[ULTRAZLS1]

Thanks for all the reply’s everyone

Guess I could mix just wish I didn’t have to

What about lt4 injectors, in tank ,lpe di pump and also an auxiliary pump ? The ones I see you can tap into the tank ? Would that get me there?

[Umbriel]

Originally Posted by G2K

To me the hassle is having to use 2 credit cards every time I fill up since my bank freaks out when I use the card back to back. Having to actually go to twice the transaction is a big PITA for me. Then comes the what if i want to run 5gals for mexico nights vs filling up for everyday driving. I find myself constantly having to check, calculate and see after If i got the mix right if not (which in my case is most of the time) ANOTHER stop to the gas station to bring E% content down.

Yeah I don't want to deal with that, I want to run E85 and let that be it. I'll do whatever I have to to run it on straight E85.

[TJay74]

Originally Posted by KingLT1

Based on testing with my car...To run full e85(E80 max at the pumps) with a stock cam and no meth you will need LT4 injectors, ZL1 in-tank, and the LPE DI pump. That will handle about 8-9psi...with your current mods, you should hit that power goal easy.


That being said I don't know why you are so opposed to mixing down to around E60. Then you "might" get away with the LT4 DI pump...aside from that you can get pretty much all the timing and cooling benefits as E80(At the power and boost levels being discussed). It's not hard to mix at all...when I go to the pump, I pump 7.5 gallons of E85 and 2.5 gallons of E20. That puts me around E68 every time. I don't need to mix but full pump E85(actually E78) gains me nothing over E68 so I figured why not take the load off the fuel system.


This is straight up from testing on my car and my brothers C7 Z...not from he said she said or my tuner said. I have his Vette on E50 right now with the stock fuel system running 10-11 psi. High side holding fine, low side is dropping a touch but nothing crazy. That is with no BAP and just FSCM tuning.

Here is a good chart for reference far as mixing E85 and it's octane equivalency.

Hey King, what is your low side and high side pressure readings at WOT?

I have the full LT4 system and the JMS and was wondering how my car stacks up against your car.

[TJay74]

Originally Posted by G2K

To me the hassle is having to use 2 credit cards every time I fill up since my bank freaks out when I use the card back to back. Having to actually go to twice the transaction is a big PITA for me. Then comes the what if i want to run 5gals for mexico nights vs filling up for everyday driving. I find myself constantly having to check, calculate and see after If i got the mix right if not (which in my case is most of the time) ANOTHER stop to the gas station to bring E% content down.

I hand mix mine just like King, it is super easy and if you get a OBD2 Bluetooth adapter and have the Ethanol sensor it is super easy to check and see where you are at.

Basically here is all I do. I know at a half tank I will need roughly 10 gallons to fill up to full. A 6th gen Camaro gas tank is 19.8g. I then take what my current Ethanol rating is (say E41) and multiply it by 10g = 410 points.

Now if I am trying to get to say E50 I start playing with the math. Say I put in 7 gallons of E85, that will give me another 595 points. Then I add the 410 + 595 and get 1005 points.

Then divide the 1005 points by 19.8g and you get E50.76.

So once I know where my math needs to be to get me to the Ethanol value I want, I put the E85 into the tank 1st for how ever many gallons I need to hit the desired value, then I top off with pure 91 octane 100% gas to help mix it up.

So far from my testing I am pretty spot on, I am usually with in 2-4 points of what the Ethanol sensor reports once the fuel has mixed. I used to have an excel spreadsheet I made to do the math, it made it super quick to figure out how much E85 to add to the system.

Now if I could just figure out why my high side isnt holding as well as it should, I am limited around E40 right now for some reason.

[KingLT1]

Originally Posted by ULTRAZLS1

Thanks for all the reply’s everyone

Guess I could mix just wish I didn’t have to

What about lt4 injectors, in tank ,lpe di pump and also an auxiliary pump ? The ones I see you can tap into the tank ? Would that get me there?

I can run E85 not mixing and the injectors or right on edge at 6.2- 6.4 ms. The low side doesn't even flinch and that is with the Zl1 tank and a JMS BAP.

