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      02-22-2020, 08:53 AM   #24
rueyme
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Drives: red z4
Join Date: Oct 2018
Location: san francisco

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Just a latest update. Finally got the break in done on the engine and had the dyno and tune scheduled with frank smith of ttfs last night. Bad news the engine is starving for fuel at around 7000 rpm it is hitting 14+ afr which frank said is dangerously lean at full load and that high rpm. You can see on the graph how it was building up power then falls off like a cliff at around 7k rpm. Hes running the injectors at 92% and he said rather than run close to full load it's better to address fuel issues from the pump to injectors to eliminate any future problems and to correct the issue properly especially since so much was invested into doing this build correctly.

The good side is be mentioned the build is really good, and he gave hats off to the builder of the motor. Carbahn supposedly did really well in putting the motor, he never seen this configuration push this much power without a dialed in tune on the dyno. Perhaps the underdrive pulleys plus the lightened flywheel also is helping reduce some minor parasitic loss in hp.

While I have the fuel system being worked out I decided to do some more cosmetics and chassis improvement by way of weight reduction.
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