1999-2009 [Subscribe to Daily Digest] |
I agree it is overboard but has to be considered when tuning above 300hp. If your goal is not over 300hp, then don't worry about it. I don't agree that the piston issues are limited to stock ECU's. Ask Steve about his Stage 3 Viggen with a new motor and I'm sure he would agree with me.
Abbott's intercooler has received much praise for quality and ease of installation. It is currently available for around $1000. Front mount intercoolers are a simple install that does not require removing the stock intercooler. You simply remove the bumper cover, bolt the IC to the bottom of the bumper and run some piping. I am still trying to get the exact details of the piping requirements from some who have done the FMIC install but overall it is quite simple and can be done for less than $500. Not bad IMO.
I don't believe that there is much benefit in reshaping the snorkel pipe. The turbo inlet pipe is a much greater restriction.
The one tuner in question happens to be the software that is currently in my 2003 Aero (awaiting replacement with SQR software). I don't believe the problem lies in the software. I believe the problem is that the power levels are greater than the capacity of the stock hardware and during rapid load changes the ECU can not accurately calculate proper a/f ratio due to the inertia of the air in the intake system (loosely quoted from WIS). I have twice had knocking so severe I could hear it from the driver's seat (with the windows down) but each time was immediately after a power shift on a fairly warm day when I was running the pi$$ out of the car. My theory is that the IC had total heat soak, intake temps were too high, EGT's were way too high and after the shift there was more air being forced into the throttle body than was expected (possibly due to the high flow delivery pipe). Once the "rapid load change" was over, the car cut boost and probably retarded timing and did all of the safeguards in place but for that instant after the shift, it could not correct fast enough and was knocking like mad. I think this is a common problem otherwise WIS would not make mention of it. The MAP sensor is supposed to take over "for correction purposes" but have heard claims that this is simply not true despite what it says in WIS. I have never heard any knocking except for the instances I described but you can tell the car is exercising knock control by the fluctuations in the boost readings and seat of pants dyno. This is normal and with performance software, the typical knock safeguards are in place.
Scott, I don't want to risk my post being deleted so I am not going to link any performance websites but if you want to email me, I will reply with all of the tuners I know of.
Good Luck!
posted by 65.114.4...
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