:::RHMT::: Real Home Made Turbo
General Category => Engine Management => Topic started by: 98vtec on February 02, 2010, 02:00:40 AM
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well this topic came up in my other thread but i wanted to get more of a discussion from it. All the engine managements (honda based at least) have a boost retard per psi which is pretty standard and needed but what variable has more of an effect on ignition timing? PSI or Horsepower? I would imagine horsepower has more of an effect since the more power the engine makes, the more work it has to do and therefore the more the timing has to be retarded. The same is true for turbo pressure but how does it compare to horsepower?
We all know that a smaller turbo on 10lbs is going to make less power than a larger turbo at the same pressure (given other variables are the same). So how is the ignition timing effected?
can this be related to the dynamic compression ratio when in boost? The higher the dynamic compression (increased boost) the more power it has the ability to make (witin the turbo limits) before reaching the knock limit.
discuss
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can this be related to the dynamic compression ratio when in boost? The higher the dynamic compression (increased boost) the more power it has the ability to make (witin the turbo limits) before reaching the knock limit.
discuss
answerd imho only thing that confuese me is how on the load dyno when in a vacume colum i can reach mbt add 2-3 deg before power dropps off. (platue or how ever you spell it) but when in boost i never get a platue i just make power till it drops 2-3 hp and add 1 more deg drop 5 bring back 2 degree's and be back up were i was. so i generaly from there remove another degree or so to compensate for if any ignition corrections that will add timing on me. ( off topic)
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well this topic came up in my other thread but i wanted to get more of a discussion from it. All the engine managements (honda based at least) have a boost retard per psi which is pretty standard and needed but what variable has more of an effect on ignition timing? PSI or Horsepower? I would imagine horsepower has more of an effect since the more power the engine makes, the more work it has to do and therefore the more the timing has to be retarded. The same is true for turbo pressure but how does it compare to horsepower?
We all know that a smaller turbo on 10lbs is going to make less power than a larger turbo at the same pressure (given other variables are the same). So how is the ignition timing effected?
can this be related to the dynamic compression ratio when in boost? The higher the dynamic compression (increased boost) the more power it has the ability to make (witin the turbo limits) before reaching the knock limit.
discuss
http://www.realhomemadeturbo.com/forum/index.php?topic=9841.0 (http://www.realhomemadeturbo.com/forum/index.php?topic=9841.0)
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The D16 ignition timing thread already covers this subject. With all engines being slightly to completely different, all the setup info and timing table screenshots I posted are either gold or as ultimately worthless as this thread.
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