Can a 997 Cup car be converted to road legal?
Discussion
Have just bought a 993 cup ..................i insist driving to and from track days ..................its not ideal for this is an understatement ............i ve already owned two Clubsports, 993 rs and 993 gt2 ..............this is another world , great on track nightmare on road ! Clutch like Rob said , noi heating watsoever ..........have had to fit silencers for track days but the noise inside is serious without a helmet !
Baby Blue said:
Have just bought a 993 cup ..................i insist driving to and from track days ..................its not ideal for this is an understatement ............i ve already owned two Clubsports, 993 rs and 993 gt2 ..............this is another world , great on track nightmare on road ! Clutch like Rob said , noi heating watsoever ..........have had to fit silencers for track days but the noise inside is serious without a helmet !
The 7 would be worse I think as it has the sequential dog box. I am guessing the 993 cup doesn't?DanH said:
Baby Blue said:
Have just bought a 993 cup ..................i insist driving to and from track days ..................its not ideal for this is an understatement ............i ve already owned two Clubsports, 993 rs and 993 gt2 ..............this is another world , great on track nightmare on road ! Clutch like Rob said , noi heating watsoever ..........have had to fit silencers for track days but the noise inside is serious without a helmet !
The 7 would be worse I think as it has the sequential dog box. I am guessing the 993 cup doesn't?Guess straight cut and with sintered clutch .....................as i am very old, i have a heavy but not full race clutch , i get a chance, its not in or out , but still look like learner driver kangeroo hopping round North Circular rd................i also have a 6 speed manual , steel synchros but not a prob ...............its great when u get to the circuit and its almost all worth it but on the road its really no picnic ..............power band 5000 -7000! Also great in a traffic jam !
A dog leg gearbox is one where 1st gear is away to one side and 2nd/3rd 4th/5th are in line. The theory behind them is that you only use 1st gear for pulling away after a complete stop and after that it isn`t needed. When racing a simple forward / backwards gear change is quickest. if you need to go left and right as well it slows you down by a few milli-seconds. It also stops you engaging 1st gear by mistake as many have a gate preventing entry into 1st gear once under way.
A sequential gearbox, as fitted to the 997 cup car is one where gear changes are made by pushing forwards or pulling backwards on the gear lever and all the gears are in line. There is a release handle which allows you to engage reverse once past 1st and in neutral. As supremely quick way of changing gears. Throttle cut switches allow for an almost flat trace on the upshift meaning no loss of power of de-stabilisation of the car through a corner. This allows you to select the optimum gear for corner entry and a change mid corner rather than picking a gear that is slightly too high on corner entry and driving through without a gearchange.
The term Dog box is often used to describe the way in which gears in a sequential gearboxes like the Porsche 997 engage and hold themselves in gear. A standard gearbox has small dog teeth which enable accurate placement of the main gears, these are damaged by changing out of gear too early before the clutch is fully engaged rounding off the tips. This rounding of the tips often results in difficult gear selection as two flat surfaces push against each other rather than two points meeting and going one way or the other into gear.
On a dog box the teeth are much larger and do the complete job of engaging / holding in gear by way of a slight dovetailing. When they wear the car jumps out of gear. Motorbikes use dog boxes.
Is that not the most perfect lead in for you Barry....
Hope that all makes sense.
Henry
A sequential gearbox, as fitted to the 997 cup car is one where gear changes are made by pushing forwards or pulling backwards on the gear lever and all the gears are in line. There is a release handle which allows you to engage reverse once past 1st and in neutral. As supremely quick way of changing gears. Throttle cut switches allow for an almost flat trace on the upshift meaning no loss of power of de-stabilisation of the car through a corner. This allows you to select the optimum gear for corner entry and a change mid corner rather than picking a gear that is slightly too high on corner entry and driving through without a gearchange.
The term Dog box is often used to describe the way in which gears in a sequential gearboxes like the Porsche 997 engage and hold themselves in gear. A standard gearbox has small dog teeth which enable accurate placement of the main gears, these are damaged by changing out of gear too early before the clutch is fully engaged rounding off the tips. This rounding of the tips often results in difficult gear selection as two flat surfaces push against each other rather than two points meeting and going one way or the other into gear.
On a dog box the teeth are much larger and do the complete job of engaging / holding in gear by way of a slight dovetailing. When they wear the car jumps out of gear. Motorbikes use dog boxes.
Is that not the most perfect lead in for you Barry....
Hope that all makes sense.
Henry
Sorry for the thread hijack, but...
Could you chaps inform me of the difference, if any, between a 996 cup engine and a 996GT3 road car engine? I understand that the engines and gearboxes are lifed on the Cup... but does this only apply to race use (clearly harder than track day use) or track day use? Or would it be possible to run a Cup car,as a recreational trackday car without an engine/gearbox rebuild every 3 years?
Just wondering how tricky it would be to run a 996 cup car as a trackday/sprint car and the running costs involved as they seem to be getting more and more affordable!!
Thanks.
Could you chaps inform me of the difference, if any, between a 996 cup engine and a 996GT3 road car engine? I understand that the engines and gearboxes are lifed on the Cup... but does this only apply to race use (clearly harder than track day use) or track day use? Or would it be possible to run a Cup car,as a recreational trackday car without an engine/gearbox rebuild every 3 years?
Just wondering how tricky it would be to run a 996 cup car as a trackday/sprint car and the running costs involved as they seem to be getting more and more affordable!!
Thanks.
Henry-F said:
The term Dog box is often used to describe the way in which gears in a sequential gearboxes like the Porsche 997 engage and hold themselves in gear.
You can also use dog engagement gears on normal H pattern boxes. The Imp transaxle in my Davrian has this. No need for the clutch on upchanges provided you are firm with it and also on downchanges if you can give it a bit of a blip at the same time to help it.There is a difference between a dog leg gearbox (which relates to the gear positions only - the change from 1st to 2nd is the shape of a dog's leg!) and a dog box, which Henry has explained all about. They are separate features entirely and not really related.
Regarding putting a Cup car on the road, if it's to do track days you'd be better off paying someone to transport the car for you than eating clutches, you'll arrive at the circuit more refreshed too. Same is true if you buy a trailer and take it there yourself, as most do.
Regarding putting a Cup car on the road, if it's to do track days you'd be better off paying someone to transport the car for you than eating clutches, you'll arrive at the circuit more refreshed too. Same is true if you buy a trailer and take it there yourself, as most do.
......you'd be better off paying someone to transport the car for you than eating clutches, you'll arrive at the circuit more refreshed too.......
You called?
www.flyingbluedog.co.uk
You called?
www.flyingbluedog.co.uk
All you need is road tyres and then an MOT. Typical items that may not normally pass an MOT on a race car can be headlight alignment, lack of horn, lack of washers - all stuff that's easy to sort out of course. Still wouldn't want to though. I've just driven 250 miles in GT3 RS's today which wasn't all that arduous but they would never be my first choice for such a trip and a Cup car would be many times worse.
Gassing Station | Porsche General | Top of Page | What's New | My Stuff