THDP vs. stock elbow question

[BlackBeauty]

Hy folks, I recently swapped over to a TE-44, and I am currently running stock turbo elbow and ATR 2.75" dp. Well the elbow is very small compared to the exhaust opening on the turbo. It appears to be a restriction. Today I took the elbow off, and I can see where the elbow is restricting the turbo (a circle of carbon deposits I guess). If I did some major porting on the inside of the elbow, I would be able to eliminate most of that overlap, but maybe not all. My question is, is the THDP bigger where it hooks up to the turbo? I would not like to get that expensive piece then have to modify it. The hole in the turbine side of the turbo is 2.5" in diameter, the THDP is 3", I just want to confirm that the 2.5" opening is completely within the dp opening. Thanks.

 

[VIN7]

Try porting your stock elbow first. I ran 114 mph through the stock elbow (ported) and stock downpipe.

You won't have any overlap with the THDP, it's 3" plus the section that covers the wastegate hole.

Mike

 

[V8KILLR]

I'd go for the THDP, 3" or the 3.5" and yes it will fit right. I have the 3.5" and like it very much. I have never seen another TR with the 3.5" and went ever I pop the hood people are like DAMN thats big .

Jason

 

[UNGN]

Originally posted by BlackBeauty
The hole in the turbine side of the turbo is 2.5" in diameter, the THDP is 3", I just want to confirm that the 2.5" opening is completely within the dp opening. Thanks.

A standard THDP uses a 3" pipe, but at the mounting flange it opens up. If your turbo uses a 3 bolt exhaust housing, you shouldn't need to modify a THDP to work.

 

[BlackBeauty]

Re: Re: THDP vs. stock elbow question

Originally posted by UNGN
A standard THDP uses a 3" pipe, but at the mounting flange it opens up. If your turbo uses a 3 bolt exhaust housing, you shouldn't need to modify a THDP to work.

Thanks for the replies everyone. UNGN, I read your great THDP vs. stock elbow/2.5" dp posts a while back, I don't even think my tires could handle an extra tenth (they can't handle what I am capable of now anyway). Very interesting, I would think that a 3" dp would allow the turbo to spool quicker and would add more power, but from your results, it shows a small increase, hardly worth $380.
Since it is hard to justify spending $380 for a pipe, I am currently considering trading my stock wheels and stock turbo for a 3" ATR new. My 2.75" dp is cracked at the end, so I would have to get a custom pipe made to fit the end of my dp which has a diameter somewhere between 2.75"-3". So I was thinkin' of going ahead and just getting the 3" dp and a straight pipe.