Fuel pump was shot, turbo Solinoid wiring, cam timing , few other bits but all sorted now running perfect
Was running into the exact same issue in my R33 GTR. Thought maybe a coil pack was going out so I upgraded to the R35 conversion kit which helped but still had the problem but was able to get slightly higher revs. Then changed the fuel filter which was a mess and that completely cleared up my symptoms. Reading your reply’s seems that you fixed the issue. But good to know for future reference
I am also having similar problem, Rb30/25 det, Freddy ffp, 110mm tb, stock r33/25 det injectors, t04e turbo. Seems to hit rich/retard at just under 1 bar boost. How much would the extra 500cc engine capacity effect the AFM topping out? Pink sticker genuine AFM.
