Re: Vorshlag C5 Corvette Development Thread
continued from below
SCCA at Lone Star Park, July 30, 2016
Event pic and video gallery: https://vorshlag.smugmug.com/Racing-...-Park-July-30/
At this SCCA regional event Mark's Corvette had 3 drivers - Mark and Chase drove it in CAM-S while I jumped up to "X" class to run it in a different heat. And heat was the key word - it was 97°F during my runs and I forgot to bring my cooler - which led to heat exhaustion that day pretty badly (2 other people at this event went to the hospital that day, from the same effects). It hit me so hard that day that it has crept back and got me another 3 times this summer. I'm really trying to stay ahead of it by drinking lots of water and Gatorade type drinks, but heat is really killing me this year.

You can't see it as much in the in-car video below, but I was fighting the ABS system in all of the big braking zones once again. This run the ABS completely goes bonkers on me and I blew 30 feet off line. The GM ABS is really starting to spook me - I just cannot use the brakes as hard as I can in a Ford, BMW or Subaru. Frustrating.

The handling was much improved with proper rear compression valving set this time, and my raw time was pretty good on my 3rd run, but I clipped a damned cone again - just ran over the base. By my 4th and 5th runs my hands were shaking badly, I slowed down, and I knew I was in trouble with dehydration. That run heat took almost 2 hours and there was nowhere to hide from the relentless sun. By days end it was 104°F and I was close to throwing up. After the Corvette loaded in my trailer and I sat in the truck for 30 minutes with the AC on full blast, trying to regain control of my brain, with a pounding migraine from the heat exhaustion. I somehow got home, then drank a lot of water and passed out by 5 pm and slept for 14 hours. I felt terrible the next day, my whole body hurt. This was a bad day.

My results in the "X" class were marred by my 3rd run cone (4th and 5th runs are thrown out in "X"), so I was somewhere near the bottom of the class. Mark and Chase ran in CAM-S a later heat but were about a second behind my best clean run. The rear tires were really giving up the ghost that day. They have been racing the car every other week all summer on this set, ever since the ProSolo, and did a huge number of runs on the rear tires. After this event we all decided the rear's needed to get bigger, so talked about an 18x12" rear wheel and 335mm tire for the remainder of the season.
SCCA at TMS Bus Lot, August 28th, 2016

Event pic and video gallery: https://vorshlag.smugmug.com/Racing-...t-TMS-Bus-Lot/
This was last weekend's event, but the day before I was at Motorsport Ranch running baseline track times in my wife's 2013 FR-S. I got overheated and was feeling sick Saturday afternoon. On Sunday at the autocross I was already starting "behind" on my hydration, and heat exhaustion kicked my butt again on Sunday. This was getting ridiculous.

I made a point to bring a stocked cooler with waters and Gatorade drinks and kept one in my hand all day, drinking non stop, but the previous day's damage was just too much to un-do. It wasn't even that hot, only about 90°F when I left at 2 pm, but I was feeling it while driving. I hit a record 6 cones over 5 runs in Mark's car that day, fought ICE MODE on every run, and had arguably my worst drive of the year. Right before Nationals, yay...

This layout was what I call a "busy little Miata Course" - as are all of the courses at Texas Region events - but that's what we had to navigate in this car. Mark was ahead of me all day, and I just couldn't seem to get ahead enough on the courses or stay off the cones. I am not even showing my in-car video, its just awful. Mark, however, drove very well and put .425 seconds on me that day and pax'd top 20.

We both felt the recent changes (see below) of new swaybars and wider 18x12" wheels/335mm tires made a big improvement out back. Mark's run above shows the Corvette doing so much better in corner exit than ever before.

Running on fresh 315F/335R Rival-S tires, 18x11/12" wheels, MCS TT2 coilovers, Eibach bars, August 2016
The MCS TT2 coilovers and new swaybars have improved the turn-in massively, and the roll/lean was visibly lower in head-on shots. Compared to the first time I drove the car on "good" tires, at the Optima event in 2014, its a night and day difference. That (below) was on 295/315 Rivals and Koni shocks with stock springs and bars. The new setup (above) has wider and sticker 315/35 Rival-S tires, yet radically less roll/dive/lean.

Running on 18x11" wheels, Koni dampers, stock springs and shocks, and used 295F/315 Rival tires, April 2014
So Mark was feeling good when we loaded up the Corvette that day, but I felt like crap again. And this was our last test event before heading to the 2016 SCCA Solo Nationals. I agreed to this months ago, but now I'm heading back to Lincoln for the first time in 4 years on a "low" for the season. I've gotta get my head in the game and stay hydrated next week in Nebraska. CAM-S is no joke at the National level. If anyone reading this sees me in Lincoln without a bottle of liquid in my hand, tell me to get some water!
ABS FIXES? SWAYBARS + WIDER REAR WHEELS & TIRES
After the July event and before the August autocross we brought the car back to Vorshlag for some updates. After the August event we installed fresh front tires on the C5, in preparation for the Solo Nationals. I will quickly show that here.

