03-22-2011, 11:51 AM
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#10 (permalink)
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A True Z Fanatic
Join Date: Jul 2010
Location: window seat
Posts: 28,940
Drives: Mostly on two wheels
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Quote:
Originally Posted by BLM
My point was that there should have been some room for fluctuations. Adding a header should not lead to a blown motor. "So perfect"?? Seriously? If it's teetering on the edge of the leaner side of the optimal AFR, changing elevations would mess with it.
OOPS, just saw your sig. You're a stillen guy. My apologies. I saw one of those "so perfect" stillen tuned superchargers up against a GTM on a dyno. People who have installed both speak of the fitment with the stillen and how it makes you fit your car to the kit rather than the other way around.
Either way I feel terribly for the owner but why he would romp on it without a tune is beyond me.
Just goes to show he simply wanted to go fast and didnt have the knowledge. I'm not saying he had to build it himself, but to invest all that money and not understand that he shouldn't get on it until it was properly tuned doesn't add up. It's really his fault. If all he wanted was power then yea, lean it out with the current set-up. But he should have told the tuner to leave it a little on the richer side if he was planning on headers all along.
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You shouldn't change anything on the car without modifying the tune. I'm not a Stillen backer in anyway, and have generally been unhappy with how they handled the supercharger deal, but this is owner error. Changing headers certainly changes the tune enough that you should not be driving on it, and definitely not making a pull.
On my S2000, the IP exhaust I had on it separated, causing an exhaust leak. The leak altered my AF readings enough that the car would have done the same thing if I had run it. That's just how FI applications are.
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