11-15-2021, 09:34 AM
|
#61 (permalink)
|
Too many cars
Join Date: Oct 2009
Location: New York State
Posts: 1,597
Thanks: 1,352
Thanked 797 Times in 475 Posts
|
Quote:
Originally Posted by SDMCF
It is of course difficult to turn the car around with the engine off so I rarely do that (it involves a handbrake turn in my driveway).
|
I can do it! My driveway is slightly downhill from the road. I coast in, quickly turn back into the road, and then coast backwards into the driveway.
I've made u-turns on hills with the engine off too!
__________________
2000 Honda Insight
2000 Honda Insight
2000 Honda Insight
2006 Honda Insight (parts car)
1988 Honda CRXFi
1994 Geo Metro
|
|
|
Today
|
|
|
Other popular topics in this forum...
|
|
|
11-15-2021, 10:05 AM
|
#62 (permalink)
|
Somewhat crazed
Join Date: Sep 2013
Location: 1826 miles WSW of Normal
Posts: 4,323
Thanks: 517
Thanked 1,172 Times in 1,034 Posts
|
Quote:
Originally Posted by Gasoline Fumes
. Of course if you can perfectly match revs every time, there won't be any wear. Rev matching with the clutch would be the best. My Insight demands this to downshift into 1st or 2nd gear. It'll growl at me if I don't!
|
Disengaging the clutch removes the engine speed from the gear. The idea is to match engine speed to the gear set. My schoolbus had an input shaft brake for shifts which is why you double clutched it between gears and stomped the pedal to the floor every time
__________________
casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
|
|
|
The Following User Says Thank You to Piotrsko For This Useful Post:
|
|
11-15-2021, 10:16 AM
|
#63 (permalink)
|
Too many cars
Join Date: Oct 2009
Location: New York State
Posts: 1,597
Thanks: 1,352
Thanked 797 Times in 475 Posts
|
Quote:
Originally Posted by Piotrsko
Disengaging the clutch removes the engine speed from the gear. The idea is to match engine speed to the gear set. My schoolbus had an input shaft brake for shifts which is why you double clutched it between gears and stomped the pedal to the floor every time
|
Thanks, I forgot to mention double-clutching! I'm so used to it that I don't even think about it.
__________________
2000 Honda Insight
2000 Honda Insight
2000 Honda Insight
2006 Honda Insight (parts car)
1988 Honda CRXFi
1994 Geo Metro
|
|
|
11-15-2021, 04:00 PM
|
#64 (permalink)
|
High Altitude Hybrid
Join Date: Dec 2020
Location: Gunnison, CO
Posts: 2,075
Thanks: 1,128
Thanked 583 Times in 462 Posts
|
Quote:
Originally Posted by Piotrsko
Disengaging the clutch removes the engine speed from the gear. The idea is to match engine speed to the gear set. My schoolbus had an input shaft brake for shifts which is why you double clutched it between gears and stomped the pedal to the floor every time
|
I also double clutched my school bus. Apparently I was the only one who knew how to do it, since everyone else just pushed on the shifter and waited a good 3 or 4 seconds for the synchros to do the job. I'd get comments on how I could race in a bus professionally if I wanted to.
In my cars I usually would double clutch the downshifts as the upshifts didn't seem to help that much.
__________________
|
|
|
The Following 2 Users Say Thank You to Isaac Zachary For This Useful Post:
|
|
11-15-2021, 04:15 PM
|
#65 (permalink)
|
Master EcoModder
Join Date: Jul 2017
Location: Memphis, Tn
Posts: 463
Thanks: 320
Thanked 107 Times in 81 Posts
|
Quote:
Originally Posted by Isaac Zachary
I also double clutched my school bus. Apparently I was the only one who knew how to do it, since everyone else just pushed on the shifter and waited a good 3 or 4 seconds for the synchros to do the job. I'd get comments on how I could race in a bus professionally if I wanted to.
In my cars I usually would double clutch the downshifts as the upshifts didn't seem to help that much.
|
It seems to be easier for the synchros to bring the clutch/input shaft RPM down than up. When double clutch downshifting or revving to get back into gear, it seems like slightly overshooting the RPM and letting the synchros bring it down a little works better than slightly underrevving and forcing the synchros to bring the clutch/input shaft RPM up.
