Motor hit over 9k
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Motor hit over 9k
Well today I was cruising along at about 70 mph on the highway when I decided to switch gears to pass someone who had just cut infront of me. I forgot however that the cruise control was on and when I pushed in the clutch the motor shot up quickly to about 9k before I was able to cut it off. My question is, what are some potential problems to check for? I didnt have any problems the rest of the drive all gauges red normally. I didnt experience any power loss or feel anything odd. Thanks. BTW, it's an S4 motor with an S5 intake manifold.
#2
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I would say not to worry about it bro... I've missed a shift before and the s-afc read well over the tach shot some flames, and that was about it... If the car runs normally after this occurance i wouldn't worry about it.
evan
evan
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um...i thought the rev limiter on a s4 didnt let you go past 8250-ish? cause once i was holding the throttle down completely in N and it basically hit a wall at about 8250-ish? so thats really weird...but i have been driving for months now, without a single problem..
try not to think about it...it should be ok
Jahan
try not to think about it...it should be ok
Jahan
#4
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um...i thought the rev limiter on a s4 didnt let you go past 8250-ish? cause once i was holding the throttle down completely in N and it basically hit a wall at about 8250-ish? so thats really weird...but i have been driving for months now, without a single problem..
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#9
Originally Posted by carzy driver
what rev limiter? there is no limiter.
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Originally Posted by 90WhiteVrt
^LOL, ok that explains it then.
--Alex
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Originally Posted by raptor22
It doesn't matter if it has one or not; if you miss a shift the tranny will puch it past redline whether there is fuel going to the motor or otherwise.
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Originally Posted by raptor22
It doesn't matter if it has one or not; if you miss a shift the tranny will puch it past redline whether there is fuel going to the motor or otherwise.
I've had mine do this too, if the switch on the clutch is sticky the cruise won't shut off when you press the pedal.
#13
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Originally Posted by raptor22
It doesn't matter if it has one or not; if you miss a shift the tranny will puch it past redline whether there is fuel going to the motor or otherwise.
--Alex
--Alex
Also, I'm pretty sure the s4's have some sort of rev limiter. Mine hit a wall at about 7800.
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I missshifted in my s5 and was >9000 rpm (off the dial) while spinning around 4 times from rear end braking. My engine still seems relatively as strong as when that happened 2 years ago.
It will do less damage since it was unloaded too.
You should fix that clutch switch.
Stephen
It will do less damage since it was unloaded too.
You should fix that clutch switch.
Stephen
#16
Opinions are like........
Most tach's read incorrectly and optimistically as rpm climbs.
There is a rev limiter if running a stock ECU. Not sure if it is timing or fuel related but its there.
Also, depressing clutch should kill the cruise control. You should look into why that didn't happen.
There is a rev limiter if running a stock ECU. Not sure if it is timing or fuel related but its there.
Also, depressing clutch should kill the cruise control. You should look into why that didn't happen.
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i hate to be a source of misinformation....but from personal experience i know for a fact the engine hits a wall (fuel or timing..as stated above). I was having some problems with the car...and my rotary mechanic basically held the throttle cable down from under the hood, and it wouldn't rev past 8200-ish (maybe slightly lower?) on my S4.
Of course it's a different story and you mis-shift and the engine matches the revs to that of the wheels in the selected gear...that could be catastrophic (flywheel shattering?) if you select a very low gear at a very high speed.
BUT the original poster said the throttle cable was held down by cruise control due to the sticky clutch switch which didn't deactivate the cruise.
So, why didn't his car ever hit fuel (or) timing cut? maybe because he has a S5 ecu with a S4 block??
Either way...i doubt you caused too much damage. Don't stress it.
Of course it's a different story and you mis-shift and the engine matches the revs to that of the wheels in the selected gear...that could be catastrophic (flywheel shattering?) if you select a very low gear at a very high speed.
BUT the original poster said the throttle cable was held down by cruise control due to the sticky clutch switch which didn't deactivate the cruise.
So, why didn't his car ever hit fuel (or) timing cut? maybe because he has a S5 ecu with a S4 block??
Either way...i doubt you caused too much damage. Don't stress it.
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Crusing at 70mph with cruise on….. push in clutch and it rev’s to 9000.
So what rpm’s is 70 mph (3800?) and it took you that long to let the clutch back out?
So what rpm’s is 70 mph (3800?) and it took you that long to let the clutch back out?
#21
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You'd be surprised how fast an unloaded (clutch in) rotary will climb til it stops. I've done it before too. Besides that, if it won't disengage the cruise with the clutch in, it takes a second to figure out what happened, because the cruise pushes it up with your foot off the gas so to stop it you have to figure out that the cruise control did it, and turn off the cruise control, or get it in some gear at 7500 rpm +.
Oh, and your flywheel wouldn't shatter, because it's surface friction based, it doesn't lock in or anything, and it doesn't really care what gear you're in. Who hasn't, at one point or another dumped the clutch with the engine at 5 or 6 grand and left a nice long burnout? It'd actually be easier on the drivetrain at highway speed because the tires are already rolling.
Oh, and your flywheel wouldn't shatter, because it's surface friction based, it doesn't lock in or anything, and it doesn't really care what gear you're in. Who hasn't, at one point or another dumped the clutch with the engine at 5 or 6 grand and left a nice long burnout? It'd actually be easier on the drivetrain at highway speed because the tires are already rolling.
Last edited by Richter12x2; 07-19-06 at 10:37 PM.
#22
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Well... on the terms of 9k...
http://www.rerev.com/temp3/9kish.avi
Oh.... and a little straight downhill speed:
http://www.rerev.com/temp3/9kish.avi
Oh.... and a little straight downhill speed:
Last edited by Kenteth; 07-19-06 at 10:46 PM.