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After break in comes the Drag strip ;)

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Old Apr 1, 2013 | 07:33 AM
  #16  
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Congratulations once again for turning that time, hova00. I gave you a "Rep" point for sharing your experience with us.

There is a dedicated racer on the ZO6 forum named Ranger. He also shares all his secrets. A stock 505HP ZO6 is supposed to turn high elevens; Ranger managed an 11.02.

He threw on a set of drag radials and went 10.71, so traction is, without a doubt, an integral key.

His tire pressure (with stock tires) was set at: Tire pressure 44-48 psi (front); 24-28 psi (rear).

You can read more about his results and findings here:
http://forums.corvetteforum.com/c5-z...echniques.html

I personally gained a lot of knowledge from Ranger when I had my ZO6, and I can assure you he is a man worth listening to when it comes to chasing a number. In the past he's even driven long distances to meet and help fellow forum members achieve their goals at the drag-strip.

Lower that 60-foot and you'll see your mid-eleven.
 
Old Apr 1, 2013 | 08:42 AM
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Originally Posted by CarreraPete
Congratulations once again for turning that time, hova00. I gave you a "Rep" point for sharing your experience with us.

There is a dedicated racer on the ZO6 forum named Ranger. He also shares all his secrets. A stock 505HP ZO6 is supposed to turn high elevens; Ranger managed an 11.02.

He threw on a set of drag radials and went 10.71, so traction is, without a doubt, an integral key.

His tire pressure (with stock tires) was set at: Tire pressure 44-48 psi (front); 24-28 psi (rear).

You can read more about his results and findings here:
http://forums.corvetteforum.com/c5-z...echniques.html

I personally gained a lot of knowledge from Ranger when I had my ZO6, and I can assure you he is a man worth listening to when it comes to chasing a number. In the past he's even driven long distances to meet and help fellow forum members achieve their goals at the drag-strip.

Lower that 60-foot and you'll see your mid-eleven.
Carrera Pete, I believe Ranger wrote a book on how to extract the most from your car at the drag strip. He approaches this from a scientific point of view. Let's also not forget Jamie Furman.
I could be wrong, but I believe the reason for the low pressure in the rear tires is because of the difficulty in getting traction. Higher pressure in the rear tires would cause the wheels to spin. Lowering the pressure allowed the tires to bite. The reverse might be true for a rear engined car where the weight bias is on the rear tires.
 
Old Apr 1, 2013 | 10:58 AM
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Originally Posted by handfull
Carrera Pete, I believe Ranger wrote a book on how to extract the most from your car at the drag strip. He approaches this from a scientific point of view. Let's also not forget Jamie Furman.
I could be wrong, but I believe the reason for the low pressure in the rear tires is because of the difficulty in getting traction. Higher pressure in the rear tires would cause the wheels to spin. Lowering the pressure allowed the tires to bite. The reverse might be true for a rear engined car where the weight bias is on the rear tires.
Yes, thanks for the reminder: Jamie Furman does deserve a mention.

I understand your thoughts about the rear pressure for tire spin, but I always found that higher pressure in the front tires managed to cut down on resistance while traveling along the asphalt.

I also should mention how glad I am that I followed my wife's advice and purchased one of these outstanding P-cars!
 
Old Apr 1, 2013 | 11:13 AM
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Originally Posted by CarreraPete
Yes, thanks for the reminder: Jamie Furman does deserve a mention.

I understand your thoughts about the rear pressure for tire spin, but I always found that higher pressure in the front tires managed to cut down on resistance while traveling along the asphalt.

I also should mention how glad I am that I followed my wife's advice and purchased one of these outstanding P-cars!
Yes, they are outstanding and had it not been for my 6 hour test drive through canyons and back roads I would have never known just how good this car is!!! You know, this is the first time that I can recall my wife actually participating in the selection process. It did however cost me all new bathrooms. I can't wait for my S X51.
 
Old Apr 9, 2013 | 04:08 PM
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Originally Posted by kouzman
Yep that's me! Good old days. Lol!



Sorry if i am driving you crazy but One last question... PSM on or off?
Sorry for the late response but PSM was on
 
Old Apr 9, 2013 | 04:34 PM
  #21  
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Amazing time for a stock car just barely out of break in no less. Regarding PSM, I thought it must be off in order to activate launch control? If you got that 60 foot time with PSM on, I would imagine that another tenth can be had on 60 foot as well as 1/4. I have a 7mt and wonder how much slower, if at all, it would be than pdk at a drag strip. Lastly, I'm assuming this track is at sea level or not much above? Congrats again and keep us updated when you dyno.

Btw, I too came from a mostly stock e92 m3 bit never had a chance to go out to the strip. What were your times/mods for that?
 

Last edited by GTSLVR991S; Apr 9, 2013 at 04:36 PM.
Old Apr 9, 2013 | 05:10 PM
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Seems the PDK is worth, what, about 3 tenths?

Originally Posted by hova00
Temps were in the high 50's low 60's.

My goal is to get the car to run 11.5@120+ stock.
I need to play around with some things and see if it can happen.
The consistent shifting of the PDK at least gives you baseline with the consistency of the shifts. Might be hard to better that launch though?

Originally Posted by handfull
Carrera Pete, I believe Ranger wrote a book on how to extract the most from your car at the drag strip. He approaches this from a scientific point of view. Let's also not forget Jamie Furman.
I could be wrong, but I believe the reason for the low pressure in the rear tires is because of the difficulty in getting traction. Higher pressure in the rear tires would cause the wheels to spin. Lowering the pressure allowed the tires to bite. The reverse might be true for a rear engined car where the weight bias is on the rear tires.
OP will want to go with as high tire pressure as possible before sacrificing the 60ft in order to minimize rolling resistance. A delicate balancing act.

Originally Posted by GTSLVR991S
Amazing time for a stock car just barely out of break in no less. Regarding PSM, I thought it must be off in order to activate launch control? If you got that 60 foot time with PSM on, I would imagine that another tenth can be had on 60 foot as well as 1/4. I have a 7mt and wonder how much slower, if at all, it would be than pdk at a drag strip. Lastly, I'm assuming this track is at sea level or not much above? Congrats again and keep us updated when you dyno.
Curious, are the gear ratios identical on the PDK vs. the 7M? If so THAT will be interesting to see comparisons!
 
Old Apr 9, 2013 | 08:07 PM
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Originally Posted by hova00
Sorry for the late response but PSM was on
Thanks man!

On Saturday i took my car to Etown at Street Wars. I managed only two passes because it is too crowded. From te 1st to the 2nd pass it took 3 hours!!!

I weighted the car at the track with about 3/5 of a tank and driver at 3665 lbs. I weight 257 lbs...

I managed a 12.03 @ 115 with 1.79 60ft and a 12.1 @ 114.7 with 1.85 60ft...

Both runs with PSM on, which felt cutting the car too much... Maybe with PSM off it would allow for some spin which could potentially improve the 60ft...

09 Carrera 4S Launch car with AWE secondary muffler delete and 14K miles...

I might take it to the dragstrip once more to try with PSM off... That's why i asked... But my car is probably an elephant compred to the 991s...

The PDK cars have unbelievable performance!!!

 
Old Apr 10, 2013 | 11:23 AM
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iam sorry PSM was off and pasm-s was on. I got the two confused.
 
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