GT Redline

[DivineStrike]

Lol who is saying it's unsafe to rev these things?

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[Grintch]

Vorslag's TT3 car rev'ed to 7500 with stock internals and valve train. I also reran the numbers based on those dyno results and got higher optimum values, suggesting my power roll off assumptions for your data were conservative.

I will post the file whan I get home.

See attached. Feel free to play around with the numbers.

Norm makes some good points. You can see that as the gear spacing gets tighter, the optimum RPM's you pull past the power peak go down. And making the power curve peakier (in particular the after peak roll off), also reduces the optimum shift point. This is why race cars often shift closer to the power peak than a street car (plus they tend to be pushing the mechanical limits more).

 

[modernbeat]

Vorshlag actually reved to 7,800rpm for over 4 years of competition with their 2011 5.0, and it didn't even have the Boss intake manifold...

Well, we had the cut-off that high. And for autocross use we occasionally got up to the 7000+ range to avoid shifting to third. But for track use we usually shift at 6500 because we made peak power at 6400. We didn't try to run much higher than that on track as it was slower than keeping the car in the power band.

We do have a 3.31 rear gear, and until recently ran a shorter tire like a 315/30-18 Hoosier (The 345 Hoosier is a little taller). But our strategy was to run on the torque in the powerband and avoid the higher revs which make so much more heat and cause oil and wear issues.

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