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Old 04-20-2014, 11:59 AM   #1
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over-revved 4th to 3rd. how bad

Was trying to catch up to my friends and while doing so. Instead of grabbing 5th grabved 3rd and overrevved. What should I do? I'm 300 miles from home on spring break

I hope my motor won't grenade on me at all, especially on my way home.
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Old 04-20-2014, 12:04 PM   #2
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How close to redline in 4th were you before making the shift to third? How long did it take to make the shift and how long did you stay in 3rd?

Are you sure that you exceeded redline when you went to third?

Best case: you may be totally fine.

If you can find someone with a durametric you can quickly see if you had a type 2 overrev. Check pcarshops to see if there is a shop nearby and maybe they can help you check it.
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Old 04-20-2014, 12:14 PM   #3
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I was at redline in 4th before goib into third, second I felt the overrev I clutched in and went to six. I'm 200 miles now from home and its sunday so I'm S.O L right now.
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01 Boxster S BlacK/Black 6 speed (Totaled: Engine, Trans, and ECU Salvaged)

2001 boxster S Grey/Grey 6 Speed ( not stock and don't know whats been done to it)
Speed doesn't kill, It's the sudden stop that does.
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Old 04-20-2014, 12:17 PM   #4
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I did the same thing at the racetrack a couple of months ago. I momentarily saw ~7500 on the tach as I let the clutch out. Got the clutch back in, rev's came back down, and made the correct shift.

Then I cussed at myself inside my helmet for the next three laps. Out loud.

Then I realized that there isn't much you can do about it. What's done is done. Obviously its not "good" for the engine and I am careful not to repeat, but as long as the engine keeps running fine then it seems that I dodged the bullet.

Only you can deicide if you want to drive it. I did and everything has been fine but your mileage may vary.
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Old 04-20-2014, 12:21 PM   #5
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Quote:
Originally Posted by thstone View Post
I did the same thing at the racetrack a couple of months ago. I momentarily saw ~7500 on the tach as I let the clutch out. Got the clutch back in, rev's came back down, and made the correct shift.

Then I cussed at myself inside my helmet for the next three laps. Out loud.

Then I realized that there isn't much you can do about it. What's done is done. Obviously its not "good" for the engine and I am careful not to repeat, but as long as the engine keeps running fine then it seems that I dodged the bullet.
Good advice. Anyone who tracks their car has likely done this. Happens...
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Old 04-20-2014, 12:25 PM   #6
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Got a point, this may bother me for a while, bit I'm still rolling down I-10 so I guessing I'm good for now.
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01 Boxster S BlacK/Black 6 speed (Totaled: Engine, Trans, and ECU Salvaged)

2001 boxster S Grey/Grey 6 Speed ( not stock and don't know whats been done to it)
Speed doesn't kill, It's the sudden stop that does.
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Old 04-20-2014, 12:38 PM   #7
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Haven't you had this problem before? Maybe it's time for a tip, I kid I kid. But hey I'm glad I have my tiptronic, it has protected me from a downshift or two haha.


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Old 04-20-2014, 12:46 PM   #8
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What you can do: drive it ! You can't un-over rev it, and as long as it didn't blow up, forget about it (but don't do it again ).

"But hey I'm glad I have my tiptronic" Well, there's one good thing about an automatic transmission.

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Old 04-20-2014, 12:48 PM   #9
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My last problem I fixed witg good advice, this was just a mistake and I saw 8000 rpms and I really freaked. But she didn't blow and I'm 2 hours from home.
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01 Boxster S BlacK/Black 6 speed (Totaled: Engine, Trans, and ECU Salvaged)

