A few weeks ago I installed a DASC on my Z3 1.9. At the same time of the initial installation I installed Technique's Tuning stage 3 kit (DME reflash, larger injectors, and 3" MAF). The Stage3 kit does away with the DASC's rising rate fuel pressure regulator since the software allows for larger injectors. The stock boost was fairly low so I installed a 3.6" pulley and now get 9 lbs of boost.
After the installation the car cranked fine, idled fine, and drove great, but just didn't seem very powerful in comparison to other DASC cars I've driven. I dyno'd the car today and found a few issues. Max HP was 164 and torque under 140.
The first dyno pull is shown. On the second dyno pull the car misfired. I haven't felt that on the street, but it certainly showed on the dyno graph. I'm going to pull the plugs and start trying to find the reason for the misfire. I'm running new NGK Iridium IX plugs. They are heat range 7 and gapped at .032".
I scanned the computer and found a fault code for the MAF (code PO100). I cleared the code and it didn't throw the code again on the 5 mile drive home. When I first installed the MAF a few weeks ago I installed it backwards, and I idled the car like that for about five minutes. Maybe that's why the fault code was there. If the code comes back I guess I have a faulty MAF.
I don't think the Technique Tuning software is causing the rich condition since this is the same programming Nick has used on many other cars, but I emailed him to get his input as well.
The dyno operator said that the Mustang dyno they have is conservative compared to some others, so some of the low power numbers could be attributed to that, but it doesn't explain they the car runs so rich up top.
I need to start trying to identify and correct any issues, so please let me know your input. Does anyone have any ideas where I should start?
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