Prospective 981 GT4 Owners Discussion Forum.

[HokumPokum]

seawise said:

works for me, really looking forward to getting one and I think the reviews are the best to be expected given the cars specification. I am buying one to compliment a GT3, not replace it. I am sure I am not the only person doing same. I very much doubt anyone is trading down from a GT3 to a GT4. Therefore to compare one with the other is rather ridiculous. Of course the drivetrain of the GT3 is much more engaging, that's what you are paying for over a GT4 (should they both remain available to purchase new). The fact Porsche can still produce these kind of cars for the buying public (ahem...) should be cause for rejoicing, not bickering.

not heard of anyone specifying the 'track app' - does that include an on board video that you can play back ? I think i'll just strap a 'go-pro' to the roll cage.

Will do min 2 max 4 track days a year (Spa and the Nordschiefe), am I making a mistake to spec PCCB's ? Had them before on a gen1 997 RS and they stood up to track use very well. Maybe I wasn't trying hard enough !

In your case, spec the PCCB. you get the bargain 918 spyder brakes. If it is good enough for the 887bhp and much heavier 918, it will be good enough for the Gt4.

I will do double that and I am still thinking of speccing them. The only issue I have is the steel stock brakes are already overkill, offer plenty of pad choice and will have less initial bite. So, does simply having bargain 918 brakes and massive over-sized discs enveloped by barely fitting 20 inch rims stroke your vanity enough to want them?

[bigmowley]

HokumPokum said:

In your case, spec the PCCB. you get the bargain 918 spyder brakes. If it is good enough for the 887bhp and much heavier 918, it will be good enough for the Gt4.

I will do double that and I am still thinking of speccing them. The only issue I have is the steel stock brakes are already overkill, offer plenty of pad choice and will have less initial bite. So, does simply having bargain 918 brakes and massive over-sized discs enveloped by barely fitting 20 inch rims stroke your vanity enough to want them?

Yep

[subirg]

anonymous said:

[redacted]

This is a funny post. If the gear ratios are wrong, it doesn't matter if the box is manual or pdk, the driving experience will be compromised.

[SRM355]

oops, I didn't mean to start a manual vs PDK debate! I'm a die hard manual fan, but do admire the PDK box for all its merits - having driven a Cayman with PDK I must say the PDK is extremely impressive (but I would still have a manual!). My only thought was the ratios might be stacked tighter as more gears on the PDK so would make the car a bit more urgent in gear. Like many others on here with deposits in, keeping my fingers crossed I get a car, I will shamelessly carry on whoring myself to my local dealer until I get a car!!!

[Robbo66]

seawise said:

Well Mr Harris video seems a lot more positive than his written review, the car looks and sounds pretty special. I am suitably reassured.

Only my opinion Oliver, but the gearing surely could have been shorter. I think if I had the 996RS in the stable, as you do, this wouldn't see the light of day.
When are you off to Spa ?.....a couple of us looking too.

[seawise]

Robbo66 said:

Only my opinion Oliver, but the gearing surely could have been shorter. I think if I had the 996RS in the stable, as you do, this wouldn't see the light of day.
When are you off to Spa ?.....a couple of us looking too.

Rob,

yes it's a pity about the gearing, agree, but otherwise I think it'll be a fun thing for the odd track day and fast road use. and it hasn't been plastered with go faster stickers, which is a bonus! Of course I will prefer the GT3 on track, but it's not getting any younger and I want to semi-retire it from hard track use. not polishing though, sod that !

Spa will be the RMA day in May, 10th or 11th I recollect.

Oliver

[Smi1er]

HokumPokum said:

In your case, spec the PCCB. you get the bargain 918 spyder brakes. If it is good enough for the 887bhp and much heavier 918, it will be good enough for the Gt4.

I will do double that and I am still thinking of speccing them. The only issue I have is the steel stock brakes are already overkill, offer plenty of pad choice and will have less initial bite. So, does simply having bargain 918 brakes and massive over-sized discs enveloped by barely fitting 20 inch rims stroke your vanity enough to want them?

