Hi all
I have a R34 GTT and have noticed a rather flat spot between 5500rpm and 6000rpm when flooring it in gear.
Its not missfiring I dont think, and it doesnt pop or stutter, it simply doesnt accelerate as hard in that rev range. You feel the power kinda just drop off, but then pick up again after 6000rpm.
I noticed that this has only happened since I put on the full turbo back exhaust (spit dump, cat etc). Even before I put on the pod, it was pretty much the same. Last dyno run, boost was at 10psi. boost increase to 10psi is only because of the exhaust increasing boost, I have not played with boost at all.
Is this rich and retard? which is causing the flat spot?
I currently have NGK copper plugs in there, gapped at 1.1mm, heat range 6.
SydneyKid recommends 0.8mm gap at the same range to fix the problem.
Anyone have any ideas?
Thanks