What boost should an MY98 UK Turbo be producing, in PSI please.

I recently fitted an Autometer PSI Boost gauge to the spare port on the manifold.

The figures im getting are:
Idle: About 20 PSI Vacuum.
Welly: About 8/9 PSI Boost.

Does this sound a little low? Is it the gauge misreading or is it under boosting?

James.

 

James,

I used to have an "Autometer" gauge fitted to my now departed MY97 UK Scoob. I was getting 20psi Vacuum and 15psi peak boost dropping back and holding 12.5/13 psi.

Your figures do appear to be a little on the low side . Could indicate a poorly Turbo, but i'm no expert.

1st thing would be to check all hoses etc. for splits/kinks. If you find Ray Davis, tell him to pi55 off!!! lol. (bad joke)

Cheers
Chris

 

Hmmm thought so.

Mods are Scoobysport centre and backbox and HKS powerflow airfilter (green mushroom). I run on 97 ron and have performed an ECU Reset by disconnecting the battery.

This reading seems to be common to all gears, even when dropping from 3rd to 2nd and booting it.

About a year ago, the car was overboosting. The dealer fixed the problem by fitting a restrictor and stated the car was boosting correctly. I removed the restrictor, but that didnt seem to make any difference to the boost. Looks like the cheeky B***ers dropped the boost in addition to adding the restrictor .

Does anyone have any quick fixes for this or is it back to the dealer time?

James.