have a 90 vette and i have an aem wideband gauge now what should it be reading at say wot and at idle i dont need exact numbers but ball park will help...

 

The stock tune is trying to get 14.7 at idle and cruise

 

thanks how bout at wide open???

if not then how lean is TOO lean at wot??

taking my car to the track friday and im on a hundred shot of spray i wanted to watch the afr to be safe so if it starts to get too lean i can let off so what would too lean be


(not new to nitrous but never had a wb uego)

 

Wide open, the ECM will go into PE (Power Enrichment) mode, and it should actually richen a little bit, maybe down to 10:1 or so. As far as how lean is too lean, well I would try and keep it no leaner than 14.7:1. It's safer to be slightly rich than slightly lean.

 

thanks bro


so if im running in the 13:1 range down the track on a hundred shot that should be fine right???

 

I can't say for sure, I don't know a whole lot about nitrous. I would think so, but I have no hands on experience with the stuff. Are you running a dry shot? If that's the case, you're relying on the ECM to see the extra oxygen and add fuel to compensate. Can you adjust the shot size? Maybe start with the smallest amount, make a pass and watch your AFR, then slowly increase it to see how it goes.

 

its a wet kit ill just watch the afr very close hopefully all goes well

 

Generally a WOT NA run should be between 12.5:1 and 13.5:1 AFR.
With a power-adder like N2O you should generally run between 11.5:1 and 12.5:1 AFR.

Every combo will be slightly different. The more prep you do for thermal management in the combustion chamber the leaner you can get away with.
A lean AFR builds more heat in the chamber, and heat builds up over time.
Running leaner makes more power, but limits the time you can get away with WOT loading. The longer you're going to keep the engine loaded the richer you will need to be to prevent damage. Heat-soak is also an issue.
A cool engine may go 10 seconds at WOT with a 13.5:1 AFR.
A heat-soaked engine may not go 5 seconds at WOT without experiencing detonation.