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Picture of CURTIS REED
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quote:
Originally posted by banjo:
quote:
Originally posted by CURTIS REED:
quote:
Originally posted by banjo:
Here are mine, Mine typically bump down.

Footbrake


Transbrake



Bill, am I reading right that you are shifting about 7500 and falling back to 7200ish?



No, shifts at 7000, falls back to 6200ish depending on the track.


Gotcha. I couldn't make out the line to rpm with everything displayed. thanks.



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Posts: 2988 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
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quote:
Originally posted by Mike Rietow:
This graph is interesting at the shift, in the car it probably feels like it shifts hard, but it looks like a mistimed shift on the driveshaft graph, like the band is slow to get off the drum.

Then when finally does, it spins the tire.

How much line pressure in gear, above 2000 rpm's?




No idea on line pressure. I will check the sensor tonight


--------------------
Bob Payton
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Posts: 1990 | Location: Michigan | Registered: November 14, 2001Reply With QuoteReport This Post
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posted Hide Post
quote:
Originally posted by Bob Payton:
quote:
Originally posted by Mike Rietow:
This graph is interesting at the shift, in the car it probably feels like it shifts hard, but it looks like a mistimed shift on the driveshaft graph, like the band is slow to get off the drum.

Then when finally does, it spins the tire.

How much line pressure in gear, above 2000 rpm's?




No idea on line pressure. I will check the sensor tonight


If the line pressure is high, it can make the band slow to get off the drum.

6.0's @ 2600-2800lbs 215 psi line pressure would be as high as I'd wanna run it.

Up around 260 psi it could possibly cause the band to be slow. Not saying that's what's going on, but it's something to take into consideration if a failure arises.

If it bangs real hard going into high, riding it around warming it up in the pits, when you shift it, I'd probably look in to it a little.
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
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Picture of adv ET 266
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Record the fall back RPM. Once you have enough data and plot a scatter diagram and fit a curve, you can use it to verify relative power independent of traction. Excellent help when sorting out an odd time slip or making tune up changes.



2005 2000lb 4 link dragster
home brew 582 BBC Dart 355
1.058
2.98
4.629@149
6.094
7.310@185

 
Posts: 12173 | Location: 33463 | Registered: February 04, 2004Reply With QuoteReport This Post
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