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in my experience with ecu tuning,the better the throttle rsponse the more leaner the AFR,s were. My experience is only as a customer as my last two cars were tuned Evo,s. An 03 8 bought new,and an 06 Br350 IX bought new. I had the 8 dyno tuned by big Al (dynoflash) on Pruven Performances awd dyno at least 5 times.No problems,just re-tunes because of upgrades that i said i wasnt going to do.All the additional upgrades required the car be re-tuned.And my BR350 IX was also tuned on Buschur Racings awd dyno.So as far as tuning goes (ECU flashes and dyno tuning) i know what i,m talking about.The evo,s are maf cars,so its different than the BMW,s which dont have MAF sensor they are MAP as you know. (naturally).But talking with Al and other tuners like Dave Buschur and a few others,plus reading on the subject i have learned a lot.Everytime the cars throttle response wasnt feeling right before my re-tunes my AFR gauge would read a little rich.Which is safer to drive hard than being to lean.While waiting for my appointment to get tuned Al would tell me if its running lean keep it out of boost as much as possible and not to get on the car.But if i was rich then it was alright to still run it until i came in.Sorry for the long post,but getting to my point is that after the re-tune my throttle response was excellent and i was reading a leaner AFR. At idle it was 14.6 which is dead on.And at full throttle up to 7800 rpm,s it went from running 10.2 (rich) to 11.3-11.5,which is where it should be . So my point is the leaner the tune as long as its safe the better my throttle response and pulling power was,including mpg when driving normal.Maybe its different with the 335 because its not MAF controled,(metering the incoming air) but MAP controlled which i dont have any experience with because my Evo,s were tuned through the ECU (no stand alone)unit,but thats why i posted much better throttle response=leaner AFR,s.
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