The aftermarket swaybar choices for the C5 aren't all that great, but we had supplied Mark's dad's C6 Corvette with an Eibach setup earlier this year. They were adjustable at both ends of the car and nicely built. So Mark wanted a set of Eibach bars for his C5. We ordered the C5 versions (no good pictures exist) and they showed up... non-adjustable. Oh well, they are tubular and larger in diameter, and Donnie installed them here with grease zerks and fitted the bushings to the bars so they can rotate (endlinks removed) with "pinkie effort". That's my rule on swaybars - no bind in the body mount bushings is allowed. Drilled, zerked, fitted, and greased every time.

When I won a single BFG tire for my 2nd place finish at the ProSolo driving Mark's car I donated the winnings to Mark - it was his car, after all. We requested the Rival-S in a 335/30/18 size and rounded up two more 335s after they had run out of stock this summer (thanks for the hookup, whoever you were), which arrived the same day as the wider rear wheels.

Earlier this year we saw some long lead times on custom Forgestar wheels, but this summer the wait times have shrunk as they invest in higher stocking levels of wheel blanks. A pair of 18x12" F14 wheels were custom spec'd rush ordered in "raw" finish (that can save you as much as 3-4 weeks) and mounted with the new 335s out back.

The 18x12's have way more "poke" that I would ever spec for anyone, but Mark finally broke down and said he's commit to flared fenders - at all 4 corners - after Nationals. So we really ordered these 18x12" wheels for the front, but will use them on the rear for Nationals. Forgestar confirmed to me on the phone yesterday that they finally have 18x13" wheel tooling and these wider blanks should be arriving in October time frame. So the rears on this car will go to either 18x13" F14 or 18x14" M14 2-piece Forgestars. The car might switch autocross classes, too.

The 315/30/18 Rival-S has been on backorder for many weeks as well, so we did some searching and Mark bought this set of 4 wheels and 4 new 315s mounted but never raced. Two of these became the "National set" of fronts.

Running race compound brake pads makes the wheels dusty in a short time. One autocross and the red wheels look black (above). One of the things I'm always giving Mark grief about is how dirty he lets the Corvette get. He doesn't care - clean doesn't mean fast - but I keep reminding him that the giant "VORSHLAG" decal on the side means that I do care. So every time it is in my shop we seem to be cleaning it...

We found a trick to cleaning metallic brake dust off of powder coated wheels years ago - a German chemical cleaner called "Sonax wheel cleaner", which I have mentioned here before. We have been ordering this stuff online and it is a bit pricey. Now there's a cheaper USA-made alternative called Code RED, which you can find at Pep Boys stores for about half the price per ounce. It uses the same chemical process that reacts to the iron particles in brake dust, which changes color from green to red once the process is finished. This must be washed off before it dries, and sometimes it takes two coats and some scrubbing, but its the best stuff I've ever seen for cleaning brake material off of wheels.

Another pet peeve of mine with this car for the past year has been the unpainted front bumper cover. We replaced this when his previous co-driver had a big "off" and tore up the nose, but Mark wouldn't let me get it painted then. This time, as a condition of my co-drive, I insisted.

Our friends at Heritage Collision Center in Sherman, Texas did a fine job and painted the nose and licensed plate cover back in body color. They had to do a bit of bodywork, as the unpainted nose took a lot of bug hits over the last year which damaged the surface. It looks as good as new now.

Jon here at Vorshlag made some fresh "class/number panel" decals for the side and they classed up the car a bit from the hand cut tape decals (oiy!).
WHAT'S NEXT?
We worked on some other things this summer, some of which are not finished, and I will talk about them after we readdress them after Nationals. For now we have the C5 as "ready as it can be" and loaded in the trailer. I leave for Nebraska tomorrow, picking up Mark along the way. I have no idea how we will do at Nationals, but I haven't been in 4 years and it will be fun to be there racing, win or lose.
Vorshlag is also sponsoring the "Nationals Winner" jackets for all of the "supplemental" classes: CAM-C, CAM-T, CAM-S, and STP / STPL. These are all classes I feel are too important to ignore, and we have pushed the SCCA hard for two of these classes to be created (namely CAM-S and STP). I will do a write-up after Nationals and talk about the other systems we have been working on, as well as talk about the new autocross classing plans Mark has for this C5 in 2017.
Cheers,
continued from below
SCCA at Lone Star Park, July 30, 2016
Event pic and video gallery: https://vorshlag.smugmug.com/Racing-...-Park-July-30/
At this SCCA regional event Mark's Corvette had 3 drivers - Mark and Chase drove it in CAM-S while I jumped up to "X" class to run it in a different heat. And heat was the key word - it was 97°F during my runs and I forgot to bring my cooler - which led to heat exhaustion that day pretty badly (2 other people at this event went to the hospital that day, from the same effects). It hit me so hard that day that it has crept back and got me another 3 times this summer. I'm really trying to stay ahead of it by drinking lots of water and Gatorade type drinks, but heat is really killing me this year.

