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thats a good question (more) (archive)

[ Follow Ups ] [ 5-series (E39) Message Board ] [ Msg. Board FAQ ]

Posted by JZ on July 06, 2000 at 11:31:18:

In Reply to: JZ:Do you have the part #?Maybe I got the wrong 1 posted by NW on July 06, 2000 at 10:29:42:

: : : Well....I have yet to really G-tech the car (waiting for same temp as previous runs) the seat of my pants, the 3.15 doesn't seem to make the car a whole lot quicker off the line????

: : : I know that Jimmy has taken off 0.5 seconds from 0-60 but it sure doesn't feel like it to me. Granted, the car is objectively running at higher RPMs throughout
: : : (about 400 rpm).

: : : Amyways...will post G-tech results before and after 3.15.

: : : I am seriously contemplatng putting in the 3.46 from the 528iA - that should really make a difference. Thoughts? My car is a 540iA.

: : after spending 12K on aftermarket mods from ACS and Dinan (my car is on Jimmy's site)I was very impressed with the overall improvments. The car handles, is fast, and is a real eye turner (in fact it is a daily occurance to come out to my carand find post-it notes, and bus. cards with comments and invitations for racing. The overall best bang for the buck is the 3.15 diff. I noticed a huge difference from the moment it was installed. I can definitly say from my experience and others that this is the only real mod that needs to be done for the frugal. You WILL SEE A DIFFERENCE. NW i suggest you pay a lot more attention to your car, or maybe you got shafted by your garage, but if you got the diff believe me you would notice it. As far as the SC from Dinan is concerened, a week is not happening. I was told 6 months from now if we are lucky. Also a sport clutch will be needed (another 2K), and a warranty goes without saying. I hope I'm wrong so I can really drive my beast before it goes into hibernation for the winter.
: : Best regards,
: : JZ

I reported on the diff about 3 months ago. I actually found out about it through Galo. I had my Dinan shop purchase the 3.15 and install it. I have to tell you that there is a huge mess involving the price, and specs for this part. PacificBMW who I use all the time was selling the diff without the core for 450. Don't hold me to it, but I beleive that itt was around that price. I paid 550 with labor and the core charge. As soon as i got the car back, my installer (who I trust very much and has never steered me in the wrong direction) told me that BMW had really messed up. That shops were selling the 3.15 diff for the wrong price. It should cost around 1600 bucks. I assume that since BMW al of sudden started getting orders for the part that it casued them to look at the price. Thats when they figured out that it was being sold for the warranty price. NOw if you were lucky enough to pay the lower price then you should be happy. I have noticed posts about the price increase, and the typical posts about Dinan charging too much. All I can say is that Dinan is charging the real price and that unlessa shop has a diff in stock and has not been notified by BMW you will pay the higher amount. To get the part number I would call Louie at Pacific BMW 800-909-part. He should confirm my findings, and be able to provide you with the part numbers.
As for your lack of performance with the new diff I have a couple ideas. One, it is possible that your car already had the 3.15. I think only the wagons 97-00 have the 3.15, but I have also heard that some auto's depending on year might have the 3.15 as well. My 00' 540 had the 2.96.Secondly, it is possible although highly un likely that your shop screwed you over (again highly unlikley) There is a 3.46 avaiable, but I would only recommend it for racing. I think if you had the diff installed you would see just how much the car has changed. Others, like Jimmy, Galo, Scott have done the mod and also find a tremondous difference in of the line acceleration. I hope this helps, but if it doesn't let me know and I'll see what I can find out. PS. let me know where you live and maybe I can help you out with a test spin.

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