R34 Gtt Stock Boost

[BLUELINER]

just wanted to know what boost stock r34 gtt's run. does anybody know?

[Primordial]

Maybe try asking in the Forced Induction section...

I'm guessing between 7 and 9 psi

[Howie]

it's dual stage.. 5psi and 7psi from memory.

[jonjon]

i believe it's 4psi and ups to 7psi over 3500rpm

[Abo Bob]

umm 19... I can't remember but I thought it was just 7psi the whole time.

[Howie]

Nah abo_bob, it's dually unless you ground the negative wire on the boost solenoid.

[Beer Baron]

asked and answered and moved to FI.

[so_tred]

I've never heard of this whole dual boost?

asking a stupid question: do you notice the difference if you put it up to 7psi all the time? (EBC or other ways)

Edited January 8, 2007 by so_tred

[Howie]

Here you go mate. Big thread on it here.

HOWTO: RB25DET High Boost mode with standard solenoid

Edited January 8, 2007 by Howie

[Primordial]

It would depend on your level of mods.. if it's capable of flowing enough to make 7psi lower in the rev range, then yes - you would feel the difference. Otherwise a restrictive exhaust would probably make it impossible to make any more boost than 5psi up to 3500rpm.

edit - reports from that thread just posted say that yeah you do in fact feel the difference. I guess a thread wouldnt have been made about it otherwise

[Howie]

asking a stupid question: do you notice the difference if you put it up to 7psi all the time? (EBC or other ways)

Yep your fuel consumption goes up Well it did for me. But in terms of performance, you do notice it right off the line. It's only for a split second or so before you get over the 3500rpm line.. but you can see it more clearly on a dyno. With mine.. on the dyno you see a distinct spike with the dual stage, and it's flatter with it disabled.

[so_tred]

I can't believe I've been in the dark about this

I'm gonna have a look at doing that howto sometime very soon..

[666DAN]

The ECU in the R34's up the boost when, quote, from the R34 manual "the engine is raced"

The R33 had a pre-determined rev point where they changed, we don't have that.

[RANDY]

so tred: I bought the $22 (cost more than that now) boost controller to achieve 7psi. I beleive the stock solanoid constantly "bleeds" some pressure out to the wastegate, so it takes a bit longer to build it up.

Using the manual "ball and spring" controller made a HUGE difference for me. No extra fuel usage, but much more stable and constant boost. I ran 7psi with a completely stock setup, and i'm now running 8psi with just a split dump and 3" cat.

It's a "must do" thing, I beleive.