11:1 Compression What Fuel?
Thread Starter
Melting Slicks
Joined: Jul 2010
Posts: 2,762
Likes: 820
From: SUFFIELD CT USA 2023 C8 CORVETTE UN-MODIFIED FINALIST
2023 C8 of the Year Finalist - Unmodified
11:1 Compression What Fuel?
What fuel would you need for an 11:1 compression crate EFI motor?
Racer
Joined: Apr 2009
Posts: 488
Likes: 2
From: Myrtle Beach SC
I have the same CR...I run 93 with no issues. Just make sure you get a reasonably conservative tune.
For CT area tuners, I would recommend Mike Levesque, owner of J&M Motorsports. He's located on Broad Street in Manchester.
For CT area tuners, I would recommend Mike Levesque, owner of J&M Motorsports. He's located on Broad Street in Manchester.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
$$$$$EXPENSIVE FUEL$$$$$
I would say at a minimum in the summer, 93 Octane. In the winter, you could get away with mid premium.
To insure that you know the real answer, your are going to have to data log and see if you have any incurable KR under heavy loads and WOT.
If you run 92 Octane, Consider Meth Injection to keep the KR in-check. With the right tuning, you should be good to go. Who will be tuning the engine??
Bill
In Gales Ferry CT
I would say at a minimum in the summer, 93 Octane. In the winter, you could get away with mid premium.
To insure that you know the real answer, your are going to have to data log and see if you have any incurable KR under heavy loads and WOT.
If you run 92 Octane, Consider Meth Injection to keep the KR in-check. With the right tuning, you should be good to go. Who will be tuning the engine??
Bill
In Gales Ferry CT
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I actually used J&M Motorsports for my first tune on my 02 ZO6.
Stainless Works headers and a vararam. Made 385 RWHP 375 Tq
I now use Corvettes of Westchester Chuck does a fantastic job.
Stainless Works headers and a vararam. Made 385 RWHP 375 Tq
I now use Corvettes of Westchester Chuck does a fantastic job.
Last edited by Bill Curlee; Dec 31, 2012 at 09:56 PM.
Thread Starter
Melting Slicks
Joined: Jul 2010
Posts: 2,762
Likes: 820
From: SUFFIELD CT USA 2023 C8 CORVETTE UN-MODIFIED FINALIST
2023 C8 of the Year Finalist - Unmodified
The engine comes with a ECM tuned by the builder but I will keep your recommendations in mind for a double check!
Last edited by BPHORSEGUY; Dec 31, 2012 at 10:23 PM.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Keep in mind that your going to have a very modded C5 and LS engine. The tune that they provide is basically a mail order tune. With 11:1 compression,, it will be to your advantage to complete your engine and mod install and then have the engine tuned in the most severe driving conditions that you will subject the car to (ie 90 degree 90% humidity track day at Epping NH!)
The tune that they give you is a very good starting point!
Bill
The tune that they give you is a very good starting point!
Bill
Thread Starter
Melting Slicks
Joined: Jul 2010
Posts: 2,762
Likes: 820
From: SUFFIELD CT USA 2023 C8 CORVETTE UN-MODIFIED FINALIST
2023 C8 of the Year Finalist - Unmodified
Keep in mind that your going to have a very modded C5 and LS engine. The tune that they provide is basically a mail order tune. With 11:1 compression,, it will be to your advantage to complete your engine and mod install and then have the engine tuned in the most severe driving conditions that you will subject the car to (ie 90 degree 90% humidity track day at Epping NH!)
The tune that they give you is a very good starting point!
Bill
The tune that they give you is a very good starting point!
Bill
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
EXACTLY! Pick the tuner that you desire but,, get the car retuned ON THE STREET, so that it is tuned to real time conditions!
I have an excellent relation with Chuck at Corvettes of Westchester and he does an excellent job. If I think that theres an issue with the tune,, he rechecks it without question.
One of the best customer based Tuners that Ive found so far!
The main goal is to get a finial build tune!
Pick the tuner that you desire but,, get the car retuned ON THE STREET, so that it is tuned to real time conditions! I have an excellent relation with Chuck at Corvettes of Westchester and he does an excellent job. If I think that theres an issue with the tune,, he rechecks it without question.
One of the best customer based Tuners that Ive found so far!
The main goal is to get a finial build tune!
Le Mans Master
Joined: Sep 2003
Posts: 6,276
Likes: 227
From: Farmington CT
Cruise-In VII Veteran
step over to the ls1tech site for some background on the above tuners, you'll get a good idea in what area each one does well in.
Use the C5 F/I section and see how the results are for another comparison.
Are you asking what fuel the stock GM C5 Z06 uses? stock LS6 compression is 10.9:1
Pump gas, Premium
Melting Slicks
Joined: Jun 2012
Posts: 3,163
Likes: 6
From: Oceanside California
Here in Cali, 91 octane is the highest at the pump. Guys here build 11:1 engines all the time and do not have trouble. Maybe on the strip in the summer time it would be a good idea to add a booster, but other than that, the engine will do fine. If you live where the fuel is 92 or 93, you are in great shape.
Advanced
Joined: May 2012
Posts: 68
Likes: 0
From: Omaha Nebraska
I replied to your other thread about the swapped FRC. I have 11.7:1 and I'm running 91 octane. AFRs are at 13.3 with no knock, a bit lean, but my tuner is comfortable with what he saw through the tuning process.
Pro
Joined: Nov 2006
Posts: 627
Likes: 33
From: Omaha NE
I'm very surprised no one has commented on the difference between static and dynamic compression and which one really effects the fuel you can use. To the OP do a little research on them both and educate yourself first.
Racer
Joined: Apr 2009
Posts: 488
Likes: 2
From: Myrtle Beach SC
I ran a quick search and found this: http://www.empirenet.com/pkelley2/DynamicCR.html
I scanned through it...gonna have to go back and thoroughly read it. It has download links for a Visual Basic program to do the DCR calculations. I'm going to try it out later and see what I come up with.
Thanks for giving me something to do on a rainy day!!
Pro
Joined: Nov 2006
Posts: 627
Likes: 33
From: Omaha NE
That is a VERY good article. I'm not super knowledgable by any means but I was lucky enough to run across a good thread about this on LS1 tech. Just do a quick google search of dynamic compression pump gas ls1 and there is some decent reading.