Recent Topics
Picked up a used Honda Push Mower today
by redhat - 05/26/20 02:43 PM
Mevotech vs. MOOG
by pbm - 05/26/20 01:47 PM
Any experience with MU-MIX ?
by henni - 05/26/20 01:22 PM
RA code
by Koncrete_Cam - 05/26/20 12:12 PM
best alternative to a group 79? hopefully more cca
by apollo18 - 05/26/20 11:25 AM
Gas Prices Are Going Up
by BlueOvalFitter - 05/26/20 10:49 AM
One way to "fix" a loud vehicle exhaust
by ZZman - 05/26/20 10:01 AM
Limited slip rear end in Tacoma
by taintedtattoo - 05/26/20 09:45 AM
Best Ball Joint and Pitman Arm Grease?
by 2015_PSD - 05/26/20 09:31 AM
12 volt air compressor
by John_Conrad - 05/26/20 08:42 AM
Battery Charging Compatibility
by cb450sc - 05/26/20 07:11 AM
Techron With GDI Engines Intake Vale Cleaning ?
by ChrisD46 - 05/26/20 06:58 AM
Current produced by 3 AA batteries
by MoneyJohn - 05/26/20 06:21 AM
I need advice on Toyota V6 timing belt
by michaelluscher - 05/26/20 06:13 AM
Ignition Wire Suggestions?
by GemStater - 05/26/20 02:22 AM
Calling Prius Owners
by rrretiree7 - 05/26/20 02:12 AM
Environmentally friendly gas can rant
by IMSA_Racing_Fan - 05/26/20 12:58 AM
Left Hand Drillbits
by Snagglefoot - 05/25/20 10:32 PM
Newest Members
MechEnDawg, jimbacot, MowerVet, RonWSmith3, LJB
71535 Registered Users
Who's Online Now
103 registered members (53' Stude, 2015_PSD, ABN_CBT_ENGR, 762fermeandyou, 1978elcamino, 2004tdigls, 9 invisible), 2,656 guests, and 67 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics305,904
Posts5,282,493
Members71,535
Most Online4,538
Jan 20th, 2020
Donate to BITOG
Print Thread
Hop To
Page 3 of 3 1 2 3
Re: Double clutch shifting, what does it entail? [Re: ecotourist] #5380664 03/19/20 07:09 PM
Joined: Oct 2010
Posts: 7,814
A
A_Harman Offline
Offline
A
Joined: Oct 2010
Posts: 7,814
Originally Posted by ecotourist
Originally Posted by hallstevenson
I think it was Olas that said it above, you use your fingers on the gear selector, not grab it firmly and slam it between gears. .....Do it so lightly that you can feel when it will slip in nicely. No racing-style, heel-and-toe or throttle blipping is really needed with practice.

I've heard it described as "wishing it into the next gear". I do it all the time - two fingers on the gear lever. I know how to shift fast, I just don't do it.


Don't watch a YouTube video of Ronnie Sox powershifting his Cuda! Drag racing is abusive only if its done right.


2008 Dodge Ram 3500 diesel/G56
1985 Z51 Corvette track car 355/6-speed
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel/NV4500+GV
1972 GMC 1500 shortbed project truck 307/SM465
Re: Double clutch shifting, what does it entail? [Re: Gasbuggy] #5380747 03/19/20 08:50 PM
Joined: Sep 2017
Posts: 573
C
Cdn17Sport6MT Offline
Offline
C
Joined: Sep 2017
Posts: 573
Originally Posted by Gasbuggy
First off, double-clutching is not for synchronized transmissions that work properly...


You say that with an air of sureness. To which I answer: Double-clutching is only for synchromesh transmissions with knackered synchro's that were caused by someone NOT double-clutching (down)... especially 2nd gear synchro's.

Hey, YMMV. You drive the way only YOU know best; I will drive the way I know is best.


