[Z06] Missed Shift!
Thread Starter
7th Gear
Joined: Feb 2002
Posts: 7
Likes: 0
From: Lansing MI
Missed Shift!
Driving home tonight I found myself on an open stretch of road. Went 90% throttle in 3rd then grabbed 4th. Unfortunately it wasn't 4th..ended up in 2nd instead. Car jerked and revs shot up. I immediately disengaged the clutch and saw the tach bounce off redline. Not sure if it went above redline. The car ran fine after this incident and idles smoothly but I'm shaking. :sad: Couple of questions:
1. Would the rev limiter kick in to prevent damage to the engine in this scenario?
2. Shouldn't the gearbox have prevented me from making an inappropriate shift?
3. If we do overrev, what's going to break first and how would I know if there's a problem?
4. How high can the LS6 rev before getting into trouble?
TIA :confused:
1. Would the rev limiter kick in to prevent damage to the engine in this scenario?
2. Shouldn't the gearbox have prevented me from making an inappropriate shift?
3. If we do overrev, what's going to break first and how would I know if there's a problem?
4. How high can the LS6 rev before getting into trouble?
TIA :confused:
Race Director
Joined: Aug 1999
Posts: 17,541
Likes: 2
From: Manhattan, KS Missing SoCal since 2005
Re: Missed Shift! (biggrin)
Driving home tonight I found myself on an open stretch of road. Went 90% throttle in 3rd then grabbed 4th. Unfortunately it wasn't 4th..ended up in 2nd instead. Car jerked and revs shot up. I immediately disengaged the clutch and saw the tach bounce off redline. Not sure if it went above redline. The car ran fine after this incident and idles smoothly but I'm shaking. :sad: Couple of questions:
1. Would the rev limiter kick in to prevent damage to the engine in this scenario?
2. Shouldn't the gearbox have prevented me from making an inappropriate shift?
3. If we do overrev, what's going to break first and how would I know if there's a problem?
4. How high can the LS6 rev before getting into trouble?
TIA :confused:
1. Would the rev limiter kick in to prevent damage to the engine in this scenario?
2. Shouldn't the gearbox have prevented me from making an inappropriate shift?
3. If we do overrev, what's going to break first and how would I know if there's a problem?
4. How high can the LS6 rev before getting into trouble?
TIA :confused:
2. If they can do CAGS to prevent one thing, why not the other? It could if it were designed that way, but it's not.
3. Probably the pushrods will bend - you'd hear it, most likely.
4. ???
[Modified by thevettenet CA, 6:06 PM 3/25/2002]
Racer
Joined: Mar 2002
Posts: 280
Likes: 0
From: Plano TX
Re: Missed Shift! (biggrin)
1. Would the rev limiter kick in to prevent damage to the engine in this scenario?
2. Shouldn't the gearbox have prevented me from making an inappropriate shift?
3. If we do overrev, what's going to break first and how would I know if there's a problem?
4. How high can the LS6 rev before getting into trouble?
TIA :confused:
2. Shouldn't the gearbox have prevented me from making an inappropriate shift?
3. If we do overrev, what's going to break first and how would I know if there's a problem?
4. How high can the LS6 rev before getting into trouble?
TIA :confused:
Burning Brakes
Joined: Nov 1999
Posts: 1,110
Likes: 0
From: Austin, TX
Re: Missed Shift! (biggrin)
Briggrin...
Sorry to hear of your misfortunate experience.:sad:
I hope you were lucky and dodged the bullet of disaster.:blueangel:
Do yourself (and your engine/trans) a favor, install a Ripper shifter and avoid this sort of incident all together. :yesnod:
Good luck!
VetterMan
Sorry to hear of your misfortunate experience.:sad:
I hope you were lucky and dodged the bullet of disaster.:blueangel:
Do yourself (and your engine/trans) a favor, install a Ripper shifter and avoid this sort of incident all together. :yesnod:
Good luck!
VetterMan
Le Mans Master
Joined: Dec 2001
Posts: 7,788
Likes: 6
From: Winchester TN
Cruise-In III Veteran
Cruise-In IV Veteran
Cruise-In V Veteran
St. Jude Donor '03-'04-'05-'06-'07-'11
Re: Missed Shift! (biggrin)
Hi biggrin -
No.
No.
