LLY Virgin w/EGT problem

1441 Views 15 Replies 9 Participants Last post by BlackMax05, Jan 21, 2007

BlackMax05

Discussion Starter · Jan 19, 2007

I am new to the diesel world and bought a 05 2500HD with 91K mi. due to cash flow problems. I have been told this motor is good well over 200K

prompting the purchase. I got sick of you guys blowing buy me on every hill in my gas truck.

The issue is while towing my aprox 13K trailer on even the slightest grade the EGT will almost instantly reach 1200+

if I dont back out of the throttle. The truck came with Banks 4" cat back & 6 Gun with PDA, that I am only partial to due to the versatility of the PDA for monotering temps rather than guages on the A piller. I have only towed in level 1 or 2 to date with the same result. I have talked to Banks tech RBP etc. and all have different theory's from the 6 gun is faulty, the turbo has an air leak or the injectors are bad. I need help finding a honest resonablly priced teck that can diagnose my problem in or around Orange County California. I hope someone can help? Any advise will be greatly appreciated.

1 - 16 of 16 Posts

RickDLance

· #2 · Jan 19, 2007

The LLY's EGT's are hotter then most would like them. I have seen 1400+ with one of mine stock.

rsnewton

· #3 · Jan 19, 2007

I hit 1250 - 1300 easy towing 8k up hill and I never tow over 60 mph on flat ground and slower on a grade. I'm moving up to a 14k 5er soon and I'm a little nervous.

RickDLance

· #4 · Jan 19, 2007

If I've read your post correctly you still have the cat on?

Also a Boost Stick may help.

D Lafleur

· #5 · Jan 19, 2007

BlackMax, My rule of thumb is too minimize all time above 1400 and try not to sustain above 1300 for extended periods of time. I do know that sustained temps above 1600 will cook the turbo.

BlackMax05

Discussion Starter · #6 · Jan 19, 2007

Yes cat is still in place.

BlackMax05

Discussion Starter · #7 · Jan 19, 2007

I was told of a Powerstroke owner who burned holes in his pistons with Banks and he never ran above 1200. Is the Duramax capable of higher sustaned temps?

Big Pull Mike

· #8 · Jan 19, 2007

07-08-2006, 08:54 PM § #7
McRat
Supporting Vendor

Join Date: Jan 2004
Location: Corona, California
Posts: 7,678

GM says 1425 for less than 5 minutes, and 1350 sustained, IIRC. Many of us have hundreds of 1/4mi passes over 1600 deg though. A 1/4 mi pass gets the EGT's over 1600 for about 6 seconds or less. The charger parts take awhile to absorb the heat. If you sustained 1600 for a minute or more, I imagine it would start to damage the charger.
__________________
2005 GMC 2500HD LLY "Casper" - 11.770 @ 114.56 on #2. 674rwhp/1380ftlb on Diesel Only. EFILive "2CP3" Tuning, Mike L Suncoast Trans, PPE Dual CP3's, "McRat Special" HTT turbo.
2004.5 GMC 3500 SRW LLY "Big Blue" - [email protected] Powered by PPE/VA with Mike L Suncoast Trans.
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i read this a while back so 1350 to 1400 don't bother me anymore

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BudTX

· #9 · Jan 19, 2007

I agree wtih Rick. A 4" catless exhaust will make a difference.

Bodysurfer

· #10 · Jan 19, 2007

For another choice, you could always hit up member SoCalDieselTech who runs Red Line Diesel Performance .

Many members in the VENDORS section: http://www.dieselplace.com/forum/showvendors.php?

sparkyss

· #11 · Jan 19, 2007

BlackMax05;1536827; said:
I am new to the diesel world and bought a 05 2500HD with 91K mi. due to cash flow problems. I have been told this motor is good well over 200K prompting the purchase. I got sick of you guys blowing buy me on every hill in my gas truck. The issue is while towing my aprox 13K trailer on even the slightest grade the EGT will almost instantly reach 1200+ if I dont back out of the throttle. The truck came with Banks 4" cat back & 6 Gun with PDA, that I am only partial to due to the versatility of the PDA for monotering temps rather than guages on the A piller. I have only towed in level 1 or 2 to date with the same result. I have talked to Banks tech RBP etc. and all have different theory's from the 6 gun is faulty, the turbo has an air leak or the injectors are bad. I need help finding a honest resonablly priced teck that can diagnose my problem in or around Orange County California. I hope someone can help? Any advise will be greatly appreciated.

Level 1 on the Banks is stock tune. No power is added at that point. I personally have towed as high as level 4 w/ a 10k trailer and averaged EGT's around the 1300* mark, but I also have the full set-up. I would suggest resetting the parameters on the PDA back to stock just to make sure that the previous owner didn't screw with the settings. It is possible to make adjustments to all the power settings from stock.
Just as a point of reference Level 1-Stock, Level 2-20hp, Level 3-40hp, Level 4-60hp, Level 5-80hp, Level 6-100hp and SL or Speed Loader 120+hp.

Aaron71

· #12 · Jan 21, 2007

Hopefully this will give you a little something. I Own a 2004.5 LLY GMC with a 118,000 miles on it. These are the modifications I've done AFE Stage II Pro-Gard 7 cold air intake, Silverline T-304 exhaust single 4" with 5" tip Turbo back, Dr. Performance Nitro Flash tuner 80hp/200ft lbs, BD exhaust Manifold, Amsoil 15-40 full synthetic, and Autometer Elite series Pyro and Boost gauge. Here are some comparison to check for yourself. I was about 11,500 to 12,000 lbs with camper and boat on my truck weekend after Labor Day 2006. We were traveling 72 in overdrive up a 5-6% grade with the air temperature 81. The pryo was 1125-1150, Transmission 190, Engine 210 for 5-7 miles. These temperatures with the cat in place. It dropped another 75-100 with the Cat out up that same grade.

Aaron71

· #13 · Jan 21, 2007

Something else to think about also these EGT temps on my 2004.5 are right in the Exhaust manifold not after the turbo on the downpipe. The techs I've talked to say there can be about 200-250 temperature decrease after the turbo port. I never had to add either a fingerstick or a blocker plate my truck to not code a air flow problem after taking the cat out. The exhaust manufacturer along with other techs claim that only about 10-30 of the LLY diesels would since the cat out. Or perhaps it was addition of the BD exhaust manifold the hp addition of the flashtuner that still make enough back pressure to not set a DTC code.

sparkyss

· #14 · Jan 21, 2007

Aaron71;1539921; said:
I never had to add either a fingerstick or a blocker plate my truck to not code a air flow problem after taking the cat out. The exhaust manufacturer along with other techs claim that only about 10-30 of the LLY diesels would since the cat out. Or perhaps it was addition of the BD exhaust manifold the hp addition of the flashtuner that still make enough back pressure to not set a DTC code.

If your truck came with Federal Emissions rating, then it won't set a code anyway.

RickDLance

· #15 · Jan 21, 2007

All of mine set the code without the cat. They just don't turn on the CEL.

BlackMax05

Discussion Starter · #16 · Jan 21, 2007

Thank's for the input. I have been asking anyone I see also and the question of how much boost I was seeing was asked multiple times. How much should I be seeing unloaded and towing? I also have read in another trread that the turbo is variable vein, what is this?

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