Torque question

[ALBundy]

It all depends on your current differential ratio. Most if not all the time our BMW will not be able to fully utilise the gearing ratio given.

I have replaced mine from 3.64 to 3.91 giving me close to a 8% increase in usable torque and yet there is no sacrifice in top speed. There is no other mod that gives you such bang for the buck. The idea is not to overdo it

 

[initialM]

It all depends on your current differential ratio. Most if not all the time our BMW will not be able to fully utilise the gearing ratio given.

I have replaced mine from 3.64 to 3.91 giving me close to a 8% increase in usable torque and yet there is no sacrifice in top speed. There is no other mod that gives you such bang for the buck. The idea is not to overdo it

Aiyah ///M car oso not enuff arr? Put Ms Saigon at passenger seat sure can boost the power.

 

[erica34]

followed what Al did on my e34 (3.64 to 3.91) and e46 (3.46 to 3.64). clear improvement in acceleration and driveability and good value compared to software and intake.

 

[ALBundy]

Use 3.91 on your e46 la, given that the 5th gear ratio is only .74, it won't significantly affect the car's rpm when cruising

 

[fabianyee]

first of all, which engine powering ur BMW?
Remapping if done properly will improve 'useable' torque curve...

 

[erica34]

on my 328ci definitely felt bigger improvement from diff mod compared to upsolute remap. figured 3.64 would be ok since that's what bmw put on us model zhp. initial plan was to get 3.73 or 3.91 used gearset from US but chanced upon 3.64 gearset here. susah man to find suitable used gearset. new from bmw is realllyyyy expensive. had a go with a most likely stock 330ci after mod and quite pleased... keke.

 

[Zoggee]

BMW engineers built cars for specific market.Tested and proven but still in doubt over the 50/50 weight distribution on RHD cars.Ever wonder when you pop the hood and notice the engine slanting to drivers side? Mana itu 50/50 weight distribution. oops...off topik pulak! Sorry.

Torque Wins Races ..Horsepower sells parts.

If to mod car for bragging rights ...whats the use banyak ada crash la? Power also useless if dunno how to drive. eh...off topic lagi...hehe.

You want a fast BMW car? Get a fast BMW car la....Go M//Sport. Thats plenty of torque! Which sadly I cannot afford. Tapi kalah jugak in Sepang in lap time attack.
weeeeeee......!

 

[ALBundy]

BMW engineers built cars for specific market.Tested and proven but still in doubt over the 50/50 weight distribution on RHD cars.Ever wonder when you pop the hood and notice the engine slanting to drivers side? Mana itu 50/50 weight distribution. oops...off topik

The 50/50 weight distribution is about the front and rear axle not left and right...duh!!

 

[fabianyee]

zoggee's crooked humour can't be taken too seriously...

Anyway, the 4 potters are closer to 50/50 weight distribution compared to the 6 pot siblings....

 

[B33mEr]

on my 328ci definitely felt bigger improvement from diff mod compared to upsolute remap. figured 3.64 would be ok since that's what bmw put on us model zhp. initial plan was to get 3.73 or 3.91 used gearset from US but chanced upon 3.64 gearset here. susah man to find suitable used gearset. new from bmw is realllyyyy expensive. had a go with a most likely stock 330ci after mod and quite pleased... keke.

US model ZHP diffs is 3.07 standard is 2.93

 

[B33mEr]

BMW engineers built cars for specific market.Tested and proven but still in doubt over the 50/50 weight distribution on RHD cars.Ever wonder when you pop the hood and notice the engine slanting to drivers side? Mana itu 50/50 weight distribution. oops...off topik pulak! Sorry.

Don't know whether you're joking or not but i actually agree with you ... It seem all e46 senget sebelah to the right side to compensate for the drivers weight since it's designed in mind for LHD :4:

 

[ALBundy]

zoggee's crooked humour can't be taken too seriously...

Well, not many find it funny. And yeah, I don't take what he says puke: )seriously as always :thefinger::wink:

 

[ALBundy]

Don't know whether you're joking or not but i actually agree with you ... It seem all e46 senget sebelah to the right side to compensate for the drivers weight since it's designed in mind for LHD :4:

Tun Beemer, there are more reasons as to why the engine is slanted. Firstly that allows designers to employ a lower hoodline and also a lower center of gravity (not much). Secondly it allows BMW engines to have bigger and longer intake manifolds which leads to better flow of air distribution to all cylinders. Just compared BMW's intake manifold versus the Japs. A better example would be the ///M engines with the massive intake manifold.

As to better weight distribution, I guess the effect is minimal given that the bulk of the engine's weight is located at the bottom (crank, pistons, conrod, engine block) and the slant is less than 30 degrees.

 

[B33mEr]

Tun Beemer, there are more reasons as to why the engine is slanted. Firstly that allows designers to employ a lower hoodline and also a lower center of gravity (not much). Secondly it allows BMW engines to have bigger and longer intake manifolds which leads to better flow of air distribution to all cylinders. Just compared BMW's intake manifold versus the Japs. A better example would be the ///M engines with the massive intake manifold.

As to better weight distribution, I guess the effect is minimal given that the bulk of the engine's weight is located at the bottom (crank, pistons, conrod, engine block) and the slant is less than 30 degrees.

Great info :top: and i agree on the point you mentioned above. But what i was referring to (in which i should have been more specific :4 actually are the suspension. Almost all E46 i've seen tend to be more slanted to the right i.e. senget because the way it was designed by BMW to take account the weight of the driver since it's LHD for most countries in Europe.

 

[ALBundy]

Yup the senget senget is to compensate for the driver's weight. Still the same for new models

 

[erica34]

US model ZHP diffs is 3.07 standard is 2.93

my car auto la... hence diff mod mentioned was 3.46 to 3.64

 

[B33mEr]

my car auto la... hence diff mod mentioned was 3.46 to 3.64

Whoops my bad :4: Yup autos have a higher diff ratios than a manual/SMG diff ... Mine is 2.93

 

[alantiong]

i agree with initialM.. no replacement for displacement.. and i think its the cheapest and reliable..

 

[initialM]

i agree with initialM.. no replacement for displacement.. and i think its the cheapest and reliable..

I'm based on my experience and learn from Sifu. Its mostly true for BMW. Unless Japanese car different story. 2.0 Evo can get stock 280hp.

 

[alantiong]

Unichip is the cheapest route for a piggyback. Standalone management systems would cost upwards of 5k usually. I think Unichip is somewhere around RM2k+ right now inclusive of dyno runs and tuning.

For some of you who still don't quite know what torque and horsepower is and how they equate to each other you can read this article. It pretty much explains everything.

http://www.carcraft.com/techarticles/horsepower_vs_torque/index.html

Changing the gear ratio does not increase torque at the engine and is pretty much a temporary solution. The ultimate goal would be to increase torque at the engine so that your HP increases as well therefore not sacrificing top end speed.

Thank you loafer!! at last some light!!

Guys, gear ratio DO NOT change the power of your Engine!

Torque and HP is a same derivation from the Newton Law. Anything below 5250RPM in your car is done by torque and hp only takes over after that. This is the holy grail of F=MA. Easiest way to prove this is look at any Dyno chart. HP will always intersect Torque (lb.ft) at 5250rpm.)

Understanding this law of physic, you will understand that changing gear ratio is only changing the range of acceleration within a certain speed range.

So, come back to basic, still so replacement for displacement!!