Stock Gts-t R33spikes To 10psi?

[adis]

Hi guys,

I have a pretty stock gtst r33, only mods i have include cat back exaust, filter and apexi cooler. I installed an aftermarket boost gauge and found out that the car runs on 7.5 psi till about 5,000 RPm and then spikes to about 9psi and stops at 10 psi at around 6000+RPM, is this normal, and if not what could cause this?

[MR33SOM]

Hi guys,

I have a pretty stock gtst r33, only mods i have include cat back exaust, filter and apexi cooler. I installed an aftermarket boost gauge and found out that the car runs on 7.5 psi till about 5,000 RPm and then spikes to about 9psi and stops at 10 psi at around 6000+RPM, is this normal, and if not what could cause this?

correct me if im wrong but its the Variable Cam Timing. all RB engines have it apparently or so im told, may be alittle high on the psi side, but certainly nothing to worry about i dont think.

im sure someone with alittle bit more knowledge can clear anything else up.

[RubenR33]

I thought that it was the fact, that if you fit a different intercooler and exhaust and so on, that this will cause the turbo to spin more free, so it will build up more pressure..Correct me if I'm wrong

[lachlanw]

have you even researced enough to know that they have a 2 stage boost control from the factory? 5 psi (wastegate spring pressure) up to 4500 rpm and 7.5 psi above achieved via an ecu activated soleniod. NVCS (VVT) has nothing to do with it really. it will run run more boost all the way through due to exhaust and I/C upgrades. less restriction in exhaust =turbo goes faster. and less restrictive I/C makes has obvious benefits.

it is quite safe to run it like this

[RubenR33]

That was exactly what I thought

[adis]

Well i wasnt sure if it was normal so thought id ask. Thank you for all that bothered to reply

In any case, i installed a "turbotech" boost controller, and now it sits on 11 the whole way through the revs. Pretty happy now.