[2018ZL1]

Originally Posted by BlueinTN

Not a pro tuner by any means but the first thing I would be looking at is where my A/F is running at WOT. All the other stuff is secondary.

A/F from the wideband was around 12.0-12.5

[BlueinTN]

Well thats a good number I am assuming thats a conversion from lambda.



I would run it like street/drag that but nothing wrong with worrying about the fuel pressure drop.


Now something like mile runs etc long WOT I bet your right your running out of fuel.

[2018ZL1]

Originally Posted by BlueinTN

Well thats a good number I am assuming thats a conversion from lambda.



I would run it like street/drag that but nothing wrong with worrying about the fuel pressure drop.


Now something like mile runs etc long WOT I bet your right your running out of fuel.

I agree... with the pressure being so low you would have thought the AFR would have been on the lean side... I am sure glad it wasnt!! I am planning on trying E40 this weekend and see what the high side looks like.

[regnouy37]

Originally Posted by 2018ZL1

I agree... with the pressure being so low you would have thought the AFR would have been on the lean side... I am sure glad it wasnt!! I am planning on trying E40 this weekend and see what the high side looks like.

Any results with using E40?

[regnouy37]

Originally Posted by Can'tHave2MuchHP

I've seen an upgraded low side help with loss of pressure up top due to the low side being able to contribute more (or something).

Your options are a cam w/ overdriven lobe or meth as you said or a very costly fuel system upgrade w/ high side/injectors or one of the fancy belt driven pump setups from Katech.

Taken from Corvette Forum on C7 Z06 (LT4):

"E40 maximum or 700 rwhp maximum to keep it like stock (625rwhp for LT1)

you can run the fuel system with falling pressures at WOT and squeeze out a little more, overwork the injectors, low rail pressure, etc but to me it's not worth it.

that's why so many bigger power cars are running meth as fuel (for better or worse). meth injection was designed as an intake charge cooler, not for fueling.

you can command more rail pressure to work the pump harder, it helps a little bit, not much, imo. you can also start injection earlier in the cycle, but then you are spraying out an open exhaust valve and losing control of fueling and wideband accuracy (false rich). theoretically you should be able to spray as early as intake valve open but that's really not a lot more time anyways and just a potentially larger fuel loss to the exhaust valve."

From what you have seen, should I be good running E50 with 2" Longtubes, Big Gulp Air Intake, and Ported stock TB? Looking to try this combo until I'm ready to do some fuel upgrades.

[2018ZL1]

Originally Posted by regnouy37

Any results with using E40?

Ended up with E37 in it at the track and it ran good, no fueling issues!

[2018ZL1]

Originally Posted by regnouy37

From what you have seen, should I be good running E50 with 2" Longtubes, Big Gulp Air Intake, and Ported stock TB? Looking to try this combo until I'm ready to do some fuel upgrades.

With those mods folks are running E60... with a 15 % pulley they are going as high as E45. Check out Ted Jennetty's videos.

[regnouy37]

Originally Posted by 2018ZL1

Ended up with E37 in it at the track and it ran good, no fueling issues!

Glad to hear it’s running well now!