I hope there are alot of you out there because I cant find 3.5" mandrel bent exhaust. Im thinking of getting a Kteller 3" exhaust, 3" dowpipe and 3.5" (5" x 8") magnaflow muffler from Jegs.

Im running 14 psi on a SC61 9:1 compression B18c built motor. I have a 2.5" dowpipe to 2.25" cat back exhaust and a stock IM that I think are the reasons for my low numbers (see sig). Also hondata is tuned pretty conservative 11:1 a/f or 10.5:1 a/f on boost if i remember correctly. Im going to get those things changed and put springs and retainers in the head. Im shooting for 25 psi - 28 psi (450hp+ I hope) using the new full 3" exhaust. Just wondering now if the 3" is adequate and/or if goals are attainable


Modified by Turbo Chris at 3:11 PM 6/19/2004

 

im sure there are a few. but on a similar note, would you make more power and or spool quicker with 3.5"? thanks

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Casey &raquo;</TD></TR><TR><TD CLASS="quote"> would you make more power and or spool quicker with 3.5"? thanks</TD></TR></TABLE>

yes, and with no exhaust you would make more still.

 

i made 489 on 19 psi w/ a greddy 2 3/4 exhaust.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by espanol &raquo;</TD></TR><TR><TD CLASS="quote">i made 489 on 19 psi w/ a greddy 2 3/4 exhaust.</TD></TR></TABLE>

ahh.. good to know

 

I think SP engineering just started making 3.5" exhausts for civic and integras.

 

just run an open exhaust

 

i made 534whp on 3" with 3 mufflers.a customer of mine made 443whp at 20 psi with 2.5"

 

i made 644whp in my old supra with a 2.75" midpipe and the rest full 3"....3" will be plenty for most setups

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by gritsak &raquo;</TD></TR><TR><TD CLASS="quote">i made 644whp in my old supra with a 2.75" midpipe and the rest full 3"....3" will be plenty for most setups</TD></TR></TABLE>

I think that might end the discussion right there.

 

3 inch is more then enuff for you, but if were on the topic of Supras i have witnessed Rados Supra do 788whp on a 3inch exhaust.

 

but assuming bigger is better, a car making 400whp on a 3" will make more with a 3.5 correct

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Casey &raquo;</TD></TR><TR><TD CLASS="quote">but assuming bigger is better, a car making 400whp on a 3" will make more with a 3.5 correct</TD></TR></TABLE>

The law of diminishing returns would probably begin to apply.

 

good point. factor in i can get the 3.5" for 210 shipped because its home made and not "pretty" but im sure it works well.

 

Well then, I guess its up to you.

You might also want to consider that it may limit muffler selection, and I don't know if they make resonators that big. You may have to put up with a raspy exhaust note.

 

it has a dynamax muffler and a small resonator...there are tons of turbo diesel duallys running around with 4" mandrel exhaust and turbo honda in general arent what id call raspy. sounds not really an issue, just dont wanna hear open dp all the time

 

I suppose if you can get it for cheap then go for it.

 

ok quick question then

how many of u are making 300+whp with a 2.5inch?

and whats ur setup :D