Well new slip on the right, I ran 11.11, picked up 2mph in the 1/8 & lost 2mph in the 1/4, when I hit high gear it just laid down, fuel problem ? trans ? will figure it out. Race weight 4050lbs drove 130 miles round trip. I am so mad at myself, I did not look at my AFR gauge when it happened. 4 hours one run

Nice gain ..
May also be lack of gear causing it to lay over

Tex

Why such a big difference in the 60 foot. It all starts there.

The 1.66 was off idle & bad track prep

Ohhhh. That makes sense. Nice pick up and once you get her figured out looks like another new best in your future. Hurry up before you lose that good air

Nice going ! Get that top end fixed and you have a 10 second car. For a reference here is one of my 10.76 passes. You did good. What size fuel line you running and what fuel pump ? Congrats on the new best also. Ron

Its a tanks inc EFI set up with a return running a carb ,255lph 3/8supply,3/8 return . 6 psi it is supposed to be good for 800 hp

Sounds like you should have that handled. Good luck with it. Ron

Thanks Ron !!

Awesome, Charlie! Hopefully I can get mine out and start chasing your times this summer. But it won't be nearly as well sorted out...

I forgot that thing was EFI.

I would think it would be even more important to insure the fuel pressure is constant with that set up.

What system are you running that operates at only 6psi(or did you mean 60psi)?

Edit: looking at the specs for the Walbro 255 pump, I’d say you’re at the point where it may just not be enough pump.
It’s rated for 630hp........ going by this:

Yes that is the pump I have, it is still Carbed, running a 6psi adjustable return regulator. it is an EFI set up tank, will go EFI as money allows

I wound def flow test the system and make sure you have the flow you think you do.

NEVER ASSUME( Ass U Me ) anything on race parts, NEVER

will do tomorrow

Good Morning, I just did a fuel pump volume test, please correct me if I am wrong, it took 41 seconds for 1 qt @ 6psi, my math says my fuel system is only putting out 21.95 GPH, if thats the case it would explain a lot.
Thanks Charlie

If you did the test right....... then just under 22gph is what I get for 1qt in 41 seconds.

I assume you tapped into the system from the line that feeds the carb, installed a valve on the end of the line, turn on the pump and close down the valve to achieve 6psi system pressure.
Then time the flow.

I would try it at 5, 4, 3 psi as well, just to see how low the system pressure would have to be to flow the fuel you need (50-55gph).

My experience has been that when flowing the entire system, while maintaining the required system pressure....... you need something like a 140gph pump....... for your power level(600-650hp).

I have seen many systems not pass this test when fuel pumps that are marginally suitable are used.

The question now is, is it the pump...... or a restriction in the line/system?

Did you see what the free flow was?

I know of one instance where the free low was more than adequate, but when tested at 6si, there was barely a dribble coming through(about 6mins to fill a gallon can).

Such a cool car, one of my favorites here.

Fuel flow doesn't sound like quite enough!

Thank you Zippy