Diff V Cwp And Relative Cost Why

[pug205rally 1]

Just trying to get my head around this one. Why does a 4.8 CWP for example cost roughly the same as a Quaiffe or diff. Can't believe they cost similar to make. Is is a materials thing. Just looked to buy one and was hugely surprised.

 

Searched around and asked a few mates but no one can elighten me. Am sure some one on the board will know

 

 

Cheers

Simon

[Miles 331 1 Cars]

Any gear sets have and always will cost alot of money due to the material used and wasted making them, Even a single piece gear inside the gearbox is around £100.00, And with Close Ratio gear sets costing from £2000.00 gears are not cheap

With the supply of the Crown wheel and Pinion (CWP) you get the Crown wheel which bolts onto the Diff Ass and the Pinion (Output Shaft) so it's a fair bit of work and with the 4.8 not that many made (Quanty reduces price) alongside the standard parts, but I bet a std CWP won;t be far off this price

[pug205rally 1]

Any gear sets have and always will cost alot of money due to the material used and wasted making them, Even a single piece gear inside the gearbox is around £100.00, And with Close Ratio gear sets costing from £2000.00 gears are not cheap

With the supply of the Crown wheel and Pinion (CWP) you get the Crown wheel which bolts onto the Diff Ass and the Pinion (Output Shaft) so it's a fair bit of work and with the 4.8 not that many made (Quanty reduces price) alongside the standard parts, but I bet a std CWP won;t be far off this price

Thanks for the reply - I suppose the question was more about relative cost as in my opinion it makes a diff look cheap by comparision especially with the extra engineering etc.

[Jonmurgie 2]

Can someone just explain why people use a 4.8CWP as it's something that I've not very informed on

[Sam 4]

Its the final drive so raising the number will effectively lower the top speed acheivable in each gear. I'm not sure why the 4.9 is so special I guess its because its a good swap into a certain box, not sure what the bonus is over a 1.9/mi16(~4.42cwp) setup.

[Miles 331 1 Cars]

4.8's are used by mainly the Rally boy's as top speed is not as much of a issue, I have one sitting in the garage ready to be used on something!!

This used too be found on old 305's and Horizan's I think but I've yet to find one

[888rmb 6]

Fitting a 4.8 CWP makes each gear shorter, and gives you less of drop in rpm for each gear change. Changing the CWP is like changing to a different chainwheel on the front of a mountain bike. The smallest chainwheel has a big difference compared to the largest wheel, even though the ratios at the back are still the same.

I would say a 4.8 CWP is too short for a road car, 1st gear would be over really quickly and the top speed would be lower compared to a 4.4 or 4.1 with the same 5th gear.

Would probably be good for a rally car though as it would give you a better chance of the right gear at slower speeds and you aren't likely be doing 100mph plus for long periods of time. I think the 205 Challenge have gone over to 4.8s for the 2006 season.

[Sandy 191]

Changing the FDR doesn't affect the rev drops, only changing the gear ratios can do that.

 

I don't know what the big secret is, but 4.54, 4.78, 4.9 and 5.06 FDR's can be bought from Peugeot for about £300+vat. Which I presume is what the ppl selling them are doing and marking them up?

[pug205rally 1]

Can someone just explain why people use a 4.8CWP as it's something that I've not very informed on

Its great for gravel rallying when top speed is not much of an issue but keeping the car in the correct power band is. Am looking for the right blend of power on tap and a good responsive set-up. Hence 4.8 and Gripper. It does not make a close ratio box but does in my limited opinion help stage times

 

Ideally I would get one set-up for gravel and a separate box for tarmac probably without the 4.8 and gripper but poss Quaife

[Sam 4]

Whats the advantage over 1.9/mi16 diff setup then? I'm not sure what all the fuss is about??

[888rmb 6]

1.9s and Mi16s have the same diff, but different Crown Wheel and Pinions (CWPs).

Quaiffe and Gripper are different type of aftermarket Limited Slip Differentials (LSDs). They can be fitted with a variety of different CWPs depending on the gearing you want for the car.

[Sandy 191]

I expect Sam meant Mi16 diff as in FDR (4.43), which is short enough for my mate's class winning 205 Mi on 15" slicks, with the 1.9 gears.

[SPGTi 2]

But remember in the 205 challenge they are not only changing the CWP / FD but also 3rd, 4th and 5th gears.

 

Challenge Gear Kit

The main aspects of performance advantage come from the final drive ratio of 4.75. This combined with a new 3rd and 4th cluster and additional 5th gear offers strength and reliability alongside appropriate matching of gears.

 

The components that make up the kit are based on Peugeot 106 3rd and 4th gears and special final drive. To build this kit you will require a BE3 205 box with good 1st and 2nd gears.

 

 

Price: £640.00 (Excluding: VAT at 17.5%)

 

 

Steve

Edited January 2, 2006 by SPGTi