[Joshinator99]

Originally Posted by Rapid_blue_zl1_22

To the point I will be fouling plugs, or is it just not ideal for max HP? I want the car a little on the rich side since I road course track the car.

If you have cats, the AFR can dip while in COT (cat over temp) which is done to protect the cats. So you usually tune for the .82-.84 I mentioned with COT turned off, then turn it back on when you’re done tuning. So it’s important to know what you’re looking at in that regard.

I would consider .82 very safe on an LT4.

[Rapid_blue_zl1_22]

Originally Posted by Joshinator99

If you have cats, the AFR can dip while in COT (cat over temp) which is done to protect the cats. So you usually tune for the .82-.84 I mentioned with COT turned off, then turn it back on when you’re done tuning. So it’s important to know what you’re looking at in that regard.

I would consider .82 very safe on an LT4.

How do you know if your car is in the COT mode? My car is not tuned, and I would prefer to keep it that way if possible. My car does have cats.

[RobZL1]

Originally Posted by Rapid_blue_zl1_22

How do you know if your car is in the COT mode? My car is not tuned, and I would prefer to keep it that way if possible. My car does have cats.

If it is on the stock tune, then you're good to go if you don't want to tune it. You'd need to log it woth hptuners to get really good information on COT and other graphical data. At that point, tune it.

[Joshinator99]

Originally Posted by Rapid_blue_zl1_22

How do you know if your car is in the COT mode? My car is not tuned, and I would prefer to keep it that way if possible. My car does have cats.

If the car is not tuned (or modded I’m assuming) then why worry about wideband readings? Serious question.

Originally Posted by RobZL1

If it is on the stock tune, then you're good to go if you don't want to tune it. You'd need to log it woth hptuners to get really good information on COT and other graphical data. At that point, tune it.

[Rapid_blue_zl1_22]

Originally Posted by Joshinator99

If the car is not tuned (or modded I’m assuming) then why worry about wideband readings? Serious question.

I said earlier in a post that the car has a Kong X-ported blower on it. Kong and many other shops run the X-Port without a tune. I have had the ported blower on for 4 track days now and have not had any issues. The car runs great and pulls like a freight train up top compared to stock. I installed the gauge just to see where I'm at.

[Kerry]

Originally Posted by ShockingZ

What? stoich for gas is currently 14.08 for e10 and 9.8 for E85. Most E80ish setups will be around 10.0-10.2 stoich. Once you switch to lambda, you should see .84 of that but AFR would still be the 10.0 or less if you are on full E80-E85.

if lambda is reading .84 i dont care what fuel u put in it it will read 12.384 AFR or .84 lamda 14.7X.84 =12.384 period end of story.

Its not a guess its a fact. I have run pump gas, e85, methanol, been their done that but

My gauge reads 12.0 running pure methanol. Its not real 12.0 its realy a little rich for methanol. 5.0 or something.

Think about this. If it read the fuel and ur running say 15% methanol injection with pump gas what should the afr be.

should u tune 15% stoick for meth 5.0 and then blend that for pump gas 12.0 then do the math and figure out the afr. IT DOINT WORK THAT WAY.
What a nightmare if it did. No u still tune for 12.384 or .84



put ur gauge in methanol setting and see what it says.


running along in the mid gauge says 14.7 switch to lamda now it says 1, now put pure methanol in the tank. richen up till it says 1 lamda. Now switch it to afr. guess what it reads 14.7 even though u are running about 45% more fuel through it. Switch the gauge to the methanol setting now it reads 5.0 afr or what ever.

Its funny how misunderstood this is. IT READS THE AIR LEFT OVER NOT!!! THE FUEL.

[Kerry]

post from hp tuners maybe a better way to say it

I agree with mJolnir comment, Lambda does not care what fuel you're using. Off the shelf WB02 gasoline gauges are calibrated to output 14.7 when it is reading Lambda 1.0. So if you want to run 0.78 lambda, you need to target 11.47 AFR out of your gasoline scaled WB02 gauge. It does not care what fuel type you're running (Gas, E10, E85, Meth, Alcohol, or any combination mixture). It is measuring Oxygen levels, so it doesn't care what fuel you're burning. Tune your fueling off your WBO2 and knock, there are too many variables to get it right by calculations and theories, just start conservative and then start leaning it out. A dyno is also required to maximize power wit confidence (optimizing timing and AFR for your particular engine/setup and "what it likes").

[Joshinator99]

Originally Posted by Rapid_blue_zl1_22

I said earlier in a post that the car has a Kong X-ported blower on it. Kong and many other shops run the X-Port without a tune. I have had the ported blower on for 4 track days now and have not had any issues. The car runs great and pulls like a freight train up top compared to stock. I installed the gauge just to see where I'm at.

Ok gotcha.