Home » Public Forums » GMCnet » Trip Report: Boise to Toledo with the Manny 6.5TD conversion
| Trip Report: Boise to Toledo with the Manny 6.5TD conversion [message #343940] |
Wed, 05 June 2019 10:08  |
xplorid
Messages: 213
Registered: February 2012
Location: Boise
Karma: 0
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Boise to Henry's Lake (ID), crawl thru Yellowstone, up and over the Bighorns to Sheridan and I-90, then lost the fuel pump near Gillette WY. Spent the next day fixing that (thanks Platinum Diesel Service!) and the sewer pipe that the tow driver broke. Stop in the Black Hills, then across SD, MN, WI, IL, IN, and into Toledo OH.
Just about 2000 miles, 75-80mph whenever I could, about 13mpg, exactly what Bill Hubler told me to expect with the diesel.
Now in Toledo for a week or so, anybody in the area give me a shout while I am here.
I need an alignment check and tire rotation if anybody has a competent shop in NW Ohio - SE Michigan, and I need dash AC service before I head back.
Great trip so far, and really pleased with the diesel performance. With a 2.73 or 2.76 (cannot recall, but gearing out of an Eldorado) final drive it's a slug off the line, but really wakes up on the road. Not noisy, not smelly unless you spill diesel fuel (I did of course). No vapor lock, no overheating in slow or stopped traffic (like in Yellowstone), and the coach ran stronger after the fuel pump replacement, so that had likely been weeping for a while.
See the USA...
Jeff
1974/94 GMCII by Explorer
Manny 6.5 TD Al radiator
1 ton front 4 bags back
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| Re: Trip Report: Boise to Toledo with the Manny 6.5TD conversion [message #343942 is a reply to message #343940] |
Wed, 05 June 2019 11:27  |
Russell K.
Messages: 178
Registered: October 2016
Location: Dunedin, Florida
Karma: 4
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Jeff,
Its good to hear that the diesel is performing well. How are your tranny temps running with the diesel and the 2.73 final drive? How big is your transmission cooler? Is Cinnabar in Sandusky close enough to you for the work you need done? I hope you share some pictures from your trip.
Safe Travels.
Russell
1978 Eleganza II, Dunedin, Florida
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| Re: Trip Report: Boise to Toledo with the Manny 6.5TD conversion [message #343947 is a reply to message #343942] |
Wed, 05 June 2019 14:02 |
xplorid
Messages: 213
Registered: February 2012
Location: Boise
Karma: 0
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Senior Member |
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Thanks for the note Russell. Sandusky is not far, thanks for that reminder. Transmission cooler is from Manny, I think a bit bigger than the one on the Applied website but not sure. Trans temps? No idea - I do not have a gauge and with the tranny turning that slowly in this setup it is not a primary concern, but really might be good to compare to others so I'll put trans temp gauge on the list, just not first.
Ahh Toledo - clouds, humidity, mosquitoes - just like I remember it. Actually, a great place to be from.
Jeff
1974/94 GMCII by Explorer
Manny 6.5 TD Al radiator
1 ton front 4 bags back
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| Re: Trip Report: Boise to Toledo with the Manny 6.5TD conversion [message #343949 is a reply to message #343940] |
Wed, 05 June 2019 14:20 |
lqqkatjon
Messages: 2324
Registered: October 2010
Location: St. Cloud, MN
Karma: 5
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Senior Member |
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Chances are you will stay south on your return trip on I-90 through MN and SD.
if some chance you take I-94 north route through MN/ North Dakota, I am off MN I-94 exit 174 about 4 minutes. If you need any DIY A/C work done at that time. I am no pro, but I have vacuum pump, gauges, duracool and r-134 on hand.
Jon Roche
75 palm beach
EBL EFI, manny headers, Micro Level, rebuilt most of coach now.
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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| Re: Trip Report: Boise to Toledo with the Manny 6.5TD conversion [message #343950 is a reply to message #343940] |
Wed, 05 June 2019 16:33 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
Karma: 4
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Very cool !!
13 mpg. That double from what I get. Awesome!!
I had a 1992 hummer with the 6.2 diesel. 1 also got 13 mpg, that was doing 70 mph or at idle. Didn't seem to matter.
The tranny cooler was the size of a radiator,
Scott.
