12-02-2015, 06:58 PM
You're assuming you're tuning to 14.7:1 - which at WOT you aren't unless you're planning to toast valves and pistons... Hence you need a wideband.
Lambda in the OEM application is simply for mixture trim whilst cruising for emissions - most of the time soon as you go WOT it'll totally ignore the lambda.
If you're steady state tuning on a dyno, you're absolutely fine to put a wideband up the poo pipe. You should have a reasonable idea of what's going on with the engine anyway in terms of the change in VE... So the stock narrowband is useless anyway, just do it properly IMHO if you're tuning it, otherwise it's not tuning it, it's guessing some figures.
Lambda in the OEM application is simply for mixture trim whilst cruising for emissions - most of the time soon as you go WOT it'll totally ignore the lambda.
If you're steady state tuning on a dyno, you're absolutely fine to put a wideband up the poo pipe. You should have a reasonable idea of what's going on with the engine anyway in terms of the change in VE... So the stock narrowband is useless anyway, just do it properly IMHO if you're tuning it, otherwise it's not tuning it, it's guessing some figures.
