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Lambda vs Power

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lambda power
840 views 2 replies 3 participants last post by  HondaTom  
#1 ·
Considering I'm running forged pistons with the manufacturers piston to wall specification, I've been really cautious (maybe overly cautious) about my AFRs under WOT. I do my own street tuning, since I'm waiting on one more part before a pro tune, I have no way of actually measuring power with the exception of the raz dyno which isn't precise enough for small gains.

Anyways, I try to keep my AFRs around 13-13.2 at wot. As you all know the K's are extremely sensative to temperature, so the temp compenstation isn't 100% on point. Anyways, most of my pulls were done at around 76 degrees IAT and I used the approrpiate values for temp compenstation, via the temp calculator.

Last night the temps finally dipped into the high 40's low 50's, The car was running beautiful, strong, powerful, and actually kept on pulling in higher gears. I'm typically used to the car falling on its face @ 125+.

I have my lean cut enabled at 13.7, but due to not having a laptop last night, i don't know what the actual afrs were. On straight pavement, it was fine, But the slightest incline up hill when i punched it, around 7k i'd hit lean cut.


Was the cold temp to account for this power? or the Higher AFR values. And if so, How safe is it with forged pistons to run lets say 13.5-13.6

I'm not looking for speculation, theory, and most of the other responses that these forums seem to spit out. I'm looking for an educated and intelectual response from someone who actually konws what they are talking about.
 
#2 ·
My experience with the air temps you are talking about is, the cooler air is what gave you the power, not the higher afr. When I was n/a I tuned to 13.2 at wot, and I would fine tune at the strip between runs. My best times were in October when the air temps were in the high 40's, and they were better by over 1/2 a second compared to runs in the 70 degree range. Of cours, humidity and outside air pressure also have an affect on performance, but the K20 really likes cold air.

Once I have my car dialed in, I am going to try adjusting the afr using the temp compensation tables, instead of adjusting my fuel tables as the air temps drop.

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