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Tach on an EFI engine

Discussion in 'Daihatsu Hi jet' started by greg0187, Aug 13, 2008.

  1. greg0187

    greg0187 Moderator Staff Member

    If you've got one i'd like to know how to do it.

    Thanks,
    Greg
     
  2. myhijet

    myhijet Member

    I was thinking, if there are individual spark coils, why not use a 1 cyl tach?
     
  3. greg0187

    greg0187 Moderator Staff Member

    I know. Of course I had to get the Tach that only works for 2,3,4,5,6,8,10 cyl. I almost got the one with the inductive pickup but that wouldn't have even helped.
     
  4. myhijet

    myhijet Member

    My cousin in VA has a 3 cyl bike. My experience with motorcycles is limited but is there an angle there?

    Also, the spark pickup on my 97 is in the center of the top timing belt cover, between the cam and crank with the connector pointing toward the front. Could that be a place to get the 3 pulses required for the 3 cyl setting of your tach?

    Another thought, I had a digital volt meter that had a frequency setting. Wish I hadn't let the smoke out of that one.
     
  5. greg0187

    greg0187 Moderator Staff Member

    I'm not sure about the bike but I did think about the camshaft sensor you are talking about. I have a frequency counter I can connect to it. It may be the only option.

    -Greg
     
  6. Mighty Milt

    Mighty Milt Moderator

    greg did you try the brain box in the dash?
     
  7. greg0187

    greg0187 Moderator Staff Member

    I pulled it out last night. Its just a hodge-pauge of wires w/o any clue to what is what, and it doesn't look anything like what was posted on the DaiClub website. I assume it will be a wire not connected to anything, but that is going to be a challenge.

    -Greg
     
  8. greg0187

    greg0187 Moderator Staff Member

    BTW. Has anyone ever seen a Daihatsu truck with an OEM Tach? Weather it be a truck, van, or deck van? My searches come up with nothing.

    -Greg
     
  9. greg0187

    greg0187 Moderator Staff Member

    Well...I called Leon at Daihatsu help today. I kind of figured the newer models were out of his ream, but I figured I'd give him a try anyway. No dice. Nice guy though, and he was willing to help however he could. So anyway.... I got out my logic probe and started taping the wires at the ECU. I'm getting a negative pulse from the camshaft position sensor at the ECU so as long as the tach is a high resistance circuit it should work OK. Actually its the only wire I tapped into. I haven't tried the tach yet but I'm confindent that it will work. When I try it out, if it works, I'll make a pinout of the ECU and where to make the connections so everyone else will know.

    Cheers,
    -Greg
     
  10. Mighty Milt

    Mighty Milt Moderator

    good job greg!! forge a path for us to follow...

    i'm not hi-tech like that, i would have just put the green wire to each terminal till i got th needle to move... like i said, i'm just a dumb welder :rolleyes:
     
  11. greg0187

    greg0187 Moderator Staff Member

    Actually....I looked alittle further and found what I believe to be the actual tach output. I didn't want to probe around too much risking damage to the ECU. I'm still planning on posting the wiring meanwhile heres a pic of the install location. The only thing I regret is that its not a CP2010 (Black face). I mounted it to the pillar just below the hand grip. I had to fabricate a new mounting bracket out of 1/2" flat steel, the OEM was way too large.

    -Greg
    [​IMG]
     
  12. Mighty Milt

    Mighty Milt Moderator

    so, does it work? what kind of rpms are you turning?
     
  13. greg0187

    greg0187 Moderator Staff Member

    I works OK. I wouldn't go over 7K RPM, 6K seems to be a good shift point...at least thats I set the shift light.

    -Greg
     
  14. Wolfman

    Wolfman Member

    I don't know if the EFI engines were reworked or not, but I remember Leon telling me that the valves start to float in the Hijet at 5800 RPM in the 660cc carb engines.
     
  15. greg0187

    greg0187 Moderator Staff Member

    The EF-VE engine shows max HP at 5900. My guess is that redline is not too far past that. Redline is probably in the 6500-6800 range. Its just a guess though.
     
  16. greg0187

    greg0187 Moderator Staff Member

    I finished installing the Tach today from its temporary connections. I found what I believe is the best place. All the connections can be made to the harness that plugs into the instrument cluster behind the dash. Although it requires a little extra effort to get the cluster out, you don't have wires running all over the place, plus I only used 12 inches of wire from the tach. Let me know if anyone needs any specific instructions for removing the cluster. Color codes for connections are as follows.

    Ignition ON - Light Green
    Ground - Light Blue
    Illumination - Red w/Blue stripe
    Tach Signal - Red w/Yellow stripe (Same at ECU)

    -Greg
     
    Mighty Milt likes this.
  17. greg0187

    greg0187 Moderator Staff Member

    OK. Here's the deal. The tach says that idle speed is 1100-1200 RPM at the 3 cylinder setting. There's no way the motor is turning this at idle, I don't want to sound like a dumb *** but i've worked on enough motors to know. I've read... that some tachs have a calibration adjustment but this one doesn't have one (Accessible anyway). I'm quite sure that I connected to the correct tach signal because it goes to the instrument cluster and there's not even a contact on the circuit board. My guess is that its the inaccuaracy of the tach itself. It has a 10 switch dip switch bank to set the number of cylinders. I tried some different settings and found that the #3 dip switch and the #4 dip switch turned to the on position showed 850 RPM at idle which is what I believe is close to what it should be at. This setting is not in the documentation that came with the tach so my guess is that it could be used to calibrate it???? It didn't seem to change the full range RPM indication except for the initial 300RPM. I just though I'd let you guys (Milt) know.

    -Greg
     
  18. Mighty Milt

    Mighty Milt Moderator

    beneath the driver's seat decklid i found a sticker... i couldn't get a picture of it because of the glare off a metallic sticker but it has the engine specs.

    one of them (keep in mind it's japanese) is 900... i'm assuming that's the idle rpm, i've seen enough of these stickers to guess what each number means. there is also a setting for the intake and exhaust valves and the air conditioning 134a and what the emissions readings should be.

    thanks for the heads up greg, i'll keep that in mind when and if i get a tach. sometimes it's better not knowing. today on my ride home when the a/c died, i had a lot more power to hammer down... i had the speedo needle burried. i was somewhere between 145 & 150 and don't want to know what rpm i was turning... it sounded good though.
     
  19. greg0187

    greg0187 Moderator Staff Member

    A/C is nice to have but sometimes I'm glad that I don't have the "Rob Horspower" button on the dash. The most desirable reason to have it is for defogging the windscreen, one thing I didn't think about when I got mine. Thanks for the RPM indication. From what I've seen..the RPM changes based on the electrical load on my engine. With the headlights or parking lights on the RPM increases by 100. Thats why I figured about 850.

    -Greg
     
  20. Mighty Milt

    Mighty Milt Moderator

    here in arizona a/c isn't for comfort, it's for survival :eek:
     

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