Porsche cheated in the world record speed video...
11-26-2008, 09:19 PM
#17
Three Wheelin'
yes, I have this car and have been racing it for 7 years now. only recently the engine was pulled to see if any magical changes were done to the bottomend, and it sure looks like its stock. (no squirters either 
)
It did have custom cams, but the cams were basically 85 cams, but more like GT cams. upon switching the "Holbert cams" out, i got near the same HP on the dyno by using the replacement 85 cams.
I studied that video pretty well, to find the little things that pointed it being my car. Things like the white in the door jams and under the hood (it was hastlely painted red for the record run. also , you can see the maroon interior. It also had no fender marker lights neither front or rear. We absolutely know my car was an IMSA rescue recovery vehicle, as there are other pics of things on the car that you might not notice. one of the things i heard about the limits of breaking the record, was wheel spin on the salt. as Jim mentioned, it went 180mph at Nardo in March a few months earlier. As I found the car, it did 295rwhp on the dyno before headers, and some basic corrective tuning.
(plugs, rotors, caps, proper key'ing of the coding plug, and holes in the airbox)
it was interesting that they used the automatic 86 chassis for the platform for the first S4. they had to convert it to a stick a the factory. found all sorts of funny things there when i went to rebuild the pedal system with Jim at 928inl's help. Mark Anderson and company helped with the initial build up of the Holbert racer with one of the most important conversions. the dual disc clutch conversion.
Now its got a stroker motor under all the stuff it came with. the old block looks fine and maybe one day, will find its way back under the 'ole holbert machine. (with a CF intake and radical cams, )
This chassis has had quite a life. Over 21 years, it broke the WR land speed record for production cars, was an IMSA pace car, and was then raced for 7 full racing seasons with out a DNF, while most always driven to the track and back! 108 racing days logged so far. a true testimate to porsche engineering!
(and Amsoil
)
Mk
)It did have custom cams, but the cams were basically 85 cams, but more like GT cams. upon switching the "Holbert cams" out, i got near the same HP on the dyno by using the replacement 85 cams.
I studied that video pretty well, to find the little things that pointed it being my car. Things like the white in the door jams and under the hood (it was hastlely painted red for the record run. also , you can see the maroon interior. It also had no fender marker lights neither front or rear. We absolutely know my car was an IMSA rescue recovery vehicle, as there are other pics of things on the car that you might not notice. one of the things i heard about the limits of breaking the record, was wheel spin on the salt. as Jim mentioned, it went 180mph at Nardo in March a few months earlier. As I found the car, it did 295rwhp on the dyno before headers, and some basic corrective tuning.
(plugs, rotors, caps, proper key'ing of the coding plug, and holes in the airbox)
it was interesting that they used the automatic 86 chassis for the platform for the first S4. they had to convert it to a stick a the factory. found all sorts of funny things there when i went to rebuild the pedal system with Jim at 928inl's help. Mark Anderson and company helped with the initial build up of the Holbert racer with one of the most important conversions. the dual disc clutch conversion.
Now its got a stroker motor under all the stuff it came with. the old block looks fine and maybe one day, will find its way back under the 'ole holbert machine. (with a CF intake and radical cams,
) This chassis has had quite a life. Over 21 years, it broke the WR land speed record for production cars, was an IMSA pace car, and was then raced for 7 full racing seasons with out a DNF, while most always driven to the track and back! 108 racing days logged so far. a true testimate to porsche engineering!
(and Amsoil
)Mk
11-26-2008, 10:02 PM
#18
Administrator - "Tyson"
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The car in question is an S4 with a 6,400rpm rev limiterand a 2:20 diff.
Maybe you should check your math again (hint, theoretical top speed of this combo is well north of 180mph)
All the best
11-26-2008, 10:07 PM
#19
Three Wheelin'
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Because Brett, you have a habbit of applying what you know about your car to every other 928.
The car in question is an S4 with a 6,400rpm rev limiterand a 2:20 diff.
Maybe you should check your math again (hint, theoretical top speed of this combo is well north of 180mph)
All the best
The car in question is an S4 with a 6,400rpm rev limiterand a 2:20 diff.
Maybe you should check your math again (hint, theoretical top speed of this combo is well north of 180mph)
All the best
Hi
Lolllll,,,your maths is rubbish, and also you are missing out a figure....
Try again.....and you STILL wont get 180 mph....
All the best Brett
11-26-2008, 10:33 PM
#22
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11-26-2008, 10:54 PM
#24
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11-26-2008, 11:11 PM
#25
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Air resistance factor (Cd) x Front surface (A) m2 = air resistance index
928 MJ 1978 to 1982: 0.41 x 1.95 = 0.799
928 S MJ 1980 to 1986: 0.38 x 1.95 = 0.741
928 S4 MJ 1987 to 1991 (also CS. GT): 0.34 x 1.98 = 0.673
928 GTS MJ 1992 to 1995: 0.35 x 2.02 = 0.707
928 MJ 1978 to 1982: 0.41 x 1.95 = 0.799
928 S MJ 1980 to 1986: 0.38 x 1.95 = 0.741
928 S4 MJ 1987 to 1991 (also CS. GT): 0.34 x 1.98 = 0.673
928 GTS MJ 1992 to 1995: 0.35 x 2.02 = 0.707
11-27-2008, 12:35 AM
#28
Rennlist Member
It did 180mph, (even with its .34Cd) and it did it at near 5500rpm. If peak hp is found near there, the 2.2 is actually the best gear box to hit it. (or hit near it).
172 happens right where most S4s have their peak HP . right around 5100rpm.
mk
172 happens right where most S4s have their peak HP . right around 5100rpm.
mk
11-27-2008, 12:38 AM
#29
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As much as i love you bro, you did point to the rev limiter as the way to reach 180mph. I think the diving catch playing the drag card (Cd), was a little late.
mk
mk
Last edited by mark kibort; 11-27-2008 at 12:57 AM.
11-27-2008, 12:52 AM
#30
Owns the Streets
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Holeeeee cow.
I can go 216mph. Weeeeeeee!
Ossifer:"Excuse me. Do you know how fast you were going?"
Me:"Yes. And I'm NOWHERES near my peak HP in 5th."
When I got my car, there was a CD jammed in the gap just above the aftermarket Sony CD player.
I can go 216mph. Weeeeeeee!
Ossifer:"Excuse me. Do you know how fast you were going?"
Me:"Yes. And I'm NOWHERES near my peak HP in 5th."
When I got my car, there was a CD jammed in the gap just above the aftermarket Sony CD player.