"if it was a bad sensor it wouldnt let me do anything right?"
Those are my thoughts. I have seen an 80s jeep without all the sophisticated fault codes that the car computers have now. It showed no fault code. A loose sensor kept it from revving to 2000 RPM. I haven't messed with a G35 sensor so don't know much about it.
A sensor's signal to the computer varies in Amplitude & Frequency with RPM. Now these sensors have magnets in them & can collect shavings. A dirty sensor may not put out a signal with enough amplitude to crank a car. This doesn't seem like your problem, but you do have a starter that is breaking in a new ring gear on the new flywheel.
Some cars have a provision to adjust the Air Gap between the sensor & reluctor teeth. If the G has this, you need to set it to factory specs. I have seen "too close" cause your problem. This adjustment may be impossible to set with the transmission bolted to the bellhousing. On these models, Porsche says glue an 0.8 mm thick washer on an old sensor to set the bracket. I don't like this & made a tool to get the distance, if you need it let me know.
Is your flywheel stock? Hanging out at a race at Road Atlanta last month the head mechanic of a race shop told me of having your problem with their shop car, so they didn't bring it. They had installed a later model motor & had a special flywheel made for their application. He spent a day on the phone with Motec, & with an oscilloscope finally came up with a diagnosis of the signal voltage being to high at high RPMs. They had to get the customers' race cars ready & did not have time to find a solution. If they have now, they probably wouldn't tell me what it was. If you have an aftermarket flywheel, you might want to call the manufacturer.
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Wife has 2007 G35 Coupe 6MT, Liquid Platinum,XM,Premium Pkg, Aero
Some of our other interesting rides
924 turbo, worn out, now a project, 914,
'66 BB Chevelle RIP
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