Rotary_Powerd

I have an S4 FC low miles. I was just curious how what kind of gains I could expect with the following.

-Switched to Royal Purple 1HP?
-Pacesetter header 5hp?
-Cat back 3hp?
-hi flow cat 2hp?
-K&N filter or Racing beat intake 1-2hp?

I'm trying to stay in the same class in autoX (or not move up too much). Any other worthwhile bolt ons?

Red'vert

Sneak some Pineapple Racing Port Sleeve Inserts in there.

Edit: Good thread...

https://www.rx7club.com/showthread.p...ear#post229200

Rotary_Powerd

Thanks! I forgot I could have the TB bored out. Are there any ECU upgrades I hear most of the power difference between the S4 13B and S5 13B is in the electronics. If I could gain maybe 7hp with an aftermarket ECU I'd be fairly happy.

Red'vert

The RTEK-7 2.0 has just been released for the S4 NA. $399 and you'll need a Palm compatible PDA...

http://digitaltuning.com/index.php?p...age=2&ecu=S4NA

Port & Polish on the TB may not gain much, but removing the secondary throttle plates is worth doing.

A little down in this recent thread is good stuff on intake mods and their efficacy:

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/some-questions-about-gasket-matching-manifold-porting-638610/

Rotary_Powerd

If I can drop my car down to 2500lbs and get the power up to about 170 crank hp. I'll be fairly happy. That should knock me below 7 seconds on the 0-60 hopefully.