Hoosier Daddy

When I purchased my exhaust, I never planned on boosting over 6psi. Well, plans changed and i'm stuck with 2.5" I'm aiming for 350-400whp. Will I be alright with this exhaust? I'm getting a downpipe made, would there be any benefit to ordering a 3" dp instead of 2.5?

Thanks!

Mase

2.5 inch will be ok

Hoosier Daddy

Mase to the rescue!

FOrSfEd

Yeap, as always lol

Nextelbuddy

you should be fine. 2.5 inexhaust is plenty. hell i got away with 2.25 crush bent exhuast for a while but i changed that out to 3 in.

m R g S r

You may have to run a little more boost as opposed to a full 3" exhaust to reach your goals.

JDogg

it will work, but remember.. for turbos, the bigger the better.

Trak_Day

As said, it can be done. But it seems that you have a nice chunk of change to put into a setup to make that power. seems like it may be a wise investment for a 3" exhaust

TravSi

2.5" will be fine, you can always get a cut-out

Hoosier Daddy

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by calmweed &raquo;</TD></TR><TR><TD CLASS="quote">

to stupid *** kissing for a simple question</TD></TR></TABLE>

I think i'm just about the only memeber left that doesn't kiss the top 10 guys *** on this forum.

Being nice/sense of humor != kissing ***.

Thanks for the help everyone

jmal1919

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hoosier Daddy &raquo;</TD></TR><TR><TD CLASS="quote">When I purchased my exhaust, I never planned on boosting over 6psi. Well, plans changed and i'm stuck with 2.5" I'm aiming for 350-400whp. Will I be alright with this exhaust? I'm getting a downpipe made, would there be any benefit to ordering a 3" dp instead of 2.5?

Thanks! </TD></TR></TABLE>


Why not just get a 3" dp matted to a 3" flex pipe matted to a 3" pipe narrowed down to your 2.5" exhaust. that way, you don't have to try and find a buyer for your 2.5" and you still get some of the benefits of having a 3" "immediately" downstream of the turbine.

I'm not an expert or anything, but from reading, it seems like the less restriction you have immediately after the turbine is what makes the biggest difference, and taking it from a 3" to a 2.5" shouldn't hurt at all.

bump for the learning/thinking too much noob


some interesting reading...
http://www.vishnutuning.com/exhaust101.htm

quikB18B

Or you could just get your 3" Dpipe and then run Open Downpipe

If your planning a 350-400 hp setup, it will cost $$$ so why not spend the extra? If it were me I would, but the 2.5" can still make that power so It all comes down to $$

Joseph Davis

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg &raquo;</TD></TR><TR><TD CLASS="quote">it will work, but remember.. for turbos, the bigger the better.</TD></TR></TABLE>

Bigger what? Bigger boost required with the smaller exhaust, or the bigger exhaust that allows you to run less boost at your chosen power level?

As long as you aren't running off your compressor map, go whichever way is cheapest. The suggestion to run a 3" dp into a 2.5" exhaust is a valid one, btw. Exhaust gas cools rapidly, and takes up less volume... if the reduction to 2.5" is far enough away from the turbo, you will have little to no loss in power BUT you will have a big loss in exhaust noise. It's been proven a couple dozen times over by JYTurbo members on $3000 9 second rides; 3" exhausts reduced to 2.5" at the muffler or at the tailpie coming out of the muffler loses no appreciable power output but quiets the exhaust noise LOTS.

JDogg

4 inch down pipe out the hood biatch

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by J. Davis &raquo;</TD></TR><TR><TD CLASS="quote">

Bigger what? Bigger boost required with the smaller exhaust, or the bigger exhaust that allows you to run less boost at your chosen power level?

As long as you aren't running off your compressor map, go whichever way is cheapest. The suggestion to run a 3" dp into a 2.5" exhaust is a valid one, btw. Exhaust gas cools rapidly, and takes up less volume... if the reduction to 2.5" is far enough away from the turbo, you will have little to no loss in power BUT you will have a big loss in exhaust noise. It's been proven a couple dozen times over by JYTurbo members on $3000 9 second rides; 3" exhausts reduced to 2.5" at the muffler or at the tailpie coming out of the muffler loses no appreciable power output but quiets the exhaust noise LOTS.</TD></TR></TABLE>

SOHC_MShue

hey i got an exhaust question. What is the best way to couple a 2.5" downpipe to a 2.25" exhaust? I am about to do this this weekend and i'm not sure how to hook the downpipe up to my test pipe. Are there any donut gaskets like the stock one that I could use to fit the downpipe up to the 2.25" test pipe?

Hoosier Daddy

You can always get a 2.5" to 2.25" reducer.

slowazzhatch

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg &raquo;</TD></TR><TR><TD CLASS="quote">it will work, but remember.. for turbos, the bigger the better.</TD></TR></TABLE>

you sir are incorrect...bigger IS not better in some cases, if how efficient the turbo is... you can run a t-78 and not boost till god knows when, or you can run a t04b-46 housing with a 60trim .82 A/R and boost early and have a decent turbo, MY plans were 3 inch DP then 2.5 back, was goinng for 300whp, so 2.5 will do just fine, remember your not a supra...

JDogg

its still a turbo, and what does backpressure behind a turbo do?

lets all say it together......... it SLOWS it down

DIRep972

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDogg &raquo;</TD></TR><TR><TD CLASS="quote">its still a turbo, and what does backpressure behind a turbo do?

lets all say it together......... it SLOWS it down </TD></TR></TABLE>

for real, lets all yell at once......... BACK PRESSURE IS BAAAAAAAAAAAAAAAAAAAD!

running more boost to make up for a small exhaust because u r too cheap to do it right is just retarded. Back pressure causes more problems then just a loss in peak power.

jeremy.

screw it and run a e cut out

Hoosier Daddy

Who said anything about being too cheap to do it right? Maybe that was a general comment, but some people change plans just like I did.

DIRep972

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hoosier Daddy &raquo;</TD></TR><TR><TD CLASS="quote">Who said anything about being too cheap to do it right? Maybe that was a general comment, but some people change plans just like I did.</TD></TR></TABLE>

haha my bad, that was not directed to you. It was just in response to J. Davis who implied that both set ups could have the same end results, which is not true.