question on differential - BMW Forum - BimmerWerkz.com
3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 01-05-2009, 07:12 PM
Neutral Member
 
fabcal's Avatar
 
Join Date: Jan 2009
Location: Port-au-Prince, Haiti
Posts: 66
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
fabcal is on a distinguished road
(Thread Starter)
question on differential

I have a question: I changed the differential in my 325, the one I put makes the car quicker now but I don't have top speed anymore, I can only reach 210 km/h. My question is, is there a chip for my transmission that can change the ratio without having to open the transmission itself. I have a manual transmission by the way.
fabcal is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 01-06-2009, 03:26 AM
4th Gear Member
 
bimmerguy82's Avatar
 
Join Date: Mar 2005
Location: City of Rain, PNW
Posts: 884
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
bimmerguy82 has a reputation beyond repute bimmerguy82 has a reputation beyond repute bimmerguy82 has a reputation beyond repute bimmerguy82 has a reputation beyond repute bimmerguy82 has a reputation beyond repute bimmerguy82 has a reputation beyond repute bimmerguy82 has a reputation beyond repute bimmerguy82 has a reputation beyond repute bimmerguy82 has a reputation beyond repute bimmerguy82 has a reputation beyond repute bimmerguy82 has a reputation beyond repute
Send a message via MSN to bimmerguy82
Quote:
Originally Posted by fabcal View Post
I have a question: I changed the differential in my 325, the one I put makes the car quicker now but I don't have top speed anymore, I can only reach 210 km/h. My question is, is there a chip for my transmission that can change the ratio without having to open the transmission itself. I have a manual transmission by the way.
nope. you changed the final gear ratio which will lower your top speed. What diff did you put in? the only way to get your top speed back is to change to a less aggressive ratio.

BMWcrazy
___________
-Joshua



|AA stage 1 software| UUC light flywheel and clutch| UUC EVO 3 ssk | K&N Intake | Ebay Headers |

BMWCCA member#407674

Founding member of the hit 145 mph in my almost stock 325i BMW club.
bimmerguy82 is offline  
#3 (permalink) Old 01-06-2009, 05:22 PM
n00b
 
Join Date: Nov 2008
Posts: 23
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
318ise36318is is on a distinguished road
i bet u put a 318is diff on aint you! gives u hell of a lot on pull off but nuffin top end! that diff will just snap on you! get it off put ur 325i back on ASAP
318ise36318is is offline  
#4 (permalink) Old 01-07-2009, 08:05 PM
Neutral Member
 
fabcal's Avatar
 
Join Date: Jan 2009
Location: Port-au-Prince, Haiti
Posts: 66
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
fabcal is on a distinguished road
(Thread Starter)
aight, thanks a lot for the advice
fabcal is offline  
#5 (permalink) Old 01-07-2009, 09:28 PM
Pandemonium Director
 
nukeduster's Avatar
 
Join Date: Mar 2005
Location: Scottsdale, Arizona
Posts: 2,372
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute
Send a message via AIM to nukeduster Send a message via MSN to nukeduster
Quote:
Originally Posted by 318ise36318is View Post
i bet u put a 318is diff on aint you! gives u hell of a lot on pull off but nuffin top end! that diff will just snap on you! get it off put ur 325i back on ASAP
the e36 diffs regardless to gearing are all rated at the same torque handling. the main differences are the input drive flange bolt arrangements and if its LSD or not.

youre just hurting your fuel economy by having a numerically higher rear end. You'd need to be in the neighborhood of 500+ft/lbs of torque before you need to start worrying about killing an e36 diff.

nukeduster is offline  
#6 (permalink) Old 01-07-2009, 09:36 PM
my car is red
 
94BMW325i's Avatar
 
Join Date: Dec 2004
Location: Newark, Delaware
Posts: 5,747
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
94BMW325i has much to be proud of 94BMW325i has much to be proud of 94BMW325i has much to be proud of 94BMW325i has much to be proud of 94BMW325i has much to be proud of 94BMW325i has much to be proud of 94BMW325i has much to be proud of 94BMW325i has much to be proud of 94BMW325i has much to be proud of 94BMW325i has much to be proud of
Send a message via AIM to 94BMW325i Send a message via Yahoo to 94BMW325i
did you put in a 3.91 from an automatic 325 or something? Wondering what diff you put in your car.



member and partial creator of pimpin the auto club
94BMW325i is offline  
#7 (permalink) Old 01-08-2009, 03:38 AM
n00b
 
