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GT3.1 - pre purchase info

freddie44

Well-known member
Joined
20 Aug 2009
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1,725
Whilst I wait patiently – arghhhghg – for a nice GT3 I thought in the meantime it would be handy to gain some useful info from the folk that already enjoy these cars.

I plan on having Peter Morgan inspect prior to purchase and I've learnt a fair bit about 911's – from my 997 C2S - but a few questions on the 997 GT3 Gen 1's specifically please:

1. Wheels are 235/35/19 & 305/30/19 – what are the choices in the very best tyre stakes?

2. As fresh tyres are only 4mm-ish so do they last longer/made of stronger stuff or do they infact just need replacing more often?

3. The brakes (non PCCB) look the same as my C2S's but I'm guessing this is not the case... what is the difference?

4. Any specific GT3 traits to look out for when I go to view? How long does the LSD last for/work correctly for etc..?

5. What are the first upgrades that really enhance/improve the Gen 1 GT3..? Also - where to buy these from...?

Any surprising info you may have learnt since purchasing your GT3.1 would be most welcomed by me.

Cheers :thumb:

(I can't wait!)
 
freddie44 said:
1. Wheels are 235/35/19 & 305/30/19 – what are the choices in the very best tyre stakes?

I think the GT3 boys will give more definitive answers but I'd have thought you may be sticking to the usual suspects such as Michelins & Bridgestones. Some track day users may be using Toyos?

freddie44 said:
2.As fresh tyres are only 4mm-ish so do they last longer/made of stronger stuff or do they infact just need replacing more often?

I believe 4mm only on the Cup tyres. Otherwise its 8mm on road tyres (marketing literature describes as 'fast road tyres'.

freddie44 said:
3.The brakes (non PCCB) look the same as my C2S's but I'm guessing this is not the case... what is the difference?

The GT3's standard brakes are 350mm all round. The 997 C2S has 330mm brakes at the front only.

Further than this I cannot assist.

Here is the official brochure in pdf format for you:

http://coochas.com/brochures/Resources/997_GT3_RS_gb.pdf

~ Maxie :thumb:
 
Thanks for the Brochure pdf Maxie - very handy - I've just blown the office printing budget on that. Holiday reading at its best tho! :thumb:
 
No disrespect to Peter Morgan and his associates but I would rather have a company like JZM inspect a GT3. They service,repair and sell lots of them :thumb:
 
Roadrunner996 said:
No disrespect to Peter Morgan and his associates but I would rather have a company like JZM inspect a GT3. They service,repair and sell lots of them :thumb:

OK, that's good to know.

I would have thought Peter Morgan has someone who specializes in GT type cars though? Or is it literally just a chap called Peter Morgan who does each and every one!?!?
 
Been a lot of threads in the past on the tyre's and always comes up with michelin PS2's for road tyres.

Listen for knocking in front suspension, most of us have had some issues with front suspension at some point. Fingers crossed mine's sorted now, was due to spring's been worn so had them replaced and all good now.

If car has understeer in corners, probably means the geo is out. I just got mine done, probably one of the first things you should do when you buy a car. Get it done at a decent indy, OPC can only do factory settings and when I picked mine up last week from project 9 it felt like a different car, also not something that would affect OPC warranty.

Any performance upgrades other than sorting out the geo and putting a new set of tyres will invalidate your OPC warranty if you buy one that comes with it. If you're coming from a C2S, the GT3 in standard form should be enough to keep you occupied for a while.

Best performance upgrade is probably some training for yourself from someone like CAT driver training, I've done 2 days with them and it's fanctastic.

PM me if you want more info can give me a call or if you're out Sevenoaks way feel free to pop by to see mine.
 
Thanks JD and thanks for the kind offer.

The suspension info is exactly what I hoped to learn so cheers for that.

Will the Michelin PS2's last well on track too? I think I'd rather have a more track orientated tyre than a road one.

A fresh Geo from day one sound like a good idea and I look fwd to it. So hopefully with a healthy LSD all should be well :thumb:
 
freddie44 said:
1. Wheels are 235/35/19 & 305/30/19 – what are the choices in the very best tyre stakes?

If you are going to track it, the default choice is indeed the Michelin Cup+ (the only track tyre for the type with the Porsche N rating other than the Pirelli Corsa which has always had serious supply issues and usually isn't available anywhere). There is a Dunlop Sport Maxx Race tyre that has recently hit the market which may be good but I don't know anyone who has tried it yet. Continental do the ContiForceContact in the sizes - Sabine Schmitz uses those in her 3.8RS 'ring taxi. Toyo R888s are an option but aren't considered especially good value compared to the opposition.

