Ok i have replaced the n75 and now it runs good on apr chip but only boosting 15psi....
10-27-2006, 02:54 AM
#1
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Ok i have replaced the n75 and now it runs good on apr chip but only boosting 15psi....
<center><img src="http://f3.yahoofs.com/users/4321151azd6b52d32/5bbd/__sr_/5261scd.jpg?phgteQFBbwDbAPXD"></center><p>It was boosting like 20 before the n75 but running like ****. does it sound like i am ready to hit up the track?
10-27-2006, 03:52 AM
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Isn't the boost spike a result of the delayed correction of the actual
boost back to the requested boost level? I thought that was because the N75 has some lag. If the APR chip requests 15 psi, and that is what his car is producing, why wouldn't that be 'right'?
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10-27-2006, 05:24 AM
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I would be willing to bet that at 3000 RPM and WOT, the chip is requesting more than 15 psi...
plus boost spikes are just the nature of chipped S4's. You're right in N75 delay being part of the reason.
In any case, I've never seen a properly running chipped S4 not spike over 15 psi at "normal" elevations.
I would pressure test it and log.
In any case, I've never seen a properly running chipped S4 not spike over 15 psi at "normal" elevations.
I would pressure test it and log.
