Overboosting

[Guest Robo's]

Im playing around with the Boost controller on my R33 and one day im getting backfires, surges, misses , you name it, as soon as i put the hamer down.

Turn the boost back and then it only surges a little, but goes much better.

Is this boost Cut-off and if so how does it work?

[2fardown]

Gap your spark plugs to 0.8. If you have a 93-94 R33 dont go over 12psi.

[Guest Robo's]

Also i notice, the more your drive it or the warmer it gets, the problem is more noticeable, i guess thats heat soak?

[2fardown]

Possibly....You'll have something to do on the weekend now.

[Sime]

I had the same problem Robo. I was running 12 psi but not hitting the fuel cut. But the power would surge then drop off a couple of times before I hit the red line. This would only happen when the car had been driven for a while. My mechanic put colder plugs in which improved the problem but didn't fix it completely. I dropped the boost down to between 10 and 11 psi and now it goes like a dream.