Do DSM's continue to make more power when run leaner than 11.5:1 or so?

[4gfun]

After doing my searching, I noticed that most folks run 11.1:1 fuel ratio on pump gas because of safety.

I was wondering if these cars will make more power yet by running them closer to 12.5:1-13.1 like most other cars or will power begin to drop off?

The question is not due to my intent to run any leaner than that on pump gas, but rather based on the fact that I will be tuning via EGT and was wondering if I would begin to lose power for running leaner than 11.5:1 (nevermind the dangers).

Thank you for your time.

 

[silvreclips]

If you can pull off a 12:1 AF with no knock then of course you will make more power. There are alot of factors that come into play when tuning. Intake temps, boost level, timing, AF ratio. Most people find that 11.5:1 is the safest for daily driving.

 

[turboglenn]

Of course, to a point "leaner is meaner" and to a point it will make more power in a lot of areas of teh RPM band. But running much leaner than 11.5:1 at WOT on pump gas can be dangerous. Under low boost ( 1-8 psi or so ) i run from 13:1 at the bottom of teh boost range to 12:1 at about 6-7 psi. Timing is also kept higher under lower boosts. For instance 24 degees on pump gas at 5 lbs.

Actually MOST motors require more fuel and like to be a little richer in their peak torque areas. For instance 4-5k rpm i tune to 10.5-11:1, then as it peaks into HP i lean it down to 11.5:1. I put a LOT of R&D into my tunes though. I litterally spend a week or 3 preparing for a tune for a particular car's setup and from logs taken and notes exchanged with other tuners across the country. Most times i will rough tune the car for daily driving and safe WOT operation, then i do the studying and what not in the time between my rough tune and when i can get on the dyno.

 

[silvreclips]

I know my car seems to run much better around 11.5. It seems like any leaner and it doesn't pull as hard.

 

[GVR4592]

Air fuel metering

 

[Defiant]

They run like raped apes once you get that aluminum lit.

Just not very far. Turbocharged engines use fuel as a combustion chamber coolant.

 

[4gfun]

They run like raped apes once you get that aluminum lit.

Just not very far. Turbocharged engines use fuel as a combustion chamber coolant.

looool