Launching with diff lock in?

[terrybullwon]

What happens if you launch with the diff lock in? We playing off road the off day in the land rover and i was learning to use the lower and high boxes and the air lockers which lock the diffs indepently

So the general question is what happens? Any videos?

Cheers James

[HPmuirt]

What happens if you launch with the diff lock in?

I have often asked this and received mixed replies...for example when I asked about it at the GTi last year, all the other S2's that ran didn't bother using it, so I didn't bother either and was actually very fast off the line (I dropped Gregs beast off the line, but then further down the track, his slight 150 horses advantage wasted me )

I have tried it at my local traffic light GP....a full bore launch in the dry with the diff lock engaged and I have to say that it worked nicely, but you have to wonder how long before you break something.

From my understanding of the mechanics in the rear diff, the locking pin is not that thick, so too many full bore launches might just shear the pin

I guess we need Audiman or someone who has had one apart to comment on how strong it might be.

Cheers n

Si

[Crawford_S2]

I would say its not really designed for this sort of thing and in the dry i can't see it being a massive advantage. Would love someone to prove otherwise though

[Dan_s2_coupe]

i used it to rip some grass up awhile ago only thing is it cuts out when u do over 10mph on the spot not much good when doin 40 lol

[aronmatic2]

i am allways using diff lock on drag race. launching on 5000-5500rpm.
one time, i forgat to lock, i broke the rear halfshaft.

[Greg_S]

that sounds like a good reason to use it to me

[Jeffer]

you broke the rear shafts???
How on earth did you do that? I never locked the diff or had problems with my drag launches whatsoever. And I did a lot of them. Last year I've been running the Torsen in the back.

[aronmatic2]

i never broke shaft with normal tires. maybe thats why.

i am using this:

[Jeffer]

shouldn't matter, I'm running Toyo's R888's

[aronmatic2]

ooooh. thats good tire too.
maybe need to teach my feet.
i have no more idea why i broke.

[area51-s2-belgium]

i am allways using diff lock on drag race. launching on 5000-5500rpm.
one time, i forgat to lock, i broke the rear halfshaft.

i never tried before to use the diff when launching

but i also broke the rear halfshaft last year



see other pics of it : http://www.verle.be/homokineet/index.htm

[Henka]

There is no locking pin - there is a big gear-type collar that locks the diff housing to the left side out-put shaft. So, in effect, all the power is transmitted via the spider gears - maybe not the most powerful way to transmit power to the ground. Sure, they will probably hold up just fine - I mean people have been doing the white n' blue mod for years. In the long run it's probably not the best of solutions.

Jeffer's Torsen is probably a better solution but it has the downside of heating oil (Torsens heat the oil alot!) and it's heavier - so it steals power. Still, one must say that the power lost is no biggie compared to the benefit of having LSD (not the drug mind you).

Look at all the Swedish 9s runing cars - Most, if not all, of them run just a locked stock rear axle - some even use a welded up center with no issues. Just yank that wire man!

Oh and - there is a reason that Porsche went with the bigger rear outers on the RS2 (found in the S2 Avant in 93) - the last way longer!!

[Anagonda]

In my car the big gear "diff lock" was broken when I bought the car. So it is possible to get it in parts. At this moment couldn't find the pictures of it.
The car had only 310hp at that point, but I don't know what the previous owner had done to it.

[prosty]

I've broken the rear diff without the diff lock engaged, and my friends always break their drive shafts when they don't use their diff locks. So I'm a PRO difflocker all the way. 2 wheels is better than one, simple math. ?

[YELL MAN]

Is there a greater transmission loss when using the diff lock for drag racing? Also i once broke my rear left C/V joint while doing a power takeoff but i was not using the diff lock it probably didnt help and i had passengers at the time.