If you are not tracking their are loads of options. The obvious one is the N rated Michelin PS2 (overheats a bit too quickly on track, but a decent road tyre), but the newer (not N rated) Michelin Supersport is a better tyre. There are plenty of other options (N rated and not) from the likes of Bridgestone, Pirelli, Continental, Dunlop and the less obvious brands like Falken. The sizes are actually not that uncommon so if you aren't in a factory warranty there is plenty of choice.

Note however that if you want to put winters on it you will really need an extra set of rims with narrower rears for 295 tyres (the recommended winter size).

freddie44 said:
2. As fresh tyres are only 4mm-ish so do they last longer/made of stronger stuff or do they infact just need replacing more often?

On the road they do not last longer that you would expect for a tyre with that much depth. If used on track it is a different discussion.

freddie44 said:
3. The brakes (non PCCB) look the same as my C2S's but I'm guessing this is not the case... what is the difference?

They are bigger for a start (and consequently more expensive) and have 6 piston callipers on the front compared to 4 on a Carrera. The ABS threshold is different and they have additional ducting for cooling too.

freddie44 said:
4. Any specific GT3 traits to look out for when I go to view? How long does the LSD last for/work correctly for etc..?

It varies significantly depending upon use and driver. The simplest clue that it is done is if it doesn't try to help to stall the engine when reversing around a corner. If a GT3 is smooth and pleasant to reverse around the corner (especially to someone not used to them) the diff likely needs rebuilding.

The most obvious of all GT3 foibles though (in a day to day driving context) is that the gearbox isn't very nice until the oil is up to temperature. If it has been standing for a few days then the engine will sound alarmingly mechanical for a couple of seconds when fired up too. These sort of things make it difficult to give simple advice as when it is cold and you are driving slowly it feels more like an older 911 than something of its vintage. Some people find a cold GT3 a bit horrible to drive until they get addicted to them, but it has plenty of "they all do that sir"s in its repertoire.

freddie44 said:
5. What are the first upgrades that really enhance/improve the Gen 1 GT3..? Also - where to buy these from...?

This very much depends upon what you are looking to achieve and how much you are prepared to spend. I honestly recommend keeping it how it comes (parts wise) for a good year or so to get a better feel for where you want to take it. If it isn't set up in a way that you like then have someone known for GT3 setups (you don't have to search hard for a recommendation) change the suspension geometry on it for you but for the most part - track days with driver instruction are the best use of your money as you can take driver upgrades between cars at no extra charge

freddie44 said:
Any surprising info you may have learnt since purchasing your GT3.1 would be most welcomed by me.

I've only ran the 996.2 and 997.2 flavours of GT3, but there is a lot of commonality between the whole family tree. Using forum searches will give you plenty of back reading - GT3s are very extensively discussed. :thumb:
 
Superb Disco, thanks very much :thumb:

It will be most useful to come back to that for a read when I go for test drives. I wonder if the garage guy will know why I want to reverse a GT3 around a corner...?!!! :D
 
Ow this is very nice indeed! :D

I thought every 997 GT3 Gen 1 had a stopwatch on the dash al la sports chrono..?

porsche-911-gt3-997-gt3-S695152-9.jpg
 
Roadrunner996 said:
No disrespect to Peter Morgan and his associates but I would rather have a company like JZM inspect a GT3. They service,repair and sell lots of them :thumb:

+1

For GT3's PPI you need to speak to JZM, Parr, RPM Technik, companies who specialise in these cars and really know what's what.
 
Thanks for that 911UK peeps, completely agree :thumb:

Anyone able to answer why this GT3 Gen 1 doesn't have the stopwatch? I know the GT3 only has a 'sport' button as a kinda other functionality/option so when this is pressed (in this car) I guess there in no sports chrono type increase in revs.. :?

I actually prefer it without so if its just a stopwatch missing i'm even more keen on it! :D
 
freddie44 said:
Anyone able to answer why this GT3 Gen 1 doesn't have the stopwatch?

I actually prefer it without so if its just a stopwatch missing i'm even more keen on it! :D

The wart was an optional extra; either Chrono Package (I-639) if the car was not fitted with PCM or Chrono Package Plus (I-640) if the car was fitted with PCM.
 
So as it has PCM it doesn't have the chrono plus..

Not sure that matters much does it..?

Cheers :thumb:
 
freddie44 said:
So as it has PCM it doesn't have the chrono plus..

Not sure that matters much does it..?

Cheers :thumb:

Not quite how I meant it. If your car has PCM, then the original owner could also have opted for Chron Plus (I-640), but obviously didn't.
If the car had not had PCM, then the buyer could have opted for the normal Chrono Package (I-639), but not for I-640.
 

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