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#11 Re: How tough is the std 1200 auto?
TOSSER Posted on: 2008/10/15 10:14
Hey Revhead, is that TCE in Geelong???


#12 Re: How tough is the std 1200 auto?
olboy Posted on: 2008/10/15 10:39
I think the quickest way to launch is to bring the revs up while in neutral then drop it into 1st but thats alittle hard on the locked diff. The car works very well in motorkanas both dirt and tar. I have hooked the hydro handbrake up to a pedal similar to a clutch pedal so its very easy to drive. when you want to do a handbrake turn you use the clutch/brake just like in a manul only you can keep two hands on the wheel. very easy to control. I've converted my last two cars from manul to auto.
olboy


#13 Re: How tough is the std 1200 auto?
steveo Posted on: 2008/10/15 10:49
obvoiusly it handles that sort of punishment, dropping it from neutral into drive, as long as you don't go too crazy i'm assuming.

Its a good idea the way you have set up your hydrolic handbrake.


#14 Re: How tough is the std 1200 auto?
TOSSER Posted on: 2008/10/15 11:43
Olboy, if you leave it in first and redline it, does the auto change up to second(like some autos do) or does it stay in first and not change up until you shift?


#15 Re: How tough is the std 1200 auto?
BEN510 Posted on: 2008/10/15 13:01
my auto behind my a14 is a slug off the mark because of the cam,
i do give it heaps thou !

TOSSER i manualy shift it and it just holds gears until you change it ......

cant wait for me to get of my ass and put the manual in it thou !!!!!


#16 Re: How tough is the std 1200 auto?
Dodgeman Posted on: 2008/10/15 17:22
The Jatco 3N71B is a good 3 speed auto trans design, but there are a couple of things to know [at least about the ones behind A series engines.]

Selecting first will lock it in low. No upshift, no way.
Selecting second will lock it in second gear. that's it, second gear.
Selecting third [Drive] allows normal function.

The normal shift point is controlled by the govornor in the back of the trans [speed related] & the vacuum modulator valve. This means that in unmodified form the trans needs to see manifold vacuum to know how much load the engine is seeing.
High vacuum, = light throttle & low load, so earlier upshift.
Low vacuum = heavy throttle & high load, so late upshift.

A turbo pumps pressure into the manifold, so a suck through design will provide a vacuum signal between the carb & turbo, but a blow through design may be a problem.


#17 Re: How tough is the std 1200 auto?
revhead001 Posted on: 2008/10/15 21:10
Quote:

TOSSER wrote:
Hey Revhead, is that TCE in Geelong???


I think that they are in Dandenong.


#18 Re: How tough is the std 1200 auto?
DattoFrog Posted on: 2008/10/15 23:05
I have a good Jatco 3N71B complete with all the bits, Oh minus rear crosmember, for sale. If you are interested


#19 Re: How tough is the std 1200 auto?
olboy Posted on: 2008/10/16 11:10
This is how it goes. You take of reving it out in 1st then move the lever to 2nd, the box changes straight up to 2nd and you pull the lever straight back to 1st, the box won't change back to 1st untill you lock the back wheels with the hand/foot brake at the next corner, then you power away in 1st again. I guess it works a bit like a preslector box. The auto sucks alot of power though I would't think it would be much good in a road car. It works well on the dirt, dosn't wast time spinning wheels just grips and goes without wheelspin.
olboy


#20 Re: How tough is the std 1200 auto?
steveo Posted on: 2008/10/17 4:16
I was just reading WIKI about the auto transmission, and just wondering if the 4-speed automatics came out in Austrailia, and if so in what vehicle? sunny(310)? or 120y?
It states that the 4-speed autos came out in th 80's so i'm assuming it more than likley to be the sunny, if at all it was available.



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