GT4 RS breaks cover then...

[rkwm1]

TDT said:

MR Performance Kit at Goodwood today.

How much is it?

[Twinfan]

rkwm1 said:

TDT said:

MR Performance Kit at Goodwood today.

How much is it?

Too much........

[rkwm1]

Twinfan said:

rkwm1 said:

TDT said:

MR Performance Kit at Goodwood today.

How much is it?

Too much........

Can i just get the carbon bits for the front wings?

[TDT]

Available in Europe in December.
Personally… if i was an owner… I’d possibly only do dampers.

But for the expected full kit price… a standard 992 GT3 is still more car and still a fair lick faster.

Balance is maintained in the Porsche hierarchy.

[TDT]

[isaldiri]

TDT said:

Personally… if i was an owner… I’d possibly only do dampers.

You're missing the point of the thing. The full kit costs a fortune due to the aero tat that makes it obvious it's a MR car. Dampers aren't easily visible and therefore aren't quite as interesting.....

[caymanRS23]

rkwm1 said:

Can i just get the carbon bits for the front wings?

You can get them now - dbcarbon sell them, and somewhat cheaper than what's been put forward

Kit in Germany is (ex VAT), and not including install:

35,718 EUR, not including brake pads
+
3,900 EUR for 'carbon aero', which is the louvres and the carbon strip on the rear boot (not spoiler)

In GBP you're probably looking at £45k all-in

For around 6s on a 'ring lap time...

The GT3 RS was around 10s, and kit is ~ £80k

[caymanRS23]

isaldiri said:

You're missing the point of the thing. The full kit costs a fortune due to the aero tat that makes it obvious it's a MR car. Dampers aren't easily visible and therefore aren't quite as interesting.....

Think most would be most interested in just suspension, which can be bought separately

In terms of downforce... in some numbers on t'interwebs from Porsche...

At 200km/h / 124mph, at the rear, with wings in 'performance mode'

4RS - 99kg
4RS MR - 169kg
3RS - 409kg

Not sure what the downforce difference 'feels like', but apparently it equates to a theoretical additional 4-5% lateral grip

[isaldiri]

caymanRS23 said:

In terms of downforce... in some numbers on t'interwebs from Porsche...

At 200km/h / 124mph, at the rear, with wings in 'performance mode'

4RS - 99kg
4RS MR - 169kg
3RS - 409kg

Not sure what the downforce difference 'feels like', but apparently it equates to a theoretical additional 4-5% lateral grip

70kg of extra downforce on a 1500kg (car+driver approx) would be that 4-5% added grip. That then translates to something like a 2-3% increase (square root of whatever that extra grip iirc) in theoretical maximum speed one could be taking a corner which...... may or may not be relevant I suppose.....

but I freely admit to being somewhat biased having said before quite a few times, downforce on a road car especially for most 'normal' drivers is not particularly relevant so take with relevant pinch of salt as required.

[rkwm1]

caymanRS23 said:

You can get them now - dbcarbon sell them, and somewhat cheaper than what's been put forward

Kit in Germany is (ex VAT), and not including install:

35,718 EUR, not including brake pads
+
3,900 EUR for 'carbon aero', which is the louvres and the carbon strip on the rear boot (not spoiler)

In GBP you're probably looking at £45k all-in

For around 6s on a 'ring lap time...

The GT3 RS was around 10s, and kit is ~ £80k

Quite a bit then. Looks good though apart from the rear wheels, which im not keen on at all!

[TDT]

caymanRS23 said:

isaldiri said:

You're missing the point of the thing. The full kit costs a fortune due to the aero tat that makes it obvious it's a MR car. Dampers aren't easily visible and therefore aren't quite as interesting.....

Think most would be most interested in just suspension, which can be bought separately

In terms of downforce... in some numbers on t'interwebs from Porsche...

At 200km/h / 124mph, at the rear, with wings in 'performance mode'

4RS - 99kg
4RS MR - 169kg
3RS - 409kg

Not sure what the downforce difference 'feels like', but apparently it equates to a theoretical additional 4-5% lateral grip

Just to complete the table

992 GT3 - 144kg
Cannot fine stated figures for 992 GT3 MR other than +30% Front and +50% Rear

[Sidsw]

TDT said:

Available in Europe in December.
Personally… if i was an owner… I’d possibly only do dampers.

But for the expected full kit price… a standard 992 GT3 is still more car and still a fair lick faster.

Balance is maintained in the Porsche hierarchy.

Would dampers make ride less firm?

