Thread: What to do after headers?

I just finished installing ZZPerformance stainless steel headers and 3" downpipe with high-flow cat. I also did the machine LIM with the intention of machining the supercharger housing in the future.

My question is what to mod to take advantage of the headers? Should I get a re-tune (I have a 3800 performance tune now) or a smaller s/c pulley (I have a 3.4" now)? See my sig for all my mods.

I have scanned the car on a few runs and don't see any knock retard going on like I had before the headers.

Brent

2002 GTP - K&N, ZZP Headers, 3800 Perf Tune, ZZP LIM, 3.8" S/C Pulley

I don't know if you'll be safe running a sub 3.4. You're going to have to try omit though and scan it or knock. Although you're pobably gonna need rockers or intercooled to run knock free.

Originally Posted by Bio248

get rockers.

Agreed. They bring the top end to life.

So are you guys saying a re-tune would not net me much with an adjustment to the timing tables? I was always under the impression that the engine could handle more timing after headers due to increased exhaust scavenging, thus more horsepower.

Wouldn't running rr's net more with a re-tune as well? At what ratio is replacing the valvesprings necessary?

not to thread jack but what rockers do you recommend and do you have a link?

what are your goals? if you want to start dropping pulleys then go for the intercooler...

Originally Posted by bluegtp91

Not necessarily true...you can go other routes cheaper, such as methanol injection, a custom tuned PCM, and/or rockers/cam. It isn't always about dropping pulleys...a guy with a larger pulley and a better tune will eat up a smaller pulley car that isn't tuned well enough.

can't beat an intercooler....

Originally Posted by bluegtp91

a guy with a larger pulley and a better tune will eat up a smaller pulley car that isn't tuned well enough.

tuning is a given...shouldn't be dropping many pulley sizes without

Thanks for the replies. Just for reference, any future mods would be limited to a ported s/c housing, re-tune or smaller pulley and possibly an intercooler (but that's a bit pricey). I've been toying with rockers/springs but haven't convinced myself yet. I have to keep in mind that I'm supposed to be completing my engine rebuild on my Z28. :-)

I'll probably go with a re-tune to get it cleaned up since there are aspects of the 3800 Perf tune that I'd like to change anyhow.