Fuel Starvation?
 

This weekend I was running Streets of Willow, counter clockwise. I started the day with a full tank of fuel. The last session of the day my car started acting funny. Going up the hill through the Chicane to the bowl I could run through the gears to 7500 no problem. But coming down hill turning left in the last two corners before the main straight my engine would just kind of go flat and not rev above 6000 rpm on the straight. I was down to a half a tank of fuel at this point. Do you think this could be a fuel sloshing problem from the half full tank and left hand turns?

Depends where the pickup strainer is.

You can definitely starve on 1/2 tank, but shouldn't if the car is NA. It's a pretty big pop / immediate loss of power if you run the rails dry.

The 'won't rev past 6000 on the straight ' doesn't sound like a fuel starvation problem. In my experience a starvation occurs mid corner and goes away fairly soon; by corner exit depending on length of corner

Yea that sounds odd. I'll start to lose FP mid-corner and the power level / consumption sometimes won't let it recover and I'll end up starving at the end of a straight.

Supercharged on e-85

I was fuel starving my car N/A on E85 by 7/8th of a tank on a long, high-g left hander before going with a surge tank. It would starve right after corner exit and would last two or three seconds.

That sounds like what I was experiencing.

Do you have a data log with RPM, speed and throttle position?

No.

Are you running with stability or traction control on?

NO

I was able to do some test pulls today. rev to 7500, up to 120 mph with no trouble, engine pulled hard all the way and wide band O2 never leaned out. So I'm guessing it was just the half full tank and the track configuration that was causing my problems.

you def had fuel starvation at half tank with your setup for sure. welcome to the club. gonna have to keep full tank or get surge tank setup. couldn't run Atlanta motorsports park n/a with half a tank without starving