You can't see it as much in the in-car video below, but I was fighting the ABS system in all of the big braking zones once again. This run the ABS completely goes bonkers on me and I blew 30 feet off line. The GM ABS is really starting to spook me - I just cannot use the brakes as hard as I can in a Ford, BMW or Subaru. Frustrating.

The handling was much improved with proper rear compression valving set this time, and my raw time was pretty good on my 3rd run, but I clipped a damned cone again - just ran over the base. By my 4th and 5th runs my hands were shaking badly, I slowed down, and I knew I was in trouble with dehydration. That run heat took almost 2 hours and there was nowhere to hide from the relentless sun. By days end it was 104°F and I was close to throwing up. After the Corvette loaded in my trailer and I sat in the truck for 30 minutes with the AC on full blast, trying to regain control of my brain, with a pounding migraine from the heat exhaustion. I somehow got home, then drank a lot of water and passed out by 5 pm and slept for 14 hours. I felt terrible the next day, my whole body hurt. This was a bad day.

My results in the "X" class were marred by my 3rd run cone (4th and 5th runs are thrown out in "X"), so I was somewhere near the bottom of the class. Mark and Chase ran in CAM-S a later heat but were about a second behind my best clean run. The rear tires were really giving up the ghost that day. They have been racing the car every other week all summer on this set, ever since the ProSolo, and did a huge number of runs on the rear tires. After this event we all decided the rear's needed to get bigger, so talked about an 18x12" rear wheel and 335mm tire for the remainder of the season.
SCCA at TMS Bus Lot, August 28th, 2016

Event pic and video gallery: https://vorshlag.smugmug.com/Racing-...t-TMS-Bus-Lot/
This was last weekend's event, but the day before I was at Motorsport Ranch running baseline track times in my wife's 2013 FR-S. I got overheated and was feeling sick Saturday afternoon. On Sunday at the autocross I was already starting "behind" on my hydration, and heat exhaustion kicked my butt again on Sunday. This was getting ridiculous.

I made a point to bring a stocked cooler with waters and Gatorade drinks and kept one in my hand all day, drinking non stop, but the previous day's damage was just too much to un-do. It wasn't even that hot, only about 90°F when I left at 2 pm, but I was feeling it while driving. I hit a record 6 cones over 5 runs in Mark's car that day, fought ICE MODE on every run, and had arguably my worst drive of the year. Right before Nationals, yay...

This layout was what I call a "busy little Miata Course" - as are all of the courses at Texas Region events - but that's what we had to navigate in this car. Mark was ahead of me all day, and I just couldn't seem to get ahead enough on the courses or stay off the cones. I am not even showing my in-car video, its just awful. Mark, however, drove very well and put .425 seconds on me that day and pax'd top 20.

We both felt the recent changes (see below) of new swaybars and wider 18x12" wheels/335mm tires made a big improvement out back. Mark's run above shows the Corvette doing so much better in corner exit than ever before.

Running on fresh 315F/335R Rival-S tires, 18x11/12" wheels, MCS TT2 coilovers, Eibach bars, August 2016
The MCS TT2 coilovers and new swaybars have improved the turn-in massively, and the roll/lean was visibly lower in head-on shots. Compared to the first time I drove the car on "good" tires, at the Optima event in 2014, its a night and day difference. That (below) was on 295/315 Rivals and Koni shocks with stock springs and bars. The new setup (above) has wider and sticker 315/35 Rival-S tires, yet radically less roll/dive/lean.

Running on 18x11" wheels, Koni dampers, stock springs and shocks, and used 295F/315 Rival tires, April 2014
So Mark was feeling good when we loaded up the Corvette that day, but I felt like crap again. And this was our last test event before heading to the 2016 SCCA Solo Nationals. I agreed to this months ago, but now I'm heading back to Lincoln for the first time in 4 years on a "low" for the season. I've gotta get my head in the game and stay hydrated next week in Nebraska. CAM-S is no joke at the National level. If anyone reading this sees me in Lincoln without a bottle of liquid in my hand, tell me to get some water!
ABS FIXES? SWAYBARS + WIDER REAR WHEELS & TIRES
After the July event and before the August autocross we brought the car back to Vorshlag for some updates. After the August event we installed fresh front tires on the C5, in preparation for the Solo Nationals. I will quickly show that here.

