Synchrorev match transmission reliability?

Rahul718

So the SRM is a separate unit from the actual transmission? Just trying to understand it better

SouthArk370Z

All SRM does is blip the throttle a little. IIRC, the TCM and ECM compare engine speed and trans input speed and tries to match them. FSM (and possibly the OM) will have details on how it works. As has been said, if anything, it will increase the life of the transmission and you can always turn it off if you think it is a problem.

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ayrton88

I didn't have an M3, but I had two 3 series BMWs and they were the most unreliable cars I owned. They reminded me of the domestic cars of the '70s and '80s but way more expensive to fix. Way back, I said no thanks to American cars and went Japanese and found the difference incredible. I always owned Japanese cars for many years, but always wanted a BMW. Expensive lesson learned, now I'm back with the Z and, knock wood, the reliability has been excellent. Don't get me wrong, the Bimmers were great driving cars, they just couldn't stay away from the dealership.

jdsto

i'm no expert but to my way of thinking by correctly matching the revs of the engine and transmission shouldn't it reduce wear and tear on the transmission?

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SouthArk370Z

That seems to be the general consensus but I don't think anybody has any empirical data to back it up.

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Rahul718

I just want to clarify something.

I know the idea of SRM is good for the transmission but I was talking about the SRM actual unit - since that's an electronic or computer operated, is it more likely to fail? It seems no, but that's what I was asking.

SouthArk370Z

Other than the sensors (should last a lifetime), there is nothing added to the "plain" system. The throttle servo is already there. The ECM and TCM are already there. The code in the ECM/TCM is not going to fail (assuming it was tested properly).

So, to sum it up, the sensors technically decrease reliability (added parts to fail) but only on paper. Ie, not enough to even consider.

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4TthAnnyZ

No more likely than any other computer on any other car, because it is just that... a computer.

nis350

yes it does. Not only reduce the wear and tear on the clutch and transmission, it also reduce the stress on the rest of the driven train and suspension. Just imagine someone drops down one gear or two at high rpm without any throttle, that engine braking (jerk) puts stress on the whole driven train and suspension.