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  1. 9

    2uzfe broken exhaust valves scenario

    One possibility is that the stock valves have 44.5 degree face angle and the valve seat is 45 degrees. A ring contact won't conduct heat effectively, which is very important for keeping the exhaust valves cool. Try a 45 degree grind on the valves.
  2. 9

    Unichip

    I'm running one in my '99 SC400 VVTi. I have it running and have a wideband lambda sensor installed, with A/F display. With all of my mods (ported heads, headers, full exhaust, modified intake manifold), I was surprised that the ECU is able to hold 14.7:1, during closed-loop operation, but it's...


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