I have read conflicting things for a while about using the racing beat turbo back without porting a S5 WG. Some say it will result in a safe 11 psi, some say an engine popping 16psi. I have been told there will be crazy boost creep, and I have also been told it will be just fine.

Can anyone chime in from personal experience and not just some crap they think they heard once?

I have a 90 T2, Rtek 1.5 for the FCD, basic cone filter swap, otherwise un-modded.

 

since you have an S5 the boost creep will be more controllable. you will probably be around 10psi unless you have changed out your TID.

 

Highly depends on the gear, the weather, engine porting, and boost controller. Even with a ported s5 wastegate I once hit 18(!)psi in 3rd when it was colder than 40 F outside. This resulted in audible detonation (RA Super Seals ftw). Mods at the time were 2.5" Greddy PE catless exhaust, manual boost controller, large streetport, Greddy front mount intercooler.

I wouldn't risk it. If you don't port the wastegate, at least put a cat on there to restrict it a little.

 

if you do it, unhook the factory boost solenoid.

my last t2 was, an s4 with s5 turbo, RB turbo back, cone air filter. it would only boost to .4bar, on a cold day maybe it would hit .5 around 4000-5000rpm

WG was totally stock.

same car with an S4 turbo would hit almost 1bar on a cold night in the midrange