stock afr
stock afr What should the stock afr be? I ask because both my car and my friends cobra show a wot afr around 14.x:1 with the stock tune and just intake/exhaust. I had mine tuned after headers to a "safe" 13.0:1. I figured my headers threw off the tune or it was changed with a hypertech by a previous owner. But my friend's cobra only has an intake and loudmouth and he knows the tune is stock. Both cars reading a 14 makes me wonder if they are supposed to be that way.
thanks
thanks
The stock "commanded" on the LS1 is like 11.6:1 , although you wont get that because the VE and MAF tables come too low stock, so you will actually run leaner than what is commanded.
I dont know what the Cobra commands on a stock PCM.
I dont know what the Cobra commands on a stock PCM.
What year cobra does your friend have.
Without taking COT into consideration a 2003-4 cobra commands a 12.0 (0.82031 lambda) from 3500 rpms and above.
A NA cobra might command a little leaner, but it is richer than a 12.8 airfuel.
Ryan
Without taking COT into consideration a 2003-4 cobra commands a 12.0 (0.82031 lambda) from 3500 rpms and above.
A NA cobra might command a little leaner, but it is richer than a 12.8 airfuel.
Ryan
Originally Posted by brad8266
The stock "commanded" on the LS1 is like 11.6:1 , although you wont get that because the VE and MAF tables come too low stock, so you will actually run leaner than what is commanded.
I dont know what the Cobra commands on a stock PCM.
I dont know what the Cobra commands on a stock PCM.
That is the value teh pcm is going to command, provided your airflow data is correct, (MAF, or VE depending on your tune) it will determine what kind of actual airfuel is delivered, but it should be very close.
If your seeing 14.x when the car is commaning 11.x then you need to tune the vehicle.
Ryan
If your seeing 14.x when the car is commaning 11.x then you need to tune the vehicle.
Ryan
Originally Posted by slow
What year cobra does your friend have.
Without taking COT into consideration a 2003-4 cobra commands a 12.0 (0.82031 lambda) from 3500 rpms and above.
A NA cobra might command a little leaner, but it is richer than a 12.8 airfuel.
Ryan
Without taking COT into consideration a 2003-4 cobra commands a 12.0 (0.82031 lambda) from 3500 rpms and above.
A NA cobra might command a little leaner, but it is richer than a 12.8 airfuel.
Ryan
Originally Posted by slow
That is the value teh pcm is going to command, provided your airflow data is correct, (MAF, or VE depending on your tune) it will determine what kind of actual airfuel is delivered, but it should be very close.
If your seeing 14.x when the car is commaning 11.x then you need to tune the vehicle.
Ryan
If your seeing 14.x when the car is commaning 11.x then you need to tune the vehicle.
Ryan
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Originally Posted by slowscott
Well I guess its good I got mine tuned haha. What would cause a cars tune to be so far off? Would an intake and loudmouth do that?
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Originally Posted by slowscott
So what will it actually read when hooked to a wideband? Or are you saying it will vary too much from car to car?
An N/A car in the 13's is fine. Check his plugs and make sure they're not ashy. I wouldn't worry too much about it but there's a possibility he's borderline to some detonation. 14.0 is iffy, but you shouldn't ever see near stoich under heavy load. Air fuel isn't a predetermined #. AFR should be whatever the individual car runs safely/strongest at IMO.
Originally Posted by slowscott
Well it turns out he was being retarted and reading me his ratio at idle 
Idk what was up with mine. Tuner was probably right about the hypercrap
Idk what was up with mine. Tuner was probably right about the hypercrap
I dont think a Hypertech can change your fueling tables, all it can really do is change timing. 