Author Topic: Electronics Luddite needs wiring help. Lions, and Tigers, and Feedback, oh my!  (Read 236 times)

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Offline SpeedyPetey660

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  • Posts: 5
    • Montana Dodge Boys
I changed our air-shifted Jerico to be fired by a solenoid instead of a pneumatic button.
The solenoid will be triggered by ground through a relay.

The reason for the change is that our sponsor (an 80-yr-old rookie in a 230+ mph lakester) is driving the car at Speedweek (209.721 MPH record) and initially wants the car to shift automatically so he has one less thing to worry about as he gets a feel for the car.

Therefore, one trigger will be the 700 MA ground signal from the RacePak data logger RPM output (I'll raise the shift points as the week progresses), and the other will be a manual override trigger on the steering wheel, both through a relay.

I need help with-
1. Wiring the relay to trigger from a ground and send a ground signal.
2. More importantly, in testing the solenoid by simply jumping to the ground on the solenoid, I am getting feedback through the entire wiring system. I know this because the Air/Fuel module reset light blinks when I fire the solenoid. Not a good thing for clean data.
3. I assume this means I need diode(s), but I'm at a loss about where to place them in the system.

I don't know why I'm having so much trouble wrapping my head around this, but dammit Jim, I'm a fabricator/mechanic, not an electrician.

Thanks in advance, Pedro
« Last Edit: February 29, 2024, 06:01:18 PM by SpeedyPetey660 »
MONTANA DODGE BOYS
1928 DODGE V4/V4F ROADSTER
278" BLOWN ARDUN XXF LAKESTER

RECORDS
2023 El Mirage
XXF/BGL 196.815 MPH
XXF/BGL 193.603 MPH
2022 El Mirage
XXF/BGL 193.436 MPH
2021 Bonneville
XXF/BFL 230.829 MPH
XXF/BGL 209.721 MPH
2017 Bonneville
V4F/BFMR 150.141 MPH
V4F/BFR 144.091 MPH
2016 El Mirage
V4F/BGMR 140.961 MPH
V4F/BFMR 147.629 MPH
2013 Bonneville
V4F/BGMR 142.956 MPH
V4F/BGR 138.395 MPH
V4F/BFMR 143.254 MPH
V4F/BFR 138.984 MPH
2012 Bonneville
V4F/BGMR 130.843 MPH
2010 Bonneville
V4F/BSTR 127.352 MPH
2009 Bonneville
V4F/STR 115.681 MPH
V4F/GR 116.439 MPH
V4F/FR 117.597 MPH
2008 Bonneville
V4F/STR 109.962 MPH

Offline ronnieroadster

  • Sr. Member
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  • Posts: 973
  To get the relay to operate you need the ground voltage source to have an amperage output that's high enough to work the relay. Your wrote a 700 MA
ground signal as one trigger. If your trying to light an LED indicator 700 MA should work BUT it seems 700MA is way to low to pick up a relay.

 However I question the idea of changing how the Jerico shifts for a single driver no matter the age.  A driver should have a feel for every thing involved with driving the car! Any rookie driver driving my car is expected to learn the features of the car we don't reinvent the wheel. Just my thoughts.
 Ronnieroadster
Working in the shop I use the 'F' word a lot. No not that word these words Focus and Finish go Fast and Flathead Ford!
 ECTA  XF/BGRMR Record 179.8561
 LTA    XF/BGRMR  Record 200.921 First  Ever Ford Flathead Roadster to hit 200 MPH burning gasoline July 2018
 SCTA  XF/BGRMR Record 205.744  First gas burning Ford flathead powered roadster to top 200 MPH at Bonneville August 7, 2021 top speed 219.717
 SCTA  XXF/BGRMR Record 216.131 plus a Red Hat
"Life Member of the Bonneville 200 MPH Club"

Offline SpeedyPetey660

  • New folks
  • Posts: 5
    • Montana Dodge Boys
However I question the idea of changing how the Jerico shifts for a single driver no matter the age.  A driver should have a feel for every thing involved with driving the car! Any rookie driver driving my car is expected to learn the features of the car we don't reinvent the wheel. Just my thoughts.
 Ronnieroadster


Speaking from experience, switching from an upright roadster or coupe to a special construction car is really intimidating. 550 HP 3" behind your head, laying back in a seat, 7 point belts, your butt 3" from the ground, 1/4 turn lock to lock, thicker fire suit, claustrophobia, a parachute, etc aren't things you can practice for without doing it firsthand.
If the guy writing the checks wants automatic shifting to shorten the learning curve, the guy writing the checks gets automatic shifting.
RacePak Tech assured me that the rpm output will be sufficient to fire the relay.
MONTANA DODGE BOYS
1928 DODGE V4/V4F ROADSTER
278" BLOWN ARDUN XXF LAKESTER

