Boost Drop?

[Dearlove]

im currrently running 15psi in my gtr atm, had the car for 1 &1/2 or 2 months.

so when i take off it fly's to 15pound in frist and second, so no drama's there

but when i change to 3 or forth it still flies to 15 but straight away drops to 10psi even tho my revs are increasing????

is this right??? cant remember if it was doing this since i had it, only recently started to drve it hard enough to notice...

any help apreciated

thanks, trent

[R31Nismoid]

Id be looking at how your controlling boost. Something might not be right

Could even be a slightly split line perhaps?

[R33GOD]

im having the same problem. done a pressure test and it was perfect.

mine does it in 3rd sometimes and 4th, my boost drops down to 5 psi tho

[jdmser]

I'd be interested in seeing what you guys come up with. I have a rb20 in my s14. I run 15psi on the street and 20psi at the track. I have been noticing that at the track I'll do the same thing. The boost goes up to 20psi in 1st and 2nd. Then in 3rd it hits 20psi once spooled and then starts dropping till it gets to 15psi were it holds.

[Dearlove]

well at least i now know that my car isn't the only one... thank f**k

[jdmser]

What bov and wastegate are you guys using?

[Dearlove]

no idea, going to pull all the intake plumbing out soonish,

so nobody has any idea?

also when im doing 100 and in 5th and floor it it doesn't really make it past 10, just fluctuates round it, like it trying to boost but then cuts off again...