Henry Catchpole in sharkwerks porsche GT4
Discussion
Porsche911R said:
I wish they would admit it some times rather than the crazy hype of the cars !
But that is to assume that a majority finds gearing too long but is intent on hiding the fact. Some certainly do find the gearing long because they have changed it via final drive (usually) or a re-gear (less often).
I am certain there are others that find it suboptimal at times but don't feel it is enough to bother changing out - probably because the car sees a variety of uses and needs flexibility at the expense of outright optimisation.
If I had to guess though, i would suggest that most owners likely find it fine. I would also guess that most GT4 owners could be put into the same groups as above.
The thing about anything qualitative. It is all just ice cream flavours.
Individual preference for gearing = GT3's are crazy hype is quite a reach.
Could it not for instance be more convincingly counter argued that the ease with which the transmission can be re-geared, and the significant catalog of factory produced gear sets available for the GT3 cars partly justify this "hype" if one carries an opinion that gearing is such a critical aspect of a car - particularly when factory gearing support is absent on other cars across the brand that weren't fortunate enough to share the same basic gearbox.
So much BS on this forum.....
If you're worried about the gearing, just buy smaller wheels and keep the profile ratio and width of tyre the same. This will give a smaller rolling radius, and will achieve exactly the same effect as reducing the final drive.
As for more power - 200 cell cats, throttle body and remap are a no-brainer to me. This is an un-stressed, many say detuned, engine. Taking it up to c415bhp should be easy and also deals with the small drop in torque c5000revs.
These are awesome cars...
All this talk of breaking the speed limit is soooo tedious.
If you're worried about the gearing, just buy smaller wheels and keep the profile ratio and width of tyre the same. This will give a smaller rolling radius, and will achieve exactly the same effect as reducing the final drive.
As for more power - 200 cell cats, throttle body and remap are a no-brainer to me. This is an un-stressed, many say detuned, engine. Taking it up to c415bhp should be easy and also deals with the small drop in torque c5000revs.
These are awesome cars...
All this talk of breaking the speed limit is soooo tedious.
richyd said:
So much BS on this forum.....
If you're worried about the gearing, just buy smaller wheels and keep the profile ratio and width of tyre the same. This will give a smaller rolling radius, and will achieve exactly the same effect as reducing the final drive.
.
THat plays havoc with PSM, abs, auto blip etc etc and you are NOT insured . If you're worried about the gearing, just buy smaller wheels and keep the profile ratio and width of tyre the same. This will give a smaller rolling radius, and will achieve exactly the same effect as reducing the final drive.
.
So while a nice idea to fit small wheels electronics these days don't gel and also it looks stupid and makes the car scrape even more than it does now which would be crazy.
Porsche911R said:
richyd said:
So much BS on this forum.....
If you're worried about the gearing, just buy smaller wheels and keep the profile ratio and width of tyre the same. This will give a smaller rolling radius, and will achieve exactly the same effect as reducing the final drive.
.
THat plays havoc with PSM, abs, auto blip etc etc and you are NOT insured . If you're worried about the gearing, just buy smaller wheels and keep the profile ratio and width of tyre the same. This will give a smaller rolling radius, and will achieve exactly the same effect as reducing the final drive.
.
So while a nice idea to fit small wheels electronics these days don't gel and also it looks stupid and makes the car scrape even more than it does now which would be crazy.
Porsche911R said:
richyd said:
So much BS on this forum.....
If you're worried about the gearing, just buy smaller wheels and keep the profile ratio and width of tyre the same. This will give a smaller rolling radius, and will achieve exactly the same effect as reducing the final drive.
.
THat plays havoc with PSM, abs, auto blip etc etc and you are NOT insured . If you're worried about the gearing, just buy smaller wheels and keep the profile ratio and width of tyre the same. This will give a smaller rolling radius, and will achieve exactly the same effect as reducing the final drive.
.
So while a nice idea to fit small wheels electronics these days don't gel and also it looks stupid and makes the car scrape even more than it does now which would be crazy.
Not going to happen.
isaldiri said:
Well for iron brake cars it's not a problem. the gt4 clubsport runs 18" wheels for example...
the CS car runs smaller brake disks also ;-) and has shorter ratio's and real shocks and Adjustable sus.Proves a point a normal GT4 is nothing like a CS car now ! they did try it fully weighted up and PASM but it was not competitive.
no shock to get the lap time down, carbon doors etc, passive shocks with adjustable roll bars are now added and a Motec style control unit.
Edited by Porsche911R on Wednesday 7th December 19:22
Porsche911R said:
the CS car runs smaller brake disks also ;-) and has shorter ratio's and real shocks and Adjustable sus.
the clubsport has 380mm front and rear rotors - exactly the same sizes as the road car. What relevance does the dual clutch gearbox and non pasm (probably due to racing regs banning anything active) suspension have as well wrt to brake/wheel sizes...?
isaldiri said:
the clubsport has 380mm front and rear rotors - exactly the same sizes as the road car.
