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Datsun A14-A15 Turbo Engine... What is the maximum ignition degree I can use ?
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2008/6/5 21:58
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Hello Guys What is the maximum ignition spark advance I can use ? on Datsun A15 Turbo Engine

I will Run with 10 to 15 PSI of boost

What range on ignition spark advance or retard is acceptable

This is my first Time tunning a turbo Engine, I appreciate you help

Regads, Dariel

Posted on: 10/11 15:58
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Re: Datsun A14-A15 Turbo Engine... What is the maximum ignition degree I can use ?
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Turbo A15 engine will last a long time ... if you limit spark advance, and the engine runs rich enough. What follows is a starting point ... however after you set it up, you must double check it to ensure there is no pinging


* For street driving/highway driving, keep the stock vacuum advance (it will have no effect under heavy throttle or boost, but will give better throttle response and fuel economy off-boost and while speeding up and slowing down)

* Connect vacuum advance up directly to manifold. This will help idle and starting out under low throttle, but the vacuum advance will have no effect under heavier throttle


* Start with initial timing to 3 degree BTDC instead of the usual 5-7 degrees


* For 15 lbs boost, limit the mechanical advance to 23 degrees (stock for A14/A15 is 32 degrees). In the distributor, weld the advance slots partially to limit mechanical advance (see Limiting Mechanical Advance)


Downside: On a forced-induction engine, the distributor advance won't be correct for varying boost levels. But you can set the advance for full boost ensuring safety, giving up HP and fuel economy for lower throttle conditions such as highway cruising. To get it perfect, use an ignition controller instead of the stock distributor

Posted on: 10/13 5:15
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Re: Datsun A14-A15 Turbo Engine... What is the maximum ignition degree I can use ?
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+1 for DD sugestion - You really should use some sort of ignition retarder to increasing boost controller other wise it will probably run like #OOPS#
dp

Posted on: 10/18 21:27
_________________
'79 B120 ute(TURBO EFI A15 + 60 ser.5spd )
'83 Clubman 7 ( TURBO EFI A15 + 63 ser.dog 5spd )
'73 KB110 Coupe Mild A15 5spd ( Quad carb revver soon)

keep it simple
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Re: Datsun A14-A15 Turbo Engine... What is the maximum ignition degree I can use ?
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Thanks you for the information

Posted on: 10/20 21:46
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