Bimmerpost for Android has just been updated to version 4.3.55 with a host of bug fixes. Try it out!
ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   ZPOST > BMW Z4 Technical Talk > Track / Autocross / Dragstrip / Driving Techniques
  TireRack

SUPPORT ZPOST BY DOING YOUR TIRERACK SHOPPING FROM THIS BANNER, THANKS!
Post Reply
 
Thread Tools Search this Thread
      06-13-2012, 10:09 PM   #1
gmd2003
Colonel
gmd2003's Avatar
281
Rep
2,133
Posts

Drives: 2014 CP M6 and 2006 VT 525 Z4M
Join Date: May 2012
Location: South Carolina

iTrader: (2)

ESVt-1 Z4M at PCA DE Roebling Road 6/9/12

Some of the more open laps of the day in the PCA white group at Roebling. Trying out a new camera angle, works well can even see my speed on my AIM solo. [u2b]
[/u2b]
Appreciate 0
      06-13-2012, 10:46 PM   #2
mfanatic325
///M-fanatic
mfanatic325's Avatar
Taiwan
149
Rep
3,881
Posts

Drives: '01 911 Turbo
Join Date: Oct 2007
Location: Cupertino, CA.

iTrader: (23)

Looks like a fun track.

OT, but is that how we're supposed to use the thumb buttons on the steering wheel? For my car, I've always wrapped my thumbs around the corner

I think the only times I use thumb buttons are for go-karts hah.
Appreciate 0
      06-13-2012, 11:09 PM   #3
gmd2003
Colonel
gmd2003's Avatar
281
Rep
2,133
Posts

Drives: 2014 CP M6 and 2006 VT 525 Z4M
Join Date: May 2012
Location: South Carolina

iTrader: (2)

It lets me get a better feel for what the car is doing through the wheel feedback that i lose if i'm putting a death grip on the wheel. Just my way of keeping things loose.
Appreciate 0
      06-14-2012, 07:14 AM   #4
Mirko
Captain
Mirko's Avatar
Canada
144
Rep
987
Posts

Drives: E86 Z4M, E90 328i, E84 X1
Join Date: Apr 2011
Location: Toronto

iTrader: (2)

What settings do you have your KW's set at for track and how did they perform?
Appreciate 0
      06-14-2012, 08:48 AM   #5
onelove
Track Head
onelove's Avatar
United_States
14
Rep
503
Posts

Drives: 07 Z4M
Join Date: Jan 2008
Location: Orlando,FL

iTrader: (0)

GMD - great laps, what lap times were you turning this go around ? I can see a few areas from the video where you can likely pick up significant time, unfortunately most of the data I have from my Z4M is in Traqmate and not the AIM Solo I recently switched to. I believe I'm back up there in August with Flat out and again in October with the PCA Citrus club who I instruct with, would love to ride shotgunf or a few laps.

Quote:
Originally Posted by mfanatic325 View Post
Looks like a fun track.

OT, but is that how we're supposed to use the thumb buttons on the steering wheel? For my car, I've always wrapped my thumbs around the corner

I think the only times I use thumb buttons are for go-karts hah.
Typically you don't want to wrap your thumbs around the steering wheel at a track. In the even of contact of a severe loss of control it can break your thumbs when the steering wheel spins rapidly (This is also in essence why if you watch indy car the second they go into a spin they take their hands completely off the wheel).
__________________
2004 Porsche GT3 |White
HRE R40 Monoblocks | KW Clubsport Suspension | RSS Lower Control Arms and Suspension Links | GT3RS Wing and Front Bumper | Cup Car Lip | Euro GT3 Seat | GMG Half Cage | Europipe Exhaust | EPL Tuning
Appreciate 0
      06-14-2012, 08:51 AM   #6
S54dan
I no longer work for United BMW!
S54dan's Avatar
179
Rep
3,330
Posts

Drives: E46 M3, E46 330i ZHP, E36 325i
Join Date: Jan 2008
Location: Atlanta, GA

iTrader: (36)

