Engine/Transmission (1994 - 1998) Egt To High

[WadePatton]

Originally posted by Piston Slapper

After having run 14 and 16 cm housing on stock chargers and then running an aftermarket. I would skip the housings unless money was just a big issue, cause they do not help a whole lot, but do help some.

Yall have to remember that he is dealing with a SERIOUSLY overfueled truck (not the 24v in his sig). And that $$$ in NOT an big issue for that truck!

 

[Garry Verheyden]

Everyone exaggerates with how much egt. reduction is from this mod to that. I had the 12cm housing and went to the 16 housing in order to reduce egts. I probably lost about 75-100 degrees. My boost went from 44-45# to 35#. There was certainly more lag and smoke on the bottom end and cruising temps. went from about 575 degrees(empty) to about 625. If you are only hitting 35#boost now, I wouldnt go to a larger housing. 35# is probably perfect for your mods. One other mod. that I hadn't seen anyone talk about here was an ATS 3 piece manifold. I noticed almost as much egt. reduction with this as the larger housing(without increasing turbo lag and low end smoke) . It was good for a realistic 50-75 degrees. Although it is more money than a non wastgated housing.

I have towed a 15,000# 5th wheel for 4 yrs now and have pulled huge hills at 1400-1450 deg. for over 5 min. intervals many times . My truck has seen over 1800 deg. plenty of times for short 5-10 sec. bursts. I looked at the pistons and they were fine. I did have some hairline cracking on the head though. I wouldn't worry about towing at 1350 deg. ( post turbo) you can run the truck all day long at those temps.

 

[Joseph Donnelly]

Check for restrictive muffler, partially plugged catalytic converter, or loose boost clamps.

 

[Deezul1]

See my sig, I tow a 6500lb TT and the EGTs are not a problem unless I am up around 10,000 feet then I need to watch them a little closer. The lag from the 16cm housing is not very much at all compared to the 12cm but playing with the AFC adjustment helps that. When racing thats another story as then its full throttle through 4 gears gives a good chance to get hot. It seems like there is a difference in how these trucks respond to mods because what I have experienced is different than someone else and theirs is not the same as onothers guys so its guidlines you get here then make a choice. I just installed the PDR 35 and havnt towed much with it so far but it seems like a nice improvement.

 

[mperkins40]

RE: EGT Too High (LONG)

In have experienced the same thing - EGT's going out of control. Using TST #8, and Transgo Shift kit. EGT's easily exceed 1500 degrees only while towing in O/D. Great power but when O/D kicks in on even small grades the EGT's skyrocket. The only thing that I have noticed is that when my boost (stock turbo) exceeds 32 PSI in O/D (around 2000+ RPM's) is when the EGT's rise. If I can manage to hold throttle to keep boost at 32 PSI I get the power but EGT's are at 1250. Yes the water temp also increases I can hear the annoying radiator fan cycling as well. I am at almost maxing GCVW (17,500) when my normal towing setup was weighed last year. I seem to be driving at 2300+ RPM's everytime I tow. I get 9 mpg when towing, 12 mpg unloaded.



Loosing the cat dropped the temps slightly Maybe 100 degrees, but the exhaust smell that is now no longer filtered is terrible. Since the cat was removed, I also now have black smoke sputtering out of the exhaust when idling . I also spoke with Mark at TST and at his advise re-checked all turbine hoses/clamps and the charge cooler. He said that the #8 plate shouldn't run this hot.



I have a 3" exhaust. (Using Amsoil airfilter stock box) Timing was increased to 15. 5. Rear Diff 4. 10



Looking to increase turbine housing and try a 4 " exhaust. After this I am out of ideas. Sometimes I think of selling the truck to get a 24 Valve and an Edge EZ. to ease this PITA problem.



What about getting an ATS transmission w/triplelock T/C and increasing hp? Will this allow me to tow at lower rpm's, control boost, and thus lower EGT's while not losing the power?



Maybe plate is too far forward and I need to move it back. I may have just been using more power (fuel) then the plate was intended to provide.

 

[zzman]

Hey propuller, did you mention what gear ratio in rear end?



I have 3:54 and have no problems pulling at 2000, 2100 rpm.

I know mine is a manual, but when I reach 70 mph (right at 2100)

my water temp will begin to rise and mpg begin to sink.



If he is turning 2500 to stay afloat, is the gear ratio too high?



Just thought I'd ask.

 

[WadePatton]

Re: RE: EGT Too High (LONG)

Originally posted by mperkins40



I have a 3" exhaust. (Using Amsoil airfilter stock box) Timing was increased to 15. 5. Rear Diff 4. 10

Looking to increase turbine housing and try a 4 " exhaust. After this I am out of ideas.

Either drill that silly stock airbox or dump it for a BHAF. ATS manifold. Move plate just a teeny tad back. And I wouldn't have a 12v without a 3k GSK.

