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C6 Corvette ZR1 & Z06General info about GM’s Corvette Supercar, LS9 Corvette Technical Info, Performance Upgrades, Suspension Setup for Street or Track
I got 13hp/13tq on FlexFuel. Gains will be more if you forget about Flex and go full E85 for a higher compression bump. That's where its at IMO. In the middle of switching to full E85 right now but there will be extra mods and a different dyno so I cant tell you what the difference between Flex and full E85 will be. Maybe 30-40 hp going from 91 to full time E85?
Thats the issue..i don't want to be stuck on full e85 since we are limited in being able to get it here and I still take trips in the car. So bumping the compression to really take full advantage of it is really not an option. Im not sure a 12-17 hp gain is worth the expense when we are talking hp/dollar.
I guess one advantage would be a cooler running motor in the summer and not as much drop off because of our southern summers?
I'm curious as well to the benefits of E85 on a HCI car. I'm also curious *sorry to hijack*, what people consider to be a safe SCR for full time E85? Assuming the occasional road race, 1/2 mile events, a safe SCR? (K501 cam, for DCR consideration)
What is safe? 13:1? 13.5:1?
None is available where I live, I have a 450 fuel pump installed, now I just need some ID850s and some corn.
The HP gains on E85 can be like 9% but it has to be done right with compression timing, AF ratio etc. I can not remember the exact number I read in this article but basically a gallon E85 has 30% less energy than a gallon of gas but you run it much richer (40% like 9 to 1 AF ratio or something like that). So 30% backwards but 40% forwards. So if you do not get the AF right you may not gain much at all.
Thats the issue..i don't want to be stuck on full e85 since we are limited in being able to get it here and I still take trips in the car. So bumping the compression to really take full advantage of it is really not an option. Im not sure a 12-17 hp gain is worth the expense when we are talking hp/dollar.
I guess one advantage would be a cooler running motor in the summer and not as much drop off because of our southern summers?
That's the reason I'm going flex fuel I'm not 100% E85. I don't want to be stuck on the highway with no E85 pump. There's no fear because you can run straight E85 in a flex fuel scenario and get all the advantages because the computer will automatically adjust to what fuel is in your tank.
Other than andvantages: running cooler plus burns cleaner and it smells a lot better than 93 pump gas.
I haven't dyno'd by car yet but I'm expecting it to happen pretty soon and I'm running corn with a big cam on a 454 stroker at 12.5 to 1 and 95# injectors. I'm expecting good numbers 👍🏾
anything from e85 to 91. My build will get tuned for 91 as there is very little 93 out west. If I go flex fuel, it will be tuned for 91 and the flex fuel computer will adjust the tune based on the ethanol amount it will detect. It will not adjust if I put 93 in, but stay on the 91 tune. For performance events, whether I do the flex-fuel or not, I would add some 100 unleaded to the fuel, if available, to bring the tank octane up to reduce cutback due to sensing detonation.
Power depends on what gas you have now, compression, etc.
AZ 91 sucks, and e85 allows an easy 6-8 degrees more timing. I've seen solid 30-50rwhp gains here. If you are somewhere where you have decent 93/94 octane, may not see more than 15-20 unless you bump compression.
I wanna know the upper limits of dynamic compression with E85. Forget static….well kinda
Lol same here, I already pushed mine pretty hard doing 13.8:1 and boost for 8 months strong now so I'm going to say N/A can go much higher then just 13:1 lol.
I saw about 10 rwhp on the dyno, but picked up 2 mph at the drag strip.
One thing for me, I don't run cooler at all. My car gets up to temp MUCH faster than before. I cant say it runs hotter, but if soo its by only a few degrees...not sure why. I expected to run cooler too
02-11-2016, 07:11 PM
Flex Fuel NA Gains?
