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1. overdrive question (score: 1): Author: "Jack W. Drews" <vinttr4@geneseo.net>; Date: Wed, 21 Sep 2005 06:11:28 -0500; I've never gotten into the innards of the various types of overdrives. Most people I know who race their TR's with an overdrive use the "A" type. Is the "A" superior to the "J" type for racing? Why?; /html/fot/2005-09/msg00335.html (7,331 bytes)
2. RE: overdrive question (score: 1): Author: "barry rosenberg" <britcars@bellsouth.net>; Date: Wed, 21 Sep 2005 07:43:08 -0400; I used to believe so but we now use a late TR6 overdrive box and it is great. The "A" type has bigger clutches to hold the power but also weighs a lot more and has more internal parasitic drag. The "; /html/fot/2005-09/msg00336.html (8,253 bytes)
3. Re: overdrive question (score: 1): Author: "Charly Mitchel" <charly@mitchelplumbing.com>; Date: Wed, 21 Sep 2005 07:49:36 -0700; Everything I read states the 'J' type is superior. I've also heard the 'A' type can be built with better parts as such from Jags or other more powerful cars. I run a 'J' type in my 6 and have no prob; /html/fot/2005-09/msg00338.html (8,371 bytes)
4. RE: overdrive question (score: 1): Author: "Randall Young" <ryoung@navcomtech.com>; Date: Wed, 21 Sep 2005 11:43:56 -0700; I've never raced with either, but I've driven both on the street. I would guess the main advantage is the faster shifting of the A-type, due to the presence of the accumulator. The A-type in my TR3A; /html/fot/2005-09/msg00339.html (9,102 bytes)
5. Re: overdrive question (score: 1): Author: Chuck Arnold <chuck.arnold@oracle.com>; Date: Wed, 21 Sep 2005 12:04:31 -0700; I asked John Espisiyo of Quantum Mechanics about A versus J. Here is his resonse, followed by one on A type avaiability/price. I am sticking with the`J till it goes. "Hi and thanks for your inquiry.; /html/fot/2005-09/msg00340.html (10,358 bytes)
6. Re: overdrive question (score: 1): Author: Fubog1@aol.com; Date: Wed, 21 Sep 2005 15:50:19 EDT; Everything I read states the 'J' type is superior. I've also heard the 'A' type can be built with better parts as such from Jags or other more powerful cars. I run a 'J' type in my 6 and have no prob; /html/fot/2005-09/msg00341.html (8,268 bytes)
7. Re: Overdrive question (score: 1): Author: "SHANE Ingate" <hottr6@hotmail.com>; Date: Wed, 21 Sep 2005 15:50:24 -0400; I have no direct experience, but like others, I have heard that the A is faster shifting than the J. I have also heard that the A leaks like a sieve and is more expensive to boot. The biggest differe; /html/fot/2005-09/msg00342.html (9,216 bytes)
8. RE: Overdrive question (score: 1): Author: "Randall Young" <ryoung@navcomtech.com>; Date: Wed, 21 Sep 2005 13:06:10 -0700; Something wrong with these numbers ... you're comparing gearboxes, not overdrives. Unless you've modified to add OD in 1st gear, the OD makes no difference to 1st gear ratio. And you've left out the; /html/fot/2005-09/msg00343.html (8,474 bytes)
9. RE: overdrive question (score: 1): Author: atenglish@mindspring.com; Date: Wed, 21 Sep 2005 16:02:41 -0400 (GMT-04:00); I have found just the opposite than what is described below. Until the Walter Mitty Challenge this past April , I had always raced with an 'A' Type overdrive. When the tranny that was supposed to be; /html/fot/2005-09/msg00344.html (10,378 bytes)
10. Re: overdrive question (score: 1): Author: "Jeff Snook" <jsnook@wcnet.org>; Date: Wed, 21 Sep 2005 16:50:49 -0400; I'll confirm what Glen has said about the instant shift with an A overdrive. Just raced my TR3A at Grattan, and was using 2nd/3rd OD consistently. It worked flawlessly and helped in those areas where; /html/fot/2005-09/msg00345.html (9,649 bytes)
