View Poll Results: 2-6 Rod Bearing Failures, which 928 engine-trans?
32V 2.727 gearbox (89+)
8
53.33%
32V 2.20 gearbox (85-88)
3
20.00%
16V any gearbox
5
33.33%
Multiple Choice Poll. Voters: 15. You may not vote on this poll
2-6 Rod bearing failure....a study!
04-19-2009, 05:54 PM
#121
Former Vendor
Mark:
I'm "out" on this topic, sorry.
"Keep on keeping on", my friend.
Zero clue
I'm "out" on this topic, sorry.
"Keep on keeping on", my friend.
Zero clue
04-19-2009, 06:32 PM
#122
Rennlist Member
Dont be so hard on yourself. 
Hey, Im always one to look at new ways to do things, and you know that. I spent my entire life around sports and understand there are barriers and boundaries.
You havent gone for a ride with me, so you might not know what or what not, I am doing under braking. I totally agree that the newer ABS systems, often called racing ABS, work as you describe.
Ive had panic stops going into turn 11 at sears in late braking situations and when the ABS kicks in , its like you are on ice. I would guess it doubles the braking distance. Ill try and do some testing by pushing even harder with ABS and tell you what happens. Ill even narate it on video.
As a driver, you get a pretty good feeling of when a tire is locking up. there is far more difference in when two drivers will get into the brakes, vs how much braking force they can apply with and without ABS. Sure, I would love to think there is 3 full seconds available, but thats just not the case. In fact, the top SpeedTouring cars do not have ABS and run only 3 seconds off the top SpeedGT times! think just adding ABS makes a GT car out of a touring car.
You of all people know about the time given for :
Tires, 3 seconds (new hoosiers vs used toyos)
ABS, 3 seconds (you said this)
Weight 2 seconds (common thoughts)
skill, 2 seconds ( ego talks)
AFR ratios 1 second (just a guess)
cam timing 1 second (said somewhere here)
suspension. 3 seconds (said everywhere)
brake upgrades 2 seconds. (said on the list)
Since im lacking in all of the above, my car would be 17 seconds faster if I believed EVERTHING I heard about how much time is left on the table for any number of mods.
Greg, you are one of the top technical guys here. You talk about Anderson being able to drive the wheels off the car. How is it i was able to run faster than Mark did at laguna and Sears with 100less HP? Do you think I was able to handle the car properly to do this? 1:40.1 vs my 1:40.2 on the same track, no real differences at laguna and much faster than him at his first time at Sears running 1:50.2 vs his 1:51.3 WC speedvision race and qual. (also no track changes). TV even made a comment about the "porsche brakes" when I was in the rear view cam of Derek Bell in my 15 year old racer compared to his 4x4 audi with the best of everything! I raced Pobst in a car that had MORE hp than me, was lighter weight and had ABS vs my no ABS. He was only 1 second faster, and no abs in the world could have made up that difference.
Not to mention he had a $100k GrandAm GS BMW under him as well!
(and new R6 hoosiers, motons, Data aqu., etc etc)
I know you have a wealth of knowledge on the sport and have been "In" it for years. Ill try and see if what you are saying is true, but also think that maybe some of the limits can be found in our cars, without ABS. Like I said before. the Caddy and Vipers with top drivers have bounced back and forth between ABS and no ABS. These are top pros. Their times didnt vary that much. When the "NO" ABS is a problem, like with the vipers, is when it starts acting up and making certain wheels lock up and THAT will slow you down.
mk
Hey, Im always one to look at new ways to do things, and you know that. I spent my entire life around sports and understand there are barriers and boundaries.
You havent gone for a ride with me, so you might not know what or what not, I am doing under braking. I totally agree that the newer ABS systems, often called racing ABS, work as you describe.
Ive had panic stops going into turn 11 at sears in late braking situations and when the ABS kicks in , its like you are on ice. I would guess it doubles the braking distance. Ill try and do some testing by pushing even harder with ABS and tell you what happens. Ill even narate it on video.
As a driver, you get a pretty good feeling of when a tire is locking up. there is far more difference in when two drivers will get into the brakes, vs how much braking force they can apply with and without ABS. Sure, I would love to think there is 3 full seconds available, but thats just not the case. In fact, the top SpeedTouring cars do not have ABS and run only 3 seconds off the top SpeedGT times! think just adding ABS makes a GT car out of a touring car.
You of all people know about the time given for :
Tires, 3 seconds (new hoosiers vs used toyos)
ABS, 3 seconds (you said this)
Weight 2 seconds (common thoughts)
skill, 2 seconds ( ego talks)
AFR ratios 1 second (just a guess)
cam timing 1 second (said somewhere here)
suspension. 3 seconds (said everywhere)
brake upgrades 2 seconds. (said on the list)
Since im lacking in all of the above, my car would be 17 seconds faster if I believed EVERTHING I heard about how much time is left on the table for any number of mods.
Greg, you are one of the top technical guys here. You talk about Anderson being able to drive the wheels off the car. How is it i was able to run faster than Mark did at laguna and Sears with 100less HP? Do you think I was able to handle the car properly to do this? 1:40.1 vs my 1:40.2 on the same track, no real differences at laguna and much faster than him at his first time at Sears running 1:50.2 vs his 1:51.3 WC speedvision race and qual. (also no track changes). TV even made a comment about the "porsche brakes" when I was in the rear view cam of Derek Bell in my 15 year old racer compared to his 4x4 audi with the best of everything! I raced Pobst in a car that had MORE hp than me, was lighter weight and had ABS vs my no ABS. He was only 1 second faster, and no abs in the world could have made up that difference.
Not to mention he had a $100k GrandAm GS BMW under him as well!
(and new R6 hoosiers, motons, Data aqu., etc etc)
I know you have a wealth of knowledge on the sport and have been "In" it for years. Ill try and see if what you are saying is true, but also think that maybe some of the limits can be found in our cars, without ABS. Like I said before. the Caddy and Vipers with top drivers have bounced back and forth between ABS and no ABS. These are top pros. Their times didnt vary that much. When the "NO" ABS is a problem, like with the vipers, is when it starts acting up and making certain wheels lock up and THAT will slow you down.
mk
04-19-2009, 07:03 PM
#123
Rennlist Member
One key point that Carrol makes in his book "tune to win" . He says:
"On average road racing circuit, something less than ten percent of the time required to complete a lap is spent braking. Therefore a five percent improvement in braking performance in a would net a theoretical improvement in lap time of one half of one percent or about one half second in a 90 second lap." He goes on to say, big increases in brake performance comes in areas of confidence, control, and consistancy.
Again, if there is 3 seconds found in ABS, I would think Anderson would be able to bolt it back on and run ALMS GT2 times!. But, we all know that wouldnt happen! Also, in theory, its not even possible!
mk
"On average road racing circuit, something less than ten percent of the time required to complete a lap is spent braking. Therefore a five percent improvement in braking performance in a would net a theoretical improvement in lap time of one half of one percent or about one half second in a 90 second lap." He goes on to say, big increases in brake performance comes in areas of confidence, control, and consistancy.
Again, if there is 3 seconds found in ABS, I would think Anderson would be able to bolt it back on and run ALMS GT2 times!
. But, we all know that wouldnt happen! Also, in theory, its not even possible! mk