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
[Updated on: Wed, 05 June 2019 16:36] Report message to a moderator |
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| Re: [GMCnet] Trip Report: Boise to Toledo with the Manny 6.5TD conversion [message #343960 is a reply to message #343950] |
Thu, 06 June 2019 02:46 |
johnd01
Messages: 354
Registered: July 2017
Location: Sacrameot
Karma: -1
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What is engine RPM at 80 MPH? Does the Diesel like to run that fast?
On Wed, Jun 5, 2019 at 3:20 PM Scott Nutter via Gmclist <
gmclist@list.gmcnet.org> wrote:
> Very cool !!
> 13 mpg. That double from what I get. Awesome!!
> I had a 1992 hummer with the 6.2 diesel. 1 also got 13 mpg, that was doing
> 70 mph or at idle. Didn't seem to matter.
> Scott.
> --
> Scott Nutter
> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final
> drive, Quad bags, tankless water heater, everything Lenzi. Alex Ferrera
> installed MSD Atomic EFI
> Houston, Texas
>
> _______________________________________________
> GMCnet mailing list
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--
*John Phillips*
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Johnd01
John Phillips
Avion A2600 TZE064V101164
Rancho Cordova, CA (Sacramento)
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| Re: [GMCnet] Trip Report: Boise to Toledo with the Manny 6.5TD conversion [message #343961 is a reply to message #343960] |
Thu, 06 June 2019 04:14 |
xplorid
Messages: 213
Registered: February 2012
Location: Boise
Karma: 0
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No tachometer on this coach so no idea of RPM at 80mph but someone here on the forum may do the math for us with a 2.73 differential ratio.
As I reported to Manny, the diesel seemed to love running 70-80 and with no cruise control (yet) it took some attention to keep it down. That may have been different had I not been driving solo. Most of the trip across the plains included a crosswind out of the north but no headwinds, the coach itself did not feel like it was struggling and I likely surprised a few drivers as they were passed by a 45 year old motorhome.
Jeff
1974/94 GMCII by Explorer
Manny 6.5 TD Al radiator
1 ton front 4 bags back
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| Re: [GMCnet] Trip Report: Boise to Toledo with the Manny 6.5TD conversion [message #343963 is a reply to message #343961] |
Thu, 06 June 2019 07:48 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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xplorid wrote on Thu, 06 June 2019 05:14No tachometer on this coach so no idea of RPM at 80mph but someone here on the forum may do the math for us with a 2.73 differential ratio.
As I reported to Manny, the diesel seemed to love running 70-80 and with no cruise control (yet) it took some attention to keep it down. That may have been different had I not been driving solo. Most of the trip across the plains included a crosswind out of the north but no headwinds, the coach itself did not feel like it was struggling and I likely surprised a few drivers as they were passed by a 45 year old motorhome.
Jeff
Jeff,
You have a cruise control, you just don't know it.....
Hold the "Gas Peddle" in one place, and you have it (with some small designed in droop).
All diesel engines have to have a speed controlling system built into the fuel injection system. As they do not have a carburetor to strangle them when they try to go faster, with the positive feedback of the torque curve they would be very difficult to drive were it not for that feature. I could be boring and go on for another few pages that were all about diesel fuel control, but I have other things to do and people to annoy.
Matt - Not looking forward to pulling the front frame out AGAIN!
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Trip Report: Boise to Toledo with the Manny 6.5TD conversion [message #343978 is a reply to message #343963] |
Thu, 06 June 2019 12:17 |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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You should be @ about 2600 rpm if you are running 225x75x16 tires at 80. The 6.5 makes max torque in the 1800 rpm range and is governed @ 3400 rpm. If you're getting 13 at 80 mph you must be running on pretty flat ground without unfavorable winds. Slow it down to the 2000< rpm and see what your mileage does, you'll like it. The lower rpm will also quiet things down in the cab considerably. All things equal, diesel should see about 30% improvement in economy, there's no magic there just more energy content in the fuel.
25,000+ miles on ours and most satisfied, but I'm a die hard diesel guy.
Have a Duramax and 6sp Allison in the shop now with ideas maybe for the future....
Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
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| Re: [GMCnet] Trip Report: Boise to Toledo with the Manny 6.5TD conversion [message #343984 is a reply to message #343978] |
Thu, 06 June 2019 14:36 |
xplorid
Messages: 213
Registered: February 2012
Location: Boise
Karma: 0
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Senior Member |
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What a great interest group. Thanks for the notes...I did not do 80mph all the way, but found the coach at that speed quite a few times and had to back off, and the mileage estimate is just that. It would be great to know what this thing does for mileage at 65 with no winds. Not sure I will ever find out, but it would be an interesting benchmark. Mileage was not the primary motivator for the diesel conversion, but FWIW it moves this 12,000 pounds very nicely with the TH425, a 4+ speed transmission would be another leap forward, for all of us.
