What's your E content

KILLA BEE · 10-04-2022, 11:15 PM

Curious what others are running with regular Rotofab, catless longtube headers, and presently at E29.. Will I be safe going up to E50 or jus keep it around saying E 35-40 for now atleast.

Camaro1973 · 10-05-2022, 12:07 AM

Let your tuner determine that. But with a low side like a JMS you can run 50-55%

arpad_m · 10-05-2022, 10:20 AM

I can run 60-65% with an LT4 low side (same as yours) plus a JMS voltage booster. This is an LT1 with forged internals, so not the same engine, but the fuel system is the same LT4 you have.

KingLT1 · 10-05-2022, 11:21 AM

Quote:

Originally Posted by arpad_m

I can run 60-65% with an LT4 low side (same as yours) plus a JMS voltage booster. This is an LT1 with forged internals, so not the same engine, but the fuel system is the same LT4 you have.

I believe you have a cam with a larger fuel lobe? That makes a significant difference. AFR also has to be considered.

Most stock internal LT4's with stock fuel system can run about E65-E70 @ .84 lambda. With headers, ported supercharger or pulley (whatever gets to 12-13psi), and 4" cai, E50 is about the limit @ .84. Some tuners lean them out to .85-.86 and that will allow more E. Some tuners run .81-.82 and that will limit the amount of E even further.

Either way all cars are different. need to log both high and low fuel pressures along with injector pulsewidth. Anything above 6.0ms is out of fuel and going to start losing power.

I run E60 @ .83 with XDI +30, LPE HPFP, and JMS low side with LT4 pump. Stock internal LT1 with about 10 psi of boost. Same fuel system on a ZL1 can run E60 @ 14psi. LT1 @ 10 psi makes similar power to a LT4 @ 13-14psi due to compression and cam difference.

arpad_m · 10-05-2022, 01:10 PM

Quote:

Originally Posted by KingLT1

I believe you have a cam with a larger fuel lobe? That makes a significant difference. AFR also has to be considered.

Most stock internal LT4's with stock fuel system can run about E65-E70 @ .84 lambda. With headers, ported supercharger or pulley (whatever gets to 12-13psi), and 4" cai, E50 is about the limit @ .84. Some tuners lean them out to .85-.86 and that will allow more E. Some tuners run .81-.82 and that will limit the amount of E even further.

Either way all cars are different. need to log both high and low fuel pressures along with injector pulsewidth. Anything above 6.0ms is out of fuel and going to start losing power.

I run E60 @ .83 with XDI +30, LPE HPFP, and JMS low side with LT4 pump. Stock internal LT1 with about 10 psi of boost. Same fuel system on a ZL1 can run E60 @ 14psi. LT1 @ 10 psi makes similar power to a LT4 @ 13-14psi due to compression and cam difference.

Yes, that's true, I have a cam with a +32% fuel lobe (sigh).

At E60 and .83 lambda, my boost is around 10-10.5 psi, injector pw is 5.5-5.6 ms, so there is some reserve, which I like, being nearly a thousand miles from Ted's shop in case I blow the whole thing up, and of course I can't fix it

USAFS197 · 10-05-2022, 01:23 PM

Yeah, I'd be real careful about your E content and ensure you have open dialog with your tuner on what they see through your datalogs. I'd say do what they think is best and even err on the side of caution and roll a little lower than that.

MP3BOOSTED · 10-05-2022, 01:40 PM

not running a JMS but i'm at %50 e, %50 93 and meth

KILLA BEE · 10-05-2022, 02:05 PM

Quote:

Originally Posted by USAFS197

Yeah, I'd be real careful about your E content and ensure you have open dialog with your tuner on what they see through your datalogs. I'd say do what they think is best and even err on the side of caution and roll a little lower than that.

Agreed, he actually did tell me to put it between 45-50 % then bring it back in 2weeks for a retune. So I'm gonna do 40% jus to be extra safe. From E 29 to E40 I'm thinking will be a small gain but not much.
I'm only having second thoughts because a zl1 bogged out at the track and was on E41.I no it was probably his tune but it made me think. #paranoid lol I really appreciate yaws input

KingLT1 · 10-05-2022, 04:43 PM

Quote:

Originally Posted by arpad_m

Yes, that's true, I have a cam with a +32% fuel lobe (sigh).