The aftermarket swaybar choices for the C5 aren't all that great, but we had supplied Mark's dad's C6 Corvette with an Eibach setup earlier this year. They were adjustable at both ends of the car and nicely built. So Mark wanted a set of Eibach bars for his C5. We ordered the C5 versions (no good pictures exist) and they showed up... non-adjustable. Oh well, they are tubular and larger in diameter, and Donnie installed them here with grease zerks and fitted the bushings to the bars so they can rotate (endlinks removed) with "pinkie effort". That's my rule on swaybars - no bind in the body mount bushings is allowed. Drilled, zerked, fitted, and greased every time.

When I won a single BFG tire for my 2nd place finish at the ProSolo driving Mark's car I donated the winnings to Mark - it was his car, after all. We requested the Rival-S in a 335/30/18 size and rounded up two more 335s after they had run out of stock this summer (thanks for the hookup, whoever you were), which arrived the same day as the wider rear wheels.


Earlier this year we saw some long lead times on custom Forgestar wheels, but this summer the wait times have shrunk as they invest in higher stocking levels of wheel blanks. A pair of 18x12" F14 wheels were custom spec'd rush ordered in "raw" finish (that can save you as much as 3-4 weeks) and mounted with the new 335s out back.

The 18x12's have way more "poke" that I would ever spec for anyone, but Mark finally broke down and said he's commit to flared fenders - at all 4 corners - after Nationals. So we really ordered these 18x12" wheels for the front, but will use them on the rear for Nationals. Forgestar confirmed to me on the phone yesterday that they finally have 18x13" wheel tooling and these wider blanks should be arriving in October time frame. So the rears on this car will go to either 18x13" F14 or 18x14" M14 2-piece Forgestars. The car might switch autocross classes, too.


The 315/30/18 Rival-S has been on backorder for many weeks as well, so we did some searching and Mark bought this set of 4 wheels and 4 new 315s mounted but never raced. Two of these became the "National set" of fronts.

Running race compound brake pads makes the wheels dusty in a short time. One autocross and the red wheels look black (above). One of the things I'm always giving Mark grief about is how dirty he lets the Corvette get. He doesn't care - clean doesn't mean fast - but I keep reminding him that the giant "VORSHLAG" decal on the side means that I do care. So every time it is in my shop we seem to be cleaning it...


We found a trick to cleaning metallic brake dust off of powder coated wheels years ago - a German chemical cleaner called "Sonax wheel cleaner", which I have mentioned here before. We have been ordering this stuff online and it is a bit pricey. Now there's a cheaper USA-made alternative called Code RED, which you can find at Pep Boys stores for about half the price per ounce. It uses the same chemical process that reacts to the iron particles in brake dust, which changes color from green to red once the process is finished. This must be washed off before it dries, and sometimes it takes two coats and some scrubbing, but its the best stuff I've ever seen for cleaning brake material off of wheels.

Another pet peeve of mine with this car for the past year has been the unpainted front bumper cover. We replaced this when his previous co-driver had a big "off" and tore up the nose, but Mark wouldn't let me get it painted then. This time, as a condition of my co-drive, I insisted.



Our friends at Heritage Collision Center in Sherman, Texas did a fine job and painted the nose and licensed plate cover back in body color. They had to do a bit of bodywork, as the unpainted nose took a lot of bug hits over the last year which damaged the surface. It looks as good as new now.

Jon here at Vorshlag made some fresh "class/number panel" decals for the side and they classed up the car a bit from the hand cut tape decals (oiy!).
WHAT'S NEXT?
We worked on some other things this summer, some of which are not finished, and I will talk about them after we readdress them after Nationals. For now we have the C5 as "ready as it can be" and loaded in the trailer. I leave for Nebraska tomorrow, picking up Mark along the way. I have no idea how we will do at Nationals, but I haven't been in 4 years and it will be fun to be there racing, win or lose.
Vorshlag is also sponsoring the "Nationals Winner" jackets for all of the "supplemental" classes: CAM-C, CAM-T, CAM-S, and STP / STPL. These are all classes I feel are too important to ignore, and we have pushed the SCCA hard for two of these classes to be created (namely CAM-S and STP). I will do a write-up after Nationals and talk about the other systems we have been working on, as well as talk about the new autocross classing plans Mark has for this C5 in 2017.
Cheers,
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