I've just fitted a Z32 (non original JECS / Nissan) to my V4 MY98 WRX and retuned the fueling on my Apexi / LM1. The Apexi has had the airflow set to V30 in settings. The car runs well under load but there is an initial throttle stall on up changes or on hill starts where the engine nearly cuts out before kicking back in. Anyone come across this? Have I got the £50 duff Z32 MAF when I should have got an original or is this something that should be tuned around by a professional rather than me?
Thanks.

 

Speak to Simon (JGM) about it, ideally get a mapping session with him. He mapped my classic 2.5 running apexi and Z32 and was perfect mate. Obviously there are other mappers out there that could also sort you out but I have only used Simon so can recommend him.

 

Sounds like you need to alter the throttle enrichment. Just a guess from your description.

Assuming airflow is increasing with actual airflow etc.

Simon

 

Thanks