11. Re: overdrive question (score: 1): Author: BillDentin@aol.com; Date: Wed, 21 Sep 2005 17:36:26 EDT; Especially in 2nd. Mike Belfer used to holler at me for using OD in 2nd. I always listened politely, but it was difficult not to use it coming out of FIVE at ROAD AMERICA when you were trying to pass; /html/fot/2005-09/msg00346.html (9,327 bytes)
12. RE: overdrive question (score: 1): Author: "Terry and Cindy" <Roadandtrack2@hypermax.net.au>; Date: Thu, 22 Sep 2005 08:29:04 +1000; I have been fixing these units since new. The A & J are not really comparable and its not reasonable to make detailed technical comparisons. However, the A has an active accumulator which stores hydr; /html/fot/2005-09/msg00347.html (9,214 bytes)
13. overdrive question (score: 1): Author: Guyots3@wmconnect.com; Date: Thu, 22 Sep 2005 00:28:15 EDT; In response to the above: The J-type on my Vitesse, with TR6/Dolomite Sprint transmission housing works just fine. It has slightly stronger springs/pressure and here is my Triumph-friendly engineer f; /html/fot/2005-09/msg00355.html (10,715 bytes)
14. RE: overdrive question (score: 1): Author: "Randall Young" <ryoung@navcomtech.com>; Date: Thu, 22 Sep 2005 10:48:07 -0700; With respect, Leon, this suggests to me that your friend is confused about how J-type overdrives work. The pressure relief valve is not in operation when the overdrive engages, and hence adjusting t; /html/fot/2005-09/msg00366.html (8,791 bytes)
15. Re: overdrive question (score: 1): Author: Larry Young <larry.young@pobox.com>; Date: Wed, 21 Sep 2005 07:35:05 -0500; I used to race with an overdrive and I'm planning to go back to it. The big difference between A and J types is that the A type uses an accumulator which is held at high pressure by the pump. The J t; /html/fot/2005-09/msg00375.html (8,194 bytes)
16. overdrive question (score: 1): Author: Guyots3@wmconnect.com; Date: Fri, 23 Sep 2005 02:07:32 EDT; Leave it with me and I will put it to him and see hat he says. Yes he really does exist - in England - but he is not a member of FOT. Regards Leon; /html/fot/2005-09/msg00377.html (9,451 bytes)
17. Re: overdrive question (score: 1): Author: Chuck Arnold <chuck.arnold@oracle.com>; Date: Fri, 23 Sep 2005 07:53:21 -0700; Anybody know how you increase the pressure in an j Type?; /html/fot/2005-09/msg00384.html (9,063 bytes)
18. RE: overdrive question (score: 1): Author: Guyots3@wmconnect.com; Date: Fri, 23 Sep 2005 11:11:43 EDT; On Thu, 22 Sep 2005 10:48:07 -0700 Randall wrote: RE: overdrive question and quoted from my email, (which I had quoted from a friend) With respect, Leon, this suggests to me that your friend is confu; /html/fot/2005-09/msg00385.html (9,426 bytes)
19. RE: overdrive question (score: 1): Author: "Randall" <ryoung@navcomtech.com>; Date: Fri, 23 Sep 2005 09:02:18 -0700; Well, I guess we'll have to agree to disagree then. When the J-type is not engaged, the pressure in the entire system is relieved to approximately 20 psi, even on the Stag. Pages 40.00.09 and 40.00.; /html/fot/2005-09/msg00387.html (10,613 bytes)
20. Re: overdrive question (score: 1): Author: Guyots3@wmconnect.com; Date: Sat, 24 Sep 2005 10:20:59 EDT; Ed, Please read what I wrote, I personally did not pen these words, I was merely quoting from an engineer friend. My knowledge of the operating of the overdrive is limited. Thanks Leon; /html/fot/2005-09/msg00394.html (8,170 bytes)

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