Thread: Sonnax
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Old 02-04-2013, 10:25 PM
storeboy storeboy is offline
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storeboy is on a distinguished road

This is one of those questions if you ask 50 people, 25 are going to love it and 25 are going to say it is useless. On the older 545rfe I think it worked better because the trans didn't have the same learning logic as the newer ones do.

I will say I have an 09 with the newer 545rfe and have the sonnax on and I think it made a difference. Sure the first few days were nice, but then the learning logic of the trans kicked in and adjusted the pressure back down. Even after all of this, my 2-3 shift is hands down better than it used to be. Before the Sonnax, it would have a long pause (like it was thinking where to go next) before it would shift. Now I have none of that and it shifts just like it should.
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