Thread: My thoughts on E85 GTP's

Youtube video I made for a subscriber that wanted to know how things are going with the newly converted GTP.


YouTube - ‪E85 Grand Prix GTP‬‏

nice vid, good info, congrats on the success

Cool video. Makes me want it more. Just need to find that site that was all the E85 stations.

You're really making me want to do E-85 now.
Only thing that I guess I'm concerned about is the metal tank thing. You said 97 and 98 both have them?

I'm pretty sure e85 wont eat metal. Its a myth.

Thanks guys! And yes the 97's and some 98's IIRC. I'm not sure if the metal eating is true or not, but I have only clogged one fuel filter and the newer one is still just fine after a couple thousand miles.

Nice vid man! I got a e85 station 5 blocks from me but i drive 60 miles a day to and from work. Not sure if i wanna chance getting stranded as there are no stations along the way. Also it's hard to find the 60-65# injectors used at a decent price. I've heard some people keep a extra pcm in the car with the standard 91-93 octane tune so that they can swap it out if they get somewhere without e-85 and run standard gas.

Originally Posted by rynoman03

Nice vid man! I got a e85 station 5 blocks from me but i drive 60 miles a day to and from work. Not sure if i wanna chance getting stranded as there are no stations along the way. Also it's hard to find the 60-65# injectors used at a decent price. I've heard some people keep a extra pcm in the car with the standard 91-93 octane tune so that they can swap it out if they get somewhere without e-85 and run standard gas.

I actually pulled a pcm from a yard to use for my e85 tune. I carry my premium gas tuned PCM in my spare tire compartment. I figure if there is an emergency, I can just go back to gas. It only makes sense for if I need to travel.

Just remember, you can mix a couple gallons of e85 with gasoline on a gas tune, but you don't want any gas in your tank for an e85 tune. My car ran like complete crap for the first 2-3 tanks of e85 until I purged the system of that gas.

Originally Posted by OrangeL67

Just remember, you can mix a couple gallons of e85 with gasoline on a gas tune, but you don't want any gas in your tank for an e85 tune. My car ran like complete crap for the first 2-3 tanks of e85 until I purged the system of that gas.

So what do you do, drop in some E-85, burn off the rest of the gas you have in the tank, then do the tune?

moved to not the n/a section.

about the gas eating metal thing, y dont someone take a piece of sheet metal and some e85 and put it together in some kind of container and let it sit for a while and see if any thing happens to the metal?

it shouldnt eat away the metal. ethanol isnt corrosive.

Think about this. Ethanol=alcohol. beer comes in a metal can. Boom.

Closest E85 Station is 68 miles away from me, guess I won't be converting any time soon

Good info, but make sure you got the ability to get fuel regularly. I'd hate to be stranded or constantly be swapping out PCMs just to drive the car.

Did you drop pulleys with e85? if so what size and was it your only mod that let you drop?

Originally Posted by SeanGTP

So what do you do, drop in some E-85, burn off the rest of the gas you have in the tank, then do the tune?

I actually had almost 1/4 tank of premium in the tank when I changed the pcm and filled it up on e85. The car misfired under boost and all sorts of crap. I didn't feel comfortable accelerating hard until about 3 full tanks. Best thing to do is run your tank as low as possible then fill all the way up on e85. And don't go WOT until after you are on E again and fill back up.

Originally Posted by nawarkk

Who did your tune? Ryan C.?

Ryan C did the 93 octane tune. I did a mail order E85 tune from Dyno Brian at Dyno tune Motorsports.

I wanna do more mods to the prix but idk I think E85 is my only other option without spending big time bucks on a cam or intercooler..

You don't even need an intercooler on E85, It actually kills more KR than a full size IC because it burns so cool and the octane is so high. I wouldn't convert for power gains without some headers and a good exhaust. Remember you have to push 30% more of this stuff through the engine...

Originally Posted by JoRoW99

Did you drop pulleys with e85? if so what size and was it your only mod that let you drop?

I didn't drop a pulley size. I had a Knock free cam/ Full size IC setup. I probably saw a small increase (similar to slightly higher compression is the comparison I can come up with) From the 30% more fuel volume flowing through the engine. The rest of my power came from the 3* of extra timing and extra cooling. My tune is very conservative because I wanted to be safe with the mail order and dial it in later on. Even still, I can feel a BIG increase in power.

The part that amazes me is, I can probably run 23-24* of timing and also drop to a 2.55 pulley without any KR. But I will probably pulley down for the track and only add 1-2 more degrees of timing. I don't want to pop my 15 year old head gaskets.

I feel pretty confident in saying you could daily drive a 3.0" pulley on a cai, headers, injectors, running E85 summer blend with an average tune...

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