 

[Deezul1]

Moving the plate just small amounts can make a large EGT difference. With mine full forward towing EGTS can be a problem but with it back 1/8" it made a huge difference and power decrease is small. Try several positions and I think you will find a setup you can live with.

 

[mperkins40]

Thanks on the advice:



Moving the plate: Where can I get more break off screws for the AFC housing?



ATS manifold: IS this really necessary? My manifold doesn't appear to be cracking or brittle. Or is this an upgrade to do when I swap the 3" for a 4" exhaust?



Turbo hoiusings and exhaust brakes: What is recommended for a 4" exhaust?



Thanks

 

[Piston Slapper]

You don't need to put the break off screw back. Just get another screw just like the others, and replace the lock washers with new ones. The old ones will allow the bolts to back off after you pull them out and oil will spill everywhere... . ask me how I know!

 

[mperkins40]

Piston . . . you sound like me when I didn't torque the valve body bolts (I thought I did), while installing shift kit. During the midnight test drive it came loose and I lost all transmission power at the bottom of the driveway .



#@$%!



Had to have AAA tow me back up the driveway. . . It's funny now but it wasn't then. Glad it was the only problem

 

[Piston Slapper]

Yeah, ain't wrenching fun!!



I forgot to add about the ATS manifold. It is definitely heavy built and does help with spoolup. I think it only dropped the EGT's on our puller 50-75 degrees though... Is it worth it? Don't know? It sure is pretty in there though with a big turbo hanging off it!

 

[Cumminsman]

They sell the bolts and lock nuts at autozone. it's metric. that's about all i remember... ... .....

 

[propuller]

Originally posted by zzman

Hey propuller, did you mention what gear ratio in rear end?



I have 3:54 and have no problems pulling at 2000, 2100 rpm.

I know mine is a manual, but when I reach 70 mph (right at 2100)

my water temp will begin to rise and mpg begin to sink.



If he is turning 2500 to stay afloat, is the gear ratio too high?



Just thought I'd ask.

His gear ratio is 3:54 also. Were going to set the timing at 15. 5 & see what that does. The truck already has a 4 inch aftermarket exhaust & all the boost connections are tight. It also has a dtt transmission so there is no slip at all & all the power is getting to the ground. I may try a 16cm housing & if that doesnt work we might look into a pdr 35 or the dodgzilla turbo. If all else fails we will have to slide the plate back. I dont understand how this thing gets this hot with such little power. My 24 valve didnt get this hot with the stock hy turbo,ez & stage 2 injectors.



Kurt

 

[Deezul1]

I use Allen head bolts and only use 3 as the 1 under the injection lines is a PITA when you go in there very often, it wont leak as its a blind hole. A long T handle Allen wrench gets them out in 2 minutes.

 

[mperkins40]

Piston . . . you sound like me when I didn't torque the valve body bolts (I thought I did), while installing shift kit. During the midnight test drive it came loose and I lost all transmission power at the bottom of the driveway .



#@$%!



Had to have AAA tow me back up the driveway. . . It's funny now but it wasn't then. Glad it was the only problem

 

[dieselburner]

Re: RE: EGT Too High (LONG)

Originally posted by mperkins40

: [/B]

I get 9 mpg when towing, 12 mpg unloaded.





I would check out your setup. You should be getting much better mileage than that. I pull 13,500 pounds and get 14 mpg on the flats and and 11-12 in the mountains. I get 18. 5 unloaded while commuting over a hill each way while drag racing any furd that wants to play. I had a best of 25. 8 mpg on the flats at 55mph... that was a long day. You are running way too fat and by that I mean your mixture is too rich or you have a timing problem. Check out your hose clamps on the pressure side of your turbo to begin with. PM me and I wil try to help.

 

[DMC]

Proppuller:



I saw that you are using the K&N filter in your airbox. I don't mean to sound like a know it all. But I put one of those in my airbox and within 5000 miles I had silicon levels of 60+ on my oil analysis. I removed it and went back to the fleetguard paper element. It took two more oil changes to get the silicon down to 10 or 11. I have since put the Napa 2790 on there and it flows air pretty good for my needs and has kept the silicon levels down also. If you insist on using the K&N then please take samples of your oil at each oil change an check it out yourself.



Good Luck



Don

 

[propuller]

Originally posted by DMC

Proppuller:



I saw that you are using the K&N filter in your airbox. I don't mean to sound like a know it all. But I put one of those in my airbox and within 5000 miles I had silicon levels of 60+ on my oil analysis. I removed it and went back to the fleetguard paper element. It took two more oil changes to get the silicon down to 10 or 11. I have since put the Napa 2790 on there and it flows air pretty good for my needs and has kept the silicon levels down also. If you insist on using the K&N then please take samples of your oil at each oil change an check it out yourself.



Good Luck



Don

Thanks for the headsup on this Don. I will check into it.



Kurt

 

[DPS]

try a pipe plug not a tst boost elbow, they tend to leak too much boost off, more air to a certain point equals lower egt, don't spend money on housings just adjust fueling to the point of max power/least egt's its there you just have to play to find it