[Z OH 6]

Anyone know what the max pulley size you can run with an E40-E50 blend of fuel on the stock fuel system? Currently I'm running a 9.45 lower with no ethanol. Is it possible to run E40-E50 with a 9.06 lower? I'm thinking if it's possible, the power should be close to the same but with less heat in the blower.

[CW3SF]

Originally Posted by Z OH 6

Anyone know what the max pulley size you can run with an E40-E50 blend of fuel on the stock fuel system? Currently I'm running a 9.45 lower with no ethanol. Is it possible to run E40-E50 with a 9.06 lower? I'm thinking if it's possible, the power should be close to the same but with less heat in the blower.

I believe your other mods affect this also, ie., headers, big gulp vs regular CAI, throttle body, etc. Adding a JMS booster should also add to the amount you can run.

I don’t know the direct answer that you are looking for but I believe you can run e60 at sea level with full bolt ons and no pulley with JMS booster. So I’d estimate e50ish with 1 step pulley down using the JMS.

I believe that e40 is the most at sea level with full bolt ons and no pulley without a JMS. So I’d estimate probably e30 (10 points less) with 1 step pulley down, full bolt ons and no JMS. You wouldn’t know for sure without checking the tune to verify because every car is a little different and of course, altitude will play in also.

Hopefully someone with your exact set up can confirm or correct me.

[Camaro1973]

Originally Posted by Z OH 6

Anyone know what the max pulley size you can run with an E40-E50 blend of fuel on the stock fuel system? Currently I'm running a 9.45 lower with no ethanol. Is it possible to run E40-E50 with a 9.06 lower? I'm thinking if it's possible, the power should be close to the same but with less heat in the blower.

E50 is possible with no pulley changes. If you look at teds flex fuel package its about 650rwhp or so with just flex fuel. Once you start adding boost I doubt you'll even be able to run 20-30%.

[Z OH 6]

About what I figured.

[KingLT1]

Based on what I have seen is you will need a LPE DI pump and JMS booster then you could run E40. IF you did FIC +30, LPE DI pump, JMS you could probably run E60 or higher @ .84 lambda.

my Brother's C7Z was limited to E40 when it was Bolt-on, ported blower w/ 2.3 upper, LPE DI pump and JMS booster. That is currently what I am limited to with the same fuel system making around 11psi peak when it's cold out.

Temp plays a big factor. 85-95 degree day I can run E60. 60-80 degrees...E50. 45-55 degrees E40. Mainly because I see almost 1psi gain in boost per temp threshold drop. Ime the ability to run higher E content in the summer helps make up some power loss. When it gets cooler out you don't need as much E anyway. The colder denser air makes more power and less prone to knock.

[Z OH 6]

Yea, it sounds like any E is out of the question with any pulley setup other than stock.

[Camaro1973]

Originally Posted by Z OH 6

Yea, it sounds like any E is out of the question with any pulley setup other than stock.

It’s pretty much like a give or take with E. Make the power on E, less boost or increase the boost and little to no E.

Honestly it’s amazing just how much even a 10% increase of E has on demand for the fuel system.

I dropped mine back down to 30-35% max. And I’ve got full 80psi and 3300 rail pressure at this content. I’ve probably still got a bit of room but now the injectors are the weakest link.

I’m good with this one.

My next build in the works I’m Pushing for 1100-1200 wheel.

[Z OH 6]

Originally Posted by Camaro1973

It’s pretty much like a give or take with E. Make the power on E, less boost or increase the boost and little to no E.

Honestly it’s amazing just how much even a 10% increase of E has on demand for the fuel system.

I dropped mine back down to 30-35% max. And I’ve got full 80psi and 3300 rail pressure at this content. I’ve probably still got a bit of room but now the injectors are the weakest link.

I’m good with this one.

My next build in the works I’m Pushing for 1100-1200 wheel.

Going to need to switch to 15" MT ET Street Rs for any driving with that kind of power or it will be unusable.

[DrBlockHed]

Originally Posted by Z OH 6

Anyone know what the max pulley size you can run with an E40-E50 blend of fuel on the stock fuel system? Currently I'm running a 9.45 lower with no ethanol. Is it possible to run E40-E50 with a 9.06 lower? I'm thinking if it's possible, the power should be close to the same but with less heat in the blower.

I’m running E40 with a 2.3 upper with no issues. Also have headers and RF intake.

[Z OH 6]

Originally Posted by DrBlockHed

I’m running E40 with a 2.3 upper with no issues. Also have headers and RF intake.

Thanks for the feedback, are you running a ported blower too? 2.3 is a really mild, 8% increase in blower speed. A ported blower may push you over the fuel limit though. My blower is ported.

[DrBlockHed]

Originally Posted by Z OH 6

Thanks for the feedback, are you running a ported blower too? 2.3 is a really mild, 8% increase in blower speed. A ported blower may push you over the fuel limit though. My blower is ported.

It’s not ported, I do agree with u, ur gonna be at the edge of the fuel limits. I had asked my tuner about the same thing… porting my blower and still using E. He didn’t think it would be possible.

[CW3SF]

Originally Posted by Z OH 6

Thanks for the feedback, are you running a ported blower too? 2.3 is a really mild, 8% increase in blower speed. A ported blower may push you over the fuel limit though. My blower is ported.

Originally Posted by DrBlockHed

It’s not ported, I do agree with u, ur gonna be at the edge of the fuel limits. I had asked my tuner about the same thing… porting my blower and still using E. He didn’t think it would be possible.

Interesting discussion. I wonder what power difference would be in small pulley, porting and little to no ethanol and stock pulley, porting and e30 or whatever the fuel system will allow. The latter would definitely generate less heat. Need to compare logs once I get ported.

[Evansa22]

Originally Posted by Z OH 6

Anyone know what the max pulley size you can run with an E40-E50 blend of fuel on the stock fuel system? Currently I'm running a 9.45 lower with no ethanol. Is it possible to run E40-E50 with a 9.06 lower? I'm thinking if it's possible, the power should be close to the same but with less heat in the blower.

I'm at 13.5 psi max boost with cold air and I'm running 25% safely, 30% is right at the limit so dialed it back a little. That's with ported blower and 8% pulley.

Can definitely feel a nice difference between standard e10 here and e25

[JANNETTYRACING]

Originally Posted by Z OH 6

Anyone know what the max pulley size you can run with an E40-E50 blend of fuel on the stock fuel system? Currently I'm running a 9.45 lower with no ethanol. Is it possible to run E40-E50 with a 9.06 lower? I'm thinking if it's possible, the power should be close to the same but with less heat in the blower.

There is no question going back to stock pulley ratio is the right move.

I have seen this since 2015 LT4 Came out, they are super knock limited on 93 octane Stock.

Spinning the blower faster only makes the problem worse.

The blower is pretty maxed out on stock ratio.

I do a lot of testing and not looking at peak numbers but looking everywhere else.

Part of the engine efficiency is being able to run a timing value the completes the burn in the closed chamber to do work on the piston and be able to do that for more than a 6 second dyno pull.

I am not saying this to be a wise guy there is a message here.

My car is faster with stock pulleys and cam (the JRE 125 Flex fuel road race package) then 90% of the cars we see with the book thrown at them with big dyno sheets.

Too much focus on dyno numbers and not enough attention to how long you can stay at WOT with out losing power or engine destruction..

The question comes down to, Do you want a Fast Car or a Dyno Queen?

Being able to burn higher quality fuel is a Win Win, you get both more power and Longer Engine Life under the most grueling situations.

Feel free to pick this apart and ask a lot of questions, I'm always happy to get in on the party.