We are using the wastegate spring to regulate boost.
We had the wastegate hooked up to the nipple on the turbo.
We were seeing 4psi.
Took the vacuum line off the turbo and connected it to the brake booster.
The car is now seeing 6psi.

Questions:

1) Is that ok

2) Show we cap off the nipple on the compressor housing?

Thanks.

 

same thing with me....vac hooked to turbo nipple i saw 6psi...with it hooked to the intake mani i saw 9psi....i felt stronger at 6psi though......i think you are safe though 6psi isnt that much boost

do you have the .45 spring

 

you lose psi through the i/c!
so having it off the turbo blows goats!
having after the tb is the place of choice because now youll be seeing 6 psi in your motor and not just before the i/c!
you made a good and smart move

and yes i would cap off that hole.

 

Sounds pretty smart to me.

" The life of the vaccum sytem "

 

no matter how much pressure drop you have the wastegate wont see it becasue it is reading how much boost is at the intake manifold

 

not when he had it reading off of the turbo outlet!

 

So we made the right move. Thanks guys.

 

pressure at the turbo outlet will be completely different than what is seen in the intake manifold, that is why you want to tee your boost source off the manifold, because the intercooler etc. ( or lack of) will cause pressure variances in front of the TB giving incorrect pressure to the wastegate.

 

Would the whole idea of the pressure variances before the throttle body also apply to using a boost source for an electronic boost controller? I'm referring to the profec b for example, would it be better to get the boost source for the controllers solenoid by tapping a charge pipe before the tb or just running it off the intake manifold? I've searched through all the profec b topics and it is still unclear as to what will absolutely work.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by highmilehatch &raquo;</TD></TR><TR><TD CLASS="quote">Would the whole idea of the pressure variances before the throttle body also apply to using a boost source for an electronic boost controller? I'm referring to the profec b for example, would it be better to get the boost source for the controllers solenoid by tapping a charge pipe before the tb or just running it off the intake manifold? I've searched through all the profec b topics and it is still unclear as to what will absolutely work.</TD></TR></TABLE>

Up for your question.

 

just use something behind the tb to be sure, (dont you use the w/g anyways...sorry i dont have a boost controler)so if your using the w/g just make sure its behind the tb.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by highmilehatch &raquo;</TD></TR><TR><TD CLASS="quote">Would the whole idea of the pressure variances before the throttle body also apply to using a boost source for an electronic boost controller? I'm referring to the profec b for example, would it be better to get the boost source for the controllers solenoid by tapping a charge pipe before the tb or just running it off the intake manifold? </TD></TR></TABLE>

It's basically a tradeoff. The plus from getting the vac/boost source off the intake manifold is you can see (using your guage) and also you'll be controlling boost with the exact psi the engine is "seeing". The drawback is a slightly delayed response time from the boost controller, which can aggrivate boost spike problems if your wastegate setup isn't up to par.

Ryan P.

 

I'm running the greddy kit on my sohc and I T'd off the wastegate and ran a vacuum line to the nipple on my bov that reads atmosphere pressure. I did this to eliminate any turbo shutter in between shifts. Now the car runs about 8-9 psi instead of 6. Whats the reason for this?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by highmilehatch &raquo;</TD></TR><TR><TD CLASS="quote">Would the whole idea of the pressure variances before the throttle body also apply to using a boost source for an electronic boost controller? I'm referring to the profec b for example, would it be better to get the boost source for the controllers solenoid by tapping a charge pipe before the tb or just running it off the intake manifold? I've searched through all the profec b topics and it is still unclear as to what will absolutely work.</TD></TR></TABLE>

Keep searchin' The solenoid would read from both the intake mani. and the charge pipe before the TB.

For the Profec B Bottom w/g nipple goes to the intake mani. A line from the intake mani, goes to the back of the boost controller unit(1). Charge pipe nipple goes to the solenoid (2). Top w/g nipple goes to the solenoid (3).




For the Profec A , (1) would go to the solenoid instead of the boost controller unit.