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Why Does My Car Boost Spike Running Standard Boost?

brizzi

By brizzi,
in Engines & Forced Induction

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brizzi Collaborator

brizzi

Posted
Posted

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...... :O

paulr33 Grand Master

paulr33

Posted
Posted

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?

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted (edited)

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 :O
Edited by Guilt-Toy
paulr33 Grand Master

paulr33

Posted
Posted

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 Collaborator

brizzi

Posted
  • Author
Posted

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 Veteran

nuffsaid

Posted
Posted
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?

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