If I had to guess why, I'd say because the synchros have friction and oil drag on their side bringing the RPM down while they are fighting friction and oil drag to bring RPM up.
Last edited by EcoCivic; 11-15-2021 at 04:20 PM..
|
|
|
The Following 2 Users Say Thank You to EcoCivic For This Useful Post:
|
|
11-16-2021, 02:54 AM
|
#66 (permalink)
|
EcoModding Lurker
Join Date: Jun 2015
Location: Finland
Posts: 69
Thanks: 1
Thanked 21 Times in 15 Posts
|
Quote:
Originally Posted by Gasoline Fumes
I can do it! My driveway is slightly downhill from the road. I coast in, quickly turn back into the road, and then coast backwards into the driveway.
|
Whilst I can do it I find it is not popular with my passengers and it makes a mess of the driveway so it is not something I do often.
|
|
|
The Following User Says Thank You to SDMCF For This Useful Post:
|
|
11-16-2021, 07:49 PM
|
#67 (permalink)
|
Master Novice
Join Date: Jan 2008
Location: SE USA - East Tennessee
Posts: 2,314
Thanks: 427
Thanked 616 Times in 450 Posts
|
I'm in E TN which is pretty darned hilly, clutch out and into gear for P&G and have since I bought the truck...in 1987. We were pretty broke for a long time so I drove the truck like gas was way more expensive than it really was. I was P&G before I even knew it had a name.
Teaching the last kid to drive stick finally cooked the first clutch at over 200,000 miles, but the rest of the tranny sounds fine. I might need to replace a bushing in the shifter but the box itself feels as good as it ever did.
Above about 40mph or so, reengaging in top gear, I'll give the gas a quick stab if the engine is running but it's 50/50 on a long downhill I turned it off, so there's nothing to stab. Clutch, gear, let 'er rip.
__________________
Lead or follow. Either is fine.
|
|
|
The Following User Says Thank You to elhigh For This Useful Post:
|
|
11-20-2021, 10:00 PM
|
#68 (permalink)
|
Master EcoModder
Join Date: Jul 2017
Location: Memphis, Tn
Posts: 463
Thanks: 320
Thanked 107 Times in 81 Posts
|
I accidentally tried engine off coasting earlier today (my knee hit the key and shut it off while I was coasting down hill at ~50 MPH). I tried to start it by shifting back into 5th gear which worked perfectly fine with no grinding. Not sure how it went into 5th gear perfectly from 0 RPM but kicked me out that time I tried to shift back into gear from idle. Could a bad/worn synchro work only intermittently?
|
|
|
11-20-2021, 10:28 PM
|
#69 (permalink)
|
High Altitude Hybrid
Join Date: Dec 2020
Location: Gunnison, CO
Posts: 2,075
Thanks: 1,128
Thanked 583 Times in 462 Posts
|
Quote:
Originally Posted by EcoCivic
I accidentally tried engine off coasting earlier today (my knee hit the key and shut it off while I was coasting down hill at ~50 MPH). I tried to start it by shifting back into 5th gear which worked perfectly fine with no grinding. Not sure how it went into 5th gear perfectly from 0 RPM but kicked me out that time I tried to shift back into gear from idle. Could a bad/worn synchro work only intermittently?
|
What's the weather been like? I've noticed that if the transmission is cold it can be harder to get things to mesh right in some cars. It might be the other way around in others. If one day it was cold and another hot, maybe that's the reason. Or if you had driven around long enough to warm it up that one time.
__________________
|
|
|
The Following User Says Thank You to Isaac Zachary For This Useful Post:
|
|
11-20-2021, 11:51 PM
|
#70 (permalink)
|
Master EcoModder
Join Date: Jul 2017
Location: Memphis, Tn
Posts: 463
Thanks: 320
Thanked 107 Times in 81 Posts
|
Quote:
Originally Posted by Isaac Zachary
What's the weather been like? I've noticed that if the transmission is cold it can be harder to get things to mesh right in some cars. It might be the other way around in others. If one day it was cold and another hot, maybe that's the reason. Or if you had driven around long enough to warm it up that one time.
|
Great point, I didn't think of trans temp. That could be it. One of the gauges I installed is monitoring trans temp, so I'll keep an eye on it and see if I notice any patterns.
It seems like in normal driving the transmission oil temp eventually stabilizes at around 50 degrees over outside temp, but it takes quite a while to get there.
|
|
|
|