Hi all,

Recently finished a 13b PP build for my first gen. Engine has RX8 rotors with full depth RX7 ceramic apex seals. Running stock ignition for now with fresh leads and BR8EIX plugs leading and trailing. Mixture delivered by a 51IDA carb with 42mm chokes, F2 emulsion tubes, 245 mains and 195 air corrector.

The problem I'm running into is that the engine wont rev above ~5k rpm, and at WOT at any rpm the engine sputters rapidly and accelerates very slowly. Took it out for a quick test drive with a lambda sensor hooked up, idles around 11:1 and at WOT it stays around 12.5 (not optimal, but shouldnt be causing the issues I'm having)

I'm quite stumped with this as I originally thought it may be a fuelling issue, does anyone have any ideas?

 

what fuel pump are you using?

what is your exhaust setup?

 

Fuel pump is a Holley Blue, -8AN lines feed and return with 3/8 ID hardline inside the tank. I did test the flow rate of the pump which was around 350litres/hour at the filter (a bit low so pump could probably do with a rebuild)

Exhaust is a 2 into 1 RacingBeat short header, 2.5 inch exhaust with a presilencer and straight through silencer at the end.

Again, I really don't think it's a fuel flow problem as lambda was alright, definitely leaning more towards an ignitor or coil going out