Do I need E85?
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Joined: Sep 2010
Posts: 63
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From: Fargo ND
Do I need E85?
Up to this point I've gone the N/A route, but want to give nitrous a try. I recently picked up a dry plate setup using the HSW interface and am planning to work up to a 150 shot.
Relevant info on my combo is: forged rods/pistons, 11.7:1 comp, 0.035 quench, and a 237/248 111+2 LSA cam.
So my question is, given a good tune, can I keep running 91 octane (best I get in midwest), or do I need to switch to E85 (or add meth)?
Thanks for the input.
Relevant info on my combo is: forged rods/pistons, 11.7:1 comp, 0.035 quench, and a 237/248 111+2 LSA cam.
So my question is, given a good tune, can I keep running 91 octane (best I get in midwest), or do I need to switch to E85 (or add meth)?
Thanks for the input.
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Joined: Apr 2012
Posts: 2,673
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From: Forney TX
E85 tuned right is hard to beat, but you need to be aware that the mix may change from winter to summer by 15% and that will affect your tuneup. Most people who run it on their C5's seem to tune their own, or buy it out of a drum to better guarantee the blend is right. The blend changing won't cause any issues cruising around, but WOT can get you in trouble.
Drifting
Joined: Jan 2008
Posts: 1,927
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From: Edmond Oklahoma
I run Oklahoma 100% 91oct and 100% methanol injection in my c6z. 874/782 rear wheel at 12psi/6k rpms before belt slips. Nice to have that kinda power and Cruise where i want without worrying about my next fuel station. And gets good gas mileage.
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Joined: Sep 2010
Posts: 63
Likes: 4
From: Fargo ND
Thanks for the input braden and blownblue. So is the consensus that I definitely need more octane one way or the other when I spray?
I don't tune personally, so the variability of the e85 is definitely a concern. The couple people I know that run it in the area said they've seen 10% swings in ethanol content in the past year. How much variability have you guys found the computer can compensate for in closed loop mode? If it’s as simple as getting a tune dialed in for the mid level alcohol content and letting the computer sort out the +/- 5% swings, then I’m on board. But if I need to stay within a percent or two, it doesn’t seem very practical since I put over 10k miles on a year.
As for the meth option, I like the idea of not having to worry about ethanol content. Unfortunately it doesn’t seem to be a very popular way to go on nitrous for whatever reason (setup cost maybe?), so there isn't a ton of info to work off of. Looks like I need to spend a couple hours reading up on it.
I don't tune personally, so the variability of the e85 is definitely a concern. The couple people I know that run it in the area said they've seen 10% swings in ethanol content in the past year. How much variability have you guys found the computer can compensate for in closed loop mode? If it’s as simple as getting a tune dialed in for the mid level alcohol content and letting the computer sort out the +/- 5% swings, then I’m on board. But if I need to stay within a percent or two, it doesn’t seem very practical since I put over 10k miles on a year.
As for the meth option, I like the idea of not having to worry about ethanol content. Unfortunately it doesn’t seem to be a very popular way to go on nitrous for whatever reason (setup cost maybe?), so there isn't a ton of info to work off of. Looks like I need to spend a couple hours reading up on it.
Drifting
Joined: Sep 2008
Posts: 1,389
Likes: 3
From: somewhere shooting my assault rifles
Ive carried 10 gallons of E85 in truck of my Z06 many times just in case its no biggie doing that on a trip, but ive been stranded in the Tesla before....
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Thread Starter
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Joined: Sep 2010
Posts: 63
Likes: 4
From: Fargo ND
If I can get an E85 tune that's flexible enough to work with the fuel in my area, I wouldn't mind going that route. For road trips I can always plug in hptuners and switch back to a 91 tune and just stay off the juice.
That said, I'm still interested in learning more about mixing nitrous and meth since the fuel would be consistent and I wouldn't have to beef up my fuel system as much.
That said, I'm still interested in learning more about mixing nitrous and meth since the fuel would be consistent and I wouldn't have to beef up my fuel system as much.