Engine internal parts, Engine quits running.
Redline.
hope this helps.
best regards -
mqqn
1. Would the rev limiter kick in to prevent damage to the engine in this scenario?
2. Shouldn't the gearbox have prevented me from making an inappropriate shift?
3. If we do overrev, what's going to break first and how would I know if there's a problem?
4. How high can the LS6 rev before getting into trouble?
hope this helps.
best regards -
mqqn
Thread Starter
7th Gear
Joined: Feb 2002
Posts: 7
Likes: 0
From: Lansing MI
Re: Missed Shift! (mqqn)
Thanks guys!! Couldn't sleep and went out to drive the beast in my jammies at 11pm. Drove for 10 miles or so on city streets and highway. Everything seems OK. That was a close call! I'm going to look into the Rippie shifter tomorrow.
Melting Slicks
Joined: Apr 2000
Posts: 3,286
Likes: 8
From: San Jose California
Re: Missed Shift! (biggrin)
I'm glad the engine didn't break on you during your test drive. That would have been a fun walk in jammies if it had! I'm sure no explanations would have been asked by passing cars, neighbors,etc! ;)
Chuck
ps, I did a similar thing in my 12 cylinder XJS. I accidently went from drive to reverse at 70 mph. Yes, it did engage, the back end howling and jumping all over the road. No, I didn't feel stupid either :(I did have to rebuild the trans about a year later and have always been pretty sure that my little stunt may have brought it on). For what it's worth, I believe the LS6 engine would handle occasional runs up to 7500rpm without any problem. I doubt you actually spun it as high as that. The tires probably took most of the punishment. Not as bad as my freeway reverse trick. JUST DON'T DO IT AGAIN:D
Chuck
Chuck
ps, I did a similar thing in my 12 cylinder XJS. I accidently went from drive to reverse at 70 mph. Yes, it did engage, the back end howling and jumping all over the road. No, I didn't feel stupid either :(I did have to rebuild the trans about a year later and have always been pretty sure that my little stunt may have brought it on). For what it's worth, I believe the LS6 engine would handle occasional runs up to 7500rpm without any problem. I doubt you actually spun it as high as that. The tires probably took most of the punishment. Not as bad as my freeway reverse trick. JUST DON'T DO IT AGAIN:D
Chuck
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Racer
Joined: Dec 2001
Posts: 396
Likes: 0
From: Jackson MS
Re: Missed Shift! (biggrin)
I've done it a couple of times in my SS. It feels like your car is about to break apart. I know it has scare the crap out of me. Just be careful and very focused when shifting. :yesnod:
Drifting
Joined: Aug 2000
Posts: 1,698
Likes: 1
From: Chapin SC
Cruise-In II Veteran
Cruise-In III Veteran
Re: Missed Shift! (figment)
I did the same thing with my 01 (before the Ripper) and luckily avoided damage. I recommend having a competent mechanic take a look at all of your pushrods. That should not cost too much and it will help your peace-of-mind. As mentioned by others, get yourself a good shifter, I have not missed a gear, up or down, since installing the Ripper.
Instructor
Joined: Aug 2001
Posts: 104
Likes: 0
From: Doylestown PA
Re: Missed Shift! (biggrin)
Check the DIC for any codes there is one that logs if you hit 7400 I dont remberwhat it is but someone else will have it. If you did any mechanical damage the valves would probably show damage first. Check the fuel consumption numbers, if its down, you may have a bent valve.
BTW the engine should handle more than the redline by some margin and not break.
BTW the engine should handle more than the redline by some margin and not break.
Melting Slicks
Joined: Apr 2000
Posts: 3,286
Likes: 8
From: San Jose California
Re: Missed Shift! (jeffsherman)
Small blocks less stout and perhaps blue printed to a lesser extent routinely went 8000+ rpm. The fear with this engine is did the hydraulic lifters float enough to touch a piston to a valve? You can use an engine stethoscope, <$20 at Sears, or a long screw driver to listen for unusual valve train noises. You will have to remove the plastic covers, but you will be able to precisely locate any excessive lifter noises. It's not a bad idea to do this anyway just to familiarize yourself with the what the motor sounds like at various points when in good condition.
