Been running an Power FC for some time now - I've spent some time develping the map but have really only concentated on the full load rows (15 and 16 in my case) an dhave largely ignored the rest of the map.

Whilst the car runs very nicely outside of the full load area and easily as nicely as the stock ecu I just wondered if others who have perfomed mapping theirselves have bothered with non full load areas and if so what in particular were you trying ot acheive?

 

Bounce - comeon! I can't be the ONLY one to have mapped their own PFC!!

 

havent mapped the car, or have experience with the PFC, but I would assume there are 16 load sites? If so, I would probably work from 6-8 upwards, as full load is not the only point you may want improved perfromance? I know that since my TEK3 map, all areas of the drive have been improved (full and not full load). Just my 2p, I'm sure someone with some proper knowledge will answer you shortly!

 

to get the most you would want to tune to MBT in all areas, a simple way of doing this roughly is go map each cell making sure your happy with the afr then increasing timing until knock is detected. Lot more too it obviously but that should get you started.....take it you have a Wideband o2 etc?

 

Have you got FC Datalogit as making large scale changes especially to fuelling using the commander I found to be very frustrating.

I've fiddled with most areas of my PFC map. I think the best place to start is get your AFRs where you want them. I found that 13:1 just as you come onto boost richening to 12.5 then 12:1 through 5 and 10 psi with 11.6 as the midrange target from 14psi upwards richening to 11.2 at the topend feels the best, particularly in terms of low boost response as the turbo is spooling. I tried leaner during spool to increase egt but it didn't feel as crisp as with the richer AFRs.

For ignition timing I first started at the lowest boost possible with the AVCR off and then used the global igntion adjust in the commander to increase everywhere by 1 degree. Once satisfied I was knock free in various driving conditions I tweaked the boost up to setting A, repeated then to setting B and repeated. Make sure you use plenty of part throttle boost, and snap throttle openings at various starting rpm to ensure the transitions from low to high boost are also safe.

Once I was happy I would then adjust the 20x20 ignition map in the appropriate places. Drive like this for a period of time to ensure there's no suprises, then you can start over with another degree of advance on the commander ign/inj setting.

Getting the fuelling right took a fair bit of time using datalogit, especially adjusting the coarse airflow calibration (which is available in the commander) and fine tuning the MAFV/airflow curves (which are only in datalogit) to get the injector multipliers in the fuel map to correlate with the appropriate AFR.

Don't forget you can also tune your transient enrichment from within the commander too.

I'm happy to help anymore with specifics if I can

Simon

 

TonyFlow - PFC is 20*20 I only ever hit load site 16 max though.

CataIunya - I agree with this but the thing is to do this on road only and without a dyno is surely almost impossible - presumably with a road mapping session it's only possible to correctly map those areas that the engine actully uses? (ie what is hightlighted with a ghost trace).

Yeah have a LM-1 wideband and LMA-3 aux box and a knock sensor - no det-cans though so have to be a bit on the cautious side - havn;t taken exhaust gas temps yet either but I think I probably have a way to go before I need worry.

Simon - Thanks that's very helpful - I may well need a little further help - really need to have another weekend getting stuck into the mapping project - time's been a little tight recently..

From what you are saying I'm running well on the rich side of optimum:

http://www.ejones.dsl.pipex.com/imag.../logs/AFR1.jpg

 

I can't imagine that going below 11:1 is going to add that much safety, but will certainly impact on power/torque. It depends partly how much advance you're running with that also.

When AndyF mapped my car his targets were 11.6 midrange richening to 11.2 at the top so I've tended to stick with that. This was for 1.5bar peak boost midrange. dropping to 1.3 at 6000rpm.

Simon

 

Your'e probably correct on that I' sure I can go quite a bit leaner.

Your figures sound like safe enough figures from what I read elsewhere too - IIRC 11.5:1 is a figure commonly banded about for safety.

http://www.ejones.dsl.pipex.com/imag.../map/ign_1.jpg
http://www.ejones.dsl.pipex.com/imag.../map/inj_1.jpg

are my current maps for ignition and injection respectively.

As you can see I have really not as yet deviated much from the default settings...

 

What setup/mods does your car have?

The ignition map looks pretty well advanced to me as it stands. If you plan to lean the mixture off it would be advisable to take some advance out first as it may det with the current advance on leaner AFRs.

Your airflow calibration looks a way out too. 1.32 in the inj map should give 11.1:1 AFRs rather than 10:1. Try setting all of rows 15/16 to 1.32 then monitor what sort of MAF voltages you see through those zones and adjust the 8 point airflow calibration at the appropriate points (in settings/airflow/... in the commander IIRC) to try and bring your observed AFR to 11:1. It'll then make it much easier to make further adjustments to fuelling if the airflow calibration is roughly similar to reality.

