hi, i own an sti v3 wagon 1997 and i've been told that boost is normally 1.15bar, but mine's does max boost 1.4bar and continious 1.15bar. i've checked the ECU with a mate who's engineer if it was chipped but the ECU is totally stock!
the only thing i've seen is that the exhaust is an Fujitsubo 3" s/s cat back.
can any1 tell me if is it normal to have that boost (car runs very fine, allways use v-power, here in Belgium and Germany is 100ron).
thanks
Daniel

 

Hi, 1.1 sounds too much for standard and if it's spiking at 1.4 then my guess is you have a bleed valve on there (have a look to see if your boost solenoid has been bypassed.

 

how to check if there's a bleed valve (i'm no techie so don't know nothing), how do i know it's bypassed?

 

does anyone can help with that?

 

look under the bonnet at the drivers side strut tower, on the side there should be a cylindrical shape solenoid with 2 or 3 pipes coming off it, (or maybe no pipes coming off in your case)

hope this helps.....hard to explain

 

http://i69.photobucket.com/albums/i7..._day_20017.jpg

just found this pic,

if you look just left of the air filter you can see 2 blue pipes close together, in between those pipes you can see the boost solenoid (cylinder shape)

check/trace pipework from there (if any)

(yours will look slighlty different from this pic as that one has a apexi solenoid on as well, but don't worry about that)

 

thanks for the pic!
i've checked under the hood and found the boost solenoid, and yes there's 2 rubber pipes going out the valve, one going to the T and the other one to the cylinder head block (i think it's that).
so now, why i still have this boost???

 

nobody can answer??
any big tuner overthere can help me with this??
thanks

 

help help!!! can anyone help me

 

My STI 3 behaves exactly the same. Peaking at just under 1.4 in colder weather and settling at 1.1 - according to the gauge at least.

 

How your car does feel? mine's very strong push all the revs without any hesitations or cuts.
a lot of people around here think that's not normal for a stock ECU but that's the way it is!!
i'm going in about 2 weeks to do a dyno sesion to check power/torque.
i'll tell what about.
cheers mate

 

Can't tell you why your car is boosting to 1.4bar but can tell you that I ran a MY97 STi with Blitz boost controller set at 1.3bar. Had it checked out for fuelling, det, etc and no probs. Ran it like that for 40k before selling on. 1.4bar may be pushing it?! I think '911' who posts on here had a version 3 running high boost - he is probably more equipped to answer.
Can't remember where fuel cut is set on these? 1.5bar?

 

my 97 type r over boosts to 1.4 bar then goes back to 1.1 bar with my foot down.... well once again thats according to the blitz gauge and its standard

 

you've changed the exhaust hence reducing the back pressure - this means the turbo is spinning more and makes boost before the ECU notices and reins it back to what it should be. It is spiking in other words and needs a remap to smooth it off and get the best from it.

 

Yep, same as yours. Mine is totally standard including exhaust. Feels great but I can't fully enjoy it until I'm sure something isn't going to go pop. No sign of boost cut.

I should add that my gauge is in kg/cm2 so 1.4 = 1.37bar, plus it is possible for gauges to read over by a little, I'm told. The point where the reading is taken may also be a factor. I think mine is T'd off from the MAP sensor line from the inlet manifold, although I haven't looked too closely at it.

 

hi mate, did you changed the exhaust?
it looks like a lot of people owning sti v3 1997 does have the same boost behavior!
do you feel the car running bad?

 

mine's just have a fujitsubo 3" exhaust and the boost gauge is the original lemco one, don't know from where is reading.
anyway i tryed the car pushing it a bit hard at the Nurburgring a few weeks ago and the car still running very fine.
i've changed the oil for castrol 10w60 much better protection.
i just damaged my rear bumpers!!
next week will fit sti red ones.

 

I just got the car and feels right to me but then i have no previous experience lol

Exhaust is standard i think, says sti on tail pipe if thats standard......

 

sti on tail pipe means original exhaust , but still not an explanation on how boost goes to 1.4 and stays at 1.1 constant???
we've to found a good tuners able to answer us!

 

so, does any great tuner can give some kind of explanation about this thread??