Also could you advise me on colder plugs please? I replaced mine with NGK R PFR7G 11s premium platinums only 5000 miles ago.

A part number would be great!

 

Why colder plugs?

Did the dyno guy monitor your knock readings?

 

Yes he did, i asked to to double check the knock and he said there was none. Just for some unknown reason the ECU was shortening the injectory duty thus leaning out the AFRs and losing power one the pull after the cold one. The first pull was always fine but the next was always lean and down on power.

He told me the engine should run rich on the second run as it is hotter. All i can think is that the ECU is thinking the air is hotter than it actually is and putting in less fuel as hot air is less dense?

Im planning on changing the radiator, cleaning the fuel injectors, changing the plugs, maybe the MAP and intake temp sensor and then going for some more dyno runs in 4th gear instead of 5th.

I welcome any advice!

 

Well if its not a misfire I'd look at anything which will pull fuel or timing, so the MAP and IAT sensor would be up there.

 

What spark plugs would you suggest MB?

Would NGK R PFR7G be ok?

 

I use NGK R5672A-8

Based on my experience I wouldnt use the platinum plugs on a race car or a car doing hard work.

 

NGK 7746 iridium a is what I use. Full season of racing and they are perfect