Help: New Turbo=Boost Cut...i think

[SeriesIIGTST]

Hi all,

Well, after just installing my 2535, WOOHOO Spools up lightning quick, and goes smoother and harder than old turbo at sensible boost (say 0.6 bar). However, wind Mr boost up with my EBC to say 0.85 bar or more and she starts to jerk considerably. Could this be boost cut with my AFM maxing out? It does come on like a train, however, I know a lot of you are running good numbers with stock AFM and not having this problem. Plugs? A/F ratios? suggestions?

I'll definitely be visiting a tuning house soon for an SAFCII tune in the very near future.

Cheers all!

Dave

[GTS-t VSPEC]

If it's a real hard cut, then probably boost cut, but could be plug breakdown. What gaps are on your plugs? Best to get it to a dyno ASAP, just to make sure the AFR's are ok.

[SeriesIIGTST]

Thanks Paul.

I woulda put money on the fact that you'd be first to reply. Unsure of the gap of my plugs. I'm running those NGK's with the three prongs rather than just the one. Dunno? It's not a real hard cut rather a repetitive breakdown, what i'd imagine to be plugs. Low boost is fine but the higher boost (and lets face it, we all want higher boost) it becomes problematic.

Oh well. I've been meaning to get down to SST for a tune anyway. Should I book or can i just rock up on a saturday morning and try and get a tune? Weekdays are no good for me at all.

Cheers!

[jmp]

I'd say you would have to book as SST seem quite busy.

[GTS-t VSPEC]

Dave, Definately book, as weekends are always the busiest. We can put it on the dyno, see what's happening, and if it's plugs then we can change it then and there:D

[SeriesIIGTST]

booked in for next saturday (3rd of April). May change plugs before then to see what happens. For now, it looks like I'll have to make do with low boost cruising (not necessarily a bad thing). Thanks.

[DCIEVE]

just do the plugs first, with a small gap id say the problem will be gone

[rob77]

Boost/fuel cut... if it was the plugs wouldnt it misfire?

[DCIEVE]

he said its not a hard cut, more like a repetitive breakdown. the plugs are worth a try, if it doesnt fix the problem get it checked out. Then again i wouldnt want to put too much boost through it if it hasnt been tuned with the the new turbs anyway