[CW3SF]

Mods are Rotofab dry, Soler ported TB, flex fuel kit, JMS PowerMax fuel pump booster and AWE catback. Adding Kooks 1 7/8” coated headers with green cats and get re-tuned. The most E content I’ve ran so far (before headers) is E62. Can I go to E70 safely with my setup?

[20Bluezl1]

Originally Posted by CW3SF

Mods are Rotofab dry, Soler ported TB, flex fuel kit, JMS PowerMax fuel pump booster and AWE catback. Adding Kooks 1 7/8” coated headers with green cats and get re-tuned. The most E content I’ve ran so far (before headers) is E62. Can I go to E70 safely with my setup?

I would trust Ted if he says it safe do it, but I believe you can't.

[Gunkk]

Headers will flow better, meaning lower backpressure and more air in the cylinders for any given boost, so lambda will try to rise and thus demand more fuel. E60 will likely be max unless you do the cam & go for +injectors.

[2018ZL1]

The difference between E60 and E70 when it comes to HP is negligible!

[ZLE dude]

Above E60 my high side starts falling off. I just spoke with Ted yesterday and he assured me that I need to run E60 MAX, no more, and my data is agreeing with him.

[L78toLT1]

60%e is about all I can get away with and I've got a cam with 32% hpfp lobe

[CW3SF]

Thanks for the responses. I had read that e60 was max but then I saw a couple of others saying they had ran e70. I don’t plan to push the envelope, just trying to learn what works and what is safe.

[EDFHOBBIES]

I don't get this mod and having to worry about E content over just a pulley and 93 making the same power. Granted the summer time or tracking the car timing might be pulled but some cooling mods could fix that. And anyone who's tracked the car on E knows to brings a shit load of E vs 93 that will last all day. Now if you have a good fuel system I get it fill it and go. I filled up with E91 last week tested right in front of me.

I called a buddy to go out to do some roll racing and he said his motor was blown I said what ya do add full E? He said ya how did you know? I said I know what fuel mods you have! I might mention he was told by his tuner at MTI he could run full E after he came in to adjust his meth kit and later that day at the track the motor said Bye Bye!

[laynlo15]

Only your tuner will be able to tell you the percentage of E you can run once you do some logging and he can see your High and low pressure numbers plus your injector pulse width. This is crucial so no guessing allowed. Also in HP tuner you'll have an additional table with flex fuel and the tuner will add timing to the flex fuel table and it will adjust depending on the E content. If your on straight 93 and the flex fuel sensor reads that no additional timing will be added but as you add E then the sensor sees that and can add more timing under acceleration or WOT. It works great. You need HP Tuners to log and send them to the tuner so he can optimize your tune. Its the best mod I've done on my C7, couldn't do it on my Camaro since I didn't have a big fuel system so it was cheaper to run race fuel.

[CW3SF]

Thanks. I’m running the corn because I track the car and I want more power. I do not want to pulley down and create more heat. I am more than satisfied with my results and just had a curious question. What works for some may not work for others.

[7LitreC5]

Max ethanol content for you is going to be different than most of the others here because of your altitude. You make less power so you can run more E%. I would recommend that you get a gauge (Banks will do it) or buy HPT so that you can monitor the low side fuel pressure and ethanol content.

I am running a Magnuson 2300 with 80mm pulley, NW 103mm tb, and a Roto-Fab Big Gulp. At my altitude, I see 11.5 psi of boost. I am running E85 out of the pump from Kum and Go which actually 66% ethanol. My low side is dropping on a long pull. I will be fixing that with a JMS.

If I were near sea level there is no way that I could run E66 with my mods.

[KingLT1]

Originally Posted by EDFHOBBIES

I don't get this mod and having to worry about E content over just a pulley and 93 making the same power. Granted the summer time or tracking the car timing might be pulled but some cooling mods could fix that. And anyone who's tracked the car on E knows to brings a shit load of E vs 93 that will last all day. Now if you have a good fuel system I get it fill it and go. I filled up with E91 last week tested right in front of me.

