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[BUILD] My Ultimate C7 Track Car - The C7 GS.R

 
Old 01-26-2019, 09:36 PM
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Subscribed. Curious to which tracks you have on the horizon for the GS.R? Daytona in early April with Flatout Motorsports/Celebration Exotic cars?
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Old 01-26-2019, 09:55 PM
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Old 01-26-2019, 10:14 PM
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Subíed

Curious as to your thoughts on running FE7 springs and sway bar bushings on an FE6 equipped GS but with the stock MRC shocks.

Also...Arenít the front springs the same on the GS...regardless of if itís a Z07 car? I thought the difference on the Z cars was to account for the added supercharger weight.

Last edited by 96GS#007; 01-26-2019 at 11:58 PM.
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Old 01-26-2019, 10:14 PM
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Sub'd. Not going to aftermarket bars? Does the DSC shocks and Z07 springs sufficiently limit roll? I found my non-mag Z51 had extreme bodyroll. Added AFE bars.
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Old 01-27-2019, 12:16 AM
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Sean, could you share the part numbers for the FE7 springs please? Iím really looking forward to reading the updates for this build. Thanks
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Old 01-27-2019, 08:29 AM
  #26  
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Originally Posted by Newton06 View Post
Any particular reason you are not going with a full coilover setup?
Do you mean a conventional coilover setup or with the Tractive shocks? I think the dynamic suspension provided by the DSC Sport controller even with the stock shocks is superior to any static setup. With the Tractive shocks it'll to be a whole other level. We talked about doing coilovers on the Tractive shocks since the shock bodies can accept a spring perch. However, there are some fitment issues that would require some fabrication and at this point we don't think it's necessary. The main advantage would be to be able to swap springs more easily but Mike is setting up a rig to measure several stock leaf spring rates so we'll have that data.

Originally Posted by US Icon View Post
Subscribed. Curious to which tracks you have on the horizon for the GS.R? Daytona in early April with Flatout Motorsports/Celebration Exotic cars?
I'm based out of the Mid-Atlantic and Summit Point is my home track but I also spend a lot of time at VIR. I plan to hit Watkins Glen at least once this year and would like to make my first trip to Mid Ohio and likely PittRace. I originally had planned on going to the NCM MSP in April but don't think I'll make that due to conflicts.

Originally Posted by 96GS#007 View Post
Curious as to your thoughts on running FE7 springs and sway bar bushings on an FE6 equipped GS but with the stock MRC shocks.

Also...Arenít the front springs the same on the GS...regardless of if itís a Z07 car? I thought the difference on the Z cars was to account for the added supercharger weight.
I don't know how well FE6 shocks would work with FE7 springs but at a minimum I'd suggest the DSC controller (starting to feel like a sales guy but it's true). My understanding is that the orifice size for the MR fluid in the FE7 shocks is smaller so it has a much tighter range. Whether you can put enough current in an FE6 shock to get that range I don't know.

Yes, my understanding is that the GS Z07 still uses the FE6 springs in front but I've had a hard time validating that through the online parts catalog. I'm putting the FE7 front spring in because I liked the better support it provided the front of the car under load and the weight difference is 95 lbs - admittedly it's almost all up front but that's not a huge amount. I do plan on some big aero (exact details TBD) so I figure I'll need the heavier spring to support that anyway. I'm interested to see the results of Mike's testing and in particular what the difference with the ZR1 front spring is.

Originally Posted by Tool Hoarder View Post
Sub'd. Not going to aftermarket bars? Does the DSC shocks and Z07 springs sufficiently limit roll? I found my non-mag Z51 had extreme bodyroll. Added AFE bars.
Not planning on it. I'd rather address the roll through springs and shocks.

Originally Posted by rico750sxi View Post
Sean, could you share the part numbers for the FE7 springs please? Iím really looking forward to reading the updates for this build. Thanks
I have a spreadsheet of all the various suspension part numbers I've been able to determine from the online catalog. I need to start another thread in C7 tech with that info but part numbers do change. Here is what I bought.
Front: 84144988
Rear: 23344290

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Old 01-27-2019, 09:14 AM
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Old 01-27-2019, 10:28 AM
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I love the color combo of the new GS.R! Not one you see very often.

Subd.
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Old 01-27-2019, 11:01 AM
  #29  
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Originally Posted by Bad_AX View Post
I love the color combo of the new GS.R! Not one you see very often.

