Hi folks,
I have an ae111 20V 4age with kelford 270 duration cams with 8.9mm cam lift.
I've been chasing missing power for a while now but I'm finally stuck at this peculiar problem.
Over the course of the year I've had a custom 2.25" exhaust made and with a cut-out pipe to bypass the muffler. This cut-out made me realize my "free flow" Thrus muffler was more restrictive than I thought.
After mucking about with cam timing, getting proper valve clearance, modifying the tune...I'm finally at the point where I think I've done everything but power still drops off sharply at 7200 rpm. These cams should build power up to 8000 rpm. I have even opened up the bowls of the head and de-shrouded the valves which resulted in a noticeable improvement above 5800 rpm. There is plenty of fuel up to the high rpm, the wide-band show me around .87 AFR. Max timing is 34 degrees, but I've messed around with it plenty.
I am wondering if some how the ignition system is letting me down. For a stock appearance, I am using a wasted spark setup from a Daewoo/Opel 16V setup.
Any suggestions? I'm trying to figure out what I'm missing. The stock engine is supposed to make peak power at 7800 rpm...
The engine bay picture is how it looks when I want the car to look stock. For power, I remove the air box and inside are the velocity stacks. There is a TRD 4-2-1 header on the car too. Thanks.