Need diff for manual coversion

[330itis 15]

Hi, I am doing a manual conversion in my 318IS which has and m44 motor and Im using the gear box and stuff out of an m43. I have just goten to the stage in the conversion where I need a lower ratio diff. The diff I have in it at the moment is a 4.44 ?? well the tag says 444 so thats my guess. And I drove the car yesterday and the gears are very close together and at 100Kmh the engine revs out to 3600-3700 rpm. so I definetly need a lower ratio diff.

What ratio diff do I need for this m44 motor? will a 3.65 do it? what comes standard on a manual m44?

looking for quick replys as it is quite urgent. sory

Thanks!

[Carl 3]

3.91 would be good

[Gus 5]

e30 stuff is 4.1, imagine you would be good with that too

[TronSpec 0]

yeah 4.1 would be the go with your 1.8 power. If you put too lower diff in then you will have sh*t acceleration

[drifty325i 0]

3.91 as well

[318isCoupe 0]

3.63 or you'll be revving your nuts off at 100k.

[Silver Fox 43]

4.1 gives me 100 k's at 3000 revs, 318i E30, reasonable acceleration as well.

[drifty325i 0]

So with Silver foxs car is revving around 3000rpm @100 on 15inch mags, i still think a 3.91 would be the best in your car. Maby a 4.1, depends if you in the city alot or open road driving. If your running oversized mags like 17s or 18s a 4.1 would be worth while imo

[kerrynzl 3]

An E30 with a 0.82 fifth and a 4.1 rear has a total of 3.36 overall ratio [2700 RPM @ 60MPH with a 25"diameter tyre][excuse imperial figures]

An E36 with a 1:1 fifth and a 3.63 would be revving at 2927RPM @ 60MPH with a 25" tyre

It all depends on what gearbox you are using

[kerrynzl 3]

the formula is:

[RPM x TYRE DIAMETER inches] divided by [OVERALL RATIO x 336] = MPH or

[MPH x 336 x OVERALL RATIO] divided by [TYRE DIAMETER inches]= RPM

[will 169]

the formula is:

[RPM x TYRE DIAMETER inches] divided by [OVERALL RATIO x 336] = MPH or

[MPH x 336 x OVERALL RATIO] divided by [TYRE DIAMETER inches]= RPM

Hey Kerry, we need to beat that yankee imperial sh*t out of you and bring you into the metric world..!!

I would think that I would try a 3.91 first, will give you better cruising but still allow you to get going with your M42 power???.. (bit strange to use M42 and power in the same sentence..!! )

If you want more boy-racer acceleration, use the 4.1.

my 2c worth..

Will

[330itis 15]

Thanks guys. Well I found out that the M44 manual originaly has a 3.3- 3.4 diff.

I just drove down to waitomo with the 4.44 diff and Its like Im missing 5th. Like it revs really high.

Im not so sure about the 4.1 diff. I dont think It will be enough. Its a 1.9L motor by the way.

but I think the 3.6 sounds good??

Driving down I cained the sh*t out of subaru legacys off the line. quite fun hehe

but thanks alot everyone!

[drifty325i 0]

3.91 as well

Again

[Carl 3]

Okay, so I have a good spreadsheet that's tits for calculations. Feed in your specs and slide the slider for a nice little graphical representation. I can't upload it due to restricitions so PM me for it.

[kerrynzl 3]

Okay, so I have a good spreadsheet that's tits for calculations. it.

Hey Mate,

When I use the words "Spread, Sheets, & Tits" in a sentence, It has a totally different meaning.Haha!

[BM WORLD 1264]

i have a 3.64 that came from a 318ti ,manual .

you would need to swap back cover over , or swap gears over . ti uses e30 type rear end .

021433600 .

$250