LuckyP

Had a long chat with Andreas at the Porsche Cafe at Goodwood on Saturday. I was very keen to ask him a few questions:

Q1) Why did my car have to have it's rear ARB bushes and drop links changed at the 12,000 service (as in the service manual)?

A1) They had found that the material that the bushes were made from could 'dry' over time and could create a notchy movement of the ARB causing irratic rear axle movement under load. Changing the bushes and the droplinks at 12,000 and 24,000 miles illiminates this risk, long before it could occur.

Q2) Are the new Centre Locks the same?

A2) Yes - exactly. Just the 500Nm script removed. He faught against this but the legal people wanted it changed.

Q3) My ABS seems to activate very early compared to other cars I've driven.

A3) He asked what Geo I had. I told him 3 degs up front and 2.5 at the rear. He almost spat his dummy and asked why you track boys go so extreme on road tyres!!! He said that these figures would cause early ABS activation and upset the balance of the car. He said that the 1'30" that is in the manual has been proven by his team to offer the fastest track set up!

He did however say that the factory settings should be checked when new as he thought the accuracy of the fac setting might be a little suspect!!

So - I've bought a probe type pyro and will get some figures this weekend. I'll be torn between cooling the PCCBs down and getting the tyres in hot!!!! I feel a rather faster in lap coming on - with no brakes!!!!

Thanks Andreas!!

911SLOW

A1) hmmm

A2) aha

A3)


PS. good call on the pyro and great suggestion to check alignment same day you buy a GT car.

LuckyP

I know, I felt like I was at school again!!!

TRAKCAR

Thanks for asking the questions and posting them here.

2.5 front and 1.7 rear gave me the right temps with RA1, I think grip is the same as the OEM tirs and I could probably back off a bit oif front camber to get a bit mor bite under braking.
Hoosier was perfect -2.5 front and -2.5 rear. helps with wear too, nice and even.
Everything else I left factory, except en even 10mm lower front and rear, same rake, same zero to front and 2mm each side rear. Seems to work.

Nizer

And your point is?

TRD0524

What is the heat capacity of the Thermosensor on the pyrometer, and the heat reading capacity of the actual unit?

amaist

If the factory camber setting is correct why do I wear out the outside shoulders on the tires so fast?

I can cord them while the insides have plenty of tread left. My mechanic tells me to slow down. I already drive like a geezer. I would cause a traffic jam on the track by slowing down.

You don't need Herr Preuninger to tell you you need a pyrometer. If you want to check your setup at the track it's essential.

mdrums

Are there different alignment specs for GT3 and GT3RS? Can anyone post the specs? Thanks!

911SLOW

The 4L RS is different. : )

Adjustment values for suspension alignment


The following values relate to the empty weight, i.e. full fuel tank/fluid reservoirs, vehicle with tools, but without driver or additional weights!

911 GT3/GT3 RS (997)
RoW/USA

911 GT3 RS 4.0 (997)
RoW/USA (2011 model)


911 GT2 (997) RoW/USA

mdrums

Thanks Slow! Now I have to figure out hw to convert all this to degrees.

FFaust

Pyrometer is next on the list for me

Crazy Canuck

and a crew

LuckyP

Dunno......

http://www.demon-tweeks.co.uk/Motors...r/1239/0/15775

911SLOW

https://rennlist.com/forums/997-gt2-...ht=minutes+toe

TeamDrugMoney

LuckyP, thanks for sharing your info. It is interesting for muptiple reasons!