Perfect diff ratioq

[phi1]

Hi all, I have a m60 6 speed and wondered what the best ratio is for track/drift/fast road driving. I currently have a 3.64 but it's way to low geared I was thinking a 3.15 or 2.97 but wondered what people had?

[glenn]

with my last v8, i had the m3 3.25:1 diff, and thought it was just a tad too low geared.
with the v10, i've fitted a 3.15:1
i think this will suit my requirements just right

[Driftben]

how comes you think its way too low geared phil?
what speed does 6th max out at?
im currently looking for a diff as we speak

[phi1]

it really is way to low geared, I can do about 120 flat out in 6th but I want more and cruising is quite high up in the revs I think I am going to go for the 3.15 ratio! 3.64 would be perfect for just drifting but other than that I wouldn't bother.

[Jonsku]

I've 3.41 in the cabrio, tops up at 285km/h with 6800rpm rev limit (tested at dyno), pulls nicely all over the rev-band though it's a bit short for highway cruising..

This with 245/35-17 tires.

[Barx325i]

if you're running a reduced/increased circumferance tire, this will/can alter road speed more than a ratio swap, however here's the tool of choice for ratio selection:

www.unixnerd.demon.co.uk/revs.html

[Driftben]

It says with my 17" wheel and a 3.15 diff with a 6 speed box I can pretty much reach up to 185mph
I'd take off into the sunset

[Phill172]

Mine tops out at 120-130 ish with a 5speed, no idea the ratio, reckon its a 3.7.... It's shite on the road, well 0-80 is super quick, drifting its perfect but on a long run its the worst thing in the world

[Driftben]

well im quite lucky i saw this because i was going to go for a diff ratio the same as yours because i wanted a fun drive but i also want to drive down to germany
what sort of exhaust have you gone for with your conversion phil just out of interest because im trying to tackle that at the minute

[phi1]

I had to make a complete custom exhaust, the manifolds were the hardest part! My exhaust is fairly loud as I have no cat's just two centre silencers and then a backbox but I am going to change the backbox to something that will make it a little better! I also am using an x pipe to increase backpresure.

[Driftben]

oh right, well iv just finished both sets of manifolds and now im looking into start the rest of the system.
could you possibly take a few pics of the system you've made phil?

[phi1]

I sure can, what suspension setup did you go for? I am trying to figure what springs I need for the front poundage wise!

[Driftben]

Well iv gone for Gaz gold coil overs all round with if I remember rightly 600lb springs on the front? May have to confirm that but it's around there

[200272]

I have a 2.79 it is great for road use, not tried it on a track yet.
My exhaust is really quite, you can happily talk at 70mph revs at 2k ish, until you hit 4k then it roars.
Here is a picture or two.



In the end i just used the 600mm back boxes as the guy at the exhaust shop said using all four will make it far to quiet.



I know its in an 02 but i still have to get round an E30 rear end

[SuperchargedV8Touring]

Hi 200272, What did you get your 2.79 lsd out of?

It would be a good one for me (although I've already got a 3.07 from an E28 M535i mounted in place).

Have you got a crossover/ balance box in the middle of your set-up? It looks like a nice tidy system, with a good compromise between noise and comfort!

[200272]

Hi i remember talking to you at Gaydon last year how is the touring?
I got the diff from ebay £250 what a bargain...

I have linked the two pipes up the front.

Cheers.

[SuperchargedV8Touring]

I was wondering if it was you, and it is!

£250 is good, mine cost me £300. Is yours out of a 5 series or a 3 series? How easy was it to fit?

I'm not 100% sure if I'm going to make it to Gaydon this year, as the Touring was not getting much attention lately from the guys working on it. Long story, but let's just say that as of this week things might be picking up progress-wise.

It needs the brakes plumbing in, the final Emerald wiring finishing, exhaust system tweaked, E36 rack fitting and water methanol kit installed. A lot in some ways, but not too bad in other ways!

Hopefully we'll meet again sometime, when mine is up and running.

All the best, Michael.

[vokietis]

have 2.79 3.07 3.25 open diffs medium case typ188 if anyone interested

[Driftben]

When running a M60/62 dude it will probably be best with a LSD. Unless your giving them away free

[vokietis]

When running a M60/62 dude it will probably be best with a LSD. Unless your giving them away free

WELD it,lsd will last you 10 minutes anyway unless u drive like a pussy BTW did u ever drive an e34 540 6 speed with no lsd from factory???

[Driftben]

I can't see that you will distroy a LSD in a hurry just with a standard M60/62 even if you drive the bastard like Colin McCray.
I haven't driven a standard 540 speed with no LSD though. But just remember the 540 is a bardge compared to a E30

[SuperchargedV8Touring]

WELD it,lsd will last you 10 minutes anyway unless u drive like a pussy BTW did u ever drive an e34 540 6 speed with no lsd from factory???[/quote]

I hope my lsd doesn't explode into shrapnel then!

[Driftben]

It might if you pop the boost upto 8000psi like off fast and furious

[SuperchargedV8Touring]

Yeah! I'd better stay off the nos as well then, or all the rivets on the floorpan will pop off and I'll change gear 18 times to compensate........

[Driftben]

Hahaha I was only talking about the Fast and furious flying floor pan just the other day. I was in stitches because the apprentice at work with his little fiesta couldn't understand why I thought it was so funny.

[SuperchargedV8Touring]

There aren't many films which do a good job of being realistic with engine/ exhaust/ tyre sounds! How many times do you see a car on grass or gravel making squealing tyre noises?!

Some of the much older films do it better, IMO, like Bullit, French Connection. Ronin has some good bits and Gone In Thirty Seconds is great at the start, where they steal the 911 from the showroom.

Mind you, I don't mind watching F&F, or the Transporter films!

[Driftben]

yea the good old movies do it best, unless you want amazing graphics of course

[SuperchargedV8Touring]

BTW, How's the rest of the exhaust coming along?