im plaining on tunning my car its a jdm gsr with intake header exhaust and i was wondering what should i have my air/fuel ratio at?????

 

What fuel will you be using ?
Where will the o2 sensor be probing for a signal (in the header)?
The motor is stock ?

 

ya the o2 is in my dc sport headers and im using 93 octane and ya the motor is a stock jdm gsr all it has is headers intake and exhaust

 

Target around 13.0:1 :-)

 

Use what MTber says.

Although tune for a flat AF ratio under load then fiddle with AF ratio later increase and decrease and see if that does anything for horsepower, I think the gsr and H22 are about the same in regards to wanting a richer AF under wot.

The problem with giving tuning advice on a forum without seeing the engine are all engines are different. although once you grasp concepts you can see if the changes you are making are helpful or worthless.

read some books too it will open your eyes to tuning.

Hope that helps, good luck.