Garage List
1994 BMW 325i  [4.25]
2005 M3  [4.83]
2005 325i  [4.00]
2003 330i ZHP  [4.50]
Your car looked good out there. We had fun too. Hope to see you again in the future
__________________
BMW CCA, PCA, & CHIN Motorsports Instructor.
Appreciate 0
      06-14-2012, 09:09 AM   #7
gmd2003
Colonel
gmd2003's Avatar
281
Rep
2,133
Posts

Drives: 2014 CP M6 and 2006 VT 525 Z4M
Join Date: May 2012
Location: South Carolina

iTrader: (2)

Thanks I was running 1:27 consistently my best lap was 1:25, yeah I know I'm leaving a ton of time on the table in 1 and 3 and 9 , but I had a bad spin happened in 3 so I'm still overly careful there (100 mph sideways is not fun). I am coasting into 1 too much as well need to stay on the gas longer, but at 140 plus it's been messing up my turn in to 1 when i brake later. Just need more repetitions only been doing this for a year.
Appreciate 0
      06-14-2012, 09:10 AM   #8
gmd2003
Colonel
gmd2003's Avatar
281
Rep
2,133
Posts

Drives: 2014 CP M6 and 2006 VT 525 Z4M
Join Date: May 2012
Location: South Carolina

iTrader: (2)

Thanks! It was nice meeting you as well.
Appreciate 0
      06-14-2012, 09:45 AM   #9
gmd2003
Colonel
gmd2003's Avatar
281
Rep
2,133
Posts

Drives: 2014 CP M6 and 2006 VT 525 Z4M
Join Date: May 2012
Location: South Carolina

iTrader: (2)

Quote:
Originally Posted by Mirko View Post
What settings do you have your KW's set at for track and how did they perform?
They definetly keep the car planted and flat way better than stock, i was seeing peak lateral G in the 1.1 range on street tires although very sticky street tire (Re-11's). I am still utilizing them on 6/10 rebound and compression up front and 5/10 in the rear. I have been dialing in proper camber set up and won't make any changes in suspension settings until I'm maximizing my current setup, i.e within .1 seconds of my fastest lap every time. I think the KW 3 are a fantastic value for what you get.
Appreciate 0
      06-14-2012, 10:34 AM   #10
onelove
Track Head
onelove's Avatar
United_States
14
Rep
503
Posts

Drives: 07 Z4M
Join Date: Jan 2008
Location: Orlando,FL

iTrader: (0)

Quote:
Originally Posted by gmd2003 View Post
Thanks I was running 1:27 consistently my best lap was 1:25, yeah I know I'm leaving a ton of time on the table in 1 and 3 and 9 , but I had a bad spin happened in 3 so I'm still overly careful there (100 mph sideways is not fun). I am coasting into 1 too much as well need to stay on the gas longer, but at 140 plus it's been messing up my turn in to 1 when i brake later. Just need more repetitions only been doing this for a year.
1 definitely need to lay into it all the way to the markers, then hard brake. In my Z I was actually down shifting to 3rd once I hit the first apex which allowed me to get to power earlier on the exit of the 2nd part of the turn and rotate the car. This may be different with your gearing.

Trick to 3 is to turn in much earlier and hug the inside of the turn there. The pavement is shaped like a /\ from when they paved it, you can load the car up on the inside and get to full throttle for a second going into your brake/downshift. If you spun there it's likely from being a bit too wide and getting the off camber side where there is a ton of marbles. More grip on the inside will also let you get to throttle from 2-3 more, but still will want a lift to settle the car.

Another trick to Roebling for the wallet, make sure you're swapping your tires right to left at the end of each day.
__________________
2004 Porsche GT3 |White
HRE R40 Monoblocks | KW Clubsport Suspension | RSS Lower Control Arms and Suspension Links | GT3RS Wing and Front Bumper | Cup Car Lip | Euro GT3 Seat | GMG Half Cage | Europipe Exhaust | EPL Tuning
Appreciate 0
      06-14-2012, 10:51 AM   #11
Mirko
Captain
Mirko's Avatar
Canada
144
Rep
987
Posts

Drives: E86 Z4M, E90 328i, E84 X1
Join Date: Apr 2011
Location: Toronto

iTrader: (2)

Quote:
Originally Posted by gmd2003 View Post
They definetly keep the car planted and flat way better than stock, i was seeing peak lateral G in the 1.1 range on street tires although very sticky street tire (Re-11's). I am still utilizing them on 6/10 rebound and compression up front and 5/10 in the rear. I have been dialing in proper camber set up and won't make any changes in suspension settings until I'm maximizing my current setup, i.e within .1 seconds of my fastest lap every time. I think the KW 3 are a fantastic value for what you get.
I am running 9 compression front, 11 rear and middle setting for rebound all around and honestly don't want to change it. Car is fairly flat but does like a little oversteer (which I like) on entry if I give it a little too much mustard.

