We put the sensor on the return line. Works great.

 

Same here!

 

So who has the gm flex fuel part number?

And just out of curiosity. I've got a decent question. Let's say the closest e85 station is done 65 miles away. Can I run pump 91 and e85 in the same tank? And tin the sensor so that at anything less than 50% it'll rub low boost pressure at around 12lbs and anything above say 70% it'll go up yo 20lbs?

 

depends on ECU.

With the haltech sport you have all kinds of adjustments. Boost and timing compensations. When set up correctly you have options to run a lower boost at 50% ethanol and higher boost at 85% ethanol. Easy.

Something to think about is a 4 port boost solenoid with a very low pressure spring in the waste gate. Say a 6psi spring. Then you can have the boost curve at 10% ethanol at 6 psi boost for a really safe tune. Then at 85% ethanol you can run 40psi boost.

Then throw in a speed sensor.

 

GM Ethanol sensor part info:
https://www.rx7club.com/alternative-.../#post11448625

As far as the switching, it's going to depend on your ECU and the what integrated capabilities it has.

 

No return line on that car, its a closed loop feedback setup that varies pump speed.
When guys go big big power they change the entire system out and use a traditional return line set up

 

cool.

How's the fuel pressure response under boost?

 

ive never logged it, its basically stock right now

feels- well it feels stock!

 

I love e-85 I tune a car and made 586 at 24 psi of boost on a BorgWarner s372 with a very safe tune.

 

I cant wait to get tuned next week on e85. Iv been driving for a month on my break in tune for the new motor, really sucks.

 

Hey guys, ordered this stuff from Amazon. Not sure if I got the right stuff, benol premix.. hitting the dyno this week so I need to know if I can use this stuff add pre mix on e85 or if I need to get other stuff.

 

^^ you bought the right stuff.

 

You using this stuff as well?

 

yes 1.5oz per gallon.

 

Nice. I've heard mixed usage... 1oz per....1.5.oz per..

 

I use 3 oz per gallon

 

Lotsoboostlulz

 

Does it smoke?

 

That is the only oil I use for e85 1 ounce to a gallon. Been running 22psi on my drag car for 2 years. Anymore is not necessary in my opinion

Sammy

 

speaking of AFR, I always thought E85 made max power way lower than what most of you are talking about.



is this not right?

 

Was able to get some tuning in. First session with e85. Ended short due to bossy control problems but man...this stuff is magic

 

399whp at 29psi is that right?

 

Yezzir!

 

Dyno sheet looks like you didn't push any higher than 5k RPM ?!?!

Not familiar with your build, but are you planning on tuning out to 8k?

Very impressive results!

 

"Dyno sheet looks like you didn't push any higher than 5k RPM ?!?!"

he had a boost control problem and it spiked to 29 so they aborted the run...

Howard