Oh boy! another overrev subject!
09-10-2005, 06:40 PM
#11
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Just do a search for over-rev. You'll see alot of subjects come up about this -- basically a lot of people don't show symptoms of a damage from an over-rev until maybe a few months later when they're engines start to lose power.
09-10-2005, 06:48 PM
#12
I've heard that the AP1 engine's valves will actually make contact with the pistons at about 10,200rpm. That does give you some leeway in a mechanical overrev.
Someone will correct me if I'm wrong, but I think that having this checked is no harder than a valve adjustment, which should run you about $150.
JonasM
Someone will correct me if I'm wrong, but I think that having this checked is no harder than a valve adjustment, which should run you about $150.
JonasM
09-10-2005, 07:07 PM
#13
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Sorry to hear that dude. I used to live in Norcross off Steve Reynolds Road. Anyway, I over reved my 2005 2 weeks ago missing the same shift you did. My rear tires locked and all. Read my thread in the under the hood forum labeled "Mechanical Over rev". It has some useful info. You really should have your engine checked out as soon as possible because you could have damaged some of the retainers on your valves. This is easy to check you just need to pull your valve cover and inspect the cams for score marks that you can feel if you run you finger nails over. Also, use a flashlight and look to see if your keepers are flush with your retainers. This will tell you if you cracked a retainer which could lead to a valve dropping into a cylinder thus destroying your motor.
Pulling the valve cover off and doing this inspection is relatively easy. I think that if your are competent enough to do an oil change and you have some basic mechanical skills you should be able to do this with assistance from the experts on this board.
Pulling the valve cover off and doing this inspection is relatively easy. I think that if your are competent enough to do an oil change and you have some basic mechanical skills you should be able to do this with assistance from the experts on this board.
09-10-2005, 10:24 PM
#14
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You definitely need to check the valvetrain out very closely. If the clutch fully engaged, then you DEFINITELY took the car over 10k RPM, since 8500 in 3rd would be moving along very nicely. With a speed/gear calc it would be easy to determine the max theoretical engine speed you attained, but it will definitely be high.
Since this is a mechanical overrev, the rev limiter can't save you. The car's inertia is literally pushing the engine to the RPM necessary to maintain the speed with the current gearing. It took 8500 RPM in 3rd gear to maintain the speed, so it might take, say, 11,000 in 2nd to maintain that. There isn't any real leeway in this unless the clutch slips or the tires lock.
Since this is a mechanical overrev, the rev limiter can't save you. The car's inertia is literally pushing the engine to the RPM necessary to maintain the speed with the current gearing. It took 8500 RPM in 3rd gear to maintain the speed, so it might take, say, 11,000 in 2nd to maintain that. There isn't any real leeway in this unless the clutch slips or the tires lock.
09-11-2005, 02:15 PM
#15
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Originally Posted by brent_strong,Sep 10 2005, 10:24 PM
It took 8500 RPM in 3rd gear to maintain the speed, so it might take, say, 11,000 in 2nd to maintain that.
If there was, what would I need to do to fix it? Would I need a valve adjustment, or would I need to replace whatever was damaged, such as a retainer? Hopefully I can make this a DIY project so to speak, as I'd like to keep my car out of a shop if possible. Let's all pray for my car and hope that everything works out ok
321, that's cool I know the Norcross area pretty well. My girlfriend's parents live there off of Spalding drive and she went to Norcross high school. Spalding drive is hella fun to drive at night, btw
09-11-2005, 03:40 PM
#16
As often as this happens it seems (myself included on 2nd day of ownership) I'm glad I got an external digital tach with programmable LED shift light that records the highest rpm achieved up to 13,000rpm. So, if I ever do miss a shift in the future I just hit one button on the digital tach and it tells me how high I went. I have an '05 and the highest it's recorded is 8230rpm (30rpm past the 'official' fuel cutoff). 
09-11-2005, 04:22 PM
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Originally Posted by afwfjustin,Sep 11 2005, 02:15 PM
Well I doubt that one shift would be worth 2,500 rpms. Each shift is between 500-1000. After rethinking everything I doubt that it even went past 10k
09-11-2005, 05:10 PM
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maybe someone could help me out too.....
i was playing on the highway, and went into 3rd at 92mph, and 2nd tops out at 89...
Im pretty sure im fine since its a 3mph diff, but then again im going FI soon so im gonna prob pull the valve cover off tomorrow and check it all out to be sure
i was playing on the highway, and went into 3rd at 92mph, and 2nd tops out at 89...
Im pretty sure im fine since its a 3mph diff, but then again im going FI soon so im gonna prob pull the valve cover off tomorrow and check it all out to be sure
09-11-2005, 05:17 PM
#19
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Originally Posted by jackhoff,Sep 11 2005, 05:10 PM
Im pretty sure im fine since its a 3mph diff, but then again im going FI soon so im gonna prob pull the valve cover off tomorrow and check it all out to be sure
Slasher I'm already in the process of asking local members to help me with what to look for. I'm not going to just 'let it slide'
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