At E60 and .83 lambda, my boost is around 10-10.5 psi, injector pw is 5.5-5.6 ms, so there is some reserve, which I like, being nearly a thousand miles from Ted's shop in case I blow the whole thing up, and of course I can't fix it

Good call! That is a good spot to keep it, so you have some breathing room for cooler weather.

ZLRob · 10-05-2022, 04:51 PM

Quote:

Originally Posted by KILLA BEE

Curious what others are running with regular Rotofab, catless longtube headers, and presently at E29.. Will I be safe going up to E50 or jus keep it around saying E 35-40 for now atleast.

Quote:

Originally Posted by Camaro1973

Let your tuner determine that. But with a low side like a JMS you can run 50-55%

This right here. The amount of E content you can run varies from vehicle to vehicle and that unknown factor changes even more when you start introducing mods into the mix. Let your tuner determine how much you can run unless you know exactly what parameters to look at and how to make adjustments based on that. If you are asking you probably don't though. (which is okay!)

SOCAL.M6.ZLE · 10-05-2022, 05:33 PM

Quote:

Originally Posted by Camaro1973

Let your tuner determine that. But with a low side like a JMS you can run 50-55%

Same here... with a JMS I am approved for E50 when hot and E40 when cold. We tried E60 and that was too much.

MartinLe · 10-05-2022, 05:56 PM

e40 @ .83. Some smart people think .83 is more than just a tad rich. Thinking about .84 -.85 to see what she'll tolerate.

Camaro1973 · 10-05-2022, 06:29 PM

Quote:

Originally Posted by MartinLe

e40 @ .83. Some smart people think .83 is more than just a tad rich. Thinking about .84 -.85 to see what she'll tolerate.

You can run them leaner with ethanol. Ethanol has the ability to pull hot air out of the cylinder so you dont need as much fuel.

Anywhere from 82-85 i think is acceptable. In this range makes the most power.

laynlo15 · 10-05-2022, 06:47 PM

I'm running E65 to 70 and that's what comes out our pumps here in Mid Missouri so I don't have to do any mixing. Running 23 degrees including the flex fuel advance, Afr is right at 12.5 on 10.2 or so boost. I also have toohighpsi port injection and running a JMS booster for extra voltage. No issues with injector pulse or low side fueling on stock Lt1 High side and Lt1 injectors and stock in tank pump which appears to be Lt4 pump. Maybe.

10-04-2022, 11:15 PM	#1
KILLA BEE Black lightning Drives: 2021 ZL1 1LE A10 Join Date: Mar 2013 Location: Nottingham Md Posts: 1,997 View My Garage	What's your E content Curious what others are running with regular Rotofab, catless longtube headers, and presently at E29.. Will I be safe going up to E50 or jus keep it around saying E 35-40 for now atleast. __________________ [ 2021 Camaro ZLE 10 speed

10-05-2022, 12:07 AM	#2
Camaro1973 Drives: 2019 ZL1 Join Date: Mar 2019 Location: NJ Posts: 1,537	Let your tuner determine that. But with a low side like a JMS you can run 50-55% __________________ 928rwhp - 93 \| 1040rwhp/898rwrq - E65 SAE LME 377 LT4 Short Block \| Magnuson 2650 80mm upper w/13% lower (9.06) \| DSX Lid & Valve Covers \| CSP Custom Cam w/32% fuel lobe \| CID Heads \| NW 103mm TB \| Roto Fab Big Gulp \| CSP 2" Headers w/Green GESI Gen 2 Cats \| Borla 3" Full Cat Back w/ S-Type\| Mighty Mouse Wild Catch Can\| Custom Holley Low side Fuel system\| TooHigh PSI Port Injection w/Holley Controller \| Forced Inductions Interchiller w/2 gallon fender tank \| TK Performance built 10L90