I would invest in FC datalogit if you're serious about mapping the car yourself, because it has excellent logging functions that make mapping so much easier.

Cheers

Simon

 

Cheers Simon,

The setup is as follows

Parallel Feed fuel rails
Full decat
VF23
Apexi Power Intake
Water Injection (.4 mm nozzle) trigger point as .8 bar
PFR7B plugs
And of course the PFC itself.

So not hugely modified.

I think the reason tha AFR calibs are so far out is due to the fact I'm running the injectors at 100% size adjustment - should really be 86% I beleive - the thing is I found this made the map too lean off boost and pick up was appaling.

So instead I set it to 100% and then just leaned the AFRs on rows 15 and 16 (though clearly not enough as yet!)

I see what you mean about getting the Target AFRs and observed to match making life easier - TBH I hadn't considered this!

Am considering the datalogit it looks like a very useful bit of kit - as usual though its the cost that's put me of as yet.

 

The Apexi power intake probably offsets the MAF so when you use the appropriate injector size it runs lean. There are five different intake settings to choose from in the PFC. If you are using the standard setting then this may explain this. The appropriate intake setting for a cone induction kit is the 2nd option down, but not sure if that'll be the same for your version.

As you have water injection, you will be able to safely run leaner and more advanced than otherwise. You really need to specifically map for water injection otherwise it will just lose you power by diluting your charge (so to speak).

Are you running open loop fuelling all the time then?

 

Yeah see waht you mean - I've got my MAF calibration set for the Power Intake - can;t recall offhand what number it is - this did richen things up slightly (full load appearing on row 16 rather than 15)

No running closed standard closed loop setup at low load - I think the problem was occuring at the transition point between closed and open - at leas thats what it felt like - so would run fine then as you put your foot down would hesitate before taking up.

Alos found that the same occurred between gearchanges (much like with a VTA BOV on a OEM ECU) so really nast and jerky - richening the map overall by injector callibration immediately cleared up the problem - but then left the map way to rich on WOT - hence me leaning it out - though it seem sI'd have a way to go.

I think I'm going to completely revisit the whole lot though - and revert to 86% inj callibration and see if I can't richen up the low load sites to compensate - I guess the transient enrichment adjustments coul dalso help in this area - did you need to deviate far from the std settings here with yours?

 

very interesting topic.i am currently maping my PFC with fc commander (what a pain)
car is wrx my 99 with td05 16g ,apexi power intake,full decat 3" HS exhaust parallel fuel rails and sti 5 fuel pump,removed today for a walbro 255 l/h and 440cc injectors.
i have no knock with standard pfc mapping,but i must add a lot of fuel(with sti pump) in the P12/2800rpm to P17/7200rpm.injectors are rated at 103% and injection duty alarm is flashing at 6500rpm.
i have not calibrated the maf curve,just choosen induction kit in the fc setting.
can you give examples of maf calibration for apexi power intake.

Charly

 

Yeah not suprised you have the injection duty alarm going off at 6500 set at 103% - From what I'm discovering the Apexi map ign is quite advanced for 98 RON so unless you pulled the ign back alot of fuel would need to be added - would have thought you are running v-rich tho' like me - have you had a wideband on it to see your AFRs? presumably you had 380cc s or there abouts with this setup?

I'm just using the stock settings for the Power Intake- so each voltage increment is still at 100% - but this is pre calibrated in some way or so I beleive to be different from the OEM airbox setting - would have though it's the same as the induction kit selection in your PFC or at least very similar?

 

i have a lambdaboy with NTK L1H1 probe.injectors are standart 440cc.
no knock with apexi isn map,but very big difference beetwen theoric AFR and wideband display.

example : 1.32 inj map means AFR is 14.7/1.32 = 11.136
if the wideband displays 11.8 instead 11.13, maf corection must be
100% x 11.8/11.136 = 105 % for the voltage i read in this row?
is it right?

Charly

 

That would certainly seem to make sense but I've not tried it myself as yet - I was gonna start over and approach it first by a correction on the injector size itself - as I'm way over rich at 100% I think I'll knock back the injector size correction to 86% (100/440*380) - as I believe the the PFC is actually set for 380s out of the box - and then adjust MAF values to trim it - if you see what I mean...

 

i have the japaneese PFC's manual for MY99 and 00 STI models,and it indicates 505cc injectors at 3bars and 14.4volts for the starting map