New Wastegate design???

[thekyguy11]

I came across something fairly interesting today. Will what I found carry over into the DSM world???

My father has a GMC 6.5 turbo diesel truck and he has a a few things done to it. 4in turbo back exhaust, K&N cone filter, high performance ECU. since he added these mods, the truck has ran very well, much more power, but it had a problem where it was overboosting to 17psi and he was getting fuel cuts. the ECU company said it should never see anything more than 15psi. For anyone who doesnt know, this engine uses no throttle plate and produces NO VACCUUM, therefore it has a vaccuum pump driven off the crank to control the wastegate. SO everyone he talked to said the only way to prevent this was to put it back to stock. Obviously this is lame, and not an option.

Finally he called a place and they suggested a new product that "just came out" and they havnt even marketed yet. So, he ordered it a few days ago, and I just installed it in his truck today. It's extremly simple, but today proved to be very effective. All it is, is a kit that replaces the wastegate, and plugs the one and only vaccuum line. Its basically a spring loaded rod that operates the flapper in the exhaust housing using the actual exhaust gas to open it. The spring tension is adjustable by tightening the nut that holds the spring to the rod.

During test runs (after a little tweaking), the truck boosted to 15 psi and that thing just pinned the needle at 15. no spike, no drop off. worked great.

Now, has anyone ever heard of such a thing??? Could this be something that would be effective on a mitsu turbo???

 

[turbo90gsx]

Sounds pretty interesting. Does that diesel realy only boost 15lbs? That seems really low for any type of diesel. I work at a dodge dealer and the cummins diesels see ALOT more than that stock!

 

[thekyguy11]

apparently these motors only boost to 8psi stock! My dad did not know at the time he purchased the truck that this particular motor has the least potential of all the turbo diesel trucks. We are trying to make the best of it anyways.

 

[92awddsm]

apparently these motors only boost to 8psi stock! My dad did not know at the time he purchased the truck that this particular motor has the least potential of all the turbo diesel trucks. We are trying to make the best of it anyways.

Chevy diesels have always had the least potential of any out there. Thats why they just got back into the market after years of having to contract all their diesel work. And once again, the powerstroke and cummins outdo the "quiet diesel" Anyway, I wouldnt even mod it if 15psi is all it should ever get. Both my powerstroke and cummins are designed to run more than that stock and hold up quite well at 35+psi.

And anyone familiar with a diesel engine know that they dont use throttle plates. A diesel engine will only rev when fuel is applied, not air. The more fuel you run, the more power it makes. The turbo is there to help it rev quicker and cool the combustion chamber and egt's.

 

[Liger]

Ummm, wouldn't the spring lose it's effectiveness over time and require constanst adjusting due to the heating and cooling cycles from running the car? And a spring that can operate and hold it's spring rate and tension under red hot conditions is impressive but is it going to work in the long run? Brandon [VFRacing]

 

[OverboostXS]

Also the Duramax (Chevy's diesel) is an Isuzu motor. Chevy never had much luck in the diesel market. I laugh when people call me a ricer when there driving an Isuzu powertrain around.

 

[92awdgsx]

I've seen these wastegate setups before. They work good till they wear out. With the amount of boost the DSM's are running the spring wears out very quick. You have to keep it lubed too or it will stick.

 

[thekyguy11]

Well, apparently this wastegate doesnt work as well as my dad and I had thought. Under heavy loads (towing, freeway, etc) it does spike. 5lbs actually, which is pretty sad.