Easy Drag Race Question A4
10-16-2011, 11:54 AM
#21
Melting Slicks
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St. Jude Contributor
I never go though the water nor do any burnout,just a short chirp before I stage.Power braking over 1000 rpm's has always hurt my ET.I think the computer senseses engine load with no rpm or speed gain and starts to retard timing.I dont fool with my tire pressures either,but I do use comp mode.
Well we had some cooler temps last wed (low 80's) and I ran my best ET yet at 12.77,not bad for a basically stock 04 coupe.How bout you sport?
10-18-2011, 05:39 PM
#24
Pro
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Launch technique is learned - power braking to load the T/C is a good idea, if the track is well prepped you could go full throttle at the third yellow light. If the track isn't prep very well or you have power adders, you'll need to roll into the throttle off the line. Good Luck and keep practicing.
Never mind on gear shifter position - I was bitch slapped!
Never mind on gear shifter position - I was bitch slapped!
Last edited by Vector; 10-20-2011 at 04:21 PM.
10-18-2011, 06:59 PM
#26
Melting Slicks
i was told to hold on when running my 382 with a 100 shot nitrous turned on in 1st gear at 4200rpm . launched at 1800rpm the stall flashed at 3400rpm and juice kicked in at about 15 to 20 ft out off the hole can you say 1.344 60ft time
10-19-2011, 10:01 PM
#28
Racer
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I always leave mine in "D" and launch off idle after a quick clean of the tires.... I tried "3" a couple times and the results were worse, however I did not pre-load the T/C
anyway with bolt ons and leaving it in "D" the car ran 12.4 @ 113mph (street tires, lowered tire pressure and comp mode one)
anyway with bolt ons and leaving it in "D" the car ran 12.4 @ 113mph (street tires, lowered tire pressure and comp mode one)
10-20-2011, 12:26 AM
#29
Race Director
Let me be completely honest and frank. Anyone telling you there is a difference in gear has no clue what they are talking about. None. I don't care if they've ran the car eleventy billion times, they are wrong. Any stories of different times due to one or the other is just random chance. Tires, rear end ratio, etc all matter nada. Period. End of story.
There is no difference between "3" or "D" in a drag race, and here's why.
It's all electronicaly controlled. For Wide Open Throttle (and who isn't going WOT for drag racing), the combination is very simple. Part throttle gets a little more complicated, because the table is driven by throttle position.
But WOT shift points are easy. It shifts gears at the mph set in the table and at the RPM set in the WOT table. Some may have heard about bouncing off the rev limiter for applications where a rear end ratio has been changed without being tuned. What happens is you redline the engine without hitting the mph set in the table, so the transmission won't shift, and the engine cuts off. That's why you need to get a tune after a rear end swap so these tables get updated.
Back to why there's no difference. For the stock program, the WOT Shift RPM is set at 6000RPM for 1->2 and 5900RPM for 2->3 and 3->4. You have to reach that RPM before the transmission will shift AND you also have to be at the mph set in the WOT shift speed table. For a stock program:
1->2 46mph
2->3 93mph
3->4 255mph
That's right folks. Unless you are going over 255mph, the computer will never let the tranny shift down into 4th on a WOT blast. Never.
Even when tuned for different rear end ratio, a good tuner is going to go back into those tables and adjust the scaled number back to 255. It's there as a safeguard. 4th can't handle the high power, it's an overdrive. Even scaled for 4.10s from 2.73, that value drops to 170mph. None of us are trapping 170. So even if a bad tuner just left the scaled numbers, you're still safe.
Sorry to be harsh, but I hate when misinformation gets perpetuated. Old school thought for automatic transmissions don't apply anymore.
There is no difference between "3" or "D" in a drag race, and here's why.
It's all electronicaly controlled. For Wide Open Throttle (and who isn't going WOT for drag racing), the combination is very simple. Part throttle gets a little more complicated, because the table is driven by throttle position.
