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DRR Pro |
Shift Problem ? Red line is last year 2018. Green line is this year first time out. Same trans and convertor from last year. Got progressively worse over 2 days and this is the last run (green line). Shift Output (electric solenoid shifter) was on for approximately 0.20 seconds all runs 2018 – 2019. 4.9x dragster. Spragless Convertor. Opinions….. | ||
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DRR Trophy |
Change you electric solenoid on the shifter. | |||
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DRR Pro |
Issue occurred at the same spot each pass. Grid shows shift output time same all passes but car does not complete the shift in the same duration Ryan Fasano 2014 Byron Overall Track Champion Byron's actual elevation is 730' because that matters more than winning anything ever.... | |||
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DRR Sportsman |
Same fluid? Trans temp? Configuration: 3350#, 582 C.I., 60 - 1.24 1/8 - 5.53@ 126MPH 1/4 - 8.73@ 159MPH 3700#+210lb driver, FULL interior, through mufflers, 10.5 tire. 60'-1.333 (IN 4000ft DA! Joisy Math excluded; 1.25sec using JOISY MATH.) 1/4 - 9.60@144MPH | |||
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DRR Pro |
You can try a run where you manually shift to see if it is a shifter or transmission problem. Crew Chief Pro 7.980. It is not an evolution in Crew Chief Software, it is a Revolution in Crew Chief Software Drag Racing Software and Professional Weather Stations(309) 688-2990 Visit us on the web at http://www.crewchiefpro.com Are you a Producer or a Parasite? Author of the book, "But Who Will Save The Children." | |||
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DRR Pro |
Same fluid, no idea the trans temp however this just carried over the next day as getting progressively worse meaning the first run sunday was a little more aggressive of a spike vs the last run Saturday so i doubt its heat related.. Ryan Fasano 2014 Byron Overall Track Champion Byron's actual elevation is 730' because that matters more than winning anything ever.... | |||
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DRR Sportsman |
Have you checked the shifter cable? Maybe it's gotten sloppy and is having trouble finding/engaging high gear. Park and low are easy to find, but the middle gears can be a challenge when the cable is worn. 72 Nova "Hooptie" | |||
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DRR Pro |
I have checked the cable in 1sr/2nd gear and park. I also put it in gear and cycled the solenoid and then checked the cable again. There is some slop but how much is too much? 1/4” play or 3/4” ??? Ryan Fasano 2014 Byron Overall Track Champion Byron's actual elevation is 730' because that matters more than winning anything ever.... | |||
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DRR Sportsman |
Make sure the shifter is not getting sticky. In both the cars we race I removed the detent spring that hold roll pin in the notches between gears. Makes moving the shifter thru gears much easier but still functions fine and safe. Secondly make sure your power supply is good and strong. What is the voltage run to run saying in logs? You should be so you know be able to overlay them as well. Mine is just a blip in voltage on shift. Check that and see if the solenoid is laboring, drawing more. | |||
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DRR Sportsman |
Sounds like you got that covered then. Trying to make sure its not something easily overlooked. As far as how much is too much? Depends on a lot of variables. I have seen some shifters that have a lot and work fine, others that won't shift right with a little. (that probably didn't answer your question though) Any chance it's spinning on the gear change? 72 Nova "Hooptie" | |||
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DRR Pro |
Its a 4.90 dragster so not spinning.... i would hope not. The battery voltage goes from solid 17.8v and during shift drops to 16.4. This is consistent on all runs Ryan Fasano 2014 Byron Overall Track Champion Byron's actual elevation is 730' because that matters more than winning anything ever.... | |||
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DRR Pro |
I was told, this trans was removed and replaced with a spare trans and tested on stands. Has not been track tested yet. This trans removed was disassembled and nothing out of the ordinary found with 120 runs on this trans. It still appears to be new inside. Here’s my question. Given that all the DA rpms look to be smooth prior to and after the shift was completed, is there any possibility that the convertor could cause this? | |||
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DRR Sportsman |
Can you put car in first and trigger solenoid with test function in grid to see how quickly it pushes shifter. It should be nearly instant. On cars I've seen the solenoid labor and move it slowly. The above fixed it. This would rule out several things. | |||
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DRR Pro |
I have tried that but not running. The test function is activated when ignition is triggered on Ryan Fasano 2014 Byron Overall Track Champion Byron's actual elevation is 730' because that matters more than winning anything ever.... | |||
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DRR Pro |
Update: found a broken sealing ring on the servo just now. This applies the band so that makes sense here. Ryan Fasano 2014 Byron Overall Track Champion Byron's actual elevation is 730' because that matters more than winning anything ever.... | |||
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DRR Top Comp |
Glad you found it please let us know after you track test to verify. https://postimg.cc/gallery/np3zpruo/ "Dunning-Kruger Effect" -a type of Cognitive bias where people with little expertise or ability assume they have superior expertise or ability. This overestimation occurs as a result of the fact that they do not have enough knowledge to know they don't have enough knowledge. Before you argue with someone ask yourself, "Is this person mentally mature enough to grasp the concept of a different perspective?" If not there is no point to argue. 4X NE2 CHAMPION. 2020 TDRA NE2 Champion | |||
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