7afe loss of power Options

[Toynado]

hi all, i got a qiuck question, i got a stock 7afe with 4 into 1 headers and a performance filter and 17inch wheels, on sat we had a dyno day and my car made 76 kw at the wheels and 147 nm torque, it makes max torque at about 4000rpm and at max kw just after 4500rpm. there after it doesnt do much in the way of speed, i struggle to reach 195km/h my my friend with a stock 4age motor passes me like i'm standing still, the motor is newly rebuilt, question is why am i being creamed. the car pulls strong up untlill 3rd gear but when i put it in 4th i'ts all show and no go. is the dyno figures about right or not the workshop manual says it does 86kw dont know where the measure it though.

[Bitter]

well running higher octane without anything that needs higher octane does nothing. advance the timing to 15 degrees before top dead center and then go back to the dyno and see how it helps, if any. 2.25 inches (57mm) is a little large for a 7afe, 2 inches (50mm) might be a little more appropriate.

also, you might want to look at getting a wideband O2 sensor with guage and then some kind of tuning device like a safc2 so that you can tune the full throttle air/fuel ratio. you can pickup 3-5whp from that too.

as for the intake, if its all stock with just a filter, try something aftermarket or modify the stock airbox into a short ram. remove the tubing leading into the airbox but leave everything else alone.

This post has been edited by Bitter: Jan 31, 2007 - 4:30 PM