how much of a hp gain you guys think I will get by upgrading to a 3in exhaust? is it worth the money or just keep what I got???

 

you may even lose some power......

even with crazy boost, its not allway bigger=better....... you should be fine with 2.5 and a good tune.....

 

depends what your looking for in the vehical..but over all 3 inch is better for power on a turbo car.... bigger is better..

 

go with the 3"

 

i got 3in. straight back no muffler. hehe. im going to be putting a cherry bomb in there to make it a but quiter. but yeah..3in would be the way to go.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92blkJDMh22 &raquo;</TD></TR><TR><TD CLASS="quote">you may even lose some power......

even with crazy boost, its not allway bigger=better....... you should be fine with 2.5 and a good tune.....</TD></TR></TABLE>
I disagree, bigger is not always better, but 3" certainly isn't too big.

 

3" for sure, i built my own for less than $250, prelude exhaust is very simple about 8ft of striaght tube and 2 45* bends or 1 90*(thats what i did), 3" magnaflow cat, some flanges and a big 'ol muffler. I didn't use a resonater and it sounds great. I welded all mine so add a little more for that.

But it will definatly improve power, backpressure can be good for NA but there is enough of that before the turbo, a large exhaust will also help on spool time, everyone told me my turbo was going to be too big, with a 3" ex. it spool at 3k rpm.

2.5" maybe "good enough" for less than 250hp but if you decide to go bigger 3" will be good enough for any power to plan to make.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by maxvtec7500 &raquo;</TD></TR><TR><TD CLASS="quote">
I disagree, bigger is not always better, but 3" certainly isn't too big. </TD></TR></TABLE>i agree. to big will cause creep.

go on ebay an look at there mendrel bends. thats what i was going to do. i got me some creep with a 3in. im running a t3/t4oe 60 trim with a .63ar. 38mm tial WG with a 7psi sprin an boost somehwre around 8-9 psi. i think once i put a resinator in it would be ok.

 

how do you know it's not your manifold design? and/or wastegate location?

 

because before i was running stock exhaust. boosted 7psi all day. as soon at a put 3in on it jumped up.

manifold is hermsfab mani. wg is where it surpossed to be. heres a picture.

 

Go 3in if your runnnig a large turbo!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaPH22 &raquo;</TD></TR><TR><TD CLASS="quote">how much of a hp gain you guys think I will get by upgrading to a 3in exhaust? is it worth the money or just keep what I got???</TD></TR></TABLE>

3in is perfect I run a full 4inch on my turslo car with 4in inlet to 3 inch outlet works great 3 inch was just to small. But for most normal aplications you will be just fine

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by md23vtec &raquo;</TD></TR><TR><TD CLASS="quote">

3in is perfect I run a full 4inch on my turslo car with 4in inlet to 3 inch outlet works great 3 inch was just to small. But for most normal aplications you will be just fine </TD></TR></TABLE>

yep, 3" will do u nicely...im going 4": myself real soon...wait that means i have a 3" one i need to get rid of, pm me

 

im running a greddy 18g turbo

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92blkJDMh22 &raquo;</TD></TR><TR><TD CLASS="quote">you may even lose some power......

even with crazy boost, its not allway bigger=better....... you should be fine with 2.5 and a good tune.....</TD></TR></TABLE>


you may be fine with a ***** in your butt....show me your losses with a 3 in...

btw go with a 3 in you cant go wrong with h series and airflow..esp turbo

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CGags13 &raquo;</TD></TR><TR><TD CLASS="quote">


you may be fine with a ***** in your butt....show me your losses with a 3 in...

btw go with a 3 in you cant go wrong with h series and airflow..esp turbo</TD></TR></TABLE>
...
I'm questioning myself if I should put that first line in my sig or not...

 

****, even jd3jdm used a 3 inch for his n/a build and he made like 250+whp. the size of the exhaust should go with your power goals. can't go wrong with a 3 incher though.

 

The main place you really need the diameter to be bigger is the downpipe. I would have like a 3" downpipe to like 2.5" exhaust back. The piping right after the turbo is the most important to eliminate any backflow into the turbine wheel.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nah22accord &raquo;</TD></TR><TR><TD CLASS="quote">The main place you really need the diameter to be bigger is the downpipe. I would have like a 3" downpipe to like 2.5" exhaust back. The piping right after the turbo is the most important to eliminate any backflow into the turbine wheel.</TD></TR></TABLE>

I like this comment the best since I to am in the process of figuring out what size piping to go with for my turbo setup

 

It has been said that the best exhaust for turbo is no exhaust....IMO bigger is better. You don't really have to worry about exhaust gas pulses or back pressure with a turbo. You just want to get that crap out of there as easily as possible to make it easy on your turbo.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ralpheyizzle &raquo;</TD></TR><TR><TD CLASS="quote">****, even jd3jdm used a 3 inch for his n/a build and he made like 250+whp. the size of the exhaust should go with your power goals. can't go wrong with a 3 incher though. </TD></TR></TABLE>

correct my friend..and if I may directly quote Brad from RLZ: "Man you can even go 3 inch on a N/A lude (h22) with bolt-ons...those engines love air..."

so you can see why i had to rage on that rook before..nothing like ASSumptions!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CGags13 &raquo;</TD></TR><TR><TD CLASS="quote">correct my friend..and if I may directly quote Brad from RLZ: "Man you can even go 3 inch on a N/A lude (h22) with bolt-ons...those engines love air..."</TD></TR></TABLE>

Are you serious about the 3'' for a NA H22 with nothing but bolt ons?

 

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

Are you serious about the 3'' for a NA H22 with nothing but bolt ons?
</TD></TR></TABLE>

man im like old abe.....i **** you not friends..my bro went to a cutout and im looking to either do a 3 inch or a cutout soon

 

Damn, I always ASSumed for NA ludes 2.5 was plenty big.

I guess I ASSumed wrong huh?

I am gonna have to consider that when I upgrade my exhaust - someday. Just prolly not for my DD, since I don't need the tickets

 

maybe i should just get a 3.25 in exhaust go the extra .25! why not