This might be long-winded, so bear with me a bit.
I recently bought a j-spec auto TT and almost immediately took it up to CW to have some work done on it. On the way up to Chris' place, the car was boosting to 1.27ish even on relatively short runs, in the height of the summer. I took the car out this morning and even up a slight hill, in third, on a cool morning, it will only hit 1.02. I'm using the DBSCs peak hold feature to assess boost. I'm using the same fuel (optimax).
Now this sounds like a complaint, but it really isn't: the car seems every bit as quick, if not quicker, than before the work was done. I don't have very much to compare it to other than my lardy UK TT, but to me it seems ferocious at 60mph plus. I don't have any acceleration figures to back this up, but CW confirms that the car pulls 'very strongly'.
Pre CW mods were: Hybrid turbos (approx UK spec), Blitz induction, full decat nur spec (3" downpipe), Blitz Access ECU, Blitz DSBC (an earlier one).
CW swapped the Blitz Access ECU for a stock one, added a TRL FCD, swapped the 3" downpipe for 2.5" ones, added a FMIC and water injection.
I seem to remember Ian Chisolm posting that he attained better acceleration with less boost (using a restrictor ring), which I think he attributed to increased engine efficiency due to lower EGTs?
So, my questions are:
1) Why only 1 bar, when others with the same spec are hitting 1.2 plus? The boost controller is set to 70%. Is the downpipe the restricting factor? Or could it be something else?
2) On local roads, there is nowhere that I can floor it for more than 5-8 seconds in third... I run out of road. Perhaps to attain higher boost needs longer?....Though it used to instantly hit high boost, or so it seemed.
3) Can the car really be faster, despite a 20% plus decline in peak boost? If so, great! No point in stressing the engine more than necessary.
Any thoughts?
regards,
Cliff