pistonsuk

i wanted to get some timing values for 93 octane in my extended port fd engine, with t78, FMIC w/e6k.
what leading timing are you guys running at: 0, 5, 10, 15, and 20psi respectively?
what about trailing? i set my trailing above 6psi to 12deg. b/c i have my j/s set to max 10deg. retard and i dont want it to pass up the leading.
thanks,
justin

pistonsuk

i currently am running 32deg at 0psi and linerarized to 14deg at 15psi. i am running intake temps within 10-15deg of ambient and 10-11 AFR under boost. my trailing split is increased from 4deg at 0psi, 10deg at 8psi and about 14 around 15psi (range 2 above 2000).
seems to be good so far.
let me know what u guys are running, where are the greatest power gains?
justin

88fc3sw/HX83

That's some good info, who did the tuning? Is your car FULLY tuned? I'm running about 2 degrees more advanced than you and I was told mines was conservative.

pistonsuk

who did your tuning?
do you have 2degs everwhere from 0 to 15psi?
what about your trailing split?
do you have a knock sensor? sometimes i get a few of the LED's to show up(microphone is picking up something, doesnt feel like detination but maybe dangerous still???) near 0psi (under light load) my AFR's are usally near 12.5-13.5 here.
i have since backed off my timing to 30deg @ 0psi and linerarized that to 14deg at 15psi. and increased ny split from 3deg to 5 near 0psi. neither of these really helped so i might disregaurd the sensor and put my timing back or even more advanced if yours is.
i am planning on putting it on a dyno this Apr. at something that rx7revolution is putting together in Indy. i think there will be a dyno there. so no it is far from FULLY tuned.
thanks
justin

pistonsuk

anyone with an e6k on a turbo 13b should be able to answer these questions? whats up?
i have since put my timing back to the original settings i mentioned and have backed the sensitivity of the (J&S) knock sensor off a tad. it is now between 30-40% of its sensetivity range. is this about normal for a 13b w/ the sensor on the rear rotor housing? it seems to have takin care of the leds liteing under lite load.
i appreciate it, 88fc3sw/HX83
thanks,
justin

RETed

Are you talking about total advance or are you reading the degrees solely off the ignition map with your reference base timing set elsewhere than TDC?&nbsp Most rotary guys shoot for 5 degrees ATDC, since these are the marks on the stock pulleys.&nbsp If you're doing this, then reading degrees straight off the map is off by 5 degrees versus total advance.

Rotary ignitions are one of the most closely kept secrets for most tuners.&nbsp You're not going to get very much info just by asking.

Running the split wider as load goes higher is counter to what Mazda does with their stock ignition maps programmed into the stock ECU.&nbsp I'll just leave it at that for now.



-Ted

fatboy7

holding back on us eh?

I've heard too much conflicting info on timing.... it scares me

pistonsuk

isnt more advance = power? i know there is more to it like keeping up the advance after the peak torque to lenghten power band but ist that the general rule?
what conflicts?
justin

RETed

There are SAE papers on the subject.&nbsp http://www.sae.org/ &nbsp I only know what Mazda R&D has concluded with their experiments.


-Ted

RETed

To a point...


You can advance to the point of detonation.

We were talking about trailing split.&nbsp Mazda runs split timing to "0" and load increases, which is opposite of what you're describing.


-Ted