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Quick boost rising question

chrissso

By chrissso,
in Engines & Forced Induction

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chrissso Proficient

chrissso

Posted
Posted

Hi All, Just got a quick question.

First of all, I have an r33 with a rb25t with following mods.

turbo dump pipe and 3" exhaust, fmic.

Please note that the boost solenoid is NOT connected.

When I open the throttle, Boost comes up to 5PSI at 2200rpm and then increase gradually throughout the rev range to about 10 PSI at 6000rpm.

I was wondering if this is normal for the mods that I have. Does anyone else have this?

Your input would be appreciated as I'm trying to find out if this is normal or my actuator is buggered or will only open so far, etc.

Thanks...

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Dee 33 Community Regular

Dee 33

Posted
Posted

I beleive with no form of boost control your cars boost will gradually rise as the revs go up.

When I got all my mods done, one of which included a bleed valve, I noticed that the car would boost up to about 9psi and then gradually creep to 14psi once I hit about 7000rpm. I later discovered that the reason this was happening was that the workshop (for some reason or another) had decided to leave the bleed valve completely closed which left me with no boost controlling device and only the wastegate (internal) to work things out.

If you installed a bleed valve, you would be able to get that boost to jump up to 10psi (or more) by 2500rpm. The fact you have no solenoid is my guess as to why this is happening.

chrissso Proficient

chrissso

Posted
  • Author
Posted
I beleive with no form of boost control your cars boost will gradually rise as the revs go up.

When I got all my mods done, one of which included a bleed valve, I noticed that the car would boost up to about 9psi and then gradually creep to 14psi once I hit about 7000rpm. I later discovered that the reason this was happening was that the workshop (for some reason or another) had decided to leave the bleed valve completely closed which left me with no boost controlling device and only the wastegate (internal) to work things out.

If you installed a bleed valve, you would be able to get that boost to jump up to 10psi (or more) by 2500rpm. The fact you have no solenoid is my guess as to why this is happening.

Hey D 33,

did you find that when you sorted your bleed valve issue that boost when straight to 10PSI and then stayed there for the rest of the rev range?

I fitted one of simarks turbotechs and found that it increased boost from 5-10 psi to 8-13 PSI. Still had the boost rising problem though, just higher up now...

Has anyone fixed this issue. From D33's post it seems that it is.

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