S12 boost issues

badgerboy · #1 01-12-2008, 11:55

Hi guys,

Finally fitted my cossie intercooler, new plugs gapped at 0.9mm, MBC and setup the standard T2 to run about 10-12psi.

Was pulling really well but now have developed a hesitation at 4.5 to 5k like it's under fuelling but have checked fuel pressure and all within specs.

Car drives normally ok just when you plant it you get this stutter.

Also running on 98 ron fuel and timing is at standard.

Can anyone help as I'm at bit stumped ?

Thanks
Simon

tractor-boy · #2 01-12-2008, 13:29

Air leak somewhere along the air intake? I was having the same problem and traced it down to that.

badgerboy · #3 01-12-2008, 13:31

I'll check the plumbing out when I get a spare minute.

Thanks for the heads up !

Cheers
Si

ChEsTeR · #4 01-12-2008, 14:03

chech the fuel preasure under load. On idle even a dieing pump will have good readings.

northerner · #5 01-12-2008, 14:29

FPR could be maxing out and for that matter the injectors too

tractor-boy · #6 01-12-2008, 15:08

Wouldn't imagine they'd me maxing out at that, could be wrong though. Was running 12-14 psi with a saab intercooler, no other supporting mods and never missed a beat.

badgerboy · #7 01-12-2008, 15:35

Thanks guys I'll check all out when I can and let you know as maybe helpful to someone in future.

Cheers
Si

badgerboy · #8 03-12-2008, 10:36

Hi,

The pipe to the Fuel reg was split so replaced and all ok now.
It goes like sh1t off a shovel !!

Cheers
Simon