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My GT3 Alignment + Video

PhilMorrison

Monza
Joined
30 Apr 2013
Messages
160
After doing a bit of research, and getting some great advice from here, I had done a basic front camber change a few weeks ago, but still found the car a little understeery, so decided to do it properly, and settled on this as a starting point for an alignment.
Front
Ride Height 94mm.
ARB: 2nd softest.
Camber: 3* 05.
Castor: Not adjustable, but 7* 55.
Toe 08 minutes out either side.

Rear
Ride Height 120mm
ARB: Full hard.
Camber: 2*20
Toe: 15 minutes in either side.

Results, as suspected on the road it tramlines a little, but isn't too bad over all. On the track it's got rid of almost all of the understeer, and I found the car much more neutral, and confidence inspiring on the brakes. I was on the markers on the rear Cups, so I'm not sure if that's to blame, but it was perhaps a little more tail happy than necessary, which although hugely enjoyable did show with slightly more inner rear tyre wear than outer.

I think I'll pull a little camber off the rear, probably to 2*, and perhaps go one softer on the rear arb to see where it puts us.

Here's a vid. Rockingham appears to absolutely destroy tyres, and it got a bit boring after a while.
Feel free to critique my driving. I've never driven a Porsche before this one, and I am loving it, but know I could be a fair bit faster.
P.S. I'm going to try the spot exposure setting on the GoPro next time as outside the car is over exposed. It's better if you view it on Youtube rather than the embedded version.


 
Couple of changes I know it's all very personal but try 1 stop harder on front ARB and one stop less on rear.

With that camber you'll kill tyres real soon try 2 deg all round until you've got some track miles behind you especially if you're running street tyres.

8 min toe out front's a bit ambitious, try zero toe or 2 min out. As said, front will be nervous on street with toe out.

I do all my own geo with string (fishing line actually) gives half milimeter resolution and the whole things just totally planted. I can approach any corner slow or fast and once fronts loaded up hurl it in and the grips relentless, just never gives up. Took a while to get there though.
 
Front camber should be fine, my front tyres hardly seem to wear. I run about 3 degrees front on the 996, toe zero ish, 9 degrees castor.

What was your rear tyre pressure like Phil?

You rears were behaving like mine at Silverstone towards the end of a 15 minute session.

I'd be interested to hear the difference in dropping rear camber down to 2 from 2.2. I'd guess that you can drop camber running 19inch tyres compared to 18 inchers. Less sidewall flex blah blah....

The marbles at Rockingham towards the end of the day can be shocking!
 
I don't think I need to pull the front camber back. The turn in is vastly improved with the 3*, and much like you Max, tyre wear seems pretty spot on. I will try 0 front toe though.

I was running 29psi front and 32psi rear and tried to keep it at that when hot. The TPMS was going spazzy though.

Yeah you have to make sure you are the fastest at Rockingham as every time you go off line the car gets completely covered in rubber!
 

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