My boost gauge is showing almost no boost (maybe about 5lbs at max) when the turbo kicks in, but I can fell the boost, and it feels good???? Is this just the gauge? Has anyone else experienced this?

-89 Turbo II....thanks everyone

 

well is everything stock? Isn't stock boost 6psi?

 

I thought stock was about 10lbs.?.?.

 

Uh-uh. The ECU has a fuel cut set for 8lbs, you have to get a FCD or a standalone to get any higher than that!

 

these gauges are getting to be 20 years old and arent that accurate to begin with. i suggest you install a nice greddy or hks boost gauge.

 

Are you reading that on an aftermarket gauge? 5psi is way more than "almost no boost" and will give a considerable performance improvement over no boost at all. However your S5 should be running ~8psi boost stock, so something isn't quite right.

Do you still have stock cats? If so, there's the problem. If not, without some more info (mods, condition, other symptoms) we're just guessing.

 

Yeah, I atually still have the stock exhaust, other than the mufflers....Thanks a lot for the input. Exhaust is on my list of things to do. How much horsepower can you expect from a full aftermarket exhaust sytem?? What is a good system that you would recomend?

 

Search

 

port the wastegate or youll have mad boost creep with a full exhaust...im sure you would have searched and found this info out on your own though

 

Definitely port the wastegate. That is the ONLY way to stop boost creep, which WILL happen! A full exhaust system should yield you upwards at least 30+ hp (I'm being conservative.)

 

Racing Beat claims 60hp from their turbo-back, but of course most of that power is from the boost increase that you will see.

 

Thanks for all the responces!! I do search but also like to get the opinions of the true experts, people who own and are passionate about there RX7's...