Boost Problem!!!

[supra]

My R33 Gtst is hitting Hi boost every time I step on it hard. And I mean straight away!

I have no boost controller yet.

It's stock exept a Apexi Pod Filter, Turbo back exhuast.

This is what the car like before I declared it's troubling!

The car will be at 5psi boost from 1000 to 4000RPM then goes to 8psi boost.

This happens during the whole 3rd and 4th gear, when the foot is lay down!

NOW, the foot lays down, 1 sec of turbo lag and the rest is at about 8psi boost and drops back alittle and on it again. The revs go from 2000 to instantly 4000rpm and down to 3000 and go normally up...

I thought it was the wheel spinning, but nope, not that!

I resetted ECU, yes, it helped for a day!

I resetted it because there was a leaking hose to the boost gauge, was like that for a week till I got it fixed. so i think the ecu has learned it self a wrong setting of the car. reset done now.

What is happening? is my O2 sensor broken? ecu farking up? or boost valve gone?

help!!! thanks people!

[Trust33]

That sounds to me like your clutch is slipping.. ((The revs go from 2000 to instantly 4000rpm and down to 3000 and go normally up))...It slips making it rev high faster then it grabs forcing the engine to loose revs....

Yep it sounds like a clutch to me.but what you said about the computer, i dont think it would be right.The reason being you computer doesnt controll the revs of your car your foot does.Think about it what else can controll the revs with such ease and take them away..Maybe your actuator no i dont think so though??I dont know if a sensor would do that!i doubt it.But it sounds like the behavior of a worn clutch.How long have you had the car for?

good luckske's....

[supra]

i seriously don't know how long the clutch has been with the car! I got the car a bit over 8 months now! my mechanic once said the clucth when new should grab when release the foot for a little bit. mine is like have to release like 80%! is that another sign of a worn clutch! fark, I have to falk another $500 out? any one know places with cheap clutch!

[Trust33]

Where is the clutch grab point?20%40%60%80%...my scale is 20%near floor..100% all the way out.

[supra]

80% , fark, sounds like my clutch is dead! how much are replacements? self doable?

[Trust33]

Yea theyre ''self do-able'' a 2 person job.But i would only be doing it with someone who has done this sort of thing b4.Seen one seen them all.Or if you never have,pay someone to do it for you.The only hard part about it for me was tilting the engine to gain access to top bolt then.Box down and box up to slide the spline back in.

[supra]

the only problem now is why the boost is set to go off to HI all the time? Slipping clutch making this ?

[Trust33]

what do you have an ebc or a bleed valve????

[Trust33]

I got my ceramic puc h/d sprung button clutch for $450..about 5 months ago.Could be exhaust manifold gasket leaking letting excess gases escape causing it to boost.Just see what your mechanic says.

[supra]

man, that's cheap! every where is selling for $550 or more

where did you hunt that down? please let me know!

[supra]

standard is around $250... but if i replace, why bloody not?

[paulr33]

02 sensor wont cause that if its dead. a busted 02 sensor will just most likely make your car use heaps of fuel.

[LOW25T]

try and do a burnout bro, that will let u know if it's ur clutch

[Trust33]

man, that's cheap! every where is selling for $550 or more

where did you hunt that down? please let me know!

Matins clutch and brake U3,13 blaxland rd,campbelltown 2560 Tel:02 46281177.

i had to take the old one to swap over though otherwise i would have had to pay $550 to buy it outright.

[Trust33]

I got my ceramic puc h/d sprung button clutch for $450..about 5 months ago.Could be exhaust manifold gasket leaking letting excess gases escape causing it to boost.Just see what your mechanic says.

[supra]

LOW25T: I don't know how to! LOL, and if I do, how would I tell the differnce! Every time I try to do a stand still burn out, my car just rocket forward! LOL...

Trust33: Thanks for the info, very very useful! but do they do the swap over as in they have a workshop there or they are just stock exchange warehouse.

[Trust33]

Their workshop only consists of lathes and things to do with clutch reco.They are just stock exchange warehouse.

[Trust33]

Their workshop only consists of lathes and things to do with clutch reco.They are just stock exchange warehouse.I think!!!

[Trust33]

Their workshop only consists of lathes and things to do with clutch reco.They are just stock exchange warehouse.I think!!!Good luck with it anyway mate.

[Chef_32]

I was under the impression that there is a stock solenoid which regulated the boost in such a way that the boost will display characteristics as you mentioned holding at 5 psi for a while then jumps to 7-8psi later.

The revs are probably your clutch slipping though. Rb25det gearboxes are apparently really heavy, might not be a good idea to do yourself unless you got a hoist. My friends have had HD organic Exedy clutches installed for $800ish.