Rev Limiter
11-07-2006, 03:51 PM
#1
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Rev Limiter
I just assumed it had one with that kind of red line but someone said they blew the engine by downshifting to the wrong gear. So I dont get that. 
11-07-2006, 03:57 PM
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The rev-limiter cant protect you from mis-shifting or down shifting into too low of a gear 
. It was designed to stop you from over-revs while accelerating. If you down shift too low and the engine pops up to say...10500 RPMS the rev limiter will kill the throttle but it wont be able to stop the engine from spinning up that high.
. It was designed to stop you from over-revs while accelerating. If you down shift too low and the engine pops up to say...10500 RPMS the rev limiter will kill the throttle but it wont be able to stop the engine from spinning up that high.
11-07-2006, 04:02 PM
#3
Yes, exactly. The rev-limiter will kick in to stop feeding gas into the engine when the revs are too high. Floor your car in a low gear, and you'll see what the rev-limiter does.
11-07-2006, 04:04 PM
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Yes, exactly. The rev-limiter will kick in to stop feeding gas into the engine when the revs are too high. Floor your car in a low gear, and you'll see what the rev-limiter does.
Unless you want to eat your steering wheel! It will be kind of like this ---> 
11-07-2006, 04:05 PM
#6
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Basically there are two kinds of overrevs. I don't know what the first one is called, but the second one is called a mechanical overrev.
The first one occurs during acceleration. If the computer would allow you, you could rev your car up until the point it broke. The computer in the car is monitoring the RPM that you're at, and once it reaches a certain point, it will no longer dump any more fuel into the engine, preventing the overrev.
The second kind is called a mechanical overrev. Basically the engine and the wheels do not rotate at the same ration. That's why you have a transmission in your car. So let's say you're going 90 mph in 3rd (AP1) and you want to shift to 4th gear, which would put you to about 7000 rpms in 4th, but you accidentally move the gear selector to 2nd. If your second gear were to go up to 90 mph, it would be turning over almost 12,000 rpms. Now the wheels WILL turn at 90 mph, and the moment you let your clutch out, the engine will match the rpms of the transmission, which at this point is around 12,000. The computer doesn't control the clutch, and it can't prevent you letting the clutch out when the engine would be over the rev limit, it can only cut the fuel, which won't help in this situation.
I wish I could be more clear on the issue, hopefully someone else who can communicate a bit better will chime in.
The first one occurs during acceleration. If the computer would allow you, you could rev your car up until the point it broke. The computer in the car is monitoring the RPM that you're at, and once it reaches a certain point, it will no longer dump any more fuel into the engine, preventing the overrev.
The second kind is called a mechanical overrev. Basically the engine and the wheels do not rotate at the same ration. That's why you have a transmission in your car. So let's say you're going 90 mph in 3rd (AP1) and you want to shift to 4th gear, which would put you to about 7000 rpms in 4th, but you accidentally move the gear selector to 2nd. If your second gear were to go up to 90 mph, it would be turning over almost 12,000 rpms. Now the wheels WILL turn at 90 mph, and the moment you let your clutch out, the engine will match the rpms of the transmission, which at this point is around 12,000. The computer doesn't control the clutch, and it can't prevent you letting the clutch out when the engine would be over the rev limit, it can only cut the fuel, which won't help in this situation.
I wish I could be more clear on the issue, hopefully someone else who can communicate a bit better will chime in.
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11-07-2006, 04:47 PM
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I think it is at 9100 or 9200 
. At 9000 it starts to flicker. If you just tap the gas after 9000 it kicks in on me. Maybe someone else can find the exact numbers on where it is at. You wont be able to go too far into the red zone before the ecu cuts you off.
. At 9000 it starts to flicker. If you just tap the gas after 9000 it kicks in on me. Maybe someone else can find the exact numbers on where it is at. You wont be able to go too far into the red zone before the ecu cuts you off.