Race car dyno video, and invitiation to our first race this season
04-24-2015, 10:40 AM
#16
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Link to the track map is here:
http://www.nasamidwest.com/season/?p...&eventid=28819
you might enjoy that.
http://www.nasamidwest.com/season/?p...&eventid=28819
you might enjoy that.
04-24-2015, 02:19 PM
#17
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Carl -- I'm continually impressed with the amount of detail you give to the car, making it more real race-car than a 'street car driven fast on a track'. Kudos on all the work, good luck and have fun on Sunday.
04-24-2015, 02:37 PM
#18
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That South Course looks like a tough little tight track with some very slow turns and lots of them.....should be interesting with a big powerful rear wheel drive pounding around in 2nd and 3rd gear. Only one decent straight but with a 90 degree right turn at the end 
That will test the brakes ! about 150mph down to 40 every minute and 1/2. Have fun that is all that matters.
That will test the brakes ! about 150mph down to 40 every minute and 1/2. Have fun that is all that matters.
04-24-2015, 04:30 PM
#19
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ptuomov: that was one of my objectives. We had engine dyno numbers, I wanted chassis dyno numbers so I could learn what my drive-train loss was through the T56. Alas, it was not to be. We had the wheel slip on the dyno, and not enough time for me to effort the correction and get the chassis dyno number. It was a shame - I would have liked to know that.
even with the wheel slip , what was the difference? i think the Peak HP number vs what you saw on the engine dyno would suffice . also, even the HP at the slower RPM would be interesting, dyno vs engine dyno.
I have the rolling HP losses for the tires on a drum (close to road numbers x almost 2 because the front wheels also are rolling and have lose) that number was about 20hp at 150mph down 10hp at 80mph.
04-24-2015, 05:05 PM
#20
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Carl -- I'm continually impressed with the amount of detail you give to the car, making it more real race-car than a 'street car driven fast on a track'. Kudos on all the work, good luck and have fun on Sunday.
The builds for Pikes Peak and Bonneville were intensive and pushed this car's development far in a relatively little time. Those helped a lot.
04-24-2015, 05:14 PM
#21
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Pics from 2001 and 2002 with this car.... the early days... just for fun....
Those high-speed auto-crosses had a high dollar-to-fun ratio... open trailer, towed behind my Tahoe. Some I even drove to, raced, and drove the car home. Ballsy!
Those high-speed auto-crosses had a high dollar-to-fun ratio... open trailer, towed behind my Tahoe. Some I even drove to, raced, and drove the car home. Ballsy!
04-24-2015, 05:16 PM
#22
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That South Course looks like a tough little tight track with some very slow turns and lots of them.....should be interesting with a big powerful rear wheel drive pounding around in 2nd and 3rd gear. Only one decent straight but with a 90 degree right turn at the end That will test the brakes ! about 150mph down to 40 every minute and 1/2. Have fun that is all that matters.
04-24-2015, 05:17 PM
#23
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That South Course looks like a tough little tight track with some very slow turns and lots of them.....should be interesting with a big powerful rear wheel drive pounding around in 2nd and 3rd gear. Only one decent straight but with a 90 degree right turn at the end That will test the brakes ! about 150mph down to 40 every minute and 1/2. Have fun that is all that matters.
That will test the brakes ! about 150mph down to 40 every minute and 1/2. Have fun that is all that matters. Its exactly the same distance as Laguna Seca's main straight! with all that power, i would say 150 certainly could be a possibility!I hope you are filming the event! incar cam , behind you PLEASE!! should be amazing to hear that beast open it up!!
Last edited by mark kibort; 04-24-2015 at 05:48 PM.
04-24-2015, 05:20 PM
#24
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That would be great to hear, especially from the T56.
even with the wheel slip , what was the difference? i think the Peak HP number vs what you saw on the engine dyno would suffice . also, even the HP at the slower RPM would be interesting, dyno vs engine dyno.
I have the rolling HP losses for the tires on a drum (close to road numbers x almost 2 because the front wheels also are rolling and have lose) that number was about 20hp at 150mph down 10hp at 80mph.
even with the wheel slip , what was the difference? i think the Peak HP number vs what you saw on the engine dyno would suffice . also, even the HP at the slower RPM would be interesting, dyno vs engine dyno.
I have the rolling HP losses for the tires on a drum (close to road numbers x almost 2 because the front wheels also are rolling and have lose) that number was about 20hp at 150mph down 10hp at 80mph.
04-24-2015, 05:53 PM
#26
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i wonder if he can get up to 150 on a 1850ft straight before turn in. Thats much less than the main straight at willow, which is downhill too. Its exactly the same distance as Laguna Seca's main straight! with all that power, i would say 150 certainly could be likely!
I hope you are filming the event! incar cam , behind you PLEASE!! should be amazing to hear that beast open it up!!
Its exactly the same distance as Laguna Seca's main straight! with all that power, i would say 150 certainly could be likely!I hope you are filming the event! incar cam , behind you PLEASE!! should be amazing to hear that beast open it up!!
