what do you run for total timing?? 32*, 34* 36*

Discussion in ''Da Nailhead' started by 66larkgs, Jan 7, 2013.

  1. 66larkgs

    66larkgs paul 66gs turbo nailhead

    been tuning the single turbo 401 nailhead and wanted to know what you guys are running for total timing.. right now i am running a MSD 6btm box with a msd dist with no vacuum advance and locked out mech advance. i am running a total or 34* and didnt know if anyone is running more than 34*. the a/f are wired up and will be running the motor with them on it tomorrow but wanted to pick some brains on what you are running for your tune. Thankyou
    i am running a 4150 CSU blow thru carb with ev hat and a1000 areomotive pump and boost reference fuel pump. i also have it setup to pull 1.5* degrees of timing per every lbs of boost.
    Paul
    66larkgs
    turbo 401 nailhead
     
  2. Bigpig455

    Bigpig455 Fastest of the slow....

    I run 34 if I've got the gas for it, power and ET's fell off at 36. However, car runs great at 32, even 30 isnt bad....
     
  3. doc

    doc Well-Known Member

    i would say 30/32..... but each engine is a individual,,,, just experiment with it and see what it tells you..... sometimes less is more.....
    :laugh:
     
  4. CameoInvicta

    CameoInvicta Well-Known Member

    I run 34* total, but that's so I can run more initial than any other reason.
     
  5. gsgtx

    gsgtx Silver Level contributor

    here we have 10% ethanol, with that blend you would need to add timing a few degrees.
     
  6. bobc455

    bobc455 Well-Known Member

    I had a unique opportunity with my car.

    I have programmable FI, so I have all kinds of flexibility.

    I ran the car on a dyno, and did back-to-back runs (about 15 pulls in the day). One of the interesting things I found was that below 4000RPM, the engine liked 35 degrees. Above 4000RPM, it likes 34 degrees. So that's what I programmed it to do.

    (If you ever get to do a dyno, don't just tune for peak HP or torque- compare all of the curves back-to-back and see how things get affected.)

    -Bob C.
     
  7. 66larkgs

    66larkgs paul 66gs turbo nailhead

    i ran the the motor a little bit today and set it for now at 32*. i am going to bump it up slowly but because i dont have a start retard hooked up yet it is still tough to start when hot. Spark plugs looked good and motor staied at 180 without the fan hookedup. i had a issue today with the waterpump and it was starting to make a slight bearing noise so i ordered a new one and will be getting that installed and continue working on getting and keeping a safe tune.
     

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