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.

[GTS13]

Ok, here's a few suggestions. Adding headers that just lead into a stock exhaust isn't going to do anything for you. Finish off the rest of the exhaust with a 2" header back with high flow cat and muffler. If you've already done this then disregard it. Next, nothing about a 7AFE needs that high of an octane unless you turbo it. Try running a more moderate octane whatever is in the middle for you. As for advancing your timing? lol, not really the best idea. You probably just spent some money on rebuilding your engine and this isn't going to help you maintain it's condition. Now I also agree that if you're going to do the full exhaust you'll want an aftermarket short ram intake and make your own heat shield for it. Taking a look at your wheels I can tell you that with a 7AFE, height matters. If you have a 45 height tire you're gonna lose a little momentum, try a 40 height if you don't already have it. (Hypocritically I learned that one the hard way).
Lastly, you have to understand the engines with the F series head are made for low end torque so once you reach those higher gears you're sort of out of luck, there isn't a whole lot you can do about it. I recommend reading this spot over at Toysport and making any decisions for the future of your vehicle afterwards.

http://toysport.com/webpages/Techinfo/Engi...FE20Engines.htm

Hope all this helps.

This post has been edited by GTS13: Jan 31, 2007 - 5:46 PM