I called a buddy to go out to do some roll racing and he said his motor was blown I said what ya do add full E? He said ya how did you know? I said I know what fuel mods you have! I might mention he was told by his tuner at MTI he could run full E after he came in to adjust his meth kit and later that day at the track the motor said Bye Bye!

I would rather run less boost, more octane, and more timing opposed to more boost, less octane, and less timing. Yea on the dyno more boost on 93 might make similar power on a cooled down pull, but out on the street or track, the other setup will perform better.

You don't really have to worry...the stuff is easy to mix and there are plenty of options out there that allow you to monitor E percentage. E91 is reducing fuel mileage with that much E content. If you dial the E content back into the 50-60% range fuel economy also improves and you are getting 95% of the benefits of E.

Full E is kind of a open ended term. Full E could be 75% or 90% depending on the filling station. The only way to get consistent E is to buy it by the drum. You can't go from pump to pump expecting to get the same E content. I have seen pumps around my area range from E78 to E90. Normally if you go to the same pump the E content will always be the same except when it changes blends for winter. Either way I always look at my Ethanol % after filling up to verify it's where I want it.

Personally I don't trust anybody...If I am modding a car that I have a lot of money invested into then I am going to learn how to read data logs and make sure everything looks good. Plenty of engines have failed on 93 due to "tuner" saying everything looks good on a dyno.

[ZLE dude]

Originally Posted by 7LitreC5

Max ethanol content for you is going to be different than most of the others here because of your altitude. You make less power so you can run more E%. I would recommend that you get a gauge (Banks will do it) or buy HPT so that you can monitor the low side fuel pressure and ethanol content.

I am running a Magnuson 2300 with 80mm pulley, NW 103mm tb, and a Roto-Fab Big Gulp. At my altitude, I see 11.5 psi of boost. I am running E85 out of the pump from Kum and Go which actually 66% ethanol. My low side is dropping on a long pull. I will be fixing that with a JMS.

If I were near sea level there is no way that I could run E66 with my mods.

So here's where i got confused. I also assumed it would be my low side but the JMS voltage booster is doing it's job well. My low side pressure never waivers from 73psi, but as soon as I get over E60, like E65 for instance, my high side pressure will nose dive from 2900psi down to around 1200-1500. Keep it under 60% and it will maintain 2900psi no problem. Luckily I've got a Banks Data Monster and watch/log everything 24/7 so it was easy for me to see that it didn't like it. I also hooked up my HPtuners and logged pulse width and it showed similar poor results above 60%. BUT, every car is different, these are only my results.

[KingLT1]

Originally Posted by ZLE dude

So here's where i got confused. I also assumed it would be my low side but the JMS voltage booster is doing it's job well. My low side pressure never waivers from 73psi, but as soon as I get over E60, like E65 for instance, my high side pressure will nose dive from 2900psi down to around 1200-1500. Keep it under 60% and it will maintain 2900psi no problem. Luckily I've got a Banks Data Monster and watch/log everything 24/7 so it was easy for me to see that it didn't like it. I also hooked up my HPtuners and logged pulse width and it showed similar poor results above 60%. BUT, every car is different, these are only my results.

Nothing confusing about that. A JMS booster will normally provide more fuel then the stock High side pump. I have seen it several times. Low side drops first...add JMS then HPFP is the next weak link. Add a 38% lobe cam or LPE HPFP, then the Injectors the last weak link.

The most E content I was able to run on a C7Z that had ported blower, 2.3 pulley, 95mm tb, headers, LPE hpfp, and JMS low side was E60.

Same C7Z did Heads/Cam 32% lobe, Maggie 2300, +30 injectors, and the low side would just squeak by on E60 with 14.5psi...high side was solid.

Now the C7Z has Maggie 2650 and Cordes low side. Boost is @ 16psi and we are getting ready to start data logging. I will be updating thread in the FI section once I get some data.