|
08-06-2015, 06:53 AM | #11 | |
VIP Member
Join Date: Nov 2009
Location: Egg Harbor Township, NJ
Posts: 1,420
Likes: 1,269
Liked 3,861 Times in 456 Posts
|
Re: Shutting car off while in gear
Quote:
I use the B&M Hammer which is a ratchet shifter so I can only go one gear at a time which makes up to neutral impossible. It's not a huge deal I do run an o2 sensor in the collector that records the entire run and that has helped tremendously in tuning but my next objective is to get each individual plug reading the same which is a great perk of EFI. Last edited by Bobby Fazio; 08-06-2015 at 07:02 AM. |
|
08-07-2015, 05:22 PM | #12 | |
Sponsor
Join Date: Jun 2013
Location: Maryland
Posts: 67
Likes: 0
Liked 9 Times in 1 Post
|
Re: Shutting car off while in gear
Quote:
|
|
08-07-2015, 07:45 PM | #13 |
Senior Member
Join Date: Dec 2006
Posts: 589
Likes: 0
Liked 0 Times in 0 Posts
|
Re: Shutting car off while in gear
I've been told in a TH400 clicking it into neutral causes the driveshaft becoming the driver and the way it multiples will cause one of the drums to spin to 20000 rpm+ and it can go boom.
__________________
Harry6674 |
08-08-2015, 12:39 AM | #14 |
Junior Member
Join Date: Nov 2013
Posts: 91
Likes: 0
Liked 0 Times in 0 Posts
|
Re: Shutting car off while in gear
Could somebody explain what "clean neutral" means. I have a reasonable understanding of automatic transmissions and have heard this term many times but never an explanation. Thank you, Louis Jeffery
|
08-08-2015, 12:22 PM | #15 | |
Member
Join Date: Feb 2008
Location: Black Creek, BC Canada
Posts: 314
Likes: 63
Liked 142 Times in 69 Posts
|
Re: Shutting car off while in gear
Quote:
Jim Mantle V/SA 6632 |
|
08-10-2015, 10:28 AM | #16 |
Senior Member
Join Date: Sep 2006
Location: Bellevue Ohio
Posts: 985
Likes: 0
Liked 12 Times in 9 Posts
|
Re: Shutting car off while in gear
I've put many runs on both a Coan XLT-350 and a Pro-flite with clean neutrals shutting off above 10,000 RPM. Never had an issue with either, tear down at end of season shows no signs of unusual wear. I have noticed it seems to take longer for the T-350 to "let go" of the engine not sure why but never caused a problem.
__________________
Joe Buchanan SS/BX 3117 |
08-10-2015, 12:00 PM | #17 |
Senior Member
Join Date: Feb 2002
Location: Southeast Michigan
Posts: 895
Likes: 67
Liked 230 Times in 108 Posts
|
Re: Shutting car off while in gear
The reason it takes so long to dump the clutch at high rpm is due to the fluid in the clutch drum. As the drum spins the fluid is centrifically forced to the OD of the drum and effectively creates a higher pressure on the clutch piston. The feed for the clutch is closer to the centerline of the piston. When you want to dump the clutch, a valve opens and exhausts this feed channel, the problem is that the spinning drum keeps high pressure at the OD of the piston, and limits how much oil can be moved to the centerline of the piston. Most pistons or drums have a small check ball that is machined close to the OD of the drum. When the clutch pressure drops to a designed value the check ball comes off its seat and exhausts the clutch oil. At high rpm the clutch centrifical oil pressure may be too high to unseat the check ball and basically keeps the clutch on. Some tranny builders know this and drill a small hole (constant bleed) near this check ball, That is a "fix" to try and get the clutch off quickly, and is unaffected by rpm.
|
|
|