great info guys! Will the Scoobysport active diff fit older cars, say, a '97 STi V3 Type-R by any chance?

 

Hi matt.

It will indeed.

 

is it still not ready..... come on first customer cash waiting (it will be under a fiver won't it Simon )

 

Simon, this might be an odd question, but is there any need for a driving course with it? I mean, it will be doing some pretty damn important stuff. What do you intend to offer in terms of warranty and so on?

ta,
Matt

 

yeah me too, I wanna test out a set too...

 

Simon,

How would I go about fitting this kit to my RB5 and what parts are needed? I've been half tempted to sell my RB5 and buy a Type R /RA, but I like my RB5 sooooo much.

I have 2 mates with typr R gearbox hanging around, so would I need to aquire one of these, or can it be fitted to my RB5 gearbox?

Thanks Phill

 

phill,

you dont need a different gearbox,

what you need is a transfer case containing a dccd centre diff and 1:1 drop gears. Your RB5 has a 3.54 rear final drive ratio.

The easiest way for this system to work on your car is to buy a P1 plated rear diff (makes the centre diff more effective at altering the handling) and you will also need a 3.9 crown wheel and pinion to fit an R160 rear diff, this is because due to the drop gears with the dccd transfer case being 1:1 your front and rear final drive ratios will now be mismatched will which blow up your centre diff in no time. Fitting the 3.9 crown wheel and pinion to your rear diff makes them the same again. These are only available in sport models, so get ringing round breakers yard if you intend to go this way.

You don't have to get a P1 plated rear diff, but it makes the adjustability of the centre lock up all the more effective.

 

Andy,
It would be nice to see exactly what the A-DCCD gets up to (just to see the change of the lights on the dash ) but i fear it would possably scare drivers as it does something like 40 calculations per second and if it adjusts anywhere near 10 per second, that would be scary too
I think the only way to even get close to what the A-DCCD does is get the car on a track, run the corners then "try" to simulate it the next time round (i fear lots of trial and error here )

Tony

 

Adam, according to Moray, the P1 doesnt use a plated rear diff.

Is that an American or British Trillion Simon?

 

LOL
good point John

trillion in my posts = 1,000,000,000

I think that's a European trillion right???

 

PS. Apologies for webby post rather than ScoobySport.. don't have time to change right now!

 

Thats a milliard you muppet, or in the USA a Billion.

Number of zeros U.S. & scientific community Other countries
3 thousand thousand
6 million million
9 billion 1000 million (1 milliard)
12 trillion billion
15 quadrillion 1000 billion
18 quintillion trillion
21 sextillion 1000 trillion
24 septillion quadrillion
27 octillion 1000 quadrillion
30 nonillion quintillion
33 decillion 1000 quintillion
36 undecillion sextillion
39 duodecillion 1000 sextillion
42 tredecillion septillion
45 quattuordecillion 1000 septillion
48 quindecillion octillion
51 sexdecillion 1000 octillion
54 septendecillion nonillion
57 octodecillion 1000 nonillion
60 novemdecillion decillion
63 vigintillion 1000 decillion
66 - 120 undecillion - vigintillion
303 centillion
600 centillion

Bloody Yanks.

 

beg your perdon, I really was being an even bigger muppet than you suggest..

by trillion I ACTUALLY meant 1,000,000,000,000

which it appears is called a "trillion billion"??

God knows.. I've lost myself now..

but anyway.. there are over 145,000,000,000,000 combinations!!!

 

No simon, they are two columns, one is the USA version, one is the rest of the world. What you have is 145 billion (UK speak) or 145 trillion (USA Speak) combos.

Thats a bit crap, surely you could squeeze a few more in there.

 

Well I didn't know that!! Genuinely I always thought a UK billion was a thousand million! Thank god I don't need to count that high when it comes to my bank balance!

Right..

just for you, we've spent the whole day on it and there are 145,000,000,000,004 combinations..
happy now?

 

I hope you've tested them all individually, I couldn't possibly fit a product to my car that hasn't been properly checked under all conditions...

 

LOL

If you really want us to we can.. but it might put the launch date back, as by my calculations it will take around 45,979 years of constant 24 hours a day testing

 

spread the load simon, we're more than happy to help with the testing

 

In that case...

If every registered member of scoobynet devotes their life to testing it 24 hours a day, we should have this thing nailed in just over a year!

 

LOL

Those 4 could be critical points on the map, good job i mentioned it.

 

I have a question.

When the DCCD is not free, does it actually perform as an LSD?

What I mean is does the torque split actually vary in a fixed setting depending on traction?

Obviously, the extra friction on the centre diff that is needed to alter the torque will have a similar effect, but if the traction losses overcome this will the diff lock further to prevent the torque being sent to the spinning wheels?

The reason I ask is that, in the wet, even on the first green, the traction and stability gains are noticeable. It certainly feels like its operating like an LSD rather than a free diff with a slightly higher front bias, but I'm not confident enough in my mechanical understandings to pronounce this as the gospel truth I guess I could work it out for myself, but the chances of proving it one way or the other on the way to the hedge is a risky strategy.

In johnfelsteads translation it suggests that the torque split varies, but this doesn't necessarily mean its acting like an LSD (it could just mean that it will send more torque to the rear if the rear spins as an open diff will),but if it does how does the diff work?

Apologies if I'm being stupid/ missing something obvious, and feel free to point out my retardedness if I am

 

yes, the DCCD works as a variable rate plated LSD, as you wind the dial forward the clamping force on the plates in the LSD increases.

 

Thanks John.

 

This may seem counter intuitive.. But a standard open diff will split the torque 50/50 regardless of conditions.. The DCCD centre diff has a torque split of approx 66/34 rear/front, so in it's open mode (if you assume it is perfectly open) the torque will always be split to that percentage, even if a wheel spins.

If however you lock the diff (and you assume it is firmly 100% locked), the torque will be split front/rear to the split of resistance front and rear... eg : if the rears are on ice and the fronts on sticky tarmac, the fronts will receive almost 100% of the torque, and the rears almost zero.

The magic with the DCCD is that when you partially close it, you both reduce the relative torque difference in the centre diff, and also increase the amount the torque split CAN change depending on the conditions. This is part of the complexity of 145,000,000,005 combinations - john, we've added one more for you

Cheers

Simon

 

pleasure. Thanks Simon, i feel honored.

It may help to look at the design of the diff unit, you can see how there are two systems in play, one is the plated LSD, the other is the 2:1 torque split generating input/output gears. When the clamping force increases this efectively moves the leverage point of the f/r output flanges that drive the front/rear diffs via the ouput shafts, so as you increase the locking ability of the diff, at the same time you are altering torque split. It's a very clever compact system.

 

Brilliant stuff guys.

This greatly helps me understand what I am feeling from the car but couldn't explain mechanically.

 

No problem with active control unit. Here in Czech republic is a man who produce active control differential units for about 700 Euro. These units are used in world rally championship in group N - production cars (Nial MC Shea - use this unit).
You have pressure, rpms maps with leftfoot an handbrake override. You have also 2 additional inputs for (gsenzor, brake pressure etc. .....)
Im not very familiar with developing the maps, i have only difflock under braking and difflock with gas pedal more than 50%. In the dry tarmac i use first position, on the wet 3-4 position. Gravel and snow - full lock.

 

**Edited due to commercial content**

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Tried all the settings and I'm still a crap driver, can I get that sorted under warranty?

 

No and your car is wasted on you The colour suits u thou

Just give me a go & I will show u how (not) to do it