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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 03-20-2012, 11:56 AM   #21 (permalink)
94C1500
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I think the problem may have been the torque converter. The TCC solenoidis often an issue in our trucks, and not too difficult to replace, especailly if already pulling the pan. You can actually get all the electronics for the tranny for $140 in a kit. The TCC and PCS (force motor) are like the biggest wear items on the 4L80E, so makes sense to swap them when in there.

That and boost should be a little higher.

I have some ideas, will get in touch with you later.

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Old 03-20-2012, 12:02 PM   #22 (permalink)
94C1500
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Quote:
Originally Posted by 4thesporty View Post
Thanks guys.

I am running 265/75/16 Goodyear Wrangler Duratracs and my tach is correct now that I changed the alternator a couple of weeks ago and verified with GMTD Scantech. (I know that scantech and dash tach get the signal from the same place, but, you know)
The PCM and tach actually get RPM from differnt places, so that is a good verification.

With 3.73 gears you should have been alright, and the TCC should have been more than happy to stay locked at RPMs over 2000. Shorter tires do help to transfer more power to the ground, so 245 or 235 width tires would help a little, but will bring cruising RPMs up.

And dont underestimate the power difference with a better turbo. The GM turbo gets worse as RPMs increase. It makes a HUGE differnce.

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1994 C1500 - 4L80E & 3.42 rear; Custom Multi-Program Chip; L65 intake; "FTB", Walbro FRC-10 lift pump, pre-LP fuel filter & OPS relay mod; D-Tech FSD on heatsink; Big Turbo, 4" to 5" exhaust exits before axle, Cone air filter; "marine" injectors. Propane fumigation and WMI.
ENGINE DESIGN CALCULATORS
LIST OF RECOMMENDED MNX & MODS
HX40 or HX35 V-Band Exhaust Elbows
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Old 03-20-2012, 12:15 PM   #23 (permalink)
oldblacksmoker
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I was thinking of swapping my rear from a 4:11 to a 3:73, but that may be the big difference. I really think the headwind is your major factor. Go drive it on a calm day, and tell us the difference.
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Old 03-20-2012, 12:16 PM   #24 (permalink)
oldblacksmoker
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It also would be helpful to have another member with the 6.5 pull your trailer. That would be a good comparison. I know I've pulled "a great deal more" and only run slow to take care of my truck. It can get up to speed if I push it.
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Old 03-20-2012, 12:19 PM   #25 (permalink)
4thesporty
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Quote:
Originally Posted by oldblacksmoker View Post
I really think the headwind is your major factor. Go drive it on a calm day, and tell us the difference.

Yup, headwind does suck.

And, I already have many camping trips lined up for the next few months, some short distance, some longer. I'll keep this thread going and share my experiences of towing this sail behind the 6.5.
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Old 03-20-2012, 12:20 PM   #26 (permalink)
4thesporty
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Quote:
Originally Posted by 94C1500 View Post
The PCM and tach actually get RPM from differnt places, so that is a good verification.

.

Thanks for the correction, learn something new everyday
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1994 Chevy K3500 4x4 Crew Cab SRW 212,000 miles
-SOLD 05-08-15
HX40WII Turbo
-4" Turbo Back DE Exhaust
-FTB upgrade with SS -6an line from tank to IP
-Walbro FRB-5 LP with pre and post Wix Filters
-New Bosch Injectors (2200 psi)/Duraterm GPs
-Buddy's single tow tune
-RCD 6" lift kit
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Old 03-20-2012, 01:05 PM   #27 (permalink)
Tommygunner
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I have my doubts about those multi tune chips. I have used them in gassers and been less than pleased with the results. The one i tried in a 350 TBI Blazer worked good unloaded. But put some weight on the back it and it towed worse than the stock chip. Ended up getting a custom chip burned fo my truck.
Try putting your stock chip back in and see what happens. You may see an improvement.
I have heard the guy who makes those Buddy's chips will work with you to get the tune right. Might want to contact him.
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1998 GMC K1500 WT, 6.5 TD. 80,000 miles. Auto, 3.73 gears. Remote PMD mounted on the radiator support. KOJO tune WOW! Carter HD lift pump. Feed the beast, GM8 turbo with Hurricane impeller. K&N filter. Ported, gasket matched upper intake. Leroy's braded stainless steel oil lines.
New Bosch injectors. Flow matched 2200 lbs pop
3 1/2" custom Aero turbine exhaust. Nutered Cat
2" Lift RS5000 Shocks. 285 X 17 Bridgestone AT summer tires. 12.50 x 33 x 15 Procomp MTs winter. Powertrax No slip locker in rear.

Last edited by Tommygunner; 03-20-2012 at 01:15 PM.
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Old 03-20-2012, 01:14 PM   #28 (permalink)
oldblacksmoker
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Quote:
Originally Posted by Tommygunner View Post
I have my doubts about those multi tune chips. I have used them in gassers and been less than pleased with the results. The one i tried in a 350 TBI Blazer worked good unloaded. But put some weight on the back it and it towed worse than the stock chip. Ended up getting a custom chip burned fo my truck.
Try putting your stock chip back in and see what happens. You may see an improvement.
This is the multi-tune he is talking about. It's the best out there. No way it would be better stock.
http://www.ebay.com/itm/6-5-Turbo-Di...#ht_5553wt_256
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Old 03-20-2012, 01:19 PM   #29 (permalink)
oldblacksmoker
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@4thesporty I think you're faced with the same problem I have. My 4:11 gears make for great towing, but I only get about 14 mpg empty. Loaded I pull ridiculous loads and get about 12 mpg. I want the better fuel economy, but I can really haul. Wish I had a gear vendor to have the best of both worlds. Ultimately, unless you want to spend 30-60 thousand for a nice new truck, you just have to deal with limitation. I will say that my truck is probably the most comfortable vehicle to ride in of any vehicle I know of, and I've driven just about everything. So, until something better drops into my lap, I'm satisfied.
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Old 03-20-2012, 01:21 PM   #30 (permalink)
Tommygunner
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Yes i know about the Buddys chip. Its a pretty new product. Not that many have been sold.
How do you know it is the best out there? Has it been compaired to Heath, Westers, KOJO, ECT
All i am saying is for the op to try towing the trailer with his stock chip to see what happens. Simple little test to establish a base line.
Sounds to me the engine may be de-fueling under heavy load. Or possibly a timing issue.

__________________
The beauty of the Second Amendment is that it will not be needed until they try to take it

If Americans ever allow banks to control their currency. First by deflation then inflation. The banks will deprive the people of all property. Until their children wake up homeless.
1998 GMC K1500 WT, 6.5 TD. 80,000 miles. Auto, 3.73 gears. Remote PMD mounted on the radiator support. KOJO tune WOW! Carter HD lift pump. Feed the beast, GM8 turbo with Hurricane impeller. K&N filter. Ported, gasket matched upper intake. Leroy's braded stainless steel oil lines.
New Bosch injectors. Flow matched 2200 lbs pop
3 1/2" custom Aero turbine exhaust. Nutered Cat
2" Lift RS5000 Shocks. 285 X 17 Bridgestone AT summer tires. 12.50 x 33 x 15 Procomp MTs winter. Powertrax No slip locker in rear.

Last edited by Tommygunner; 03-20-2012 at 01:33 PM.
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