Jeff
1974/94 GMCII by Explorer
Manny 6.5 TD Al radiator
1 ton front 4 bags back
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| Re: [GMCnet] Trip Report: Boise to Toledo with the Manny 6.5TD conversion [message #343985 is a reply to message #343978] |
Thu, 06 June 2019 15:12 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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Hal:
What’s the HP and Torque numbers on your diesel?
Also, is the transmission a 3, 4, 5 or 6?
Mostly curiosity.
Dolph
DE AD0LF
Wheeling, West Virginia
1977 26’ ex-PalmBeach
Howell EFI & EBL, Reaction Arms, Manny Transmission
“The Aluminum and Fiberglass Mistress"
> On Jun 6, 2019, at 1:17 PM, Hal StClair via Gmclist wrote:
>
> You should be @ about 2600 rpm if you are running 225x75x16 tires at 80. The 6.5 makes max torque in the 1800 rpm range and is governed @ 3400 rpm. If
> you're getting 13 at 80 mph you must be running on pretty flat ground without unfavorable winds. Slow it down to the 2000< rpm and see what your
> mileage does, you'll like it. The lower rpm will also quiet things down in the cab considerably. All things equal, diesel should see about 30%
> improvement in economy, there's no magic there just more energy content in the fuel.
> 25,000+ miles on ours and most satisfied, but I'm a die hard diesel guy.
> Have a Duramax and 6sp Allison in the shop now with ideas maybe for the future....
> Hal
>
> --
> 1977 Royale 101348,
>
> 1977 Royale 101586, Diesel powered,
>
> 1975 Eleganza II, 101230,
>
> 1974 Eagle Bus 45',w/slideout,
>
> Rio Rancho, NM
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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| Re: [GMCnet] Trip Report: Boise to Toledo with the Manny 6.5TD conversion [message #343986 is a reply to message #343985] |
Thu, 06 June 2019 15:59 |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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Senior Member |
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Dolph, The motor was rated 194 hp, 430 tq in stock form. I installed a Charge air cooler and had the ECM flashed to allow more boost/fuel. I've gone from a stock 7 or 8 lbs to 13 to 15 although I try to keep it under 14. The stock programming would pull boost after about 12 seconds because of EGT's but with a CAC I don't have that issue. In reality, I'm probably in the 240/250 hp range but the tq is most likely at or near 500. There are a few other things like a straight through 3 1/2" exhaust (still nice and quiet), nice cool air from in front of the cooling stack that help. I'm running the 4l80e trans which is a 4 speed with locking converter. Final drive works out to a 2.76 but you don't have the ordinary 3% converter slip. Of course I chose to run it with GM's electronics which shift the trans at the perfect times and as a side benefit self diagnose most any problem. I've been very happy with the results, but as I stated, I've always been a Diesel guy.
Hal
Dolph Santorine wrote on Thu, 06 June 2019 14:12Hal:
What's the HP and Torque numbers on your diesel?
Also, is the transmission a 3, 4, 5 or 6?
Mostly curiosity.
Dolph
DE AD0LF
Wheeling, West Virginia
1977 26' ex-PalmBeach
Howell EFI & EBL, Reaction Arms, Manny Transmission
"The Aluminum and Fiberglass Mistress"
> On Jun 6, 2019, at 1:17 PM, Hal StClair via Gmclist wrote:
>
> You should be @ about 2600 rpm if you are running 225x75x16 tires at 80. The 6.5 makes max torque in the 1800 rpm range and is governed @ 3400 rpm. If
> you're getting 13 at 80 mph you must be running on pretty flat ground without unfavorable winds. Slow it down to the 2000< rpm and see what your
> mileage does, you'll like it. The lower rpm will also quiet things down in the cab considerably. All things equal, diesel should see about 30%
> improvement in economy, there's no magic there just more energy content in the fuel.
> 25,000+ miles on ours and most satisfied, but I'm a die hard diesel guy.
> Have a Duramax and 6sp Allison in the shop now with ideas maybe for the future....
> Hal
>
> --
> 1977 Royale 101348,
>
> 1977 Royale 101586, Diesel powered,
>
> 1975 Eleganza II, 101230,
>
> 1974 Eagle Bus 45',w/slideout,
>
> Rio Rancho, NM
>
> _______________________________________________
> 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
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
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