ok i have a stock 89 tII, the only mods are the cats are cleaned out, a cat back, and a slight air box mod...drilled holes in it with a k&n filter. what is the stock boost my car should make, right now on my autometer boost gauge i get about 18 to 8.5 on vaccume and about 6 to 6.5 on boost. what is stck amounts???btw it is a JDM motor too.

 

stock is 8psi. if you are getting less then 8 then the factory boost controller is not working or not hooked up.

I wouldn't run more then 8 untill you get a bigger fuel pump and / or pump rewire

 

so you should get a solid 8psi when you stomp the gas in like 5th gear doing 70.... where is the stock boost controller. oh yea someone told me i need to run 92 onctane right now... do i?

 

Run the highest octane you can. It's for safety. 8psi is around what you should get.

 

where is the boost controller

 

anybody???

 

Its on the other end of one of the lines that come off the TID.

I thought stock boost was 5.5 for S4s, and S5s had the same wastegate spring, but the boost conroller would only raise it to 7-7.5.

I have a S5 that will have a full exhaust, intake, and posted wastegate. I have a walbro fuel pump sitting next to the car right now, and I was going to take off the stock boost conroller and run a cheap ball and spring MBC.

Fuel cut is at 8.6psi, so you'll want a FCD if you plan to get close to that, also the stock ECU doesn't have good timing maps for above fuel cut, so I wouldn't go much above it until you can get your timming pulled back a little.

I was going to try to run just under fuel cut with my rewired walbro, untill I can save up enough for a mircotech, then, the sky is the limit.

 

thanx a lot. now i have sopmething to work on this weekend