PowerFC: Some DIY tuning comments please

[paulr33]

it was borrowed but im thinking of buying one to loan out

[cameron]

Dont forget to turn off O/2 FeedBack when tuning the afr's.

Guys its good to see that use are all having a go with the FC and they are fairly user friendly but be careful when changing things that you don't know about.

Happy Tuning...

[The Mafia]

hey, we got datalogits, we are cool

[bmxwrx]

I bought the innovate lm-1 kit to tune the afr with the datalogit.

It interfaces easily to one of the 0-5v analogue inputs and allows you to plot average afr for each load cell. Very easy to tune with.

[Mik]

I bought the innovate lm-1 kit to tune the afr with the datalogit.

It interfaces easily to one of the 0-5v analogue inputs and allows you to plot average afr for each load cell. Very easy to tune with.

<{POST_SNAPBACK}>

I do the same with the tech edge...also too easy.

Hey BMX, hows the wrx catch can?

[paulr33]

After finishing the current tank of fuel I was on I managed to travel 402km's on a full tank. This is a significant increase in fuel economy. The wideband tuning was done when my fuel tank was just over 1/2 used and the ODO was on approx 220km's when we had finished wideband tuning. I usually get approx 330km's to a full tank.

I will see how it goes next week as I have just filled up today. I expect around 450km's to a full tank which is a massive improvement.

Thanks to all of those who have offered help and assistance.

The PowerFC guide will be updated in the next few days to include the wideband on road tuning and how to do it.

[paulr33]

have made 100k's of a 1/4 of a tank so far

will see how the rest of the tank pans out

[benl1981]

Paul I reckon your problem lies somewhere else. The stock ECU and Powerfc should give about the same fuel consumption if you dont hamer it much. You wil be in closed loop most of the time - relying on 02 sensor reading.

Are you getting around 14.7AFR at idle and whenever car is in closed loop?

I was getting about 400-450km to a tank (about 11-12L/100km) without the powerfc tune. When stuck on the dyno the AFR went into the 9s at full throttle.

Since the tune I got about 460km to the tank (10.6L/100km) but I reckon if I stayed off the gas then I don't think there would be any difference in consumption. The timing down low doesn't give you much benefit in fuel economy. I think a wheel alignment might give you more if you have too much toe.

You should check your injector duty cycles and air flow voltage at say 60km/h, 70, 80 and 90 in 4th gear (on the flat) and compare them with others on here.

Maybe you just sit in bad traffic or have a lead foot!! hehehe

[paulr33]

no i wasnt getting 14.7 under normal closed loop, the whole close loop imho is a bit of rip i think, it takes so long for the stocky 02 sensor to give anything useful to the ecu about the afr's almost not even worth having it on.

when ive done a full tank im gonna turn off 02 feedback.

with proplerly tuned afr's i dont think 02 feedback will do anything other than waste calculating power. ive never had good economy on the FC until now, when i tuned the INJ map with a wideband sensor. before then it was always average is 320/330/340. on a full tank of fwy i would get maybe 400 if i was lucky. never ever ever over.

stock ecu economy was ok ish, not super great. not over 400 thats for sure

i do mild spiritied driving some of the times but the majority is light load / cruise. my inj duties however around 1.8% 2.2% on light cruise

[benl1981]

On light cruise mine are mostly about 4%.

My o2 sensor was keeping idle and light load around 14.4AFR. It cycles at about 5 times per second at 2500rpm. That's not bad.

As 02sensors get old they get less sensitive and increase reaction time.

[Robo's]

I just came back from Bendigo taking it easy and i got 390ks before the light comes on. I generally can push this out to 450 before i fill up (love running it on empty) Last tank 434ks. I was quite dissapointed with the open road cruising as i took it easy and was only gettting 100ks every quarter of a tank. When we tuned it we concentrated alot on fulll throttle but didnt do much on light throttle since upping the fuel pressure so i guess its guzzling on light throttle. Im smoothing out the part throttles Inj cycle to try and bring a little more effeciency into it. Even with the bigger turbo i think i could still get 500ks on a trip but might need a dyno to see my AFR's at light throttle.

Im experimenting at leaning it out a little on light throttle but its all guess work until i get a monitor. Remember i could only be adjusting it 1% here and there so its really not going to make much. I hope i dont lean it out too far.

[paulr33]

210k's to half a tank

[The Mafia]

be thankful, I am doing 210kms to a FULL tank....

after being tuned!

[paulr33]

about to upload my current tune data and .dat files and also got the datalogit afr chart in excel so i can spit out my afr's apparently based on what the pfc inj map values you are (so it claims anyway)

[paulr33]

attached fuel inj compare against last tune and also fuel map and also datalogit tune .dat file. rename .txt to .dat and use it with datalogit if you wish

paulr33_193rwkw_widebandtuneup.txt

[Robo's]

Paul

Check you 3200rpm light throttle, looks wrong to me. Your dumping in more fuel there than anywhere else.

[paulr33]

thanks Robo for pointing that out, something i clearly missed.

I managed to get 504k's to a full tank of all hwy driving on the weekend,

This week is city testing, so far 100k's on just under a 1/4 of a tank.

Will update those 3200rpm cells, should be 1.00 instead of 1.070

[SAMFISHER]

I was getting about 400-450km to a tank (about 11-12L/100km) without the powerfc tune.  When stuck on the dyno the AFR went into the 9s at full throttle. 

Since the tune I got about 460km to the tank (10.6L/100km) 

<{POST_SNAPBACK}>

460km to the tank at 10.6L/100km would suggest that you have only a 48.76L fuel tank.

To properly work out fuel economy you need to start with a full tank, resest the trip meter drive how ever many Km's you want then refill tank to full and compare your actual Km's travelled to the amount of fuel you needed to fill it back up.

My around town fuel consumption for my PFC tuned 25t is 15L/100km which would be 433km's on a tank (65 litres) full to empty.

[Robo's]

My around town fuel consumption for my PFC tuned 25t is 15L/100km which would be 433km's on a tank (65 litres) full to empty.

<{POST_SNAPBACK}>

I doubt whether you will ever fill up with 65L

[benl1981]

I did the fill up reset the trip, then fill up again to get those readings. Thats the only accurate way you can do it. Not everyone is going to run it dry..I ran it till almost E and got 460km - no doubt plenty left - yes I put in close to 49L. You probably will never run it down to less than 5L unles you really push it.

15L/100km is horrid. To be honest though I havent really done much heavy traffic driving - I guess mine would probably go to 12-13L/100km then. They are only a 2.5L engine. If u use boost a lot then expect bad consumption.