Shaping up a new-to-me 07 GT3
#167
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THANK YOU!!
I will look at it when I get off work.
I will look at it when I get off work.
__________________
PCA National Instructor
TPC Racing stats:
2023 Porsche Sprint Challenge 992 Cup Am Champion
2023 Porsche Sprint Challenge GT4 Pro-Am Team Champion
2022 Porsche Sprint Challenge 992 Cup & 991 Cup Champion
2020 IMSA GT3 Cup Challenge 2nd Championship
2018 IMSA GT3 Cup Challenge 2nd Championship
2016 IMSA GT3 Cup Challenge Champion
2013 IMSA GT3 Cup Challenge Champion
2006 Rolex-24 @ Daytona GT Champion
2004 Grand-Am SGS Class Champion
PCA National Instructor
TPC Racing stats:
2023 Porsche Sprint Challenge 992 Cup Am Champion
2023 Porsche Sprint Challenge GT4 Pro-Am Team Champion
2022 Porsche Sprint Challenge 992 Cup & 991 Cup Champion
2020 IMSA GT3 Cup Challenge 2nd Championship
2018 IMSA GT3 Cup Challenge 2nd Championship
2016 IMSA GT3 Cup Challenge Champion
2013 IMSA GT3 Cup Challenge Champion
2006 Rolex-24 @ Daytona GT Champion
2004 Grand-Am SGS Class Champion
#169
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Hey Tom,
I'm in the midst of calculating the spring lengths that I need for the new stiffer fronts, and I’m bouncing between two different choices. One choice will be just slightly short for the ride height I want to run and the spring will be a little loose in the seat (if I add a little bit of preload to seat it fully, the ride height will be too high). Not enough space for helpers on this choice. One size shorter will be really loose in the seats, but I really don’t want to run helper springs. On this shorter choice, I could either run a spring spacer or just add enough preload to get to the ride height that I want.
I noticed that you are running the genesis spring spacers and I wanted to get your thoughts on why you went this route as opposed to just adding preload to get the ride height that you wanted?
I'm in the midst of calculating the spring lengths that I need for the new stiffer fronts, and I’m bouncing between two different choices. One choice will be just slightly short for the ride height I want to run and the spring will be a little loose in the seat (if I add a little bit of preload to seat it fully, the ride height will be too high). Not enough space for helpers on this choice. One size shorter will be really loose in the seats, but I really don’t want to run helper springs. On this shorter choice, I could either run a spring spacer or just add enough preload to get to the ride height that I want.
I noticed that you are running the genesis spring spacers and I wanted to get your thoughts on why you went this route as opposed to just adding preload to get the ride height that you wanted?
#170
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Hey Tom,
I'm in the midst of calculating the spring lengths that I need for the new stiffer fronts, and I’m bouncing between two different choices. One choice will be just slightly short for the ride height I want to run and the spring will be a little loose in the seat (if I add a little bit of preload to seat it fully, the ride height will be too high). Not enough space for helpers on this choice. One size shorter will be really loose in the seats, but I really don’t want to run helper springs. On this shorter choice, I could either run a spring spacer or just add enough preload to get to the ride height that I want.
I noticed that you are running the genesis spring spacers and I wanted to get your thoughts on why you went this route as opposed to just adding preload to get the ride height that you wanted?
I'm in the midst of calculating the spring lengths that I need for the new stiffer fronts, and I’m bouncing between two different choices. One choice will be just slightly short for the ride height I want to run and the spring will be a little loose in the seat (if I add a little bit of preload to seat it fully, the ride height will be too high). Not enough space for helpers on this choice. One size shorter will be really loose in the seats, but I really don’t want to run helper springs. On this shorter choice, I could either run a spring spacer or just add enough preload to get to the ride height that I want.
I noticed that you are running the genesis spring spacers and I wanted to get your thoughts on why you went this route as opposed to just adding preload to get the ride height that you wanted?
