tephra

iTrader: (6)

Hi Guys,

This weekend I will be installing my LC-1 and after that I will be tweaking my Hi Octane Fuel Map - what AFR's should I be aiming for?

I read that some people like 12.5 on spool, but others like low 11's

Any advice would be much appreciated.

Cheers
Dave

moreryce

iTrader: (25)

all depeds wut u use the car for...

tephra

iTrader: (6)

what do you mean?

cij911

iTrader: (14)

Generally folks recommend an AFR ~11.5 and a bit leaner (high 11's / low 12's) under 3000 rpm...That said, it really depends on several factors including gas, timing, and boost...

Mellon Racing

iTrader: (38)

I like 12's before boost and low 11's the rest of the pull.

Jeff_Jeske

iTrader: (66)

I aim for 12:1 at spool to peak torque then have it fatten up to 11:1 till about 6k where I richen it up just a little more till the next shift.

Whatever gear I tune in I normally end up with mid to high 11's till 5k because of lean spool. Even with the lean condition I still rarely ever get knock so I'm keeping it the way it is.

l2r99gst

iTrader: (2)

I do things a bit different than posted here. I like to have my AFR as rich as it's gonna get by peak torque and hold that AFR to redline. I don't like leaning it out at peak torque, which is the area that is most likely to knock.

For example, if I am aiming for 11.2:1, then I will get it 11.2:1 right before peak torque and hold it from there. Then, I use the timing to make adjustments. To each his own, though.


Eric

C6C6CH3vo

iTrader: (9)

Use what ever AFR that you think is best, whatever you do make sure you have a real-time knock_sum display visible after changes

tephra

iTrader: (6)

hrmm ok - so how does AFR affect torque?

11.5 seems pretty rich...

interesting stuff thou - thanks

Mellon Racing

iTrader: (38)

11.0 to 11.5 is ideal for pump gas, let your boost and timing make the power.

lemmonhead

ya I agree more adjustment in the timing is better. Gots to do both though to peak out your torque. Pretty lean on spoil up, I richen the hell out of it on top RPM and load though.

mrfred

iTrader: (50)

11.5:1 would be rich for an NA car, but for a turbo car, the extra gasoline helps control combustion chamber temperatures and provides a bit of detonation resistance. You wouldn't want to go leaner than 12:1 at high load/boost, and even that is pretty lean.

C6C6CH3vo

iTrader: (9)

that have resulted from timing advance.

tephra

iTrader: (6)

but isn't it wrong to richen when you have advanced the timing too far? wouldn't it be better to retard the timing a bit??

sekula

iTrader: (31)

i tune for high 11's for spool up but by redline i like to aim for low 11's since that will allow me to run more timing, which creates the power...and the richer you are, the more you can advance the timing....