Tuning question
Thread Starter
Racer
Joined: Apr 2008
Posts: 410
Likes: 46
From: Wausau WI
Tuning question
I have a quick ? for all you super smart people on this forum. Installing a FAST 102 this spring and need to go get a retune after. My question is this. What is the better gas to run for tuning purposes? And what would make more power? 91 oct full gas (no ethanol) or 93 oct E-10 (10% ethanol)? I am able to get both where I live. I know on the stock tune the 91 full gas is the way to go, but seemings its getting tuned, would the 93 E-10 be the better choice? Would that allow for more timing? During the last tune, my tuner said the car kept pulling timing, so was wondering what gas is better for my retune. Car is a 2007 ls2 6 speed. with vararam, lg 1 3/4 superpros, underdrive pulley and cat back w/ported 102. Also has MSD plug wires and tr6 plugs due to tuner recomendation. Thanks!
PS If i do end up using 93, what will happen if I run into a situation where I can only put 91 in it? Would that be bad or will the computer adjust for this?
Cory
PS If i do end up using 93, what will happen if I run into a situation where I can only put 91 in it? Would that be bad or will the computer adjust for this?
Cory
Supporting Vendor
Joined: Sep 2010
Posts: 470
Likes: 6
From: Southeast Florida Florida
Imperiacally, the 10% ethanol would raise the octane rating of 93 octane by about 2 to 95 or about 1% power increase. The 91 with 0% ethanol is ....91. It has litlle or no impact on auto-ignition temperature as well.
Based on your setup, I don't believe you will be tuning that close to the edge anyways so power impacts would be miniscule. Also the knock sensors will take care of any timing issues if needed.
Cost wise, I am not sure what the cost of straight 91 is to your E10 so I can't pick according to cost so I personally would go with the E10.
Ed M
Based on your setup, I don't believe you will be tuning that close to the edge anyways so power impacts would be miniscule. Also the knock sensors will take care of any timing issues if needed.
Cost wise, I am not sure what the cost of straight 91 is to your E10 so I can't pick according to cost so I personally would go with the E10.
Ed M
__________________
Vette Doctors Performance aka The Vette Doctors
52 Elm Place, Amityville, NY 11701 info@thevettedoctors.com or http://www.thevettedoctors.com/
(631) 841-0779
Featuring EFI Live/HP Tuners Performance Tuning in-house or remotely and HP Tuner/EFI Live training by ERM Performance Tuning
www.ermperformancetuning.com
Vette Doctors Performance aka The Vette Doctors
52 Elm Place, Amityville, NY 11701 info@thevettedoctors.com or http://www.thevettedoctors.com/
(631) 841-0779
Featuring EFI Live/HP Tuners Performance Tuning in-house or remotely and HP Tuner/EFI Live training by ERM Performance Tuning
www.ermperformancetuning.com
Instructor
Joined: Sep 2011
Posts: 104
Likes: 12
From: Corpus Christi TX
All the fuel refined down here is made for 10% ethanol blend. Meaning when a batch of 87 is cooked up, it's only around 84.5-85 octane without the ethanol. Premium is the same way..
Supporting Vendor
Joined: Sep 2010
Posts: 470
Likes: 6
From: Southeast Florida Florida
mispelled word (empirical)...meant scientifically but not necessarily reality....So the refinery saves twice, once producing lower octane base and the savings using 10% corn mixture 
Thanks for the input
Ed M
Thanks for the input
Ed M
Thread Starter
Racer
Joined: Apr 2008
Posts: 410
Likes: 46
From: Wausau WI
Imperiacally, the 10% ethanol would raise the octane rating of 93 octane by about 2 to 95 or about 1% power increase. The 91 with 0% ethanol is ....91. It has litlle or no impact on auto-ignition temperature as well.
Based on your setup, I don't believe you will be tuning that close to the edge anyways so power impacts would be miniscule. Also the knock sensors will take care of any timing issues if needed.
Cost wise, I am not sure what the cost of straight 91 is to your E10 so I can't pick according to cost so I personally would go with the E10.
Ed M
Based on your setup, I don't believe you will be tuning that close to the edge anyways so power impacts would be miniscule. Also the knock sensors will take care of any timing issues if needed.
Cost wise, I am not sure what the cost of straight 91 is to your E10 so I can't pick according to cost so I personally would go with the E10.
Ed M
