Tooth Offset

This topic contains 12 replies, has 5 voices, and was last updated by Andre Simon Andre Simon 11 months, 3 weeks ago.

Viewing 13 posts - 1 through 13 (of 13 total)
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  • #3483
    Baber Hussain
    Baber Hussain
    Participant

    Hi Andre and Ben

    can you explain me in details on Tooth Offset setting in ECUs like Motec and Haltech

    for example like 2jz setup in Haltech sport , trigger setup if I put 10 tooth offset I get only 3 ignition fire and if change to 21 tooth offset I get 6 ignition fire

    how to chose perfect number of tooth offset for engines or triggers

    Baber Hussain Moroccan Garage Al Doha Street 17/ New Industrial Area Ajman Ajman United Arab Emirates P.O.Box 8304 Ajman Phone = 00971507977818 / 00971557977818 Email = bbrhamid@yahoo.com
    #3487
    Andre Simon
    Andre Simon
    Key Master

    Hi Baber,

    Motec and Haltech work in different ways. Motec use a function called Crank Index Position which defines the number of degrees between the REF index tooth and TDC for number 1 cylinder. Basically you tune this parameter to match the ignition timing to at the engine to what the laptop is displaying.

    Haltech works slightly differently in that the Tooth Offset allows you to choose the number of teeth between the home signal and the tooth that you want to use as the trigger tooth. You can think of this a s a kind of coarse adjustment for the ignition timing. The timing can then be finely adjusted using the Trigger Angle. The Tooth Offset needs to be adjusted in so that the Trigger Angle ends up between the largest ignition advance you expect to run, and the angle between trigger events.

    The base map for the 2JZ has a Tooth Offset of 10 and a Trigger Angle of 61. This should get you up and running.

    #3489

    SALtech
    Participant

    Hi Andre

    How about the Haltech E8 trigger/ignition setup for a Nissan S13 SR20det engine.. I find that when I lock timing it still fluctuates a bit when i rev it..

    I guess i dont really understand the tooth offset and the Nissan home signal settings or get the numbers right..

    Regards

    Steinar

    (Norway)

    #3491
    Baber Hussain
    Baber Hussain
    Participant

    Hi Andre thanks for reply

    in Tooth Offset of 10 and a Trigger Angle of 61 I can use only waste spark 1,2,3 coil out put work fine

    in Tooth Offset of 21 and Trigger Angle of 65 I get timing lock on 10 degree and can use sequential spark 1,2,3,4,5,6 work perfect

    Andre I don’t have any problem with running engine , I just want to know how to find out exact number of Tooth Offset

    for example if I have 2jzgte engine , there is 12 tooth on crank and 1 on cam , in 2 crank cycle  we get 1 cam cycle

    how I will find out Tooth Offset for this trigger setup , how to do calculation method

    Baber Hussain Moroccan Garage Al Doha Street 17/ New Industrial Area Ajman Ajman United Arab Emirates P.O.Box 8304 Ajman Phone = 00971507977818 / 00971557977818 Email = bbrhamid@yahoo.com
    #3492

    GRaF_ST205
    Participant

    There is no method to calculate these parameters before the engine start, it`s all about the experience of the man who do the initial setup. The exact number of the tooth offset is found by the timing light in a few minutes, there is no exact rule that you should make it 10 or 21 for your engine. But if you have the suspiction it shouldn`t be this way, you could check the crankshaft pulley TDC mark (in case of aftermarket crankshaft pulley, some China made pulleys have wrong marks), or the appropriateness of the camshaft install (the home trigger mark)

    #3502
    Baber Hussain
    Baber Hussain
    Participant

    thank you very much I understand now

    Baber Hussain Moroccan Garage Al Doha Street 17/ New Industrial Area Ajman Ajman United Arab Emirates P.O.Box 8304 Ajman Phone = 00971507977818 / 00971557977818 Email = bbrhamid@yahoo.com
    #3503

    GRaF_ST205
    Participant

    Welcome )

    #3545

    fullboost2008
    Participant

     whats the Tooth Offset and a Trigger Angle for a honda b16a2?

    Carlos Ramos Speed Shop
    #3548
    Andre Simon
    Andre Simon
    Key Master

    Try a tooth offset of 79 and a trigger angle of 9. This should have you close enough to get the engine running but you will need to confirm and adjust the trigger angle to suit.

    #3673

    fullboost2008
    Participant

    Hi Andre, ok car turns and keeps minimum but when accelerated to 2500 rpm starts misfiring like he was out of order, and i set the timing light to 10 degrees and still doing the same, maybe if I pass my map could help me?.

    Carlos Ramos Speed Shop
    #3678
    Andre Simon
    Andre Simon
    Key Master

    Post your map up here and I will try to help you out. I am travelling at the moment so getting regular forum access is a bit hit and miss right now.

    When you set the timing to 10 degrees, was it rock solid at 10 degrees when you rev the engine up?

    #3681

    fullboost2008
    Participant

    Andre i dont know if this is correct

     

    To put in place a Haltech Computer b16 timing light, honda has 2 marks 1 being the TDC 0 degrees and 2 mark which is 16 degrees BTDC , what I have understood in open computer is placed lock in 10 degrees, in this case how i do, I put the lock at 16 degrees?

    Carlos Ramos Speed Shop
    #3705
    Andre Simon
    Andre Simon
    Key Master

    Hey full boost,

    If you have the option, set the timing lock at 16 degrees and then you should align properly with the 2nd mark. Just remember that these engines rotate anticlockwise so the timing mark you are looking for is the left-most mark (16 degrees). If you can’t select 16 degrees, you can either use a dial back timing light where you can adjust the advance angle on the timing light or you can skip the actual ignition lock test and just set your entire ignition map to 16 degrees.

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