Engine/Transmission (1994 - 1998) How do I lower the exhaust temps?

[JDKammin]

I have a 96 truck with a 5 speed. I have installed an AFE intake, MBRP 4" exhaust, 3 gsk, and #10 plate in stock location. The rest of the pump adjustments are in the stock location. The exhaust temps are OK without a trailer. I am helping a friend move and the enclosed trailer I am using is probably an 8'x18'. I am not loaded very heavy and noticed that I can easily hit 1200* when pulling up out of a river bottom hill. I have the pyro on the hot side of the turbo. Boost will peak at 27 lbs. I am guessing I need to get some more air through by using a different turbo. Do I have other options? Thanks.

 

[MPascino]

1200 isn't too bad if you are not going exceeding it. I would think you could do a little better than 27 lbs boost though. Setting your wastegate to kick in at say 32 may make enough difference. Just a thought. Good luck,

Mike

 

[Matthug]

Yup just up the boost 5-8 PSI, the HX35 is efficient to 35 pounds of boost.

 

[JDKammin]

Do I up the boost by installing an adjustable boost elbow instead of using the orficed elbow that came with the #10 plate? Thanks.

 

[Matthug]

Yup, you can get it from TST or on ebay.

 

[Jetpilot]

Raising the boost to 35 lbs will probably raise egt's using an HX-35. The HX-35 is best limited to between 27-30 lbs boost (we have tested this numerous ways including the dyno, towing and daily driving), yes you can get more boost but HP will be less and egt's will normally go up. This is due to the efficiency of the turbo and the backpressure of the increased boost.



What I would try first is setting your timing to around 15. 5* - 16*, this will bring egt's down some plus if you can do it yourself it won't cost anything. Do not go too high and this can cause problems with your headgasket, but you should be safe in the range mentioned above. If this does not lower them down to an acceptable range you should consider a turbo upgrade... . There are several great options but be sure and match you desires to the turbo, what works well for someone may not work well for you. Call around and ask folks who are knowledgeable on the turbos they sell and go from there.



Doug Smith

 

[McLaughlin]

Another alternative is to install a Snow water/meth injection system.

 

[The patriot]

Yup, you can get it from TST or on ebay.

You can also adjust the arm on the wastegate.

I think making it longer makes more boost??

Somebody correct me if I'm wrong.

Eric

 

[Matthug]

Shorter is more boost, puts more preload on the diaphram.



Jetpilot, I've always heard 35 PSI being the number on an HX35 and 30 PSI on an HY35. After that they are horribly inefficient.

 

[pwerwagn]

It also depends on the altitude your running at. The PR gets higher with the same boost # as altitude increases...



--Jeff

 

[The patriot]

Shorter is more boost, puts more preload on the diaphram.



Jetpilot, I've always heard 35 PSI being the number on an HX35 and 30 PSI on an HY35. After that they are horribly inefficient.

Thanks. It's been a while.....

 

[JoeyJ]

Not sure I'd be too concerned with 1200 degrees. 1300-1500 very much so. I can hit those numbers easily if I'm not careful. I have the Snow system at the top of my list as a next purchase. Just curious what does your engine temp look like when your pulling higher EGTs. Part of my problem was a bad fan clutch. This lowered my sustained up hill pull egts by about 100 degrees on average.