M5 SMG on E46 M3?

[x Spades x]

Hey Fellas,

I may have heard this in passing, but do people put the E60 M5 SMG pump into our cars? If so, whats the benefit? Any coding involved, etc?

Kareem

[sbay]

Crazy enough, my last E46 M3 had an E60 M5 SMG pump. Got it tested and it pressurized fine and shifted normally. I was never 100% about it though because I just like things original but didn’t care enough to spend money to change it. Friend of mine said it’ll be more durable because it’s coming from a more powerful car but I have no data to back that up.

[Shonky]

Friend of mine said it’ll be more durable because it’s coming from a more powerful car but I have no data to back that up.

Irrelevant really, all the pump does is pressurise the hydraulic system.

Maybe if that particular car would be changing gears significantly more often a pump might be designed for a higher duty cycle, but an E60 M5 is not going to be significantly different in that regard.

[0-60motorsports]

Crazy enough, my last E46 M3 had an E60 M5 SMG pump. Got it tested and it pressurized fine and shifted normally. I was never 100% about it though because I just like things original but didn’t care enough to spend money to change it. Friend of mine said it’ll be more durable because it’s coming from a more powerful car but I have no data to back that up.

Interesting. Any pics?

[oceansize]

An SMG unit is just some solenoids, electric motor, couple sensors, a reservoir, accumulator and a bunch of o-rings/seals. I guess it's possible BMW "beefed" up something (larger accumulator?, you can already buy those from MLR) but I don't really see what could be significantly "better" particularly if it costs more. I took a look at some pics of an e60 m5 SMG unit, looks like the same stuff I listed but laid out differently.

[x Spades x]

Crazy enough, my last E46 M3 had an E60 M5 SMG pump. Got it tested and it pressurized fine and shifted normally. I was never 100% about it though because I just like things original but didn’t care enough to spend money to change it. Friend of mine said it’ll be more durable because it’s coming from a more powerful car but I have no data to back that up.

Did it shift any harder/faster?

[sbay]

Interesting. Any pics?

Here’s a picture of the unit out of the car. Pretty Frankenstein but it worked.

[sbay]

Did it shift any harder/faster?

Didn’t notice any difference, shifted normally. Nothing better or worse. Here’s a picture showing it pressurized ok. Don’t think there was any coding involved either. My mechanic would’ve mentioned if there was.

[Shonky]

Did it shift any harder/faster?

The pressure is regulated. So a bigger pump at best just pressurises faster. The stop pressure will be the same. The pump is not directly involved in changing gears. In fact when pressurised you'll get a number of gear changes without the pump running at all. So no it won't make a difference.