Subd.
Apparently local guy Tommy Milner and I have similar tastes. I might need to add the red hash marks.


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Old 01-27-2019, 06:56 PM
  #30  
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Old 01-27-2019, 08:55 PM
  #31  
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Here's a couple more hopefully useful tidbits if you do this yourself. There are three types of fasteners in the suspension that are single use so you should buy new ones if you're going to tear the suspension apart like this:
  • Front sway bar bushing bolts: (4) 11546672
  • Front spring bracket bolts: (4) 3545602
  • Lower ball joint to spindle nut: (4) TBD (had to ask the dealer, will update when I get the part)
Also, the sway bar bushings have a dab of color on them to indicate which bushing they are. Here are the ones I know so far:
  • Pink: FE6 rear
  • Blue: FE7 rear
  • Green: FE6 front
  • Orange: FE7 front
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Old 01-27-2019, 09:04 PM
  #32  
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Originally Posted by Poor-sha View Post
Here's a couple more hopefully useful tidbits if you do this yourself. There are three types of fasteners in the suspension that are single use so you should buy new ones if you're going to tear the suspension apart like this:
  • Front sway bar bushing bolts: (4) 11546672
  • Front spring bracket bolts: (4) 3545602
  • Lower ball joint to spindle nut: (4) TBD (had to ask the dealer, will update when I get the part)
Also, the sway bar bushings have a dab of color on them to indicate which bushing they are. Here are the ones I know so far:
  • Pink: FE6 rear
  • Blue: FE7 rear
  • Green: FE6 front
  • Orange: FE7 front
Oops I missed "use new bolts only" on my springs when I did them. I bet it's just due to the dried up thread locker.
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Old 01-27-2019, 09:23 PM
  #33  
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Oh, one more thing. I was able to read the part numbers off the sway bars and the FE6 bars on the GS are the same as the FE7 Z06 bars.
Front: 20966781
Rear: 22936510
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Old 01-28-2019, 02:09 AM
  #34  
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cant wait to follow along on your journey!
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Old 01-28-2019, 02:54 AM
  #35  
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Originally Posted by BrunoTheMellow View Post
Oops I missed "use new bolts only" on my springs when I did them. I bet it's just due to the dried up thread locker.
Probably... unless you have to "degree" them after torquing, which effectively stretches the thread and makes it a one time use. Does make for a good excuse to buy a pretty new snap on TechAngle torque wrench. :-)
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Old 01-28-2019, 10:37 AM
  #36  
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FYI the OEM manuals contradict themselves on torque spec and process for the front bar bolts. In the spec sheet page at the front of the section it says 22lbs + 50 degrees. Then on the actual operation page it says torque to spec, lists 22+ 50 degrees at bottom of page, then says ensure a minimum of 37 ft/lbs has been achieved. That makes no sense for a TTY fastener and 37 is way high for a M8 coarse bolt even high grade like these are. I was doing mine and did 22 + 50 and went to go to 37 and the bolt stretched a ton more. Backed off clicked my wrench at 30 and marked the bolts and bought spares. The correct real spec is 22 lbs + 50 degrees... nothing more! Might save you a headache. Not the first blatant error I've seen in these C7 FSMs.

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Old 01-28-2019, 10:40 AM
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Originally Posted by BrunoTheMellow View Post
Oops I missed "use new bolts only" on my springs when I did them. I bet it's just due to the dried up thread locker.
Depends... I haven't touched springs, but I can confirm the front bar bolts are TTY stretch bolts. No clue why GM would use stretch bolts for these applications.

Last edited by Tool Hoarder; 01-28-2019 at 10:41 AM.
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Old 01-28-2019, 11:16 AM
  #38  
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Originally Posted by Tool Hoarder View Post

Depends... I haven't touched springs, but I can confirm the front bar bolts are TTY stretch bolts. No clue why GM would use stretch bolts for these applications.
What odd too is it's just the front. The rear springs and sway brackets aren't single use. I know the bolts are bigger for the sway brackets in the rear, I didn't check the spring bracket bolts.
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Old 01-28-2019, 12:47 PM
  #39  
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No bsing around. Looking forward to your adventure.
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Old 01-28-2019, 01:45 PM
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I've enjoyed your YT videos and look forward to your build!
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