Why do people use Z32's but not Q45's when upgrading? I would like to know, as im not sure myself. Here are a few things i know. I've heard that the Q45 is bigger than the Z32 but it cannot support as much HP than the Z32. The Q45 being bigger than the Z32 compromises low end response. Would the Q45 be pointless on an SR ? The Q45 is half the price of the Z32 and readily available, are they that terrible? Clearing up this would be really helpful
No, Q45's are fine and a good upgrade from an RB25 or SR MAF. However Z32's have a higher resolution than the q45. But very few people would ever benifit from it.
Z32 has the benefit on Skylines of being a straight swap too. Same size as the 20/25 AFM's. Just need to swap the wiring clips. Whereas the Q45 is 10mm bigger.
so for my redtop SR it would be fine, im using a power FC. Im assuming the map could do with tweeking aswell once its on? Whats the limit of the stock SR afm's?
well, what im getting at.. it wont compramise response just to be able to run big power... as im not really aiming for that. Im up at 282.6 atm, but once i get a boost controller i'll be heading for 1.1bar and hopefully closer to 300 would be nice. But i think the stock afm is pretty crappy anyway and worth doing anyway... If mapping doesnt need to be altered then ill just get one and try it..
Z32 will max out around 450bhp you can get a little more form it but the map gets a little clumsy when the flow meter is maxed. I have tuned RB 25's to over 500bhp on Q45 airflow meters I think they will do around 550/600bhp have never maxed one out, i normally use speed density systems for that sort of power. under 450bhp go for a z32 they are a little bit nicer to tune low down and fit to your induction and intake pipe much easier.
