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If you’re shifting at redline you’ll inevitably produce over rev events.
Max horsepower and torque are well below redline. Unless you’re trying to win a race, why go to redline?
The reason to shift at redline (even though peak power occurs several hundred rpm lower) is that this is the way to have best performance. You need to take into account the rpm where you land after an upshift. When shifting at redline, the rpm in the next higher gear will be closer to peak power (maximizing the average power). If you shift at peak power, you will allow rpm to fall too far in the next gear for best performance.
So possibly banging off the rev limiter doesn't even produce a overrev 1 report? Besides O-days car when does the rev limiter or fuel cut kick in? Is it right at 8000 or is it more like 200rpm above redline like most cars I've owned? Seems odd it would kick in at 8000.
Seems odd if we get an over rev1 at 8000 when the older Porsches on that list are all 200-600rpm above redline. I'm going to have like a million overrev1's if it's at 8000 :/
17955377[/url]]No, max power on a stock car is pretty much where the limiter is. That's why it's so easy to hit in the 4.0 cars, they kinda "feel" like they would want to go further.
You will get stage 1 over revs from hitting the limiter, but pretty much all cars will have those including PDK equipped ones. Stage 1-2 nobody cares about, including Porsche for warranty etc so it doesn't really matter.
You may be correct. My understanding comes from the manual. ¯\_(ツ)_/¯
Totally agree with @JCviggen , I’m always short shifting as I pass 7000, but it just wants to get to 8000. Pulls all the way through the revs.
Hey @Reedy , we’re you on a slight incline going downhill? Had 1 of those coming out of turn 14 at Road America. Was trying to setup a pass. Dropped into 2nd, WOT, and holy crap; that tac flew past 7000. When I later looked at the throttle trace, could clearly see the ECU cut throttle around 7850. Looked like momentum carried it just a whisker under 8000 before I up shifted. Your probably ok.
Nope, I just downshifted in a flat braking zone from 5th to 2nd and and the revs went up to 8500 when I let the clutch out. No throttle applied at the time obviously. Classic Money Shift. Luckily I have the video and data from Porsche Track precision to check because I didn't know how bad the overrev was initially. The compression braking almost made me spin.
Does anyone here know what the overrev ranges are for the 4.0-liter GT and GTS engines? And how about the rpms where the fuel cutoff occurs? Maybe one of the tuners has access to the stock numbers and can share them here?
I've got a CGTS, so I know I get 200 fewer RPMs to play at the upper range, but the engine spins so quickly near redline that I'm not missing the 200rpms or extra 20hp that's delivered there.
Nope, I just downshifted in a flat braking zone from 5th to 2nd and and the revs went up to 8500 when I let the clutch out. No throttle applied at the time obviously. Classic Money Shift. Luckily I have the video and data from Porsche Track precision to check because I didn't know how bad the overrev was initially. The compression braking almost made me spin.
Was the intent to do a single shift from 5th to 2nd, just at a lower rpm? Or, do you typically go from 5th-4th-3rd-2nd?
Besides the effective torque applied at the wheels through gearing will also benefit. Keeping them high up is good.
Besides who doesn’t like the sound between 7-8K.
True. The max power for the GT4 is at 7,600 against an 8,000 redline Max torque is at 5,500. But pick your car. Max power and torque are not at redline. If you enjoy the sound, go for it.
I'm on the side of "just enjoy it". The engine doesn't mind. In fact I was so annoyed by the rev limit at 8000 that I had it moved up to 8300. Screw the over-rev counter. I want to enjoy the engine.
True. The max power for the GT4 is at 7,600 against an 8,000 redline Max torque is at 5,500. But pick your car. Max power and torque are not at redline. If you enjoy the sound, go for it.
I hope you're not saying the only reason to exceed the torque or power peak is just for the noise?
I hope you're not saying the only reason to exceed the torque or power peak is just for the noise?
I'm not. But I think some people enjoy the noise from that last few hundred RPMs. I don't see much point in pushing an engine to redline. But to each their own.
I'm not. But I think some people enjoy the noise from that last few hundred RPMs. I don't see much point in pushing an engine to redline. But to each their own.
The only point is that's the fastest way to go. But if you don't need max acceleration to a speed beyond peak hp in that gear, then I agree...
02-06-2022, 02:05 PM
