i have a hallman mbc and its set around 19psi but if you get on the throttle in 4th or 5th it spikes up!! I was doin some reading on here and realized i removed the hose with the restrictor pill.. Would that may it spike or is it just the mbc??

 

what is it spiking to, you will make more boost in 4th and 5th gear.

 

around 25psi+ but id let of immediatly

 

Turn your boost controller down till ur boosting where you wanna in 4th gear, that is when your puting a load on your turbo.

 

I have done that. I was asking what is causing it.MBC was adjusted to boost in 3rd gear as its supposed to and is still spiking under heavy load in 4th or 5th.

 

may sound dumb but did you mount your controller backwards?

 

No...why

 

when my buddy bought his car, the PO installed it backwards and it did the same thing.

 

set the boost in 4th. The spike man...it happens either turn the boost down or drive around it.

 

X2, Like i stated before.

 

You SHOULD remove the entire factory boost/vacuum hose assembly leaving the factory boost control solenoid(BCS) out of the loop although with its electrical connector plugged in.

As others have pointed out to you, it is advisable to set boost in either 4th or 5th, and not 3rd gear. This is due to the fact that the engine revolutions will wind out faster than the turbo has a chance to spool in third gear. If you want to mitigate the overboost/creep issue in top gear, then set boost in 4th or 5th, not third.

 

Thanx. Turns out it was a pinched vacuum line... Doesnt peak in 4th or5th anymore.

 

watch out this is how you blow motors, I know, thats why I went Electronic. Peace of mind.