Join Date: Jan 2009
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
webeclassics is on a distinguished road
sound like the diff you put in was out of an automatic. 4:10 vs 3:73 There is nothing you can to regain your top speed short of changing the diff again.
I have a diff with 3:73's do you want to some trading?
Dave
webeclassics is offline  
#8 (permalink) Old 01-08-2009, 08:35 AM
Neutral Member
 
fabcal's Avatar
 
Join Date: Jan 2009
Location: Port-au-Prince, Haiti
Posts: 66
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
fabcal is on a distinguished road
(Thread Starter)
the one I put is a 3:40 from a 95 M3, I guess I should've also changed the transmission.
fabcal is offline  
#9 (permalink) Old 01-08-2009, 10:07 AM
Pandemonium Director
 
nukeduster's Avatar
 
Join Date: Mar 2005
Location: Scottsdale, Arizona
Posts: 2,372
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute
Send a message via AIM to nukeduster Send a message via MSN to nukeduster
The 95 m3 has a 3.15. The 95 automatic was a 3.23. They probably just told you that it was off an M car to sell you the part. Check the diff, there should be a tag on it (usually hanging off the drain plug if it didnt break off) with something like "3.73" or "S4.10" etc..

Changing the transmission at the same time isnt a magical fix to make your car faster. You did the correct thing, You went with a numerically higher rear end to get more speed out of the power you had available to you. BTW, when do you ever have a need to go faster then 210kph(130mph) anyway? The top speed limiter on your car is set from the factory to limit your car to 230kph.. even with a different diff you're not going to go much faster than your current 210.

nukeduster is offline  
#10 (permalink) Old 01-08-2009, 10:21 AM
Neutral Member
 
fabcal's Avatar
 
Join Date: Jan 2009
Location: Port-au-Prince, Haiti
Posts: 66
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
fabcal is on a distinguished road
(Thread Starter)
Ok, thanks Nukeduster, but what I mean is that I red line on 5th gear at 210 and I feel like the car can take much more, don't forget I have a complete exhaust system from Dinan, a cold air intake and a performance chip also from Dinan.
fabcal is offline  
#11 (permalink) Old 01-09-2009, 10:28 PM
Pandemonium Director
 
nukeduster's Avatar
 
Join Date: Mar 2005
Location: Scottsdale, Arizona
Posts: 2,372
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute nukeduster has a reputation beyond repute
Send a message via AIM to nukeduster Send a message via MSN to nukeduster
If you want higher top speed get a numerically lower diff. You can get as low as 2.79 rear ends for e36's without going custom. This WILL kill your acceleration, and I'd only recommend something that low if you are forced induction of some sort. A 3.15 is about as low as I'd go with any naturally aspirated e36, it'll top out at roughly 160-167mph(270kph) depending on which transmission (zf or getrag) your car has and if it has sufficient top end power.

With my stock ZF S5D 310Z transmission in my 95 m3 with a chip i've hit an indicated 165mph with the stock 3.15 rear end.

A 3.46 is a good combo to get if you can find one, it accelerates a noticeable amount quicker than stock but will still top out at around 130-140mph(225kph) at redline.

YMMV.

nukeduster is offline  
#12 (permalink) Old 01-18-2009, 07:37 AM
Neutral Member
 
garbone's Avatar
 
Join Date: Nov 2008
Location: Texas
Posts: 68
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
garbone is on a distinguished road
Send a message via Yahoo to garbone
Quote:
Originally Posted by nukeduster View Post
If you want higher top speed get a numerically lower diff. You can get as low as 2.79 rear ends for e36's without going custom. This WILL kill your acceleration, and I'd only recommend something that low if you are forced induction of some sort. A 3.15 is about as low as I'd go with any naturally aspirated e36, it'll top out at roughly 160-167mph(270kph) depending on which transmission (zf or getrag) your car has and if it has sufficient top end power.

With my stock ZF S5D 310Z transmission in my 95 m3 with a chip i've hit an indicated 165mph with the stock 3.15 rear end.

A 3.46 is a good combo to get if you can find one, it accelerates a noticeable amount quicker than stock but will still top out at around 130-140mph(225kph) at redline.

YMMV.
x2
garbone is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 3-Series (E36)


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
Shudogg i need you "Differential Question" nobrakese36 3-Series (E36) 3 01-27-2006 03:07 PM
Differential Question nobrakese36 3-Series (E36) 2 12-21-2005 09:28 PM
Differential... Ljk619 3-Series (E36) 1 10-09-2005 06:09 PM
Differential Question... jrhaile 3-Series (E36) 7 05-31-2004 08:22 PM
differential viali8 3-Series (E21, E30) 0 04-24-2004 06:56 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome