Air/Fuel ratio?
Thread Starter
Instructor
Joined: Apr 2006
Posts: 216
Likes: 0
From: Annapolis, MD
Air/Fuel ratio?
I put my car on the dyno today at the Corvettes at Carlisle event. It pulled an SAE corrected 349.7 HP and 346.3 TQ.
My question relates to the Air/Fuel ratio.
My ratios were as follows:
14.5 @ 2600 rpm
14.0 @ 2800 rpm
13.2 @ 2900 rpm
12.5 @ 3100 rpm
12.1 @ 3700 rpm
12.0 @ 4000 rpm
11.9 @ 4200 rpm
11.5 @ 4900 rpm
11.3 @ 5200 rpm
11.4 @ 5500 rpm
11.5 @ 6000 rpm
and it stayed at 11.5 all the way to the 6500 rpm redline.
Do these numbers look ok? Should I get it tuned? Will tuning get me any more horsepower/torque?
My only engine related mods are the Vararam intake and Magnaflow 15884 cat-backs.
My question relates to the Air/Fuel ratio.
My ratios were as follows:
14.5 @ 2600 rpm
14.0 @ 2800 rpm
13.2 @ 2900 rpm
12.5 @ 3100 rpm
12.1 @ 3700 rpm
12.0 @ 4000 rpm
11.9 @ 4200 rpm
11.5 @ 4900 rpm
11.3 @ 5200 rpm
11.4 @ 5500 rpm
11.5 @ 6000 rpm
and it stayed at 11.5 all the way to the 6500 rpm redline.
Do these numbers look ok? Should I get it tuned? Will tuning get me any more horsepower/torque?
My only engine related mods are the Vararam intake and Magnaflow 15884 cat-backs.
Last edited by trumpet; Aug 26, 2006 at 10:30 PM.
Instructor
Joined: Apr 2006
Posts: 229
Likes: 1
From: Doha Qatar
I think that it will be better if you keep your A/F ratio around 12.8 at low RPMs and raises gradually to 13.0 at high RPMs
this should give you better low end tourque at low RPMs and more HP at high RPMs.
I am not a tuner but that what I was reading in HP-Tuners forum
this should give you better low end tourque at low RPMs and more HP at high RPMs.
I am not a tuner but that what I was reading in HP-Tuners forum
Tech Contributor
Joined: Mar 2003
Posts: 12,094
Likes: 197
From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
12.8 doesn give more TQ than being lean. He isnt in open loop at the 14:1 readings. 13.2 leveling to 13.0:1 is optimum. The above a/f ratios indicate that cat overtemp is on. 10-12rwhp is in the tune/w-fueling.
