grinding into 6th after woot
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From: South Carolina
grinding into 6th after woot
well its happened a bit now, when i go through the gears at woot like 1st,2nd,3rd and let off the gas and try to shift into 6th it ginds. so i have had to ben able to put it in 5th then shift to sixth. it happens all the time when i go through 2nd and i go to put it in 6th it grinds. anyone have any ideas? i dont have a problem puting it in 5th then 6th but just wondering what could be wrong. but when i drive normal getting up to speed and go from 5th to 6th its fine. no grinding. just when i go woot. anyone got any ideas? thanks!!!!!
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SKIP SHIFTING IS BRUTAL ON SYNCHRONIZERS
HONDA SERVICE NEWS
Reference Number(s): HSN0106-01, Date of Issue: January 1, 2006
SERVICE INFORMATION
Gear ratios in 6-speed manual trannies are spaced close together so you can keep the engine speed in its optimum range for max power and acceleration. Shifting to the next higher or lower gear in a close-ratio tranny causes small changes in engine speed.
Shifting a close-ratio tranny through its gears by the numbers puts a very small load on the synchronizers since they only have to make small changes to the speed of the mainshaft and the clutch disc.
Some drivers, though, like to skip shift so they don't have to work the clutch pedal and shift lever as much. They like to accelerate in 1st gear, then pop it into 3rd gear, then into 5th or 6th. Skip shifting, though, is really brutal on synchronizers; it puts a higher demand on them than they were designed to take. Skip shifting can cause premature synchronizer wear that can cause the gears to grind when you shift up or down.
If you've got a vehicle in your shop for repeated damage to the synchronizers, go for a test-drive with your service customer to see if he or she is guilty of skip shifting. If that's the case, remind him or her skip shifting can be an expensive habit to break. Any repairs due to skip shifting may be reviewed and debited by your DPSM.
HONDA SERVICE NEWS
Reference Number(s): HSN0106-01, Date of Issue: January 1, 2006
SERVICE INFORMATION
Gear ratios in 6-speed manual trannies are spaced close together so you can keep the engine speed in its optimum range for max power and acceleration. Shifting to the next higher or lower gear in a close-ratio tranny causes small changes in engine speed.
Shifting a close-ratio tranny through its gears by the numbers puts a very small load on the synchronizers since they only have to make small changes to the speed of the mainshaft and the clutch disc.
Some drivers, though, like to skip shift so they don't have to work the clutch pedal and shift lever as much. They like to accelerate in 1st gear, then pop it into 3rd gear, then into 5th or 6th. Skip shifting, though, is really brutal on synchronizers; it puts a higher demand on them than they were designed to take. Skip shifting can cause premature synchronizer wear that can cause the gears to grind when you shift up or down.
If you've got a vehicle in your shop for repeated damage to the synchronizers, go for a test-drive with your service customer to see if he or she is guilty of skip shifting. If that's the case, remind him or her skip shifting can be an expensive habit to break. Any repairs due to skip shifting may be reviewed and debited by your DPSM.
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Joined: Apr 2009
Posts: 2,629
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From: Windsor, CA
As others have mentioned, you are putting a strain on your synchros that they can't handle.
When you shift at redline from a lowish gear (say, 3rd), the input shaft is spinning at "redline" speed. Now you try to engage sixth and the input shaft is still spinning roughly TWICE as fast as it should be to engage the gear. The only thing that will slow it down is the synchros, and that's a hell of a lot to ask. Your alternates are to engage the clutch, put it in neutral and waaaaaait a while before engaging sixth to give the input shaft time to slow down from friction. Or you can engage your clutch and run the shifter through the gears until you get to sixth before letting the clutch out again. Each time you engage a gear, the input shaft slows down a bit, so when you get to sixth the remaining difference in speed is very small and it won't grind.
Understanding the relationship between clutch/input shaft/shifter/output shaft answered countless questions for me and improved my driving. I learned about it from reading the Skip Barber book "Going Faster."
When you shift at redline from a lowish gear (say, 3rd), the input shaft is spinning at "redline" speed. Now you try to engage sixth and the input shaft is still spinning roughly TWICE as fast as it should be to engage the gear. The only thing that will slow it down is the synchros, and that's a hell of a lot to ask. Your alternates are to engage the clutch, put it in neutral and waaaaaait a while before engaging sixth to give the input shaft time to slow down from friction. Or you can engage your clutch and run the shifter through the gears until you get to sixth before letting the clutch out again. Each time you engage a gear, the input shaft slows down a bit, so when you get to sixth the remaining difference in speed is very small and it won't grind.
Understanding the relationship between clutch/input shaft/shifter/output shaft answered countless questions for me and improved my driving. I learned about it from reading the Skip Barber book "Going Faster."