Mazda6 GX (i.e.Sport), 6MT, '17
Moto Guzzi 850 T5 (Euro version), '85
Honda Civic Si (EX 2 dr in the 'States), A/T, '97
Toyota Camry CE, 5MT, '99
Toyota Corolla VE, 4AT, '99
VW (Type2) Kombi, 4MT, '79
Re: Double clutch shifting, what does it entail? [Re: Cdn17Sport6MT] #5382604 03/22/20 05:16 AM
Joined: Aug 2009
Posts: 2,612
G
Gasbuggy Offline
Offline
G
Joined: Aug 2009
Posts: 2,612
Originally Posted by Cdn17Sport6MT
Originally Posted by Gasbuggy
First off, double-clutching is not for synchronized transmissions that work properly...


You say that with an air of sureness. To which I answer: Double-clutching is only for synchromesh transmissions with knackered synchro's that were caused by someone NOT double-clutching (down)... especially 2nd gear synchro's.

Hey, YMMV. You drive the way only YOU know best; I will drive the way I know is best.



Double Clutching on a downshift seems pointless, all you'll be doing is forcing the synchro's to work overtime trying to make up for that idle RPM your engine will fall to while you're spending all that time pushing the clutch in and out twice. You'll be forcing 2nd or whatever gear to catch up to. An intelligent foot on the throttle is what a well-timed downshift needs to minimize the wear and tear. Maybe you're doing both.


Cadillac CTS-V 6.2L 10w30PP
Volvo P1800 Euro L
76 Mercedes 300D Rotella T4
Series III Land Rover VWB
02 Yukon 10w30 PP
01 P71 M1 EP-HM 0W20
95 Accord - 386k. Mobil 2 RIP
Re: Double clutch shifting, what does it entail? [Re: HyundaiAbuser] #5383099 03/22/20 04:48 PM
Joined: Sep 2017
Posts: 573
C
Cdn17Sport6MT Offline
Offline
C
Joined: Sep 2017
Posts: 573
But I don't let the rpm fall to idle. I raise the rpm to (at least) the point where it needs to be in the lower gear (and, foot-on-the-throttle) I leave it at that rpm and keep driving at that same rpm after the downshift from neutral is made. It's not a blip; it's a raise-and-hold. And, you need to make a decisive (i.e. quick) clutch-in, shift from neutral to the lower gear, clutch out "move" or the rpm of the counter shaft WILL fall... so sometimes you partways overlap those steps... like shift out of neutral at the clutch-in half-way point. Proof is in the pudding; doing this, gear lever force is 'real low... which says the synchro is not working hard at all. I grant you that selecting the correct rpm takes practise and knowing your car well.

Last edited by Cdn17Sport6MT; 03/22/20 04:50 PM.

Mazda6 GX (i.e.Sport), 6MT, '17
Moto Guzzi 850 T5 (Euro version), '85
Honda Civic Si (EX 2 dr in the 'States), A/T, '97
Toyota Camry CE, 5MT, '99
Toyota Corolla VE, 4AT, '99
VW (Type2) Kombi, 4MT, '79
Re: Double clutch shifting, what does it entail? [Re: Cdn17Sport6MT] #5383117 03/22/20 05:00 PM
Joined: Sep 2017
Posts: 573
C
Cdn17Sport6MT Offline
Offline
C
Joined: Sep 2017
Posts: 573
The other comment to make - i.e. doing this on a track at a Driver's Ed. session: if you are braking, you do it while braking [i.e. you "heel-and-toe (an incorrectly named process 'cuz it doesn't involve your heel)] - and so it doesn't take up any additional time because you have to brake during that time anyways. Having said this, it's not easy to do. In Porsche circles, cars with their PDK are quicker on the course because i) their pdk's are so intuitive (left in automatic) and drivers can then concentrate solely on lines and car control and ii) their pdk's shift quicker than the manuals. Saying this, it's not always JUST about speed. Really mastering a good manual trans is pretty gratifying.


Mazda6 GX (i.e.Sport), 6MT, '17
Moto Guzzi 850 T5 (Euro version), '85
Honda Civic Si (EX 2 dr in the 'States), A/T, '97
Toyota Camry CE, 5MT, '99
Toyota Corolla VE, 4AT, '99
VW (Type2) Kombi, 4MT, '79
Page 3 of 3 1 2 3
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™