I have seen it being posted that when you open up your exaust on a T2 w/a FCD, that that more boost comes unasisted, I have these mods and it's not unasisted unless using a boost controler is considered unasisted

 

with an open exhuast and intake an 87-88 should see 10-15psi. stock is 5.

 

but you need to use a boost controller to get more than the stock 5-6 lbs

 

thats the only way to get 7-15lbs

 

no it's boost creep...

unless your wastegate has been ported alot. you should see 10 or so. unless your turbo is too worn out.

 

just rebuilt turbo, works and responds great and hits 10 instantly, damn near, when set to w/a boost controler, WG un ported

 

do you have a full exhuast? downpipe, no cats?

I just noticed you had an 91 turbo. so tha'll help. should still be hitting 10 or so though. they probably ported it when it was rebuild.

where was that?

 

down pipe no cats, pre silenser, aftermarket muff's, the exaust was done by previous owner but I got the car from a dealer so I don't know brands, T rebuild was done @ Turbo tech in Tacoma WA

 

Should I just either get new exaust eccept the DP so I know what Iv'e got?? But at this point w/out tricking the WG it won't go past 6 pounds. with the BC I get 6lbs in 1st 8 in 2nd 10 in 3+4, the way I currently have it set

 

I wouldn't worry about it...

 

thanks bro

 

Boost creep is not so bad on S5 motors because the turbo has two wastegate flaps that allow more gases to escape when need be.

What size exhaust do you have?

I went to a 2.5inch exhaust with 3 mufflers and no cat, and the boost only raised very slightly. Mine is S5 too, and reasonably quiet.

Do you have a stock intercooler setup or aftermarket? As this can make a difference too.

As Scott 89t2 said, don't worry about it. If your boost controller is giving you your desired levels then just enjoy it.

Warning: Don't forget that more boost requires more fuel or detonation can become a problem. Before you start winding things up too much you should consider some form of aftermarket fuel control.

 

here's all my mods, it's loud *** fu** ( when I want it to be, cruz is fairly quiet)

 

I have a 89 s5 with a APEXi ACV-R set to 12 psi (wastegate not ported) and I don't get and boost creep. I get small spike when shifting. Sounds like you have a nice setup, got any pictures of your intake heatshield?

 

I'll be posting them soon, I just took a sheet of reflective bubble wrap and formed it around my intake and cut a hole behind the radiator so it could breath, noticed hp increase

 

reason for persistance on original ? was I'm unsure of the performance of my MYSTERIOUS EXAUST