Apexi Power Fc

[32godzilla]

Well I finally got my hands on a hand controller for my PFC. My car's always felt sluggish on light load / throttle, so as per Paul's PFC guide I upped the ignition timing by around 4 degrees up to about 8 x 8 on the map. The car definately feels more responsive and 'snappy' now but I'd like even more responsiveness but don't want to stuff around too much more with the map considering my inexperience and the possibility of damaging my engine. (I know I should get it properly tuned but a little low on $$$ at the moment!)

So if anyone is willing to post up their map I'd be extremely grateful. (Or comment on my maps below). My mods are only cat-back exhaust, pod filters and running 1 bar on RB26DETT. Car makes 232awkw.

Original map (not sure if it's default or not)

Modified map

Edited July 10, 2009 by 32godzilla

[paulr33]

please be careful when doing this, but if you practice and take it easy

and tune under 3000rpm you should be ok. FYI i added around +12 on my map under 3 grand and it loves it

sometimes peak ignition timing i see on my hand controller is 53-53deg. but i think my CAS is a bit backdialed, so just cos mine can take 53deg doesn't mean yours will. mine is 210k RB25 stock with stock everything

[32godzilla]

Thanks for the info Paul - exactly what I was looking for! Was just interested to see how much advanced timing other people had got out of their car - not that I'm about to just crank it up to +12!! I'm getting very little knock at +4 but will drive it for a couple of days before turning it up some more.

In regards to the maps, I notice mine jumps from 25 to 30 and 40 to 45 in several places - is it better to gradually jump up 5 degrees over a couple of cells or it doesn't make any difference?

Oh and btw, I know many people have said it - but your faq really does kick ass!! Helped me out so much - cheers.

[Fry_33]

I don't know a great deal about tuning etc but from what I've read up on etc the ECU will interpolate between cells, up and down, diagonal. So you want to smooth out the transition between cells as best you can. If the PFC uses a cell and it doesn't appear to use the one to the left of it that doesn't mean it's not affecting the timing etc. Say if the rpm falls between the two cells the one on the left is being used to help figure out the tranisiton value between them. Hope that makes sense?

You may want to check your base timing is set right before starting to muck around too much. If you want to set it at say 15deg BTDC then you need to set the cells in the PFC map idle area and surrounding ones to 15 so it doesn't fluctuate and then physically adjust the CAS.

If I'm way off with this then anyone please feel free to correct me!

[32godzilla]

Say if the rpm falls between the two cells the one on the left is being used to help figure out the tranisiton value between them.

Yeah that's exactly what I was thinking. The map normally moves diagonally down and right when you put your foot into so I would think that you wouldn't want huge jumps in ignition timing - the smoother the better. I'd really love to see a good map done by a reputable tuner (any sort of car) but from what I'm gathering people are a little cagey about their maps - and that's probably fair enough.

Edited July 11, 2009 by 32godzilla

[JonnoHR31]

afaik 26's are sposed to be 20 degrees at idle, not 15 like other rb's.

here are my fuel and timing maps, tis a rb25 with gt30. tuned by a reputable tuner in perth

[32godzilla]

Thanks Jonathon - just what I was after, and just confirms what I thought, a nice 'neat' map with no big jumps in timing anywhere.