What I need to get to run E85
#28
Elite Member
iTrader: (13)
Join Date: Dec 2006
Location: Taos, New mexico
Posts: 6,760
Total Cats: 631
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
Still sounds like it may be worth it to go e85 to squeeze the most out of my tiny turbo safely.
It also sounds like a good idea to keep a well tuned 91 octane map on hand for any trips with questionable e85 availability.
Thanks for the info, still need to do more research on this. I'm going to get the car running on the new motor/setup with 91 first and switch over. I'll probably need larger injectors anyways.
It also sounds like a good idea to keep a well tuned 91 octane map on hand for any trips with questionable e85 availability.
Thanks for the info, still need to do more research on this. I'm going to get the car running on the new motor/setup with 91 first and switch over. I'll probably need larger injectors anyways.
#29
Supporting Vendor
![](/mt2011/images_td/ranks/vendor.png)
iTrader: (3)
Join Date: Jul 2006
Location: San Diego
Posts: 3,303
Total Cats: 1,216
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
If you convert to E85 and then one day can't get any around you but need to drive the car so you have to run regular gas, do you need to sifon all the remaining E85 out of your tank or can you mix them? I would think you'd have to drain the tank fully...
Another benefit I see to E85 is for track-cars; I have zero detonation on the street, and there is headroom in my tune, but I've gotten pinging at the track when temps are high and running 91. My solution has been to throw a couple gallons of 100 in the tank to bring the octane avg a bit higher when I'm at the track, but 100 is $9/gallon at the track - so I would consider making the switch if I can get E85 near me... then just fill up some extra jugs and bring them to the track with me... might be more trouble than it's worth though...
-Ryan
Another benefit I see to E85 is for track-cars; I have zero detonation on the street, and there is headroom in my tune, but I've gotten pinging at the track when temps are high and running 91. My solution has been to throw a couple gallons of 100 in the tank to bring the octane avg a bit higher when I'm at the track, but 100 is $9/gallon at the track - so I would consider making the switch if I can get E85 near me... then just fill up some extra jugs and bring them to the track with me... might be more trouble than it's worth though...
-Ryan
#30
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
You can mix them but you'll need to retune based on what you end up with percentage-wise. Probably more time consuming than siphoning out the E85. When I switched between E85 and pump91 on my previous car, I tried to get the tank below 1gal before refilling and switching maps, and that 1:15 mix made no significant difference on how the car ran on the street. Though on a race car pushed to the limit, I would not chance it.
Thread
Thread Starter
Forum
Replies
Last Post
Greasyman
General Miata Chat
2
09-28-2015 10:44 AM