On warmer days do you find they make the whoosh sound of the shocks compressing?

Have read great things about the RE-11's but I already picked up Michelin super sports which grip nicely. Will try the RE's next time though.
Appreciate 0
      06-14-2012, 12:43 PM   #12
gmd2003
Colonel
gmd2003's Avatar
281
Rep
2,133
Posts

Drives: 2014 CP M6 and 2006 VT 525 Z4M
Join Date: May 2012
Location: South Carolina

iTrader: (2)

Quote:
Originally Posted by onelove View Post
1 definitely need to lay into it all the way to the markers, then hard brake. In my Z I was actually down shifting to 3rd once I hit the first apex which allowed me to get to power earlier on the exit of the 2nd part of the turn and rotate the car. This may be different with your gearing.

Trick to 3 is to turn in much earlier and hug the inside of the turn there. The pavement is shaped like a /\ from when they paved it, you can load the car up on the inside and get to full throttle for a second going into your brake/downshift. If you spun there it's likely from being a bit too wide and getting the off camber side where there is a ton of marbles. More grip on the inside will also let you get to throttle from 2-3 more, but still will want a lift to settle the car.

Another trick to Roebling for the wallet, make sure you're swapping your tires right to left at the end of each day.
Staying on til the markers puts me at 150 GPS speed b/c of the supercharger but with my brakes theres no reason i cant do that. Yeah with the 4.10's and the extra power from the supercharger 4th gear is all i need, I actually run out of gear mid turn coming out of two if i downshift. the only place i can still use third is turn 5 and 6 but its def not necessary tons of torque to rotate the car in 4th with my setup. dynoing 390/300 at the wheels. I agree with 3 as well came in faster than usual b/c i got 2 right and went wide and spun bc of camber and marbles. What speed did you turn into 3? I'm hitting mid 90's coming out of 2 then slowing down to low 80's for turn in.
Ha def right about swapping tires it eats up the left side
Appreciate 0
      06-14-2012, 02:01 PM   #13
gmd2003
Colonel
gmd2003's Avatar
281
Rep
2,133
Posts

Drives: 2014 CP M6 and 2006 VT 525 Z4M
Join Date: May 2012
Location: South Carolina

iTrader: (2)

Quote:
Originally Posted by Mirko View Post
I am running 9 compression front, 11 rear and middle setting for rebound all around and honestly don't want to change it. Car is fairly flat but does like a little oversteer (which I like) on entry if I give it a little too much mustard.

On warmer days do you find they make the whoosh sound of the shocks compressing?

Have read great things about the RE-11's but I already picked up Michelin super sports which grip nicely. Will try the RE's next time though.
Haven't noticed the whoosh , but then again between the blower , engine ,headers and exhaust i don't hear much else
The PSS are good in fact I like their feel on turn in, better than the RE-11's but they don't have the absolute grip nor the heat tolerance of the RE-11's thats why I switched.
Appreciate 0
      06-14-2012, 02:06 PM   #14
gmd2003
Colonel
gmd2003's Avatar
281
Rep
2,133
Posts

Drives: 2014 CP M6 and 2006 VT 525 Z4M
Join Date: May 2012
Location: South Carolina

iTrader: (2)

[quote=onelove;12152992]GMD - great laps, what lap times were you turning this go around ? I can see a few areas from the video where you can likely pick up significant time, unfortunately most of the data I have from my Z4M is in Traqmate and not the AIM Solo I recently switched to. I believe I'm back up there in August with Flat out and again in October with the PCA Citrus club who I instruct with, would love to ride shotgunf or a few laps.