But WOT shift points are easy. It shifts gears at the mph set in the table and at the RPM set in the WOT table. Some may have heard about bouncing off the rev limiter for applications where a rear end ratio has been changed without being tuned. What happens is you redline the engine without hitting the mph set in the table, so the transmission won't shift, and the engine cuts off. That's why you need to get a tune after a rear end swap so these tables get updated.
Back to why there's no difference. For the stock program, the WOT Shift RPM is set at 6000RPM for 1->2 and 5900RPM for 2->3 and 3->4. You have to reach that RPM before the transmission will shift AND you also have to be at the mph set in the WOT shift speed table. For a stock program:
1->2 46mph
2->3 93mph
3->4 255mph
That's right folks. Unless you are going over 255mph, the computer will never let the tranny shift down into 4th on a WOT blast. Never.
Even when tuned for different rear end ratio, a good tuner is going to go back into those tables and adjust the scaled number back to 255. It's there as a safeguard. 4th can't handle the high power, it's an overdrive. Even scaled for 4.10s from 2.73, that value drops to 170mph. None of us are trapping 170. So even if a bad tuner just left the scaled numbers, you're still safe.
Sorry to be harsh, but I hate when misinformation gets perpetuated. Old school thought for automatic transmissions don't apply anymore.
Last edited by nj02vette; 10-20-2011 at 12:50 AM.
10-20-2011, 12:36 AM
#30
Race Director
10-20-2011, 12:38 AM
#31
Safety Car
Member Since: Jun 2009
Location: Frederick, Maryland
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Let me be completely honest and frank. Anyone telling you there is a difference in gear has no clue what they are talking about. None. I don't care if they've ran the car eleventy billion times, they are wrong. Any stories of different times due to one or the other is just random chance. Tires, rear end ratio, etc all matter nada. Period. End of story.
There is no difference between "3" or "D" in a drag race, and here's why.
It's all electronicaly controlled. For Wide Open Throttle (and who isn't going WOT for drag racing), the combination is very simple. Part throttle gets a little more complicated, because the table is driven by throttle position.
WOT shift points are easy. It shifts gears at the mph set in the table and at the RPM set in the WOT table. Some may have heard about bouncing off the rev limiter for applications where a rear end ratio has been changed without being tuned. What happens is you redline the engine without hitting the mph set in the table, so the transmission won't shift, and the engine cuts off. That's why you need to get a tune after a rear end swap so these tables get updated.
Back to why there's no difference. For the stock program, the WOT Shift RPM is set at 6000RPM for 1->2 and 5900RPM for 2->3 and 3->4. You have to reach that RPM before the transmission will shift AND you also have to be at the mph set in the WOT shift speed table. For a stock program:
1->2 46mph
2->3 93mph
3->4 255mph
That's right folks. Unless you are going over 255mph, the computer will never let the tranny shift down into 4th on a WOT blast. Never.
Sorry to be harsh, but I hate when misinformation gets perpetuated. Old school thought for automatic transmissions don't apply anymore.
There is no difference between "3" or "D" in a drag race, and here's why.
It's all electronicaly controlled. For Wide Open Throttle (and who isn't going WOT for drag racing), the combination is very simple. Part throttle gets a little more complicated, because the table is driven by throttle position.
WOT shift points are easy. It shifts gears at the mph set in the table and at the RPM set in the WOT table. Some may have heard about bouncing off the rev limiter for applications where a rear end ratio has been changed without being tuned. What happens is you redline the engine without hitting the mph set in the table, so the transmission won't shift, and the engine cuts off. That's why you need to get a tune after a rear end swap so these tables get updated.
Back to why there's no difference. For the stock program, the WOT Shift RPM is set at 6000RPM for 1->2 and 5900RPM for 2->3 and 3->4. You have to reach that RPM before the transmission will shift AND you also have to be at the mph set in the WOT shift speed table. For a stock program:
1->2 46mph
2->3 93mph
3->4 255mph
That's right folks. Unless you are going over 255mph, the computer will never let the tranny shift down into 4th on a WOT blast. Never.
