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Thottle switch?

Discussion in '365 GT4 2+2/400/412' started by SouthJersey400i, Sep 30, 2007.

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  1. SouthJersey400i

    SouthJersey400i Formula 3

    Mar 14, 2007
    1,679
    Romulus, NY (Finger Lakes)
    Full Name:
    Ken Battle
    #1 SouthJersey400i, Sep 30, 2007
    Last edited by a moderator: Sep 7, 2017
    Here is a picture of a switch that I do not understand its function. What is its purpose? Does it kick down the transmission to accelerate? My switch is adjusted fully away from the throttle lever, so that it takes about 90% throttle opening before the micro switch is made. It can be adjusted much closer to the lever. What is the correct adjustment / procedure?
    Ken
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  2. markcF355

    markcF355 F1 Rookie

    Jun 6, 2004
    3,493
    Schmeckelstan
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    Mark
    #2 markcF355, Sep 30, 2007
    Yep, that's the kick down switch. It shifts the trans from 3rd down to 2nd.
     
  3. SouthJersey400i

    SouthJersey400i Formula 3

    Mar 14, 2007
    1,679
    Romulus, NY (Finger Lakes)
    Full Name:
    Ken Battle
    #3 SouthJersey400i, Oct 1, 2007
    Mark
    I thought so because mine does not kick down! I use the shifter when needed. What is the correct adjustment procedure? or is it "adjust to taste", like an Italian recipe?
    Ken
     
  4. markcF355

    markcF355 F1 Rookie

    Jun 6, 2004
    3,493
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    Mark
    #4 markcF355, Oct 2, 2007
    It sounds like yours is setup OK. It should kick in near WOT.
     
  5. SouthJersey400i

    SouthJersey400i Formula 3

    Mar 14, 2007
    1,679
    Romulus, NY (Finger Lakes)
    Full Name:
    Ken Battle
    #5 SouthJersey400i, Oct 2, 2007
    Mark (and Dave)
    Once again I must not be driving hard enough. I never accused myself of that in previous cars but twice now in this one.
    Ken
     
  6. moserpe

    moserpe Karting

    Jul 20, 2006
    137
    Switzerland
    Full Name:
    Peter Moser
    #6 moserpe, Oct 11, 2007
    Ken,

    mine did not change gear as well although the microswitch was set correctly. Reason: The microswitch itself did not close the contact. To check, simply disconnect a cable and measure the resistance with open and closed contact.
    I could not find an identical replacement but one with the same contacts inside which I then transplanted to the old one. Now it shifts down at (or near) WOT.

    Peter
     
  7. SouthJersey400i

    SouthJersey400i Formula 3

    Mar 14, 2007
    1,679
    Romulus, NY (Finger Lakes)
    Full Name:
    Ken Battle
    #7 SouthJersey400i, Oct 12, 2007
    Peter
    That will be easy to check. I adjusted mine to switch a bit short of WOT and it seemed to kick in and out, like a faulty switch. I'll know more this weekend.
    Thanks
    Ken
     
  8. SouthJersey400i

    SouthJersey400i Formula 3

    Mar 14, 2007
    1,679
    Romulus, NY (Finger Lakes)
    Full Name:
    Ken Battle
    #8 SouthJersey400i, Oct 14, 2007
    Peter
    I checked the switch in the car with the wires connected and the contacts appeared to be closed all of the time. When I disconnected the wires and removed the switch from the car the switch worked perfectly. Both the NO and NC contacts switched on moving the lever. After reinstalling I found it was back to closed all of the time. So I disconnected the wires and found the switch was still good, but the red and white wires were a "closed circuit" when using the beeper on my multi-meter. The closed switch gave 0.0 ohms but the red to white wire showed 12.8 ohms when not connected to the switch. Not knowing what is on the other end of the wires, I'm not sure this is correct. Anyone have similar experience or know if this resistance could be correct?

    I had the car out to go to a wonderful lunch today with the FCA Penn-Jersey region today. Nice event! I gave the kick-down a test and it seemed to work but at more throttle opening than is to my liking. So I think the switch and circuit are okay and I will make a small adjustment to kick down a bit sooner.
    Ken
     
  9. moserpe

    moserpe Karting

    Jul 20, 2006
    137
    Switzerland
    Full Name:
    Peter Moser
    #9 moserpe, Oct 15, 2007
    Hi Ken,

    Your analysis seems to be correct. The resistance you measure with the wires connected is the coil in the transmission which operates the valve for the kick-down function. This is why I had suggested to check the switch with the wires disconnected. With the adjustment of the position of the switch, you can - within certain limits- adjust the kick-down throttle position to your liking.

    Peter
     
  10. jacques

    jacques Formula Junior

    May 23, 2006
    877
    Los Angeles/Florida
    #10 jacques, Oct 15, 2007
    The switch when ordering..is a..Snap Action Switch..Made by Philmore..marketed by LKG Industries.com..Rockford, IL..$10-$15Us.. and is Normally Closed..available in several different roller-arm configs....LKG ph.# 1-815-230...ask for Steve if you have questions...the heat fries the guts of these things..so buy two...You are sooo welcome...Jacques..see their catalogue on-line...
     

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