Berto24

I have a problem my car is missfiring at around 4psi. Its just around the 4000rpm area then it opens and pulls hard to redline. I will attach the dyno graph. The previous owner told me it was because of the cams opening, also at that same point the afr gets a little lean but I assume that is caused by the missfire.


My setup is
B18b1 engine
Cp 9.0-1 pistons Eagle Rods Acl Bearings
Crower stage 3 cams
Supertech Spring and Retainers
K20 rsx coils
Ngk R5671A-8 plugs gapped to 0.17
Haltech sprint 500

turbohatch96y7

iTrader: (15)

If the afr is lean at the misfire it would be rich not lean... If it isnt firing it isnt burning fuel..
take it to a better tuner

2kdrift

Had a similar issue, basically bad tuner new tuner fixed the issue. First tuner didnt do a good job there was a lean spot in the map and needed more fuel

Berto24

I already add fuel in that load and it didnt do much. Already checked spark plugs, coils,that the timing didnt drift, fuel compensations.

TheShodan

iTrader: (14)

Why are you running such a cold plug? That's not even remotely necessary unless in a Circuit condition. Running too cold can actually cause more issues than it solves. Have you tried a 7 heat range yet? I'd look into that.

Berto24

havent tried them yet, will check them for sure