j/w

[Moai]

Originally Posted by gsxt5r1

im having trouble tuning my MAF-T any suggestions and also i knock at high rpm in 3rd and 4th gear but only about 15 to 20 counts

that's where you'll normally see knock.

if you're truly getting knock, take some boost away, add some fuel, or drop a degree or so of timing. See what happens.
Really, this should be done on a wideband O2. The Knock sensor is just a microphone and i remember some of the early DSM's would get knock readings off of loud lifter noise and other stuff. Its just a matter of the right frequency being picked up by the sensor and you might register knock when you don't have any. Widebands tell all.

[Shawn96VR-4]

Originally Posted by Moai

that's where you'll normally see knock.

if you're truly getting knock, take some boost away, add some fuel, or drop a degree or so of timing. See what happens.
Really, this should be done on a wideband O2. The Knock sensor is just a microphone and i remember some of the early DSM's would get knock readings off of loud lifter noise and other stuff. Its just a matter of the right frequency being picked up by the sensor and you might register knock when you don't have any. Widebands tell all.

WB02 tell all for AF. Too much timing and even a fat AF can still lead to knock.

VERY good point about the DSM. Older cars make noise. Period.

A lot of DSM guys don't even worry about knock sums in the 15 or less as they assume it's fake knock.

Also, ass dyno NEVER worked for me but maybe for others.

[ImprezaRS]

Originally Posted by Moai

in short, yes.

brew is correct. colder air = denser air. therefore there will be more air per unit volume as opposed to air at a warmer temperature. In turn, the air/fuel ratio will be higher. How much higher depends on the temperature.
For instance, you may experience knock on a car at 15psi on a 30 degree day, which you wouldn't see on a 70 degree day.

enough said