Sorry to be harsh, but I hate when misinformation gets perpetuated. Old school thought for automatic transmissions don't apply anymore.
10-20-2011, 11:52 AM
#32
Melting Slicks
Member Since: Jun 2010
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Let me be completely honest and frank. Anyone telling you there is a difference in gear has no clue what they are talking about. None. I don't care if they've ran the car eleventy billion times, they are wrong. Any stories of different times due to one or the other is just random chance. Tires, rear end ratio, etc all matter nada. Period. End of story.
There is no difference between "3" or "D" in a drag race, and here's why.
It's all electronicaly controlled. For Wide Open Throttle (and who isn't going WOT for drag racing), the combination is very simple. Part throttle gets a little more complicated, because the table is driven by throttle position.
But WOT shift points are easy. It shifts gears at the mph set in the table and at the RPM set in the WOT table. Some may have heard about bouncing off the rev limiter for applications where a rear end ratio has been changed without being tuned. What happens is you redline the engine without hitting the mph set in the table, so the transmission won't shift, and the engine cuts off. That's why you need to get a tune after a rear end swap so these tables get updated.
Back to why there's no difference. For the stock program, the WOT Shift RPM is set at 6000RPM for 1->2 and 5900RPM for 2->3 and 3->4. You have to reach that RPM before the transmission will shift AND you also have to be at the mph set in the WOT shift speed table. For a stock program:
1->2 46mph
2->3 93mph
3->4 255mph
That's right folks. Unless you are going over 255mph, the computer will never let the tranny shift down into 4th on a WOT blast. Never.
Even when tuned for different rear end ratio, a good tuner is going to go back into those tables and adjust the scaled number back to 255. It's there as a safeguard. 4th can't handle the high power, it's an overdrive. Even scaled for 4.10s from 2.73, that value drops to 170mph. None of us are trapping 170. So even if a bad tuner just left the scaled numbers, you're still safe.
Sorry to be harsh, but I hate when misinformation gets perpetuated. Old school thought for automatic transmissions don't apply anymore.
There is no difference between "3" or "D" in a drag race, and here's why.
It's all electronicaly controlled. For Wide Open Throttle (and who isn't going WOT for drag racing), the combination is very simple. Part throttle gets a little more complicated, because the table is driven by throttle position.
But WOT shift points are easy. It shifts gears at the mph set in the table and at the RPM set in the WOT table. Some may have heard about bouncing off the rev limiter for applications where a rear end ratio has been changed without being tuned. What happens is you redline the engine without hitting the mph set in the table, so the transmission won't shift, and the engine cuts off. That's why you need to get a tune after a rear end swap so these tables get updated.
Back to why there's no difference. For the stock program, the WOT Shift RPM is set at 6000RPM for 1->2 and 5900RPM for 2->3 and 3->4. You have to reach that RPM before the transmission will shift AND you also have to be at the mph set in the WOT shift speed table. For a stock program:
1->2 46mph
2->3 93mph
3->4 255mph
That's right folks. Unless you are going over 255mph, the computer will never let the tranny shift down into 4th on a WOT blast. Never.
Even when tuned for different rear end ratio, a good tuner is going to go back into those tables and adjust the scaled number back to 255. It's there as a safeguard. 4th can't handle the high power, it's an overdrive. Even scaled for 4.10s from 2.73, that value drops to 170mph. None of us are trapping 170. So even if a bad tuner just left the scaled numbers, you're still safe.
Sorry to be harsh, but I hate when misinformation gets perpetuated. Old school thought for automatic transmissions don't apply anymore.
Good info
07-31-2012, 11:30 PM
#34
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Cruise-In II Veteran
Not sure how I ran across this old thread...
08-01-2012, 12:24 AM
#35
Team Owner
