Tomei air fuel gague

[matixx]

Have tomei air fule ratio gague installed in my car and was wondering how far is too lean? does this depend on the level of tune? when i got the car the adjustable arrow was set just above 10 and in high revs the needle would get pretty close to this..

[Lunatic Dancer]

10 is quite rich, alot of ppl say that 12.5 is about 'perfect' for our turbo cars...higher than that would be getting bit too lean...

when mine was dynoed it was hitting 12.5 at 5k+ and when i get my pfc i'd try to get it tuned to 12 just to be safe..

also remember to have correct timing.....wrong timing with a/f of 10 would be prone to detonation....(im pretty sure)

[matixx]

Yes I found this out the hard way. tinkering japs had chipped the ecu (mines) and must have advanced the timing too much, cause she blew the ends off the spark plugs and compression is down to as low as sixty in some cylinders. oh well rebuild is nearly finished and aftermarket turbo gives me a good excuse to replace mines ecu with pwr fc. might have to keep the mixtures closer to the 12 mark hey...