C2S versus C4S

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10-09-2006, 07:36 AM

#46

Bill Verburg

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Quote:

Originally Posted by H20NOO

Big reds weigh quite a bit more than the standard brakes. I've had both on my 993 and for daily driving, you'll appreciate the performance advantage of the lighter brakes more than you'll ever appreciate the fade resistance of big reds.

MC

There is a long list that would disagree w/ you there.

Lets start w/
Porsche factory on 993RS, 993Cup, and 993tt
we will leave the middle out and end w/ me.

For every day driving, no they are not worth it, if you can feel the difference you are one ultra sensitive individual.

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10-09-2006, 08:03 AM

#47

Bill Verburg

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Quote:

Originally Posted by autobonrun

I can tell my C4S is quick out of the hole with the RS gear package, but I've lost my top end advantage since my 5th gear is is now 6th.

That's because you don't have RS gears
here is a simplified comparison of some of the gearing options.

Attached Images

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10-09-2006, 08:04 AM

#48

Bill Verburg

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Quote:

Originally Posted by Mark Wilson

And Big Reds won't stop you faster when the minivan cuts you off - that's just silly.

Wanna bet?

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10-09-2006, 08:09 AM

#49

Bill Verburg

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Quote:

Originally Posted by geolab

The mechanical brake system is not the same with the turbo starting with the reservoir.

The 993tt and 993C4S have exactly the same mechanical components, electro-hydraulicly boosted 25.4mm m/c, 322x32 and 322x28mm rotors, 36/44 Big Red front calipers, 28/28 rear calipers.

more info here

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10-09-2006, 09:49 AM

#50

Freddy

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Hi Bill,

I believe the gears are different on the 993 throughout the production years in order to meet some noise limits on the streets... Would you know what are these differences? I guess 97 and 98 models received longer gears than 95 or 96 cars...

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10-09-2006, 12:11 PM

#51

993RS

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All US and Swiss models had the G50/20 gearbox. ROW had G50/21 initially, then towards the end, the G50/20 as well.

Gear..US/Swiss......Rest of the World ......
______(G50/20)________(G50/21)__________
1.......3.818..................3.818...................
2.......2.048..................2.150....................
3.......1.407..................1.560....................
4.......1.118..................1.242....................
5....... 0.962.................1.027....................
6........0.775.................0.820....................

Final ratio 3.44:1

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10-09-2006, 12:58 PM

#52

Freddy

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Is there a way to be sure what type of gearbox do I have? If G50/20 or G50/21?

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10-09-2006, 02:14 PM

#53

993RS

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Look in your owner's manual for the gear ratios.

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10-10-2006, 02:21 AM

#54

geolab

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Quote:

Originally Posted by Bill Verburg

Hi Bill, just for precision on what was said,

Quote:

Originally Posted by geolab

Porsche C4S has the Turbo's brake calipers and discs because of weight and inertia in All wheels. The mechanical brake system is not the same with the turbo starting with the reservoir.

some facts on this.
C4S Brake fluid reservoir 964 355 013 50
Turbo reservoir 964 355 013 25

C4S HYDRAULIC UNIT 993 355 955 50
Turbo Hydraulic unit 993 355 955 00

C4S brake pressure regulator 964 355 305 00
Turbo 964 355 305 10

C4S electronic Brake control UNIT 993 618 127 00
Turbo control unit 993 618 125 00

etc. etc.

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10-10-2006, 08:43 AM

#55

Bill Verburg

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Quote:

some facts on this.
C4S Brake fluid reservoir 964 355 013 50
Turbo reservoir 964 355 013 25

The reservoirs have no material effect on brake function or performance

Quote:

C4S HYDRAULIC UNIT 993 355 955 50
Turbo Hydraulic unit 993 355 955 00

ABS hydraulic unit
993 355 955 00 is used on 2WD, non ABD cars
993 355 955 50 is used on M224(ABD) and M339(AWD) cars

pump
993 355 953 00 and 01 are used on narrow body AWD and RS
993 355 953 50 is used on M491(turbo look) and turbo

Quote:

C4S brake pressure regulator 964 355 305 00
Turbo 964 355 305 10

Yes, the pressure regulators are different because of the weight distribution difference between n/a and turbo and turbo does not have abd
993 355 305 01 -1x is used on base cars
993 355 305 01 -2x are used on ABD, n/a cars
964 355 305 00 -2x are used on ABD and AWD including M491(turbo look)cars

964 355 305 10 -1x is used on turbos

Quote:

C4S electronic Brake control UNIT 993 618 127 00
Turbo control unit 993 618 125 00

993 618 125 00 and 01 n/a control unit
993 618 126 00 n/a w/ abd control unit
993 618 127 00 M224(abd), M339(AWD), RS control unit

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