Patrick G
08-02-2009, 10:33 PM
I just got done tuning another G8. This one is my own personal vehicle. You may recall a 2008 G8 from last year that had big gains on the dyno:
http://www.ls1tech.com/forums/dynamometer-results-comparisons/896664-g8-dyno-tune-yields-34-rwhp-29-rwtq-87-octane-only.html
That particular 2008 G8 made 279rwhp/299 rwtq with the bone stock baseline. The owner wanted to run 87 octane so I made him a killer regular unleaded tune and the results were 313 rwhp, 328 rwtq.
For my particular G8, it's a 2009. Comparing the factory calibrations, GM did a much better job on the 2009s than the 2008s and there wasn't as much power to be gained with just a tune.
My new 2009 G8 put down 307rwhp/333rwtq bone stock with 87 octane in the tank. With my slick 87 octane tune, we still picked up 18rwhp and 2 rwtq. The car can now cruise 75-80 mph in 4 cylinder mode. Fuel economy is up nicely. I like tuning these cars with 87 octane. We get them on the fringe of the knock sensors kicking in and lock it down. Then if we ever want to go racing, a splash of 93 octane keeps it happy. While I might have been able to get a few more ponies on 93 octane, the tune on 87 octane is really good and leave very little power on the table.
Just a small explanation about the low rpm torque difference: On my baseline dyno pull, we stabbed the throttle 100% later in the rpm range. While we did gain nicely at lower rpm, it was not quite that dramatic. For those who think you can only get strong performance on 93 octane, think again.
http://guerragroup.com/Guerra_G8_dyno1.JPG
http://www.ls1tech.com/forums/dynamometer-results-comparisons/896664-g8-dyno-tune-yields-34-rwhp-29-rwtq-87-octane-only.html
That particular 2008 G8 made 279rwhp/299 rwtq with the bone stock baseline. The owner wanted to run 87 octane so I made him a killer regular unleaded tune and the results were 313 rwhp, 328 rwtq.
For my particular G8, it's a 2009. Comparing the factory calibrations, GM did a much better job on the 2009s than the 2008s and there wasn't as much power to be gained with just a tune.
My new 2009 G8 put down 307rwhp/333rwtq bone stock with 87 octane in the tank. With my slick 87 octane tune, we still picked up 18rwhp and 2 rwtq. The car can now cruise 75-80 mph in 4 cylinder mode. Fuel economy is up nicely. I like tuning these cars with 87 octane. We get them on the fringe of the knock sensors kicking in and lock it down. Then if we ever want to go racing, a splash of 93 octane keeps it happy. While I might have been able to get a few more ponies on 93 octane, the tune on 87 octane is really good and leave very little power on the table.
Just a small explanation about the low rpm torque difference: On my baseline dyno pull, we stabbed the throttle 100% later in the rpm range. While we did gain nicely at lower rpm, it was not quite that dramatic. For those who think you can only get strong performance on 93 octane, think again.
http://guerragroup.com/Guerra_G8_dyno1.JPG