Add in 40-50 mph entry speed off the corner and the "extra" 350 feet or so to accelerate.....bigger sticky tires much less weight. Should be no problem hitting 150
04-24-2015, 08:09 PM
#27
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Given that a stock heavy Shelby 500 with 662hp does the 1/4 mile from a dead stop and hits 125mph that is only 1320 ft Add in 40-50 mph entry speed off the corner and the "extra" 350 feet or so to accelerate.....bigger sticky tires much less weight. Should be no problem hitting 150
Add in 40-50 mph entry speed off the corner and the "extra" 350 feet or so to accelerate.....bigger sticky tires much less weight. Should be no problem hitting 150seconds too!
40mph off the prior turn is the same as laguna's last turn and that's only about 2 seconds in a quartermile. All that power is needed for the last 20mph vs us mere mortals. (at 130mph down those straights with 3000lbs and near 400 to 500rwhp)
How long does it take that cobra to go from 125 to 150mph.......Hint: Think about 200ft per second
In fact, the car that has 800hp and has run this distance , from exit to top speed, is the Mclaren F1 and Porsche 918.... guess what they top out at? you got it 155mph with a Pro at the helm on that 1850ft straight.
CARL...... make SURE you download "RACE TRACE" for the track weekend. you just hit the "go" button and the rest is automatic on your Iphone. its a really great software.... even gets plots of speeds on all straights, and even your cars position on the track, over every lap! (not very accurate though) but what is accurate is the top speed and lap time.
04-27-2015, 10:46 AM
#28
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Results: If you have been following my Face Book posts from the race track you already know this...
(If not, join us on FB!) https://www.facebook.com/pages/928-M...02377033156459
Cut-to-the-chase: the camshaft drive chain broke on the last lap of my qualifying race. Punched a hole in the cam cover from the inside-out as shown below. There was a big puff of smoke (oil on the headers) and the engine stumbled to a stop.
This was a OEM Porsche part. It had only 20 hours on it, so when I refreshed this motor, I inspected it and put it back in (my bad). I have never personally seen this failure before, and we have been running high-lift cams and stronger-than-stock valve springs for a long time. So it wasnt high on my radar as a part that sees frequent failure. It is now. I will replace them at the end of every season from now on just as a matter of course.
I hope this is a non-interference motor - I built it at 8.5:1 CR. We think it is, but we are about to find out for sure.
The irony is I proofed this engine on an engine dyno (where I broke it in) and then after it was installed I "drove" the car on the chassis dyno too, just to be sure the whole drive-train was working as it should. We were looking for leaks, failure points, etc to discover them before our first race. Argh. As we all know - nothing stresses a vehicle like racing. Even dyno's are no match.
In the good news category, I was just getting comfortable with the set-up and it was very good. New differential from RPM Transmissions, with high-strength carbon fiber disks and springs, wanted to understand how it would behave, and whether they had my decel ramps set right to avoid understeer mid-corner. They did a great job. It was very drive-able. I could modulate the throttle mid-corner with comfort. The trans gate is much smaller than I am used to, I had been concerned it would almost be TOO tight. I hit 5th when I wanted third on the chassis dyno, for example. Yet, in practical use, I had no trouble and it behaved very well. There were a dozen other things I was checking out - so my first practice session I was definitely the last car at the back.
By the time this chain broke, I was starting to get into it with some confidence, and eating up cars as I wen. Much fun!
We will roll the car out of the trailer today and take I peak under that camshaft cover and see what we've got. I hope the sprocket on the camshaft isn't damaged!
(If not, join us on FB!) https://www.facebook.com/pages/928-M...02377033156459
Cut-to-the-chase: the camshaft drive chain broke on the last lap of my qualifying race. Punched a hole in the cam cover from the inside-out as shown below. There was a big puff of smoke (oil on the headers) and the engine stumbled to a stop.
This was a OEM Porsche part. It had only 20 hours on it, so when I refreshed this motor, I inspected it and put it back in (my bad). I have never personally seen this failure before, and we have been running high-lift cams and stronger-than-stock valve springs for a long time. So it wasnt high on my radar as a part that sees frequent failure. It is now. I will replace them at the end of every season from now on just as a matter of course.
I hope this is a non-interference motor - I built it at 8.5:1 CR. We think it is, but we are about to find out for sure.
The irony is I proofed this engine on an engine dyno (where I broke it in) and then after it was installed I "drove" the car on the chassis dyno too, just to be sure the whole drive-train was working as it should. We were looking for leaks, failure points, etc to discover them before our first race. Argh. As we all know - nothing stresses a vehicle like racing. Even dyno's are no match.
In the good news category, I was just getting comfortable with the set-up and it was very good. New differential from RPM Transmissions, with high-strength carbon fiber disks and springs, wanted to understand how it would behave, and whether they had my decel ramps set right to avoid understeer mid-corner. They did a great job. It was very drive-able. I could modulate the throttle mid-corner with comfort. The trans gate is much smaller than I am used to, I had been concerned it would almost be TOO tight. I hit 5th when I wanted third on the chassis dyno, for example. Yet, in practical use, I had no trouble and it behaved very well. There were a dozen other things I was checking out - so my first practice session I was definitely the last car at the back.
By the time this chain broke, I was starting to get into it with some confidence, and eating up cars as I wen. Much fun!
We will roll the car out of the trailer today and take I peak under that camshaft cover and see what we've got. I hope the sprocket on the camshaft isn't damaged!
Last edited by Carl Fausett; 04-27-2015 at 11:14 AM.