10-05-2022, 10:20 AM	#3
arpad_m Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017 Location: East Tennessee Posts: 13,150 View My Garage	I can run 60-65% with an LT4 low side (same as yours) plus a JMS voltage booster. This is an LT1 with forged internals, so not the same engine, but the fuel system is the same LT4 you have. __________________ 2018 Camaro 2SS — G7E MX0 NPP F55 IO6 735 rwhp \| 665 rwtq Magnuson TVS 2300 80mm pulley \| Kooks 1 7/8" LT headers \| JRE smooth idle terminator cam \| LT4 FS & injectors \| TSP forged pistons & rods JMS PowerMAX \| DSX flex fuel kit \| Roto-Fab CAI \| Soler 95mm LT5 TB \| 1LE wheels \| 1LE brakes \| BMR rear cradle lockout \| JRE custom tune 1100 - 1/30/18 \| 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 \| 3800 - 2/26/18 4300 - 2/27/18 \| 4B00 - 3/01/18 4200 - 3/05/18 \| 4800 - 3/14/18 5000 - 3/16/18 \| 6000 - 3/19/18

10-05-2022, 01:23 PM	#6
USAFS197 Drives: 2018 Audi TT RS Join Date: Jan 2014 Location: Navarre, Florida Posts: 1,915	Yeah, I'd be real careful about your E content and ensure you have open dialog with your tuner on what they see through your datalogs. I'd say do what they think is best and even err on the side of caution and roll a little lower than that. __________________ 2018 Audi TT ▊RS 2.4X 0-60, 1.6X 60', 120+mph 1/8th, 4.XX 60-130, 150+mph traps on 255/35/18 R888R tires on the street (unprepped). 2019 Audi RS3 About as fast as the TT RS 2019 Camaro ZL1 1LE Sold 2018 Camaro SS 1LE Sold 2019 Corvette Z06 Sold 2021 Charger Hellcat Redeye Widebody Sold

10-05-2022, 01:40 PM	#7
MP3BOOSTED Drives: 2017 Camaro SS 1LE (F1A-94 FBO H/C) Join Date: Jun 2017 Location: San Antonio Texas Posts: 844	not running a JMS but i'm at %50 e, %50 93 and meth __________________ Performance Mods: F1A-94, DSX Flex Fuel Kit, MSD Spark Plug Wires, KOOK 2" off road headers, MBRP Race catback exhaust, Pray Performance Custom Boost Cam, Rocker Arm Trunion Upgrade Kit, 7.850" Hardened Chromemoly Length Pushrods and Johnson Racing 2110R Lifters, TSP CNC'd Heads, Ported MSD intake manifold, 103mm Katech Throttle body, Forged Pistons/Rods, RPM Meth kit, DSX Aux Fuel system, AEM Failsafe and banks gauge, LT4 HPFP, LT4 injectors, BMR motor mounts, Hurst Short Throw, Manley SS exhaust valves Videos of my car? Check here: https://www.youtube.com/channel/UCNi...Qy1OL4NVGlPogw

10-05-2022, 05:56 PM	#12
MartinLe Drives: 2017 Chevrolet Camaro ZL1 M6 Join Date: Jul 2020 Location: OR Posts: 479	e40 @ .83. Some smart people think .83 is more than just a tad rich. Thinking about .84 -.85 to see what she'll tolerate. __________________ JRE Terminator Rough Idle Cam Magnuson 2650 - 15% lower, 90mm upper FIC+30% DSX Flex fuel/Low side NW 103mm TB/Roto-Fab CAI Monster S Series Elite E2-X 2" TSP LT's BMR:BK063, BK060,TCA061, UTCA060, UTCA063 Weld Beadlocks/17" NT5R2

10-05-2022, 06:47 PM	#14
laynlo15 Drives: 2022 Lt1 A10 Join Date: Nov 2015 Location: clark, mo Posts: 8,882	I'm running E65 to 70 and that's what comes out our pumps here in Mid Missouri so I don't have to do any mixing. Running 23 degrees including the flex fuel advance, Afr is right at 12.5 on 10.2 or so boost. I also have toohighpsi port injection and running a JMS booster for extra voltage. No issues with injector pulse or low side fueling on stock Lt1 High side and Lt1 injectors and stock in tank pump which appears to be Lt4 pump. Maybe.

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