[IneedAZ]

just to be clear, it only happens on turns under hard throttle? No reports of bad batch of pumps?

[travislambert]

Originally Posted by LiqTenExp

With cam you can easily take stock fuel pump + JMS Fuel Max in to the low 800whp range (load dyno #s) on 93. I'm in the low/mid 700's w/o issue. I'm set ~ 17.4 V.
..

I'd bet the farm if you can't go much over 700 RWHP safely (on 93) There is a big difference when testing on a dyno/street vs testing on a road course. When gas is only in the left side tank the pump is going to fall behind once the bucket is drained.

Not all road courses are equal either. VIR has the perfect layout to test this problem scenario If you have 750 RWHP+ you will run lean at VIR with only a stock pump and JMS booster.

That's where these aftermarket companies are getting it wrong too. They test on a dyno and call it good without validating their system works with only fuel in the left tank.

[F419sr1]

Originally Posted by IneedAZ

just to be clear, it only happens on turns under hard throttle? No reports of bad batch of pumps?

Correct. Straight it’s fine. Right hand turns are the worst

[F419sr1]

Originally Posted by travislambert

I'd bet the farm if you can't go much over 700 RWHP safely (on 93) There is a big difference when testing on a dyno/street vs testing on a road course. When gas is only in the left side tank the pump is going to fall behind once the bucket is drained.

Not all road courses are equal either. VIR has the perfect layout to test this problem scenario If you have 750 RWHP+ you will run lean at VIR with only a stock pump and JMS booster.

That's where these aftermarket companies are getting it wrong too. They test on a dyno and call it good without validating their system works with only fuel in the left tank.

Fore doesn’t use a bucket. They say the pump will empty the bucket much faster than stock. I also ask about the fuel pad pick ups. They will interfere with the factory gauge

[IneedAZ]

Originally Posted by F419sr1

Correct. Straight it’s fine. Right hand turns are the worst

I agree it is bizzare. As much as the unit cost you shouldn't need to through that. You would think for a car that is made to be tracked that the engineers would take turns into consideration and not require 3/4 tank of gas whether it be the tank or the pump. Does it do it from start to finish or only as the pump gets hotter under more demand?

[SFV1LE]

Stock I think the car is fine, at stock power levels the bucket seems to provide the needed "surge tank" feature even on NASCAR banking at ~140... Unless they modified the Nurburgring record setting ZLE, I'm guessing at those sustained speeds and WOT, they were below 1/2 by the time they hit the finish and the Gs were off the charts

[F419sr1]

Originally Posted by IneedAZ

I agree it is bizzare. As much as the unit cost you shouldn't need to through that. You would think for a car that is made to be tracked that the engineers would take turns into consideration and not require 3/4 tank of gas whether it be the tank or the pump. Does it do it from start to finish or only as the pump gets hotter under more demand?

I was at 3/4 at the start of my second session. Two laps in it started. There was 40 minutes between sessions. Topped it off for the third and it’s fine as long as it’s filled. This was a short track and I only burn a 1/4 tank each round. Longer faster track I won’t make a single session before it starts again