Boost Valve

J

Johnny Bravo

New member
Hi everyone,

I have a question regarding my boost valve. I have a RPM stage 2 turbo and I am using a boostvalve to controll the boost with the internal waste gate provided with the RPM turbo. The boost valve works fine until I go over 20psi. At 19 psi, my boost is solid and stays @ 19psi. However, when I turn the boost up to 20 or more, I get a very inconsistant boost pressure. My boost may stay @ 21 psi and surge up and down between 21-23 psi. It kind of spikes up and down and I can feel it while driving the car. I can feel the boost spikes when I"m running through the rpms. I have zero KR via datamaster, afr - 11.0/1. What could be causing the surger over 20psi? I purchased the boost valve used so I wonder if the springs are warn? I"ve no ider of what's casuing the surge. It only happens when I adjust my boost pressure over 20 psi.
 
Big Mike

Big Mike

New member
Re: Boost Valve

There are different springs available for your boost valve check their web site i think you may want to contact them too after all it is their product.
 
turbodig

turbodig

Active member
Re: Boost Valve

Tighten the rod (shorten) on the wastegate canister... the flapper in the housing is blowing open once you get enough backpressure pre-turbo.

You'll need to adjust the boost valve down a bit once you do this.

It may well be that you need a stronger WG canister, but adjust the rod first to check.
 
J

Johnny Bravo

New member
Re: Boost Valve

Thank you Turbodig!!!:tup:

I've got rock solid boost @ 23psi, no bouncing on the boost gauge at all!!!:tup:

Two turns in on my internal waste-gate rod and I"m good:D
 
J

Johnny Bravo

New member
Re: Boost Valve

Yes, I am spraying alky with 94 octane fuel. I usually run my boost on the street @ 21psi with little to no KR. I figure once I take her to the track, I'll use some race fuel and turn up the boost a bit. Thank you for your help:tup:
 
Aeroking

Aeroking

e.i.
Re: Boost Valve

you can usually pickup a couple more psi of control by using the vacuum ports on the intake as a boost reference over using the port on the compressor. Since there is a pressure drop between the turbo and the intake, depending on which IC you run.

But the standard boostvalve spring is only rated for around 22psi. They sell an upgraded spring for higher boost.
 
ZavzTy547

ZavzTy547

Senior Member
Re: Boost Valve

Aeroking said:
you can usually pickup a couple more psi of control by using the vacuum ports on the intake as a boost reference over using the port on the compressor. Since there is a pressure drop between the turbo and the intake, depending on which IC you run.

But the standard boostvalve spring is only rated for around 22psi. They sell an upgraded spring for higher boost.
Click to expand...

Are you running code 58 or 59?
To be on the safe side, adjust the table for boost/fuel cut off, just in case you overboost.Great safety feature when your running moocho high boost.
 
Aeroking

Aeroking

e.i.
Re: Boost Valve

ZavzTy547 said:
Are you running code 58 or 59?
To be on the safe side, adjust the table for boost/fuel cut off, just in case you overboost.Great safety feature when your running moocho high boost.
Click to expand...

if he's using a boostvalve then he's not using the factory boost solenoid and therefore cannot set a boost cutoff, only a fuel cutoff, which would lean the motor in high boost. i'd set the spark cutoff, and turn the fuel up in high boost to be safe while your playing with the boost controller.
 
ZavzTy547

ZavzTy547

Senior Member
Re: Boost Valve

Aeroking said:
if he's using a boostvalve then he's not using the factory boost solenoid and therefore cannot set a boost cutoff, only a fuel cutoff, which would lean the motor in high boost. i'd set the spark cutoff, and turn the fuel up in high boost to be safe while your playing with the boost controller.
Click to expand...

Aeroking, Doesn't the boost cut off table lower the timing and spark, in a overboost condition with or without the stock solenoid? Or does it just cut fuel? Dig feel free to chime inn...

Wonder if anyone used the factory boost solenoid as a safety feature, in series with a boost valve (probably overkill)..

I have the RPM stage 3 turbo and could never control boost over 20psi with the stock solenoid and code 59, no matter how I tried to F with the tables. Similiar issue with the boost valve over 20psi but the valve is just easier to dial in (solid boost under 18psi).

It's good to hear that Johnny Bravo got his over boost worked out. Sounds like I need to adjust the waste gate rod.
 
You must log in or register to reply here.
Top