I will be there in August with Flat out too. Shame you sold your M I was looking forward to some lead /follow. I've never run with that group before how is it? Was wondering what run group I should sign up for,intermediate? Looking forward to meeting you and any tips would be appreciated.
G
Appreciate 0
      06-15-2012, 10:15 AM   #15
onelove
Track Head
onelove's Avatar
United_States
14
Rep
503
Posts

Drives: 07 Z4M
Join Date: Jan 2008
Location: Orlando,FL

iTrader: (0)

Flat out is a great group, a few of my friends started it after not getting enough track time with other groups. This is there second event at Roebling and the first went without a hitch. I'd sign up in Intermediate. Advanced last time was cars running 1:16-1:21 and dominated by GTRs, GT3s, etc.

Looking at some old data from a 1:22 Lap I had on my work computer, I'm entering 9 at 95mph and end up at 138 braking into 1. By the mid-point between 1 and 2 I'm at 68mph. Turn 3 I was able to carry 94mph through the turn.

I love tracking the Z4M but was at a slippery slope. No one that I ran with at the time used them so I was in a world of my own trying to get data, etc. Many of my friends run GT3 and GT3RS so it was either spend 10-15k on a supercharger,cage, seats and harnesses, or sell the car and get a GT3. Safety was also a huge concern since we run tracks like Sebring and Daytona as well, and the GT3 offered a bolt-in cage vs having to cut half the car appart like the Z4M. I still miss the car quite a bit!
__________________
2004 Porsche GT3 |White
HRE R40 Monoblocks | KW Clubsport Suspension | RSS Lower Control Arms and Suspension Links | GT3RS Wing and Front Bumper | Cup Car Lip | Euro GT3 Seat | GMG Half Cage | Europipe Exhaust | EPL Tuning
Appreciate 0
      06-15-2012, 02:16 PM   #16
gmd2003
Colonel
gmd2003's Avatar
281
Rep
2,133
Posts

Drives: 2014 CP M6 and 2006 VT 525 Z4M
Join Date: May 2012
Location: South Carolina

iTrader: (2)

Quote:
Originally Posted by onelove View Post
Flat out is a great group, a few of my friends started it after not getting enough track time with other groups. This is there second event at Roebling and the first went without a hitch. I'd sign up in Intermediate. Advanced last time was cars running 1:16-1:21 and dominated by GTRs, GT3s, etc.

Looking at some old data from a 1:22 Lap I had on my work computer, I'm entering 9 at 95mph and end up at 138 braking into 1. By the mid-point between 1 and 2 I'm at 68mph. Turn 3 I was able to carry 94mph through the turn.

I love tracking the Z4M but was at a slippery slope. No one that I ran with at the time used them so I was in a world of my own trying to get data, etc. Many of my friends run GT3 and GT3RS so it was either spend 10-15k on a supercharger,cage, seats and harnesses, or sell the car and get a GT3. Safety was also a huge concern since we run tracks like Sebring and Daytona as well, and the GT3 offered a bolt-in cage vs having to cut half the car appart like the Z4M. I still miss the car quite a bit!
Cool I figured I should be able to do 90 with the RE-11's I have been doing 85 going into 9. My minimum in 2 is consistently 64 so thats not bad , but as I figured you are killing me in 3 by 8mph. What front/rear alignment settings (camber/toe) did you settle on? I'm at -2.5 .03 toe in front and -2 rear . Figure i'll end up finding that -3.5 is needed up front going by my tire temps last time
Thanks!
GJ
Appreciate 0
      06-15-2012, 02:59 PM   #17
onelove
Track Head
onelove's Avatar
United_States
14
Rep
503
Posts

Drives: 07 Z4M
Join Date: Jan 2008
Location: Orlando,FL

iTrader: (0)

From memory I had -4.0 in the front with 0 toe (which I also used on the street and got decent tire wear), rear I believe was -2 camber, can't find my notes to know 100%.
__________________
2004 Porsche GT3 |White
HRE R40 Monoblocks | KW Clubsport Suspension | RSS Lower Control Arms and Suspension Links | GT3RS Wing and Front Bumper | Cup Car Lip | Euro GT3 Seat | GMG Half Cage | Europipe Exhaust | EPL Tuning
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 04:55 AM.




zpost
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST