Go
New
Find
Notify
Tools
Reply
  
Shifter relay
 Login/Join
 
DRR Trophy
posted
I’m having problems about 3-4 times a year where the car shifts via the electric solenoid however it stays engaged until it starts smoking. Each time I have to replace the relay which seems to be sticking in the on position. I’ve tried different solenoids and brands of relays. The ground goes directly to the chassis and it’s clean. What can cause this or what am I missing.
 
Posts: 85 | Location: At the Stripe! | Registered: June 10, 2005Reply With QuoteReport This Post
DRR Pro
Picture of chasracer
posted Hide Post
Assuming you're talking about the 30 amp square relay? Make sure you have it wired correctly. The #30 terminal must go to the 12v power supply. The relay will operate if you have #30 and #87 swapped and in most cases you would probably never have a problem with it, but internally that will fry the contacts sooner.


Save on Fuel - GetUpside - https://upside.app.link/jE7eqmHc2z
 
Posts: 1135 | Location: The problem is not the problem. The problem is your attitude about the problem. Savvy?” ~~ Captain Jack Sparrow ~~ | Registered: August 21, 2000Reply With QuoteReport This Post
DRR Pro
Picture of Eman
posted Hide Post
What relay are you using and what amperage is it rated at? I've used Radioshack relays with no problems. Should be 30-40 amp rating.
 
Posts: 1443 | Location: E TN | Registered: February 13, 2009Reply With QuoteReport This Post
DRR Pro
posted Hide Post
What +12v output device is activating the shift? Is it activated on RPM or on Time?
 
Posts: 2389 | Location: 53056 | Registered: December 30, 2009Reply With QuoteReport This Post
DRR Trophy
posted Hide Post
Check with the manufacturer. I've used a few different styles/brands and a few of them require different size wire and relays. I just switched to a heavy duty solenoid from shifnoid and it requires a bigger wire and relay.
 
Posts: 67 | Location: Pittsburgh | Registered: December 11, 2016Reply With QuoteReport This Post
DRR Trophy
posted Hide Post
Reason contacts are failing is they are not rated for the amperage. I used one similar to the one at this URL. https://www.rakuten.com/shop/r...ical/product/67-702/
basically a tin can with two big high current connections and two smaller connections to apply 12 volts to. One grounded and the other to the control. Or flip it and tie one to 12v and switch the other to ground. To activate.
 
Posts: 92 | Location: North Carolina | Registered: April 04, 2003Reply With QuoteReport This Post
DRR Pro
Picture of CURTIS REED
posted Hide Post
Look at these relays. They are not as small as the little 30amp relays but are still more compact than the one posted above and are rated at 75 amps continuous. We use and sell these at my company but ours are special ordered as a double pole single throw.

https://www.delcity.net/store/...F3GtTuhoCr74QAvD_BwE



____________________________
2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion

2018 Div4 Goodguys Hammer award winner
 
Posts: 2889 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post



DRR Pro
Picture of Brktracer
posted Hide Post
MSD has a solid state relay available that has 4 relays built in at 20 amps per. You can wire two of them together for 40 amps. MSD Relay

I've considered ditching all of my mechanical relays.


Matt Ward



 
Posts: 1388 | Location: South Carolina | Registered: March 20, 2004Reply With QuoteReport This Post
DRR Trophy
posted Hide Post
I’m using the 7al3 ras to activate the relay/shifter. The relay is the one that comes with the solenoid. I think I’ll try the one listed above. Thanks.
 
Posts: 85 | Location: At the Stripe! | Registered: June 10, 2005Reply With QuoteReport This Post
DRR Pro
posted Hide Post
Here’s something to investigate. When you are doing your burnout, and “if” you are achieving the same rpm level the ras chip value is set to, you are activating the shift solenoid in the burnout also.

If you look at most RPM shifts on a data acquisition display, the shifter output is generally ON for no more the 0.30 seconds. Many as little as 0.15 – 0.20 seconds.

If it were me, I’d chose the relay Curtis listed.
 
Posts: 2389 | Location: 53056 | Registered: December 30, 2009Reply With QuoteReport This Post
DRR Pro
posted Hide Post
Is it fused? Until you get it figured out it would be cheaper to replace the fuse rather than the relay and/or Shift Solenoid...just a thought.


Dykes & Strippers Custom Wiring
Auto Meter Authorized Dealer
CleanYourTrailer.com
Horse Power Sales
USADragRacingChat.com
Fab Shop
Race Flow Development

245" Harry Clack
399 inches of Horse Power Sales Power
1.031, 2.978, 4.640 at 147.47
 
Posts: 492 | Location: Lebanon, OH | Registered: March 18, 2008Reply With QuoteReport This Post
  Powered by Social Strata  
 


© DragRaceResults.com 2024