running lean power fc

[paulr33silver]

Hi there people just joined the site so hello ! I

I have just bought a r33 1995 and it runs well no bad idle etc I'm pushing out 347bhp and some times the car will cut out on full lock if you brake hard but only a couple of times ! on the dyno its in the lean zone just under 13 and hits just over 13 in places ! my apexi power fc is detecting knock ! it hits 60 and the engine light flashes .

The tunner I took it to says it needs a full map ! but the guy I bought it of had it mapped in November and I rang them and they gave me the figures over the phone and the car was running as it should . so my question is could it be the afm ? it just had a fuel pressure test and all was good so I guess that rules the fuel pump out and fuel filter etc ?

I run high octane fuel any help would be great thanks

[89CAL]

Sounds like the tune needs work. Its much easier to trust someone face to face then over then phone.

The only way to confirm is to take it to a 3rd party and check AFR's there. If they match the tuner that is saying it is leans figures then you know thats the one to go with. If it was me, I would be getting it re-tuned. Lean tunes dont last long