Like I said earlier, you will be fine with my fueling setup without mixing on 8-9psi which will likely hit 650whp with your mods. I was 600 in 5th gear on 19 degrees timing. So 620 in 6th, but I have put some timing in it...currently up to 21 degrees and it's happy.

Originally Posted by TJay74

Hey King, what is your low side and high side pressure readings at WOT?

I have the full LT4 system and the JMS and was wondering how my car stacks up against your car.

On pump E85 without mixing which is actually E78 at my local stations, High side maintains 26-2800psi and 70psi low. Injector MS is around 6.2-6.4 with a AFR of 12.2-12.4. And the fueling hits it's target with no MAF error. You have to know all this data, because if I leaned it out to 12.6-12.8 like some tuners do then the Injector MS would drop down into the low 5's but that is not a safe AFR imo. Ted Jenetty will second this.

On E68-E70 High Side 2800psi, low side 70 psi, Injector MS is 5.5-5.7, AFR 12.2-12.4.

So I am fine without mixing as is @ 8-9psi, but I have been playing around with mixing for educational purposes if I decide to turn it up and need to mix down.

[oldman]

Originally Posted by ULTRAZLS1

Thanks for all the reply’s everyone

Guess I could mix just wish I didn’t have to

What about lt4 injectors, in tank ,lpe di pump and also an auxiliary pump ? The ones I see you can tap into the tank ? Would that get me there?

From my data logs. 7 PSI boost, cam, heads, headers, 32% lobe, LT4 injectors, LPE pump on E10 the largest pulse width is 4.8 ms but on the rich side. So E85 would slightly over the rec 6ms width. This is with lobe, but it is balanced off by a built engine showing less PSI of boost per whp. Don't know how much HP I think 650 to 700 WHP... others think 710+ WHP. Hence I decided to do the LPE injectors on my forged build.

Clearly, the LPE pump and LT4 injectors offer the easiest build. One advantage of E60, or two is you get better MPG and have about the same HP as E85... Since much of your gain over a ZL1 is due to breathing: ported sc, tb, intake, headers, lt1 cam as well as a higher CR... your not using as much fuel to make brute HP...

[oldman]

Originally Posted by F419sr1

High. High volume pump and injectors for my lt4 I was quoted $4500 parts only

You have to be more specific about what you mean by for each part.

My price are approximates based on my memory.. I'm old

[G2K]

Great reads everyone, very informative. King I dont recall you have a LPE highside or LT4?

[F419sr1]

Originally Posted by oldman

You have to be more specific about what you mean by for each part.

My price are approximates based on my memory.. I'm old

Said nothing about your prices. Said nothing about each part either. Simply said what I was quoted for the pump and injectors

[Umbriel]

Originally Posted by ULTRAZLS1

Thanks for all the reply’s everyone

Guess I could mix just wish I didn’t have to

What about lt4 injectors, in tank ,lpe di pump and also an auxiliary pump ? The ones I see you can tap into the tank ? Would that get me there?

DSX said I would have to run meth if I wanted to get to 700+ with their auxiliary pump, LT4 hpfp and LT4 injectors on E85. After I told him I have a cam with the 32% fuel lobe he said I could get to 750ish.

[KingLT1]

Originally Posted by G2K

Great reads everyone, very informative. King I dont recall you have a LPE highside or LT4?

LT4 injectors
LPE DI pump
ZL1 tank
JMS BAP

Very few have the LPE DI pump because of the cost but imo the LT4 DI pump plus a good meth kit is basically the same cost.

[KingLT1]

Originally Posted by Umbriel

DSX said I would have to run meth if I wanted to get to 700+ with their auxiliary pump, LT4 hpfp and LT4 injectors on E85. After I told him I have a cam with the 32% fuel lobe he said I could get to 750ish.

Drsagcity has been 760whp with the Zl1 in-tank and JMS on E78. He ran out of injector before low side.

[Umbriel]

Originally Posted by KingLT1

Drsagcity has been 760whp with the Zl1 in-tank and JMS on E78. He ran out of injector before low side.

Was that on the stock cam? Was it with the LT4 high side?

[ULTRAZLS1]

So we are looking at...
Lpe di pump...1600
Lt4 injectors ...500
JMS bap ...400
Zl1 in tank...200

About 2700 bucks?