928 Track data during high G turns (pics of gauges mid qualifying)
#17
Three Wheelin'
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For a track car I think the best is a large (2 5/8 or larger) high quality mechanical gauge plumbed with -4 (or no less than-3) teflon hose. that way, the only orfice is at the gauge. Back that up with a large idiot lite.
#18
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Guys, i seemed to remember a loose connection at the oil temp gauge when i was seeing theses readings a long time ago. I think that might be the cause.
Ill check.... however, i diid put the extra oil in to make sure it was full the next time and that issue didnt happen again. could be just coincidence that the short or broken connection was occurring the next few sessions. However, I dont know how that gauge works, or if there is hotter air above the oil or not. Just as no one really knows if the oil sump pick up is getting uncovered at willow more than any other track.![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
I spent a lot of time making sure the car was shifted at close to redline every shift and was watching the oil pressure gauge when ever i didnt distract me this race weekend
I have some great suspension video of the 928 going full tilt at T-hill. Here is a screen shot.. its funny, you can easily know every turn at the track, just by engine RPM and gear. anyone that knows t hill will see that (or hear it)
a lots of movement on that 335 rear tire! dont see the rim moving that much .. so goes the forces that could possibly move the camber eccentrics.
Ill check.... however, i diid put the extra oil in to make sure it was full the next time and that issue didnt happen again. could be just coincidence that the short or broken connection was occurring the next few sessions. However, I dont know how that gauge works, or if there is hotter air above the oil or not. Just as no one really knows if the oil sump pick up is getting uncovered at willow more than any other track.
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
I spent a lot of time making sure the car was shifted at close to redline every shift and was watching the oil pressure gauge when ever i didnt distract me this race weekend
I have some great suspension video of the 928 going full tilt at T-hill. Here is a screen shot.. its funny, you can easily know every turn at the track, just by engine RPM and gear. anyone that knows t hill will see that (or hear it)
a lots of movement on that 335 rear tire! dont see the rim moving that much .. so goes the forces that could possibly move the camber eccentrics.
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
#19
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no, all the wires are secure... kind of a cool phenom though... very few tests anyone has conducted have to do with where the oil really is in the pan under g loading. a simple test is to get the car to temp and see if I can simulate it by pulling the dipstic in and out of the oil and see if there is an instant change in temp.
by the way some video coming.... fender cam to see the wheel movement under high gs, gauge cam, in car cam, rear view cam, and suspension cam all under race conditions at thunderhill ... which has some of the most demanding sustained High g turns sans willow springs.
stand by.....................
it was a guess, due to trying to find a cause to an observation...... Kind of like all of us do when trying to guess why we see the things we do..
my thoughts is there is blow by of the 1000 degree temp gases around the pistons that might fill the space betweenn the oil reservoir and rotating components.
my bet is a loose wire... again, i seemed to remember this happening before and a certain wire if loose under g forces could cause the gauge to peg full temp.
by the way some video coming.... fender cam to see the wheel movement under high gs, gauge cam, in car cam, rear view cam, and suspension cam all under race conditions at thunderhill ... which has some of the most demanding sustained High g turns sans willow springs.
stand by.....................
my thoughts is there is blow by of the 1000 degree temp gases around the pistons that might fill the space betweenn the oil reservoir and rotating components.
my bet is a loose wire... again, i seemed to remember this happening before and a certain wire if loose under g forces could cause the gauge to peg full temp.
Last edited by mark kibort; 10-27-2015 at 01:03 PM.
#20
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Here is some comprehensive video of the 928 on the track.
rear suspension-cam to show shocks, springs, wheel movement control arms, etc watch the big sticky rubber move on the pavment under high g loading.
front wheel-cam.... front wheel movement during high g loading
and gauge-cam to see temps, rpm, MPH, etc around a 1:59ish lap at thunderhill
rear suspension-cam to show shocks, springs, wheel movement control arms, etc watch the big sticky rubber move on the pavment under high g loading.
front wheel-cam.... front wheel movement during high g loading
and gauge-cam to see temps, rpm, MPH, etc around a 1:59ish lap at thunderhill
#22
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#24
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#25
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I had a long discussion about Willow Springs and its unique "issues" about oiling, with good friend Dwain Dement (Vision Motorsports), this last week.
Currently, Dwain's expertise is directed at the 997/997/Boxster/Cayman engines and what it takes to make them survive on the track. He "over sensored" one of these engines that had Motec and got back some really interesting data.
Turns out that turn #6, where the cars get "really light", is the disastrous corner for these engines. The pick-ups get completely uncovered and the oil pressure drops to zero.
Interestingly enough, because the stock oil pressure sender also has a tiny orifice (like the 928 oil pressure sender), this only registers as an oil pressure drop on the stock gauge, but is much more dramatic in reality.
Currently, Dwain's expertise is directed at the 997/997/Boxster/Cayman engines and what it takes to make them survive on the track. He "over sensored" one of these engines that had Motec and got back some really interesting data.
Turns out that turn #6, where the cars get "really light", is the disastrous corner for these engines. The pick-ups get completely uncovered and the oil pressure drops to zero.
