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Thanks for chiming in, this is super helpful as I've been digging around in a lot of old threads.
Originally Posted by powdrhound
For a RWD set up, go with 1º more negative camber in the front than rear. Set up the car with a 20mm rake based off the chassis measuring points. I run 102/123 and it works very well. Make sure PSM is fully disconnected (by pulling the plug under the master cylinder), not just turned off with the dash button.
My AWD alignment numbers are above. I've been running 2.6F/2.2R which made the car twitchy when converting to RWD.
Was researching your #s along with heavychevy's. Will look to stick with over -2F/1.5R. Toe needs to be reset so I'll have to take a look at your numbers further.
Am very used to the no PSM on track, it kicks in at strange points.
Originally Posted by powdrhound
As far as NT01s, go with a 245/40 and 305/35 combo. Do not go with a 315/30/18. I've run 25+ sets of NT01s over the last 4 years and the 315/30/18 is not good choice. It works but for RWD the taller 305/35 is a much better option, less rollover, higher load rating, larger contact patch, more grip. If you have fully adjustable LCAs and full mono *****, you can fit 275/335 NT01s with a little bit of modding. Those are the best choice.
I'll have to give those numbers a shot on my next set. 235/315 has been working fine even though they are not perfect. My 9/12 CCWs in GT2 offsets allow a lot of options.
Originally Posted by powdrhound
Bring that thing down to Miller in September to run the 4.5 mile course. We have a group of us going...
Love lapis blau, but I'm a bit biased..
Would love to come down, first born in August might make that a little tough! I'm sure you all will have enough fun without me
Look forward to hearing how you like it compared to old settings on the track Friday.
Where'd you have do the corner balance/alignment and dyno runs done in this area?
Look forward to hearing how you like it compared to old settings on the track Friday.
Where'd you have do the corner balance/alignment and dyno runs done in this area?
TruLine - Bellevue
Based on research here form similar RWD converts:
Car: Porsche 996 Carrera 4S
Notes: Recently converted from AWD to RWD since last Tru-Line (Seattle) Corner Balance
Use: Strictly to and from the Track
Driver Weight: 185
Suspension:
KW V3 Coilovers (400 lb springs Front/ 680 lbs rear)
Tarret Solid Camber Plates Front & Rear
Polyurethane Bushings in Thrust Arms Front/Rear
New Stock Lower Control Arms
Adjustable Toe/Caster Arms
H&R Front & Rear Sway Bars
Tarret Endlinks
Note: Rear Right Toe Link is slightly bent
Desired Settings:
Front:
Camber -2.5 – 2.56
Caster 7.5 – 7.56
Toe OUT -1/32in (-0.79mm)
Total Toe -1/16in (-1.58mm)
Steer Ahead = 0.00
Sway Bar: Softest
Ride Height: 4.5”
Rear:
Camber -2.25 – 2.3
Toe IN 1/32in (0.79mm)
Total Toe 1/16in (1.58mm)
Thrust Ahead = -0.03
So that weight is rwd @ 3422 lbs with you in it and full tank of gas?
My Turbo corner weight, haven't got it balanced I just got it weight to see what they were. This is no driver, awd with full tank, all fluids, stock wheels, comfy sport seats, but with spare tire/tools and rear seats removed.
Seems my front is way off from one side to the other, but I was thinking it was due to no driver. Is it possible it would even out with driver or would it become worse?
FL: 679 FR: 592
RL: 1035 RR: 1079
Total 3385
So that weight is rwd @ 3422 lbs with you in it and full tank of gas?
My Turbo corner weight, haven't got it balanced I just got it weight to see what they were. This is no driver, awd with full tank, all fluids, stock wheels, comfy sport seats, but with spare tire/tools and rear seats removed.
Seems my front is way off from one side to the other, but I was thinking it was due to no driver. Is it possible it would even out with driver or would it become worse?
FL: 679 FR: 592
RL: 1035 RR: 1079
Total 3385
The corner balance includes 185 lbs (me) in the drivers seat.
Full tank, half roll cage, seats, etc.
Interesting numbers. With how stiff the chassis is I really can't comment on whether it would balance out or not but I do highly recommend corner balancing. The car is night and day better
So that weight is rwd @ 3422 lbs with you in it and full tank of gas?
My Turbo corner weight, haven't got it balanced I just got it weight to see what they were. This is no driver, awd with full tank, all fluids, stock wheels, comfy sport seats, but with spare tire/tools and rear seats removed.
Seems my front is way off from one side to the other, but I was thinking it was due to no driver. Is it possible it would even out with driver or would it become worse?
FL: 679 FR: 592
RL: 1035 RR: 1079
Total 3385
Your total weight is about right accounting for the removal of the spare wheel and rear seats. Stock 996TT is normally 3450-3500lbs. Your cross weight is off by 131lbs. Porsche specs the limit at 20kg, or 44lbs. on a GT2/3. Added driver balast may change that a little but not much.
For comparison, my cross weight with driver is 12lbs. My car with full fuel and no driver is 3198.
Last edited by powdrhound; 08-05-2016 at 09:41 AM.
Thanks seems it's in need of a corner balance then. Does height effect corner balance. Just wondering if it is done if all the corner height come out differently?
Here's some track video from Friday's PCANW day at the Ridge:
Car was aligned, lowered and corner balanced at TruLine Bellevue to the GT2 Specs with new NT01s.
The car responded brilliantly but was a handful. Took an entire day to get the line dialed as the car favored much more oversteer versus the predictable throttle and push thru apex that existed with the previous alignment. Slow in fast out matters much more now as throttle application mid-turn requires much more finesse than before. Turn in was much improved. Entry, Mid, Exit speeds are all relatively the same but the car is much more lively.
I dig it and will need a few more days to adjust. Lap times we're similar 1:55s-1:56 on new NT01s that weren't broken in. They should drop a few ticks as I acclimate and they break in.
Anyway, here's the final session's video chasing a few instructors and my buddy in his 930 Turbo.
RWD is amazing. Been daily driving through the winter and the car has been awesome. Added a few more go fast parts and maintenance items ahead of the upcoming track season.