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Post by felixy69 on Jun 2, 2016 17:00:01 GMT
Hi
I have been doing some resesrch in my mini auto trans
And in japan, the guys that are serious into racing their auto transmission normally plugs in a oil or air pressure guage to the transmission and have it display in the cock pit
I cant read japanese so i dont know or cannot ask why
Does anyone know what this guage tells and why it is nessesary to know ??
Thank you
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Post by limby2000 on Jun 3, 2016 16:14:04 GMT
Hi Felix, the gauge I think your refering to is an oil pressure gauge that they have plumbed into the pressure test outlet next to the oil filter canister. It reads the working oil pressure in the gearbox, which will be different for all gears and much higher for reverse. You will need a gauge that can read over 150 psi. Would like see some of these auto mini club racers. Is there a website in japan?.
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Post by richard1 on Jun 5, 2016 20:02:06 GMT
I guess it would be interesting to know what they use it for. I just used it to test my pump to identify the problem. Here is reverse.  and forward  For everyday driving a regular gauge seems sufficient, showing me about 60 psi until it heats up, they pretty steady at about 42 psi. I did that with a T at the pressure light sensor  |
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Post by limby2000 on Jun 5, 2016 20:52:26 GMT
Its a good feeling to know your gearbox pressure is up high, I did look into getting a gauge, but all the one,s I could find were of an industrial type.
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Post by mra-minis on Jul 26, 2016 9:34:39 GMT
I can be contacted on martin@kmprecisionengineering.com
200psi gauges are the ones to go for, 168psi is normal for reverse, but you can up the pressure to increase the clamping forces on the clutches and bands, but too much will result in damage, it is a fine balance, if you find the power output is able to slip the clutches then the first "port of call" is to raise the friction coefficient of the materials, then if all else fails raise the pressure, which will result in less slippage, but will wear parts sooner.
I didn't do it on a turbo engine with a 120bhp, but there are higher powered engines running AP2's, simply increasing the frictional coefficients was good enough although very costly they did work well.
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