What relevance does the dual clutch gearbox and non pasm (probably due to racing regs banning anything active) suspension have as well wrt to brake/wheel sizes...?
the over all effect of the CS car with smaller wheels and PDK means IT already has a short set of ratios 2 fold.What relevance does the dual clutch gearbox and non pasm (probably due to racing regs banning anything active) suspension have as well wrt to brake/wheel sizes...?
They fitted passive shocks because the PASM system was just not working well enough.
I stand corrected on the disk size thanks ;-) (I am wrong some times doh) lol
"Racing-specific hydraulic 2-circuit brake system, internally
vented steel brake discs, D = 380 mm, one-piece 6-piston
monobloc fixed callipers"
fioran0 said:
The GT4 CS uses performance friction calipers AFAIK. This is a shallower caliper.
I wonder if there could be a solution using 997 GT3 calipers on the GT4 street wheel carriers that lets 18s fit. Its a shallower caliper too so may help them squeeze on there.
DeMan Racing have an 18" conversion, not much detail on their site though I wonder if there could be a solution using 997 GT3 calipers on the GT4 street wheel carriers that lets 18s fit. Its a shallower caliper too so may help them squeeze on there.
http://demanmotorsport.com/services/#tab-1-0-gt4-u...
fioran0 said:
In fact many GT3 owners do feel the gearing is too long, and the spacing is often considered rather imperfect. That is why there are a bunch of cars running a shorter final drive - and others with re-gears.
Here are some quick gearing charts for the various factory GT3 configurations versus the GT4. This perhaps puts some meat on the issue some have with the GT4's gearing. Individual gear ratios are just one part of the drive system. Final drive, tire size and RPM are also relevant. It is easy to look at one aspect in isolation and miss the story.
Great stuff, thanks. Here are some quick gearing charts for the various factory GT3 configurations versus the GT4. This perhaps puts some meat on the issue some have with the GT4's gearing. Individual gear ratios are just one part of the drive system. Final drive, tire size and RPM are also relevant. It is easy to look at one aspect in isolation and miss the story.
Edited by fioran0 on Tuesday 6th December 22:56
No idea where that post went!!!
The GT4 CS uses performance friction calipers AFAIK. This is a shallower caliper.
I wonder if there could be a solution using 997 GT3 calipers on the GT4 street wheel carriers that lets 18s fit. Its a shallower caliper too so may help them squeeze on there.
I have heard that 18" wheels can fit but it was cigarette paper stuff between the barrel and the caliper. You would need to be a brave man to run them like that which is likely why most cars I have seen going with downsizing seem to stop at 19" from what I have seen.
For those with a GT4's did you try to get smaller? Any feedback? Theres obviously a bunch of slicks open up if you can get to 18"
On the benefits of smaller wheels. Heres gear charts for a GT4 with a 19" wheel versus a stock 996 GT3 and then versus a 996 GT3 with a 4.0 R&P - a fairly ubiquitous mod for those cars that see track action.
The GT4 CS uses performance friction calipers AFAIK. This is a shallower caliper.
I wonder if there could be a solution using 997 GT3 calipers on the GT4 street wheel carriers that lets 18s fit. Its a shallower caliper too so may help them squeeze on there.
I have heard that 18" wheels can fit but it was cigarette paper stuff between the barrel and the caliper. You would need to be a brave man to run them like that which is likely why most cars I have seen going with downsizing seem to stop at 19" from what I have seen.
For those with a GT4's did you try to get smaller? Any feedback? Theres obviously a bunch of slicks open up if you can get to 18"
On the benefits of smaller wheels. Heres gear charts for a GT4 with a 19" wheel versus a stock 996 GT3 and then versus a 996 GT3 with a 4.0 R&P - a fairly ubiquitous mod for those cars that see track action.
on track the longer gearing is not really an issue due to where the torque is.
MY Cayman R wheels are a bolt over at 19" but never tried it and you end up with 265's rear.
The best mods any one can do first is a geo with rear toe links, and 2nd sort out the Porsche restricted engine map.
we have a lot of free BHP and torque waiting for us, well and that torque dip needed sorting.
if you looks at the sharkwerks car now it's looks plenty fast enough and sounds amazing.
In fact proper GT now imo
https://youtu.be/ULIuS_wO6o0
MY Cayman R wheels are a bolt over at 19" but never tried it and you end up with 265's rear.
The best mods any one can do first is a geo with rear toe links, and 2nd sort out the Porsche restricted engine map.
we have a lot of free BHP and torque waiting for us, well and that torque dip needed sorting.
if you looks at the sharkwerks car now it's looks plenty fast enough and sounds amazing.
In fact proper GT now imo
https://youtu.be/ULIuS_wO6o0
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