The Question is above. Answers appreciated.

My setup:

D16y8 JRSC 6 P.S.I.
P28 chipped ECU with crome (No FMU)
RC 440 Injectors.
Short Ram intake
DC Header
2 1/4" Straight pipe exhaust
5 Zigen Fireball Muffler

Thanx!!!!!

 

yes, any changes to the way the motor breathes will effect a/f ratio and turbo spool. especially a cat

 

I would throw a wideband on it and make sure everything is okay. It shouldn't change things that much, but better safe than sorry.

 

Thanks for replies

By the way I want to use a High Flow cat and mainly just want it to quiet things down.


Modified by Budget Racer at 1:59 PM 6/3/2008

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dpetro1 &raquo;</TD></TR><TR><TD CLASS="quote">yes, any changes to the way the motor breathes will effect a/f ratio and turbo spool. especially a cat</TD></TR></TABLE>

Just wanted to note that I have a super charger, and not a turbo.

Does anyone know if a highflow cat would effect airflow much as far as tuning goes, and if so what cat would be the least restrictive? I only want to put the cat on to quiet my ride down. I thought of using an extra resonator, but they are fat and I'm not sure if I will have clearence issues, or if they will quiet things down as much as a cat would.

Knowledge masters please advise!!

&lt;breath, breath, breath&gt;

 

A Carsound cat works very well, and considering you're only 6 psi, shouldn't effect it that much.

Also, you may consider simply adding a resonator. That would be even less restrictive than a high-flow Cat.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TheShodan &raquo;</TD></TR><TR><TD CLASS="quote">A Carsound cat works very well, and considering you're only 6 psi, shouldn't effect it that much.

Also, you may consider simply adding a resonator. That would be even less restrictive than a high-flow Cat. </TD></TR></TABLE>

Thanks for the suggestion. I'll look into that.
If I can fit a resonator then I might go that route.

Cheers!!

 

[damn last comment posted twice. Doh edit edit edit

 

If you dont have emissions to deal with, you may want to even put two resonators on it. My last 3" exhaust I made was catless with 2 cheap summit resonators. It sounded very nice, although it was helped by the turbo as well.

As mentioned, it will change AFR's, but by how much I can't say. Speed-density (MAP sensor) ems's will not alter the open-loop/WOT fuel maps, and virtually any changed part will result in AFR differences.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">If you dont have emissions to deal with, you may want to even put two resonators on it. My last 3" exhaust I made was catless with 2 cheap summit resonators. It sounded very nice, although it was helped by the turbo as well.

As mentioned, it will change AFR's, but by how much I can't say. Speed-density (MAP sensor) ems's will not alter the open-loop/WOT fuel maps, and virtually any changed part will result in AFR differences.</TD></TR></TABLE>

Yeah I've played with the idea of getting another resonator, but I don't think there is room for a big one. I don't think a small one would make much difference, but maybe. It's definately cheaper though. I'll just try it and let you guys know what happens.

Peace out 4 now!!