Why Does My Car Boost Spike Running Standard Boost?

[brizzi]

Hi just wondering if anyone knows? Why does this stupid neo rb25 which i am begining to hate, boost spike to 12psi on full throttle,then it climbs to 15 psi then starts shaking the whole car (only night time late,and early mornings) i know the air is colder and more dense. And during the arvo it holds 8psi constant under full throttle. Everything is stock! hoses,boost valve everything......

[paulr33]

something is leaking or not correct for it to spike that much

the stock actuator wont allow it to hold that much pressure

i would suggest checking all the hoses and tubes

what exhaust?

[brizzi]

3 inch exhaust, split dump pipe, and a ultra ultra high flow cat

[Guilt-Toy]

That would be why.. its flowing more in the dense times...

I would suggest a upgraded actuator and then a decent boost controller to fix the issue.. try one of those cheap ones they are going on about here.. the turbo tech. you would be suprised.

3 inch exhaust, split dump pipe, and a ultra ultra high flow cat

Edited August 22, 2006 by Guilt-Toy

[paulr33]

well thats why its spking

youve taken away the exhaust restriction so now its easier for the engine to flow exhaust, which in turn drives the turbine faster, which makes more boost and makes it spike. i would suggest a good electronic boost controller. one that can only close based on whatever preset pressure is.

[brizzi]

Thanx fellas! I have been tearing my hair out! I would much rather my old series one rb25! use to run 12 pound all day every day not a drama! Neo rb25 very overated! for example 9-10 psi boost cut, turbo is a crappy laggy nylon one!

[nuffsaid]

well thats why its spking

youve taken away the exhaust restriction so now its easier for the engine to flow exhaust, which in turn drives the turbine faster, which makes more boost and makes it spike. i would suggest a good electronic boost controller. one that can only close based on whatever preset pressure is.

What are some EBCs you recommend (one with an accurate boost in psi reading would be good)

Blitz SBD-ID3?

Profec B?

AVCR?

[paulr33]

hks evc

[nuffsaid]

hks evc

WIll the Blitz SBC-ID3 do the same job? Id much prefer that, cheaper than the HKS EVC 4

[paulr33]

not sure sorry. i have the older hks evc 3 and it works great

set boost and thats all you need to do. no need for fancy screen and crap