Update: 996spacers on the 997 & stock corner balance weights
04-10-2007, 09:33 PM
#1
Drifting
Thread Starter
Update: 996spacers on the 997 & stock corner balance weights
- had the car in the shop today to finally get the proper track allignment
- I originally tried to get the track allignment at the dealer (mistake) they were able to get the rear specs but not front (calls for -2degrees camber in the front - they were only able to get -1.7 and then refused to install spacers as they were not a stock 997GT3 part)
- I then did one track event at Limerock with the dealer's version of track allignment ( -1.7 front, -2.4 rear) + added full wing = car was stable
- before the shop today did any changes with the shims they gave me the current readout - it was:
front = -1.8 (both)
rear = left (-2.7) right (-2.4)
- shows you how quickly allignments can go out - but I also suspect it shows you that the springs have settled "a little" and added a tiny bit of camber all around (apparently not to the rear right)
- I ordered 1mm, 2mm, and 3mm Porsche 996GT# spacers (997GT3 spacers do not exist in the database)
- the Porsche US distribution center decided to deliver 1mm, 2mm and 2mm (guy was either drinking, blind, or they didn't have 3mm)
- at the shop today, owner came out after they did the initial read on the allignment at -1.8 and said that putting in a 2mm spacer brought the allignment to -2.1 from -1.8
- for those that want to get the "track settings", a 2mm spacer is approx. -.3 degrees - so 1mm = -1.5degrees approx.
- given that the car comes with the street setting of -1.4 (in front if I remember correctly) and given -.6 has to be added for the track allignment all you have to do is order 2 2mm shims for each side if you want to "home brew" a track solution when you arrive at the track
- otherwise, just order 1 2mm 996GT3 shim per side and this will be enough to get you to the track allignment specs in the front
Corner Weights
- My car has the following changes from the stock car
1) 996GT3 seats (lighter)
2) a 55# rollbar installed (heavier)
3) 5 point harnesses, sub mount, fire extinguisher and mount (approx 10#)
4) car has pccbs
5) car had 1/4 tank of gas (27# i believe)
The 55# rollbar + 10# other = approx 65#
Car's weight today with 1/4 tank of gas (27#) was 3195#
3195# - 65# = 3130# with 1/4 tank of gas with 996GT3 seats in the car - so if anyone wants to get to #3100 for an autocross event, just put in 996seats and a light weight battery and you are there if you have pccbs - add some lightweight 18" wheels (I am definitely going to do this as 19" MPSCs are a crazy price + I would also like to get a better gearing for the track) and you can be at 3050#
Here are the corner weights that I got from my car today - I have not adjusted any ride height - 996GT3 seats + 55# rollbar + 10# other + 1/4 tank of gas:
Left Front = 551# , Right Front = 609#, Total Front = 1160#
Left Rear = 1058#, Right Rear = 976#, Total Rear = 2035#
Front = 1160#, Rear = 2035# (36%, 63%)
Left Side = 1609#, Right Side = 1585# (50%, 50%)
For those that want to do a lot of tracking and don't really need to get up a driveway, it would seem that you can pretty easily lower the front by 1/2" to 1" and likely get a nice 40%/60% front/ rear weight split or better
- I originally tried to get the track allignment at the dealer (mistake) they were able to get the rear specs but not front (calls for -2degrees camber in the front - they were only able to get -1.7 and then refused to install spacers as they were not a stock 997GT3 part)
- I then did one track event at Limerock with the dealer's version of track allignment ( -1.7 front, -2.4 rear) + added full wing = car was stable
- before the shop today did any changes with the shims they gave me the current readout - it was:
front = -1.8 (both)
rear = left (-2.7) right (-2.4)
- shows you how quickly allignments can go out - but I also suspect it shows you that the springs have settled "a little" and added a tiny bit of camber all around (apparently not to the rear right)
- I ordered 1mm, 2mm, and 3mm Porsche 996GT# spacers (997GT3 spacers do not exist in the database)
- the Porsche US distribution center decided to deliver 1mm, 2mm and 2mm (guy was either drinking, blind, or they didn't have 3mm)
- at the shop today, owner came out after they did the initial read on the allignment at -1.8 and said that putting in a 2mm spacer brought the allignment to -2.1 from -1.8
- for those that want to get the "track settings", a 2mm spacer is approx. -.3 degrees - so 1mm = -1.5degrees approx.
- given that the car comes with the street setting of -1.4 (in front if I remember correctly) and given -.6 has to be added for the track allignment all you have to do is order 2 2mm shims for each side if you want to "home brew" a track solution when you arrive at the track
- otherwise, just order 1 2mm 996GT3 shim per side and this will be enough to get you to the track allignment specs in the front
Corner Weights
- My car has the following changes from the stock car
1) 996GT3 seats (lighter)
2) a 55# rollbar installed (heavier)
3) 5 point harnesses, sub mount, fire extinguisher and mount (approx 10#)
4) car has pccbs
5) car had 1/4 tank of gas (27# i believe)
The 55# rollbar + 10# other = approx 65#
Car's weight today with 1/4 tank of gas (27#) was 3195#
3195# - 65# = 3130# with 1/4 tank of gas with 996GT3 seats in the car - so if anyone wants to get to #3100 for an autocross event, just put in 996seats and a light weight battery and you are there if you have pccbs - add some lightweight 18" wheels (I am definitely going to do this as 19" MPSCs are a crazy price + I would also like to get a better gearing for the track) and you can be at 3050#
Here are the corner weights that I got from my car today - I have not adjusted any ride height - 996GT3 seats + 55# rollbar + 10# other + 1/4 tank of gas:
Left Front = 551# , Right Front = 609#, Total Front = 1160#
Left Rear = 1058#, Right Rear = 976#, Total Rear = 2035#
Front = 1160#, Rear = 2035# (36%, 63%)
Left Side = 1609#, Right Side = 1585# (50%, 50%)
For those that want to do a lot of tracking and don't really need to get up a driveway, it would seem that you can pretty easily lower the front by 1/2" to 1" and likely get a nice 40%/60% front/ rear weight split or better
Last edited by 997gt3north; 04-10-2007 at 11:17 PM.
04-11-2007, 11:26 AM
#5
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Join Date: Nov 2006
Location: Long Island, New York
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Brilliant write-up, outstanding info! thanks!!
Perfect timing as well, my car was just dropped off for a full alignment about 30 minutes ago. I forwarded your info to them. I am shooting for -2.75 camber all around, 1/16" toe out in front, 1/16" toe in in the rear. Drop the car about 1", corner balance. They are also changing the motor mounts to solid today, so, I'll let everyone know how it goes!
Thanks again for your geometry info!
Perfect timing as well, my car was just dropped off for a full alignment about 30 minutes ago. I forwarded your info to them. I am shooting for -2.75 camber all around, 1/16" toe out in front, 1/16" toe in in the rear. Drop the car about 1", corner balance. They are also changing the motor mounts to solid today, so, I'll let everyone know how it goes!
Thanks again for your geometry info!
04-11-2007, 12:09 PM
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We'll see. From what I've been told, it should be pretty neutral, very aggressive, but pretty neutral. But either way, I'll find out for sure this weekend at Pocono and post my data. It's a starting point, so, after a weekend getting tire temp and pressure data, i'll readjust for Watkins Glen in May...