Safest boost pressure?? urgent!!
 

i own a sti ver8 and i need to know wat is the maximum/optimum boost pressure my car can take ..without causing too much damage or result in a overboost condition.. also i will be installing a hks EVC 5 next week .. so i need to know the boost pressure preferably in bar.. thanx a bunch

i run 12psi, which i think is only 1bar

1 bar = 14.7 psi

sti? until 1.2 i think is very safe. Recomend oil cooler instalation if u pretendo long full boosts runs on it...

hmm up to 1.2 bar .. ok then.. oil cooler?? oh no almost dead broke from all my current mods hehe.. alrite guys thanx a bunch

hmm up to 1.2 bar .. ok then.. oil cooler?? oh no almost dead broke from all my current mods hehe.. alrite guys thanx a bunch .. cuz the thing is i changed my stock downpipe to a 3" downpipe ... removed the cat converter.. changing my 3" greddy / TRUST exhaust system to a NO bullet 3 " all the way straight flow blitz Nur Spec R one together with the EVC hehe i was told there would be a boost spike or creep.. so that y i went out of my budget to get a boost controller... so i was thinking while i was at it might as well get a good one which was the hks EVC 5.. need to awaken the BOXER within my car hehe

why not just add a little extra cash to the boosr controller and get the car mapped. much safer and much better

i thought STIs will take 1.5 bar all day??

my cars mapped to 1.4 and its only a WRX.....its perfectly happy :)

Your car is mapped, therefore will have fuelling/timing altered to suit - just upping the boost (as I believe the poster is intending to do) without altering fuelling/timing will lead to leaner running, and if the boost is upped to much, ultimately a fubarred engine!

With a Dawes....I think on wrx is safe to boost until 1.15 1.20, and sti 1.3 1.35 (from "historical data") without remaps. Heat is your big enemy when pumping up pressure. (so the recomendation of an oil cooler that subaru shamely lacks, proper cooling procedures after a full boost run because turbo WILL BE HOTTER, frequently oil changes, good oil like motul, etcetcetc)


And do remember that stock ecu compensate for the extra pressure, and AFR is always on 11.1 at WOT (1.20 Dawes - 0.95 stock) . It doesnt run leaner, thats a myth. But this is only true for 10% 20% more boost, if u get greedy u better feel lucky ;)
A proper remap is a must if u plan to go further on the boost road!

Whats the standard pressure for MY05 STI ? & MY05 STI PPP ?
mine is the latter and it peaks at about 18 PSI and drops back to a solid 15PSI that's 1.22 bar peak isn't that low then ?

hmm...too much money spent on current mods hehe i guess i'll just set the boost to bar or 1.1 bar at most hehe run safely for now.. i actually dont wanna boost it up yet i just need a boost controller to make sure with all the straight flowing done there isnt a boost spike thats all ehhe.. just checked out the evc today looks goodt too hehe cant wait till next week hehe my car will come alive!!

not sure if agree with the recommmendation of an oil cooler. Cant see a lightly modded 2.0 producing high enough temps to warrant it. Also oil coolers have their downsides.

IMO, save your money with a fancy boost controller and fit a cheap and effective dawes device. Put the money from the fancy boost controller towards a re-map, which can be had for very reasonable money nowadays.


Bob

Mines A WRX to and running 1.4 and runs perfect.
What BHP is your mate?

Depends on other mods but on the later cars between 270-300 with the right bolt on mods..!;) (and dyno of course)