different rear, er, front drive
> than a 3.07. At 65, I'm turning 2 grand on the tach. At 70, it's
> around 2500 if I remember correctly. Might just have to do some
> checking.
That's not right even for a 3.07. Standard tires run about 700
revolutions per mile. At 60 mph, that mile takes a minute. That's 700
revolutions of the wheel in a minute. Times 3.07, that should be 2150
RPMs, plus torque-converter slippage (maybe another 100 RPMs).
2400 at 60 mph is maybe a 3.42 final drive, if Jim has standard size
tires and his speedometer is correct. At those RPMs, a 3.07 should
push him along at 65. But if he's reading 62 on his speedometer, then
he may be going 65. That's exactly the inaccuracy of my speedometer,
as compared to GPS. Some precision is needed here.
I'm running about 2400 or 2500 RPMs running at 65 (true) with my 3.07.
Roger, if you're running at 2000 RPMs at 65, then you have a
2.something final drive. They did come in those ratios in Toros. But
if that was the case, it should only be 2150 at 70 mph. Engine RPMs
are linear with speed.
Rick "willing to bet all three of us have 3.07's" Denney
'73 230 Ex-Glacier "Jaws"
Northern Virginia
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| Re: [GMCnet] Gear ratios [message #24993 is a reply to message #24979] |
Fri, 17 October 2008 23:53 |
Rick Denney
Messages: 430
Registered: January 2004
Karma: 0
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Senior Member |
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Roger Black writes...
> Found this on the net:
A preferred formula is to use 700 revolutions per mile for standard
tires. At 60 mph (and this should be true 60 mph--my speed reads 5%
low), read the RPMs and divide by 700 if you have standard tires (the
number of tire revolutions per mile if you don't). That's your
effective final drive ratio. There's an error because of
torque-converter slippage, too.
Rick "who tries to run the engine at a mininum of 2000 RPMs,
especially under power" Denney
'73 230 Ex-Glacier "Jaws"
Northern Virginia
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| Re: [GMCnet] Gear ratios [message #24999 is a reply to message #24979] |
Sat, 18 October 2008 06:19 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Here's a chart that has been available for several years that may help.
http://www.gmceast.com/technical/Brown_Drive_Tire_Ratios.pdf
J.R. Wright
GMC GreatLaker
77 Eleganza Custom
1975 Avion Under Reconstruction
Michigan
> Found this on the net:
>
> These formulas are for giving you a good idea of what to expect not
> 100% accurate, but pretty close. Some things you need to remember is
> that if your tire is 25" standing still it will be taller at speed.
> How much depends on tire construction, rubber compound, inflation. It
> will be shorter on acceleration depending on engine power, wheel spin.
> Then you have tranny slippage and probably other small variables.
>
> To figure rpm:
> 168 * gear ratio * mph / tire radius
> To figure mph:
> tire radius / 168 * rpm / gear ratio
> To figure gear ratio:
> tire radius * rpm / 168 / mph
> To figure tire radius:
> 168 * mph * gear ratio / rpm
>
> Mine still figured out near 3.07
>
> Roger
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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