Need GXP track benchmark! - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 09-06-2004, 04:19 PM   #1
Junior Member
Posts like a Ricer Type-R
Thread Starter
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default Need GXP track benchmark!

We need someone with a GXP to hit a local dragstrip. We could really use a benchmark for comparison to the other Bonnevilles and other GXP'*.

Any GXP owners up to the task?
willwren is offline   Reply With Quote
Old 09-06-2004, 11:55 PM   #2
Senior Member
True Car Nut
 
Join Date: Jul 2003
Location: Westerville, Ohio 2000 Black SSEi
Posts: 6,127
Thanks: 0
Thanked 0 Times in 0 Posts
Rogue is on a distinguished road
Default

I have seen 2 run at the tracks, low 15'* for both. TM played a part in both. ANY wheel spin off the line = bad run. I talked to one guy after his runs and told him about removing the WSS in the front. I think he posted here that he picked up quite a bit of oomph off the line with them removed.
Rogue is offline   Reply With Quote
Old 09-07-2004, 10:37 AM   #3
Member
Posts like a V-Tak
 
Join Date: Jun 2004
Location: Wood River, IL
Posts: 66
Thanks: 0
Thanked 0 Times in 0 Posts
sahensley is on a distinguished road
Default

What is the WSS?
sahensley is offline   Reply With Quote
Old 09-07-2004, 10:38 AM   #4
Senior Member
True Car Nut
 
Join Date: Oct 2003
Location: Pittsburgh, Pa.
Posts: 7,551
Thanks: 0
Thanked 0 Times in 0 Posts
SSsuperchargedEi is on a distinguished road
Default

WSS = Wheel Speed Sensor
SSsuperchargedEi is offline   Reply With Quote
Old 09-07-2004, 11:25 AM   #5
Senior Member
Posts like a 4 Banger
 
Join Date: Feb 2004
Posts: 100
Thanks: 0
Thanked 0 Times in 0 Posts
5.3Avalanche is on a distinguished road
Default

Quote:
Originally Posted by SSsuperchargedEi
WSS = Wheel Speed Sensor
Are you talking about traction control, stabilitrac, or something having to do with the front diff?
5.3Avalanche is offline   Reply With Quote
Old 09-07-2004, 11:32 AM   #6
Senior Member
True Car Nut
 
Join Date: Oct 2003
Location: Pittsburgh, Pa.
Posts: 7,551
Thanks: 0
Thanked 0 Times in 0 Posts
SSsuperchargedEi is on a distinguished road
Default

Quote:
Originally Posted by Rogue
Your WSS are in the middle of your front wheel hubs. If you look behind the tire you should see an electrical conenction in the middle. Just pop it off and let it hang out of the way. Do this on both sides. This will disable your ABS, and traction control so be sure to hook em back up when you leave the track. You will probably spin a lot more off the line so youll need to get used to it...(Right Allmachtige?)
SSsuperchargedEi is offline   Reply With Quote
Old 09-07-2004, 11:35 AM   #7
Senior Member
Expert Gearhead
 
Join Date: Dec 2002
Location: Mississauga, Ontario
Posts: 20,892
Thanks: 0
Thanked 1 Time in 1 Post
Jim W is on a distinguished road
Default

If you take off your front tires you will see a wire/sensor electrical line, its the wiring to the WSS, disconnect it and your ABC/TC is bypassed.

The Northstar doesnt have the low end tq that the 3800 has, I'd be more concerned about wheel on the roll...

*edit* right, thanks Ryan
Jim W is offline   Reply With Quote
Old 09-07-2004, 11:38 AM   #8
Senior Member
True Car Nut
 
Join Date: Jul 2003
Location: Westerville, Ohio 2000 Black SSEi
Posts: 6,127
Thanks: 0
Thanked 0 Times in 0 Posts
Rogue is on a distinguished road
Default

The PCM gets data about your tires spinning from the front wheel speed sensors. This is how it knows when to engage ABS, or certain Stabilitrak traction control algorithms. When they are not connected, the TS system shuts down and you get an error in the DIC saying service stabilitrak system. Also your ABS and Traction control lights should come on. They will go away once you hook them back up.

When you spin the tires agressively such as on a launch the car will immediately pull timing and enable active braking to get the car under what it thinks is control. This will, of course, adversely affect your 1/4 mile time. By disconnecting them you remove the PCM'* ability to do this.

There is still plenty of other ways the PCM will enable torque management but until you start modding the car I don' think you will trip them (certain amount or Torque exceeded in certain gears, etc...)
Rogue is offline   Reply With Quote
Old 09-08-2004, 11:18 PM   #9
Member
Posts like a V-Tak
 
Join Date: Sep 2004
Posts: 35
Thanks: 0
Thanked 0 Times in 0 Posts
blacksedan is on a distinguished road
Default

I ran mine at the local track (KCIR) June 30 with only a few hundred miles on the odo. All times were 15.52 to 15.62 @ 89-90 mph. Short times were high 2.3'* with or without TC engaged with very little wheelspin.

KCIR is notorious for being .2 to .3 slower than your "average" track. I moved to the GXP from a moderately modded GTP -- 13.25 @ 106 mph , 2.0x 60 ft times -- TOG'*, rockers, PCM, 3.1 pulley, etc..... I've logged well over 100 1/4-mile passes in a FWD sedan, so I feel pretty confident in my launch technique.

I will unplug the WSS next time out and see what I get. I'm betting the torque management in the PCM is ridiculous. I hope INTENSE or one of the PCM programmers will get something out to us soon!!
blacksedan is offline   Reply With Quote
Old 09-08-2004, 11:25 PM   #10
Senior Member
Posts like a Corvette
 
Join Date: Jan 2004
Location: Montréal, QC
Posts: 1,374
Thanks: 0
Thanked 0 Times in 0 Posts
Foghorn is on a distinguished road
Default

Every succesive version of the Traction Control System has gotten a lot more sophisticated in the way it deals with reduced traction, I imagine the GXP is very proactive.

Man those Bonneville GXPs are beautiful cars

Cheers,
Foghorn is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Turbo GP GXP hits the track sonoma_zr2 Lounge 6 11-14-2007 11:19 PM
Saw a '02 or '03 Black SSEi @ the track Wednesday dbtk2 2000-2005 4 07-11-2003 12:12 AM
pics at the track when my egr blew open Performance, Brainstorming & Tuning 22 06-03-2003 02:09 AM
Broke in the '03 at the track today... Rotgut Performance, Brainstorming & Tuning 17 05-18-2003 02:56 AM
New division at race track. Wolfedog50 Performance, Brainstorming & Tuning 4 04-25-2003 12:38 PM


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:42 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.