Is there much of a power gain between a Turbo Back vs a DP back? Lets say mods are cams, injectors, IC & an ECU. I havent found any power comparsisons between the 2 regardless of mods.

I see that several companies offer a turbo back for the stock turbo. I have also read that D. Buschur is very vocal on how unnecessary it is to run a turbo back because the stock piece between the turbo & DP is decent in design.

Any thoughts, experiences ( On Topic ), dyno results

 

DP is a BIG MOD, very VERY Big, I would never get an exhaust unless it was a turbo back 3.0, DP is HUGE for a turbo.

The stock piece is a Decent design, but is still a 2.5 PRESSBENT unit, get a 3.0 TURBO back mandrell bent unit, I cannot stress that enough.

 

You seem to have a miss-conception here. I think that what you mean by "downpipe back" is actually from the O2 housing back. If this is what you mean, then a "downpipe back" and "turbo back" are the same damn thing! The part Dave Buschur says is a good factory piece is the O2 housing. The reason he doesn't like the O2 housing eliminator downpipes that many companies are making is because they are a royal pain in the *** to put on and take off.

Keith

 

Agreed except I have seen 2 different cars post +5 HP over O2 Housings bock- certainly within car to car varience and not worth the extra pain but if done right have the potential to put out more

 

I agree that it does make a power gain to have an O2 housing eliminator downpipe. I just think they should be in two pieces....the O2 eliminator, and a downpipe that attaches to the O2 eliminator. The way most venders are doing it makes a clutch change, or any tranny repair work a total pain in the ***. The turbo upgrade setup from Dave Buschur will include a new O2 housing (tubular if I remember correctly) that will flow as good or better than the ones that are integrated into the downpipe, and it will keep the "ease of use" of the stock setup.

Keith

 

the o2 eliminator pipes are about 10 pounds of weight reduction as well, and faster spool.

 

Really? I doubt if the stock O2 housing weighs more than 5 lbs total so I don't see how you can get a 10 lb weight reduction. I agree that it will improve spool though.

Keith

 

Have you taken it off? Its tjick cast

 

It's a little bigger (not much) than the 1G and 2G DSM O2 housings, and they weigh in at about 5 lbs if I remember correctly.

Keith

 

We have seen great improvemnts with our 02 elim downpipe set up. It enabled our car to spool faster and provides about 9whp over the stock restrictive housing. It is also much lighter.


Here is an older style pic, but we have now moved the 02 sensor to lower in the downpipe stream so it is out the wastegate path.

 

ANyone who has SEEN a Lancer Evo 02 Housing knows that it is no where NEAR restrictive. DSM owners upgrade to them over ported 2G manifolds, they flow NICELY and are not restrictive in the least.


Again get a turbo back exhaust, 3.0 mandrell bend no cat, net 30-40WHP accross the board.

 

[QUOTE]Originally posted by Fourdoor
[B]

You seem to have a miss-conception here. I think that what you mean by "downpipe back" is actually from the O2 housing back. If this is what you mean, then a "downpipe back" and "turbo back" are the same damn thing!

The O2 housing is the piece between the turbo & DP? Next time when I refer to a part, I'll be certain to get a part number for you. Yeah right.

However, the insight to the difficulties for swapping out a clutch at a later time with an "O2 elimiantor housing" IS the type of info I was looking for.

As far as the power gains, after what mods is it really necessary to swap out the O2 housing? besides changing turbos for all you flamers out there!

I see mention to quicker spool up, but how much quicker & where? Part throttle street driving is what I do 95% of the time or is the gain realized under only WOT conditions?