RECORDS
2023 El Mirage
XXF/BGL 196.815 MPH
XXF/BGL 193.603 MPH
2022 El Mirage
XXF/BGL 193.436 MPH
2021 Bonneville
XXF/BFL 230.829 MPH
XXF/BGL 209.721 MPH
2017 Bonneville
V4F/BFMR 150.141 MPH
V4F/BFR 144.091 MPH
2016 El Mirage
V4F/BGMR 140.961 MPH
V4F/BFMR 147.629 MPH
2013 Bonneville
V4F/BGMR 142.956 MPH
V4F/BGR 138.395 MPH
V4F/BFMR 143.254 MPH
V4F/BFR 138.984 MPH
2012 Bonneville
V4F/BGMR 130.843 MPH
2010 Bonneville
V4F/BSTR 127.352 MPH
2009 Bonneville
V4F/STR 115.681 MPH
V4F/GR 116.439 MPH
V4F/FR 117.597 MPH
2008 Bonneville
V4F/STR 109.962 MPH

Offline SpeedyPetey660

  • New folks
  • Posts: 5
    • Montana Dodge Boys
I got my answer. Thank you!
MONTANA DODGE BOYS
1928 DODGE V4/V4F ROADSTER
278" BLOWN ARDUN XXF LAKESTER

RECORDS
2023 El Mirage
XXF/BGL 196.815 MPH
XXF/BGL 193.603 MPH
2022 El Mirage
XXF/BGL 193.436 MPH
2021 Bonneville
XXF/BFL 230.829 MPH
XXF/BGL 209.721 MPH
2017 Bonneville
V4F/BFMR 150.141 MPH
V4F/BFR 144.091 MPH
2016 El Mirage
V4F/BGMR 140.961 MPH
V4F/BFMR 147.629 MPH
2013 Bonneville
V4F/BGMR 142.956 MPH
V4F/BGR 138.395 MPH
V4F/BFMR 143.254 MPH
V4F/BFR 138.984 MPH
2012 Bonneville
V4F/BGMR 130.843 MPH
2010 Bonneville
V4F/BSTR 127.352 MPH
2009 Bonneville
V4F/STR 115.681 MPH
V4F/GR 116.439 MPH
V4F/FR 117.597 MPH
2008 Bonneville
V4F/STR 109.962 MPH

Offline SpeedyPetey660

  • New folks
  • Posts: 5
    • Montana Dodge Boys
"However I question the idea of changing how the Jerico shifts for a single driver no matter the age.  A driver should have a feel for every thing involved with driving the car! Any rookie driver driving my car is expected to learn the features of the car we don't reinvent the wheel. Just my thoughts."

Speaking from experience, switching from an upright roadster or coupe to a special construction car is really intimidating, regardless of age or experience. 550 HP 3" behind your head, laying back in a seat, 7 point belts, your butt 3" from the ground, 1/4 turn lock to lock, thicker fire suit, claustrophobia, heat, a parachute, visibility, peripheral vision, feel for tire spin 13' behind you, etc. aren't things you can practice for without doing it firsthand.
If the guy writing the checks wants automatic shifting to shorten the learning curve, the guy writing the checks gets automatic shifting.
I was concerned about the RacePak output as well, but their tech assured me that the 700 mA output will be sufficient to fire the relay.
Thanks, Pete
MONTANA DODGE BOYS
1928 DODGE V4/V4F ROADSTER
278" BLOWN ARDUN XXF LAKESTER

RECORDS
2023 El Mirage
XXF/BGL 196.815 MPH
XXF/BGL 193.603 MPH
2022 El Mirage
XXF/BGL 193.436 MPH
2021 Bonneville
XXF/BFL 230.829 MPH
XXF/BGL 209.721 MPH
2017 Bonneville
V4F/BFMR 150.141 MPH
V4F/BFR 144.091 MPH
2016 El Mirage
V4F/BGMR 140.961 MPH
V4F/BFMR 147.629 MPH
2013 Bonneville
V4F/BGMR 142.956 MPH
V4F/BGR 138.395 MPH
V4F/BFMR 143.254 MPH
V4F/BFR 138.984 MPH
2012 Bonneville
V4F/BGMR 130.843 MPH
2010 Bonneville
V4F/BSTR 127.352 MPH
2009 Bonneville
V4F/STR 115.681 MPH
V4F/GR 116.439 MPH
V4F/FR 117.597 MPH
2008 Bonneville
V4F/STR 109.962 MPH