[TDT]

Sidsw said:

TDT said:

Available in Europe in December.
Personally… if i was an owner… I’d possibly only do dampers.

But for the expected full kit price… a standard 992 GT3 is still more car and still a fair lick faster.

Balance is maintained in the Porsche hierarchy.

Would dampers make ride less firm?

Damper rate can be opened up to go relatively plush.
Ride would still be ‘firm’ because of spring rate, but less brittle, more controlled particularly on the rebound.
So car won’t pogo around especially on the rear.

[ChrisW.]

Had my 981 GT4 at Knockhill yesterday ... the revised gearing worked really well getting into the very top of 4th by the end of the straights which appeared to be around 114mph (I wasn't looking too closely at the speedo) ... didn't time but was told I was into the '58's ??





It was a great day ... a GT4RS on the same tyres was 1 to 2 seconds a lap faster ...

[200Plus Club]

Who did your gearing abd what sort of cost out of interest?
Lightened flywheel also?

[ChrisW.]

The revised crown wheel and pinion and light weight flywheel and clutch were supplied by RPM Technik and fitted by Strasse who have looked after the car since I started to modify it.

It's not an easy job because the old pinion bearing has to be pressed off and if damaged Porsche do not supply this ... but RPM have these and were very supportive. As a matter of interest, the original pinion case hardening was after 30,000 miles starting to break down ... this may be the limiting factor in the maximum recommended torque of the GT4 gearbox and regular gearbox oil changes were recommended to prevent this happening again with the new pinion that was fitted.

'Worth mentioning is that this can also happen on standard cars, Porsche will not supply the pinion alone so the choice then would be either to fit the revised crown wheel and pinion from RPM or try to find a replacement from one of the early failed gearboxes if one can be found. My car is a very early car with the splined rather than the welded third gear ... designed to be good for 400 ft lbs ...

[ChrisW.]

isaldiri said:

caymanRS23 said:

In terms of downforce... in some numbers on t'interwebs from Porsche...

At 200km/h / 124mph, at the rear, with wings in 'performance mode'

4RS - 99kg
4RS MR - 169kg
3RS - 409kg

Not sure what the downforce difference 'feels like', but apparently it equates to a theoretical additional 4-5% lateral grip

70kg of extra downforce on a 1500kg (car+driver approx) would be that 4-5% added grip. That then translates to something like a 2-3% increase (square root of whatever that extra grip iirc) in theoretical maximum speed one could be taking a corner which...... may or may not be relevant I suppose.....

but I freely admit to being somewhat biased having said before quite a few times, downforce on a road car especially for most 'normal' drivers is not particularly relevant so take with relevant pinch of salt as required.

And at the cost of increased drag, fuel consumption and reduced top speeds ... in the case of the 992 GT3 RS also at the cost of severely compromised luggage capacity ! But it's still a great toy

[AndrewD]

TDT said:

Available in Europe in December.
Personally… if i was an owner… I’d possibly only do dampers.

But for the expected full kit price… a standard 992 GT3 is still more car and still a fair lick faster.

Balance is maintained in the Porsche hierarchy.

I’m thinking same (dampers only) for my GT2RS.

The really expensive bits in the MR kit seem to be the carbon stuff.

[ChrisW.]

If you plan to press on as best you can on track, surely cosmetic carbon is the wrong way to go ?

I now drive track days uninsured ... in a car that can be repaired relatively inexpensively should the worst happen.

So long as there is enough adjustment in the suspension to avoid excessive tyre shoulder wear, I would say that the best investment is in quality dampers. Running the kerbs effectively makes a huge difference to track lines and can also make a significant improvement on the PASM systems on the road .... fast bump of three way dampers makes a huge difference ... though I can't speak for the standard fit on a GT2RS ...

[TDT]

AndrewD said:

The really expensive bits in the MR kit seem to be the carbon stuff.

ChrisW. said:

If you plan to press on as best you can on track, surely cosmetic carbon is the wrong way to go ?

Yep indeed. Bit silly really. I took the carbon fibre MR underbody air guides off my car and replaced them with the plastic 4RS part which is exactly the same in shape, profile and dimensions, and in the order of nearly 10x cheaper, lol. I kid you not.
Made sense as i then fitted the rest of the 4RS turning vanes and and guides also.
Does it make a difference? Dunno. It was cheap though for the set and I have no anxiety when running kerbs or sleeping policemen/speed bumps or inclines.

MR part in CF Left, 4RS part in plastic right.



Complete set of 4RS underbody aero installed.