Engine/Transmission (1998.5 - 2002) EGT reduction What next?

[Bodybomber]

Im looking to reduce my egt's a little more. I currently have a Volant intake and 4 inch exhaust with straight through mufflers. Is the next logical step a larger exhaust housing for my HY35 turbo?

 

[KLockliear]

There is no optional housing for the HY-35. Your next move it likely a larger turbo - hybrid or something bigger, depending on what HP you will have when you are done.

 

[boydo]

A B-1 or a PDR HX35 would make a huge difference on egt's, or water/meth injections works well to.

 

[CRSmith]

You can look into a new camshaft like diesel dynamics.

 

[Bodybomber]

Thanks for the info. Would it be worth the effort to find a hx35 and put a larger exhaust side on that?

 

[y-knot]

Water/meth injection is a joke for lowering EGT. They are a very short term fix, maybe for pulling? but anything else it's not practical. You are limited by the size of the resivor, the two or three minuets you get out of the tank makes it a joke. Far from a workable solution for reducing high EGT's on a street driven truck.

Your 4" exhaust is plenty big. Do you have a stock turbo? I did not see anything in the sig to suggest otherwise. I went to a 16cmsq housing, and it really flows alot more air, which resulted in about 100-150 degree lower EGT's. But, like all things, it did not come without cost. The bigger housing takes longer to wind up, it also produces less psi at low rpm levels. Towing it proved to be great, and a possitive change. Up everyday driving you loose a little low end power. To combat this loss I insulated the exhaust manifold,exhaust side turbo housing, downpipe and elbow. This really helped the thing get going, the extra heat (energy) makes a noticable differance. Also the insulation made for lower underhood temps, which made for lower intake air temps, a true win/ win. The insulation route is easy and has been used for years in other industries, it simply allows the turbo to recieve a maximum of the heat developed in the combustion process. I went even further and insulated the intake air track, from air box to turbo, to intercooler and intake horn. The deal being to keep as much engine heat away from the charged air mass as possible, this is also known as heat sinking.

What did I learn? I learned that it is possible to lower EGT's and underhood temps while still keeping my performance. I learned that heat is free energy, so why not use all of it? And I learned that thinking outside the box pays dividends, some times. Also, as a bonus I lowered the interior noise levels to where I can carry on a conversation without shouting, or hear the music at low levels. You may or may not want to take this route? But atleast now you know of one additional option



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[boydo]

I ran a HX-35 with a 16cm non wastgated exaust housing for a while and really enjoyed it, at the time I had a edge comp, rv275 injectors, LPG, and 4" exaust and afe intake. The turbo spooled well, and would produce 38 psi - the egt's dropped at least 100 f with the 16 cm compared to the stock 9cmWG. I would say that a hx3516cm would make about 30-35 psi max in your application which is still well within a safe limit.

 

[SHobbs]

Ok I got to know. I have the HX35 12cm I believe thats the stock size. I have the B. H. A. F and my ring wound up on the back of a milk carton. I will be changing the housing out to a 14cm. I really like to hear that puppy sing but, how can I make it scream. I wound up behind a new furd the other day, I could hear him spool up from two cars behind him. I knew every time he hit the go pedal. Will a larger housing do this? I am upgrading to a larger for more mid range, top end and for the EMD 1. 5's coming soon not just for the whistle, but I do want it louder. Alot cheaper to do the housingthan a complete turbo. The HX35 is a good unit, I talked to Piers and was told changing the housing would not be too difficult. I guess I will find out, but, hey I got the TDR to help if I need it. Oo.

 

[RCone]

Put a Scotty II on it and open up the cowl. Then you should be happy with the tune it's playing, plus lowering your EGT's.

 

[JoshPeters]

The Twin turbo trucks REALLY scream. Immagine a Semi turbo under your hood. That's what it sounds like.



Josh

 

[SHobbs]

Ok, here's the question. What are you talking about when you say open up the cowl? I don't remember seeing that anywhere.

 

[RCone]

With a Scotty II you have two options on how you set it up. The standard fender opening and then if you want max cooling (and noise) you cut a 4-1/2" hole in the cowl, the Scotty is designed to fit that hold and you get the ram air effect from the louvers at the bottom of the windshield. Plus, as an added benefit you can hear it right thru the glove compartment and it will suck all of the dust out of your glove compartment. If you cut the hole, then only want to use it for max cooling when towing, racing etc. , you can run it in the hush mode by simply folding the insulation back across the opening. goto to www.wildcatdiesel.com and you should see what I am talking about or maybe Rob or Scotty will jump in here and post a pic.



As a matter of fact go here: http://www.scottyairsystems.com/Scotty Air System - Dodge Page.htm