It is my preference to use a single long spring in the front of a streetable car because it is made from longer length of spring wire to smooth the bumps better. Using a tender or helper spring on the front will "use up" the amount of available travel of a street car shock and forces the use of a shorter main spring which is made from less length of wire and will increase harness over bumps as a result. Race cars are completely different story.
I used 1" tall spacers in the rear only because I used the rear springs that came with the damptronic coilover kit. Those springs rates were close enough to what I wanted. The 1" spacers put those rear springs within 0.1" to its original specified height when used with my rear mount kit. Otherwise I would have to buy 1" longer rear springs or keep the same springs and lose 1" of shock travel.
#171
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Oh, and I am running a tender springs in the rear. The tender springs came with the damptronic kit. The rear shock bodies are threaded most of its length to accommodate reasonably long main springs AND tenders. The ride is pretty comfy for 700-ish rear springs!
#172
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To me, it is perfectly acceptable to have no preload, or what you are referring to as loose spring when the front shock is on full droop. If you are lifting a wheel on track the droop is a good amount less than lifting the entire car because the front bar limits the droop of the inside front corner suspension when the outside is loaded. You must make sure the spring is the proper matching ID for the perch and hat. If you are using 60mm ID metric springs then no problem. If you are using 2.25" ID spring then you need to change the hat & perch to match.
It is my preference to use a single long spring in the front of a streetable car because it is made from longer length of spring wire to smooth the bumps better. Using a tender or helper spring on the front will "use up" the amount of available travel of a street car shock and forces the use of a shorter main spring which is made from less length of wire and will increase harness over bumps as a result. Race cars are completely different story.
I used 1" tall spacers in the rear only because I used the rear springs that came with the damptronic coilover kit. Those springs rates were close enough to what I wanted. The 1" spacers put those rear springs within 0.1" to its original specified height when used with my rear mount kit. Otherwise I would have to buy 1" longer rear springs or keep the same springs and lose 1" of shock travel.
It is my preference to use a single long spring in the front of a streetable car because it is made from longer length of spring wire to smooth the bumps better. Using a tender or helper spring on the front will "use up" the amount of available travel of a street car shock and forces the use of a shorter main spring which is made from less length of wire and will increase harness over bumps as a result. Race cars are completely different story.
I used 1" tall spacers in the rear only because I used the rear springs that came with the damptronic coilover kit. Those springs rates were close enough to what I wanted. The 1" spacers put those rear springs within 0.1" to its original specified height when used with my rear mount kit. Otherwise I would have to buy 1" longer rear springs or keep the same springs and lose 1" of shock travel.
I believe I used 8" or 9" on both ends...or one of those combinations. Worked great, and the ride was better than expected for stiffer rates.
My current shock setup came with 8" length main springs (front and rear) with no helpers/tenders at all, for the exact same reasons you've mentioned regarding quality of ride and performance for a street/track car.
Your insight has been spot on and very informative, keep it coming!
#173
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Just received the first batch of 3-axis accelerometers. I am excited to install the first one on my car! Unfortunately I can't do it until next week because the shop is busy preparing for the IMSA race at Watkins Glen. For now, just wanted to share my excitement. Oh, and Mike Levitas made a special DSC box for doing shock dyno demo. Exciting stuff to come!
#174
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This DSC "test" box produces the output signals to simulate real road/track reaction from a PASM damper(shock).
#175
Just received the first batch of 3-axis accelerometers. I am excited to install the first one on my car! Unfortunately I can't do it until next week because the shop is busy preparing for the IMSA race at Watkins Glen. For now, just wanted to share my excitement. Oh, and Mike Levitas made a special DSC box for doing shock dyno demo. Exciting stuff to come!
#177
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Will do as soon as they are tested and confirmed to work as expected. You'll have to send in your DSC box because each accelerometer must be zero'ed and sync'ed to each box. And we'll install the latest software.
Last edited by Tom@TPC Racing; 06-25-2014 at 09:22 AM. Reason: spelling
#178
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