Interestingly enough, because the stock oil pressure sender also has a tiny orifice (like the 928 oil pressure sender), this only registers as an oil pressure drop on the stock gauge, but is much more dramatic in reality.
I'm still waiting on your assessment of the track... why would turn 8 or 9 be anywhere close to as bad for the 928 or any other car for that matter, than Big willow turn 2????
#26
Former Vendor
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and we don't see any oil pressure drop at all at that point on the track, and, that point of weightlessness is so brief, I don't see how that can be a problem...
I'm still waiting on your assessment of the track... why would turn 8 or 9 be anywhere close to as bad for the 928 or any other car for that matter, than Big willow turn 2????
I'm still waiting on your assessment of the track... why would turn 8 or 9 be anywhere close to as bad for the 928 or any other car for that matter, than Big willow turn 2????
I don't make up what happens at Willow, nor do I have to explain it. The "trail" of blown 928 engines at Willow Springs speaks volumes for everyone....except you.
No 928 engine driven faster than about a 1:32.00 with a stock oiling system, has ever survived Willow Springs...
Zero.
Try and be intelligent enough to understand that this is not "my rules". It's not something I have made up! I'm not responsible for it!
It's pure and simple.....it's f^cking reality.
Now, please leave any reference of me out of your posts.....I'm not interested.
Take your ego and self promotion somewhere else....I've had enough of it to last me through my entire life, thank you very much!
#27
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Don't care. Not worth my time to debate with you, any more.
I don't make up what happens at Willow, nor do I have to explain it. The "trail" of blown 928 engines at Willow Springs speaks volumes for everyone....except you.
No 928 engine driven faster than about a 1:32.00 with a stock oiling system, has ever survived Willow Springs...
Zero.
Try and be intelligent enough to understand that this is not "my rules". It's not something I have made up! I'm not responsible for it!
It's pure and simple.....it's f^cking reality.
Now, please leave any reference of me out of your posts.....I'm not interested.
Take your ego and self promotion somewhere else....I've had enough of it to last me through my entire life, thank you very much!
I don't make up what happens at Willow, nor do I have to explain it. The "trail" of blown 928 engines at Willow Springs speaks volumes for everyone....except you.
No 928 engine driven faster than about a 1:32.00 with a stock oiling system, has ever survived Willow Springs...
Zero.
Try and be intelligent enough to understand that this is not "my rules". It's not something I have made up! I'm not responsible for it!
It's pure and simple.....it's f^cking reality.
Now, please leave any reference of me out of your posts.....I'm not interested.
Take your ego and self promotion somewhere else....I've had enough of it to last me through my entire life, thank you very much!
Ive been there a couple of times and run the car to a 1:33 for a weekend. so yes, not a 1:32, but a 1:33 ... but that was back around 2000.
so, whats the bet? if you want to back out of the challenge, just give me a target time to hit, based on your (our)Hero's best time with all the mods and on slicks over the many years he has driven the track.
since he has run 1:24 as a best and i think Joseph is in the 24s as well, what do i need to do to prove you wrong about the 928. is 4-5 seconds fair as a handicap for:
1. no slicks
2. 200 less HP
3. no big wing
4. no where near as good as a driver, in your words
5. no motons
6. no 1" wider track
7. no 12" rims
8. no big brakes
9. no 100lbs less weight
10. no 2.72 rear end with GTS LSD
So, there are 10 things that in "reality" should help any drivers time? agreed?
each one should be worth, "in reality" about a second or two, correct?
So Greg, if i run in the 1:28-9, in my 928 this willl be the NEW "f'ing Reality" for you? you pick the time which you would think is impossible for the stock oiling system for a 928 to survive.......
you say a trail of 928s have been destroyed there ... i say its for reasons ive mentioned. mainly not keeping the engine near stock (scrapers, windage trays, bad oil , poor warm up, driver errors, etc)
are we going to do our challenge??
or just a simple Bet.. Put your money and reputation on your words Greg. I'm wiling to risk it all and back up what ive said..... are you ?
I could be out there as soon as next month for the Big Bore runnoff if they let me run.
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edit: and Greg, you might be right as well... its the risk i am willing to take.....But, why cant you discuss it? its a valid question, im having a major problem with the theories of why some have failed with stock oiling at Willow springs... again, my question is why turn 8-9 are any different than any other turn i visit. also, why isnt turn 2 the one you are concerned about. heck, it has NOTHING to do with the 130mph speeds you hit in the turn.. its about the G forces... arent they the same everywhere , or is willow like the equivalent of the Bermuda triangle . are you that superstitious?
Last edited by mark kibort; 10-29-2015 at 02:12 PM. Reason: spelling
#29
Former Vendor
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Trackday Comedy - FLAT OUT - YouTube
That was hilarious , havent we seen this regularly at track days , havent laughed so much in awhile
That was hilarious , havent we seen this regularly at track days , havent laughed so much in awhile
How many times have you seen that?
(I'm betting that Kibort wears his driving suit to breakfast.)
#30
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