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Originally Posted by CSG Mike

I would never rev a stock engine that high. That's asking for an engine failure very, very quickly.

With a full cut at 7850, the engine will still have enough revs to easily hit 8250 RPMs, at which point, you'd actually be spinning the Rotrex to past it's spec as well.

The reason we (CSG) recommend shifting at 7000, is because the TPS and PPS have approximately a 0.04s delay in response. This is enough time where if you have well developed shifting technique (lifting the throttle right as you clutch in), there is a 0.04s long moment where the engine is essentially being free revved at WOT.

Now, you say, wait, there's a rev limiter at 7400! Yes, there is! However, RPMs also have momentum, and if your engine's rate of RPM climb is not zero or close to at 7400, the momentum will still take the RPMs higher.

Our datalogs show that at WOT, a 400-450 rpm rise is frequent.

That's why we recommend shifting at 7000. There's so much more power with the JRSC that you WILL overrev your engine if you're not careful. With a higher redline, the results are catastrophic.

Statements like that make us question how much testing has been performed by other Jackson Racing distributors.

Mike, would you suggest lowering redline to 7100-7200ish then on a JRSC 86? Sounds like it might be a nice safety option especially if someone else drives the car and hits the rev limiter