I think i am overboosting and getting boost cut out. At peak boost it hits 1.25 bar and then cuts, i have done all the usual checks, leaks, clean hoses etc but cannot cure it. any ideas?
By the way the car is a 2000 type RA, full decat and HKS induction.

Also can anyone sugest a good place to get it checked out in the southend area essex

 

It sounds like Fuel Cut to me mate, and possibly needs a remap too.

Wait on some of the pro's to give you some more info though.

Goodluck

 

why would it be fuel cut? Is this linked to the overboost?

 

if it overbbosts beyond the fuel cut limit it will then give an abrupt fuel cut like killing the ignition for about 1/4 of a second - not nice!

The full decat is probably your root cause as that changes the optimal BCS control strategy and on some VF turbo's can give rise to 'boost creep' where the wastegate can't flow enough to keep boost under control.

If its the former, you can cur it by fittinga restrictor in the pipe from the BCS to the intake pipe, for 1.2 bar you will need an orifice of about 1.6mm usually....

Just to confirm you haven't replaced your BCS pipework with silicon hosing, this is slightly larger bore and smoother so flows better than the original stuff, this can then lead to transient overboosting on an otherwise totally stock car.

Simon

 

Good chance it could be the freezing weather if you have not changed anything and it never did it before this cold snap.

 

i have had the problem for some time now and lived with it but its really pi$$ing me of now. It started after i had the inlet pie changed as the old one had started to fall apart, all standard parts were used and then the MAF sensor went about a week later. It went away for a while and has now come back to haunt me.