Thanks Rix. Guess I should have went into a little more detail on that one.

You have to change the "map" prior to running a new gas type. The map or tune needs to be specific to the gas you run. Change of map takes 30secs and will need to be changed at the pump prior to driving your car. Drive the car very easy for the first 10 minutes or so.

Flex fuel tune would be nice though.

 

No but i have an ignite dealer very close to me now ,which is why i was thinking about trying it out & i'm pretty sure there stuff is legit.

 

Its very unlikely you'd gain any more power out of E98 over what you have. Really, in most cases you'd max out at around E65-E70.

Dzenno@PTF

 

That's interesting. I have felt that the only benefit of going above E70 was if you were in the fuel pump business. Dropping Ethanol content will take your fuel system a little further if you're on the edge.

 

Could you test it? Would be nice to know what pump e98 rates during the well, "cold" months for you.


Have you ran this ethanol yet?


This past fall, I ran my car at Miller (UT,) refer to post #24. Knock value went up, car ran hot, and obviously, didn't perform as well. On the longest straight the day prior (Verified E90,) I could feel the car pull hard in 5th up to 160MPH. Cant explain it but, just great! Day after running this e70, resulted in a boring 150MPH.


I logged every lap and I can say, there is a difference in certain situations. I don't think I would see this dramatic change ever driving on the street.


Test it and drive it. Can you log before and after? Don't know your driving conditions but, I would like to hear your thoughts!

 

This is the stuff i was thinking of trying there's a dealer near by ,i'll probably give it a try just to see what happens.

 

Might as well just get VP C85 if you really want to boogie.

 

Rix,
Guess my knowledge is short comings with C85. If VP C85 is actually E-85 that is certified or tested, how would that weigh against a pump that tests out as pump E-90?


Twturbo,


Did you run it and possible run a test? Any input on the gains or losses with the Old Butt dyno?

 

There has been Injector Talk on the forum lately. This specifically relates to E85 injector CC size.


I made the choice to install 1000cc injectors assuming that I keep the car below 1000 Crank HP. I recently came across a calculator that helps with this approximation. It may be wrong as it doesn't relate to a real life Porsche situation but,


Maybe a 5bar regulator is all you need to still be within range of your setup?


Thoughts on this? I don't know what capacity the stock pumps flow rate are rated at..

 

I posted this response today in this thread, please take a read:


https://www.6speedonline.com/forums/...0-130-a-6.html


In your calculations, you NEVER want to calculate 100% duty cycle (again read my post for the explanation), but for safety at 80% and if you are pushing it 90%.


BELOW #'S based on E85


STOCK 3.8 BAR FPR:
90% INJECTOR DUTY= 750-760BHP
80% INJECTOR DUTY= 660BHP


UPGRADED 5.0BAR FBR:
90% INJECTOR DUTY= 850-860BHP
80% INJECTOR DUTY= 750-760BHP

 

Ignite is one of the original, probably most reputable, ethanol race fuel vendors. Then you've got FTW Racing Fuels (Purple & Clear), and Rockett Brand (http://www.rockettbrand.com, E85 112) is another alternative. VP has always been a household race fuel name, but they only entered the ethanol market after seeing how popular it's been.


BUT be careful, some of these fuels are leaded, which ironically is one of the things people like to avoid when considering ethanol vs. traditional race fuels (VP Import/C16).

 

VP claims 3% "more power" from C85 but I'm not exactly sure how they arrive at that conclusion. Tony Palo was running it at one point in his 2000whp+ GTR so that's a pretty good endorsement.

Pump E85 is mixed with 87 octane, whereas C85 is mixed with MS109 or similar VP fuel. They also claim it has some anti corrosives in it to offset the Ethanol but I have no idea if that's just marketing or if it is real.

I don't think there's really any huge advantage to C85 vs pump E85 if the Ethanol content tests out. When my car was running I ran some E70 through it and it didn't seem to really change anything other than the fuel trims I saw on the Cobb AP. Maybe I'd run C85 on the runway for 1/2 mile for a little peace of mind but I wouldn't run it daily.

 

Be careful of vp c85 as it has MBTE in it. If your injectors are t stainless it can cause the injector seal to swell and you lose 30% plus flow

 

Good information Bobby!


Not sure why I thought 100% was max in this case for duty cycle. Guess I was in octane and intercooler mode at that time with a brain fart.


So can I just swap out the stock 3.8FPR for a 5.0 FPR and expect 80% injector cycle to delivery 750BHP?

 

Great post Rix!


I know my local supplier for E85 mixes with 87oct. I test a consistent E90 all year.


I'm glad you have some input on E70. You obviously test your fuel. What were your driving conditions on this grade?

I drove my car at a "road race track" to find the car was sluggish with a higher knock value. Could a tune possible cause this?


One can say they tune for E70 but, they may tune for E72 to push results / sales.


BTW, I'm not bashing any vendors with this statement but, just trying to understand the E content value and how tuners accommodate the inconsistent values this fuel actually sees.


Is there a standard with anything anymore?