Chuck
Chuck
Racer
Joined: Mar 2002
Posts: 280
Likes: 0
From: Plano TX
Re: Missed Shift! (Chuck Harmon)
Good stuff:thumbup:
Press and hold options and then press Fuel 4 times while still holding the options button you must do this quickly. A message will appear saying "Diagonstics" then it will automatically read off the codes.
From: https://www.corvetteforum.com/techti...D=25&TopicID=1
[Modified by figment, 4:05 PM 3/26/2002]
Press and hold options and then press Fuel 4 times while still holding the options button you must do this quickly. A message will appear saying "Diagonstics" then it will automatically read off the codes.
From: https://www.corvetteforum.com/techti...D=25&TopicID=1
[Modified by figment, 4:05 PM 3/26/2002]
Thread Starter
7th Gear
Joined: Feb 2002
Posts: 7
Likes: 0
From: Lansing MI
Re: Missed Shift! (figment)
You guys are incredible! It's like having a room of mechanics. The other forums I've been in spend all the time talking about color matching the interior leather, wood etc. and how with a few simple mods they can 'take' a C5. Right............Thanks again!!
Thread Starter
7th Gear
Joined: Feb 2002
Posts: 7
Likes: 0
From: Lansing MI
Re: Missed Shift! (biggrin)
Just did the diagnostic. Got code "60IPC U1160H" Went to http://www.c5-corvette.com/C5Dyno.htm, clicked on "IPC Display Codes" and basically it's a fault of the Instrument Panel Cluster loss of communication with the left door control module ie. a nothing fault. The list on that webpage is great. Maybe everyone should run a diagnostic to see what's cooking in their car--there's so electronics going on we or at least I don't realize. Makes something like an L88 that much 'purer'.
Melting Slicks
Joined: Apr 2000
Posts: 3,286
Likes: 8
From: San Jose California
Re: Missed Shift! (biggrin)
biggrin,
Quote:
Makes something like an L88 that much 'purer'.
________________________________________ ______________________
My feelings exactly. You don't need to be a EE to work on the 69.
By the way, I went out to my Z to see about getting a benchmark vacuum reading for you. An erratic needle would possibly suggest a bent valve, but with the lopey idle, I wanted to see just how erratic a normal LS6 is. Where does one hook up such a device??? It wouldn't surprise me if there are no vacuum ports, only sensors. Does anyone know? Makes me appreciate the simplicity of the L88 all the more!
After taking off the beautiful red plastic covers, I also recognized that I can probably pull out the L88 in less time than I could get to the valves on the Z to adjust them. With advances in technology, you win some and you lose some! :smash:
This reminded me a friend who was looking at touring bikes. The Harley Store said that the bike is so simple, you can virtually rebuild the engine on the side of the road. The BMW Store said you would never need to worry about having to! I hope this applies with the new Vettes! ;)
Chuck
Quote:
Makes something like an L88 that much 'purer'.
________________________________________ ______________________
My feelings exactly. You don't need to be a EE to work on the 69.
By the way, I went out to my Z to see about getting a benchmark vacuum reading for you. An erratic needle would possibly suggest a bent valve, but with the lopey idle, I wanted to see just how erratic a normal LS6 is. Where does one hook up such a device??? It wouldn't surprise me if there are no vacuum ports, only sensors. Does anyone know? Makes me appreciate the simplicity of the L88 all the more!
After taking off the beautiful red plastic covers, I also recognized that I can probably pull out the L88 in less time than I could get to the valves on the Z to adjust them. With advances in technology, you win some and you lose some! :smash:
This reminded me a friend who was looking at touring bikes. The Harley Store said that the bike is so simple, you can virtually rebuild the engine on the side of the road. The BMW Store said you would never need to worry about having to! I hope this applies with the new Vettes! ;)
Chuck
Melting Slicks
Joined: Dec 2001
Posts: 2,410
Likes: 0
From: Boulder CO.
Re: Missed Shift! (Chuck Harmon)
You should be fine. In cases like these, the pushrods are the weakest link.
If you've done any damage to the engine, you would've known by now.
Chalk this one on lady luck! :yesnod:
[Modified by Wicked LT1, 7:44 PM 3/26/2002]
If you've done any damage to the engine, you would've known by now.
Chalk this one on lady luck! :yesnod:
[Modified by Wicked LT1, 7:44 PM 3/26/2002]