2001 boxster S Grey/Grey 6 Speed ( not stock and don't know whats been done to it)
Speed doesn't kill, It's the sudden stop that does.
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Old 04-20-2014, 01:35 PM   #10
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bent valves?
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Old 04-20-2014, 01:40 PM   #11
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Chalk it up to experience, learn from it, and move on.
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Old 04-20-2014, 02:17 PM   #12
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if you are feeling eager you can pull the oil filter and check for metal. could be done on the side of the road - you only loose a bit of oil. i did a second to first instead of third on the track once myself. wheels locked and i went sideways. live by the sword ...
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Old 04-20-2014, 03:50 PM   #13
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In the late 80's I was downshifting my fiat x1/9 from 4th to 3rd and accidentally got 1st. Locked up the rear wheels for a second before I got the clutch back in... Turned out to be fine thankfully but got my heart racing...
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Old 04-20-2014, 05:12 PM   #14
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Question

I thought these cars had a rev limiter to keep you from pushing it too far????
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Old 04-20-2014, 05:39 PM   #15
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When are downshifting it is the force from the wheels up through the drive train that forces the engine to overrev. This type of overrev is called a mechanical overrev. The rev limiter just cuts the fuel to the engine when you are pressing the gas and accelerating and that's how it keeps you from overrevving.
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Old 04-20-2014, 05:41 PM   #16
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Makes sense, thanks
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Old 04-20-2014, 05:45 PM   #17
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over revving

I can't believe the depth of lack of genuine mechanical knowledge on here. Geeze. Your engine is probably fine if there is no knocking or any other new sounds. Someone suggested bent valves? Really? Why? The fixed and adjustable timing should prevent that. Have you ever over revved any of your other non sports/performance cars? Do you think Porsche REALLY put the red line right where you could injure the engine? Sorry, I'm just dumb struck with some of the SOL, did I hurt it, etc... questions about these cars. If they are that easily damaged, then they are crap. But, I don't that that is the case. I suspect the guys at the track push it over the limits regularly and those engines are the ones that are proclaimed to last the longest. I apologize for ranting, it just feels like we are talking about over revving a Ford Pinto or something inferior. WHat kind of sports car should put someone to walking on egg shells? If its that bad go trade your porsche for a honda civic. You can't hardly hurt those engines not matter the neglect.
CHeers!
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Old 04-20-2014, 06:40 PM   #18
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Quote:
Originally Posted by jdlmodelt View Post
I can't believe the depth of lack of genuine mechanical knowledge on here. Geeze. Your engine is probably fine if there is no knocking or any other new sounds. Someone suggested bent valves? Really? Why? The fixed and adjustable timing should prevent that. Have you ever over revved any of your other non sports/performance cars? Do you think Porsche REALLY put the red line right where you could injure the engine? Sorry, I'm just dumb struck with some of the SOL, did I hurt it, etc... questions about these cars. If they are that easily damaged, then they are crap. But, I don't that that is the case. I suspect the guys at the track push it over the limits regularly and those engines are the ones that are proclaimed to last the longest. I apologize for ranting, it just feels like we are talking about over revving a Ford Pinto or something inferior. WHat kind of sports car should put someone to walking on egg shells? If its that bad go trade your porsche for a honda civic. You can't hardly hurt those engines not matter the neglect.
CHeers!
I personally don't know the ins and outs of vario-fixed 5 chain OHC timing or whatever it's called, but do a lot of my own work. If I mechanically over-revved I would certainly be in here asking what potential damage I may have caused. Would you buy a over-revved car? How many over-revs are too many? Would you use that to get a lower price? Seems like a more reasonable question than which nearly identical oil to use...
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Old 04-20-2014, 06:53 PM   #19
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Query the ECU to see how many ignitions you saw and at what range. Report back and I'll share with you what I normally see from those durations spent at those ranges. Stretched timing chains and rod bolts are the most common from these experiences.

Does the car have a short shift kit installed? We call those economic stimulant kits here..
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Old 04-21-2014, 01:41 AM   #20
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All the best of luck OP.

I love my little F1 retrofitted paddled 986. I can dwshift right down to the 1st gear @100mph and the tiptronic won't do anything until its mgt system agrees it is safe to do so

Any Road Circuit killer lol



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