Quote:
Originally Posted by dishy
Hi Padders, where have you found this info from please mate? From the very limited google research I have done, the gen 2 gearbox is still an 8HP45 and I also though the gear ratios remained the same.
Regarding the certain models, I would think that it was more by chance but had this criteria:
- since gen 2 box released mid 2014, only cars manufactured after this date could possibly have them
- BMW stock of gen1 boxes would need to have run out before BMW would have ordered more 8HP gearboxes, which would have been gen2
So, I think that it may have been a little while after the gen2 release date, however my car was actually manufactured in late 2014 but I'm sure it has the gen2 box as engine shutdown is instant and sometimes before the car has fully come to a complete settled stop. I think the A.S.S should wait 0.5s tbh.
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Hi
I formed the opinion I posted above via research at
http://www.realoem.com,
http://www.automobile-catalog.com/ and also
http://www.zf.com
Real OEM shows that some models are currently fitted with the second gen '50' box as per the 5 series update of mid 2014 and other models still have the earlier '45' box. The second link above lists gear ratios for each model and this data supports realoem since it can be shown that the models with the 50 box have the taller top gear and the 7.8:1 spread. The other models with the '45' box such as the 120i and M135i have the earlier 7.07:1 ratio spread. I am not claiming it is gospel but I would be surprised if I am wrong.
On the press release for the second gen 8HP50 box ZF specifically state that the ratio spread has been widened to 7.8:1 so it seems to me that if a box has the narrower 7:1 spread then its a gen 1 8HP45
See:
http://www.zf.com/corporate/en_de/pr...sp?newsId=3885
What I can't be sure of is if there is a second gen '45' box around but I doubt is as the '45' now being fitted has the earlier gen 1 ratio spread so is presumably a gen 1 box. In addition the wiki page for the zf8hp lists the 45 as gen 1 and the 50 as gen 2 but this hasn't been updated for a while so would only consider it at best circumstantial evidence!
In summary, it seems to me that if you have a B gen engine you get the GA8HP50, if you have a N engine you get the 45. This of course may change at any point or indeed may have changed already. Make of that what you will!
ps I am talking about Euro spec cars, I have no idea if the Antipodean cars are similar or not!