Do you know the weight difference? I would expect the PCCB to be considerable lighter and reduce unsprung mass. That's why I would want to specify them over cast iron.

[HokumPokum]

about 45 pounds. but Walter Rohl admits to not being able to tell the difference on track. But weight savings is real.

[PorscheGT4]

PCCB are normally bigger so that offsets the weight

Porsche always show like for like size on weights.

[HokumPokum]

45 pounds. check the 991 Gt3 forums on RL.

[swimd]

PorscheGT4 said:

PCCB are normally bigger so that offsets the weight

Porsche always show like for like size on weights.

The weight difference between the GT4 steel brakes and GT4 PCCBs is 17kg.
They say as a rule of thumb that weight reduction in unsprung mass counts double so yes, it's quite significant. I wish Porsche offered a resurfacing service or trade-in program for the rotors, then I'd spec ceramics in a heartbeat.

Small sidenote, the side bolster of the bucket seat in the RS (same as in the GT4) looks quite battered already. I was hoping they solved that excessive wear problem. Cue for all the non-owner keyboard warriors telling me to post on mumsnet...

[PorscheGT4]

"The weight difference between the GT4 steel brakes and GT4 PCCBs is 17kg."

where is that published ?

[AdamV12V]

swimd said:

Small sidenote, the side bolster of the bucket seat in the RS (same as in the GT4) looks quite battered already. I was hoping they solved that excessive wear problem. Cue for all the non-owner keyboard warriors telling me to post on mumsnet...

Eeek - nasty, I assume that is at the motor show this week? I guess that probably has had 1001 fat a**es in it who couldn't care less how they got in and out, but still you would have hoped they would be more resilient than that.

[cymario]

I am just playing around a little with the configurator. What is the general opinion on the sports chrono package. Is it still worth opting for since, in this instance, it doesn't effect in any way the way that the car will drive and is effectively just a gimmick.

[swimd]

PorscheGT4 said:

"The weight difference between the GT4 steel brakes and GT4 PCCBs is 17kg."

where is that published ?

Porsche Stuttgart, answer to direct request from a pff member

Porsche said:

1. Gewichtsersparnis I-Nr. 450 – Porsche Ceramic Composite Brake (PCCB) vs. serienmäßige Bremsanlage: ca. 17 kg
2. Gewichtsersparnis I-Nr. 574 – Entfall Klimaanlage vs. serienmäßige Klimaanlage: ca. 9 kg
3. Gewichtsersparnis I-Nr. P11 – Vollschalensitze vs. serienmäßige Sportsitze Plus: ca. 6,5 kg/Sitz
4. Genaue Federraten: Vorderachse 45 N/mm, Hinterachse 80 N/mm (Helperfedern 15 N/mm)

[PorscheGT4]

as timing is banned on all UK track days it seems a pointless add on

[cymario]

PorscheGT4 said:

as timing is banned on all UK track days it seems a pointless add on

I think I agree. The only benefit is the physical clock which does, I suppose, improve the look of the dash a little. Expensive though!

[Digitalize]

PorscheGT4 said:

as timing is banned on all UK track days it seems a pointless add on

So is filming at most, especially hand held. People still do it. Just to cover their backs. Racing is also banned but you're a liar if you don't try and race other cars.

[PorscheGT4]

never know of filmimg to be banned, most are fixed units these days and are allowed.

never seen people do hand held filming they would be thrown off.

Don't really see racing either, but I tend to use good Track day organisers who would send these idiots home.

[Smi1er]

swimd said:

The weight difference between the GT4 steel brakes and GT4 PCCBs is 17kg.
They say as a rule of thumb that weight reduction in unsprung mass counts double so yes, it's quite significant. I wish Porsche offered a resurfacing service or trade-in program for the rotors, then I'd spec ceramics in a heartbeat.

Thanks for the info. I measured a 396mm CCB disc vs a 389mm cast iron disc from another manufacturer in the past and the weight difference was around 7kg. Taking into account other differences in the setup and less weight save for the rear discs, then its hard to question the 17kg. Like you, they'd be one of the first options I would spec.