hmhaga

The Power FC was mapped during the summer last year, with outside air temperature at +20degc. Now winter and temperature has dropped to -20 degc.

Should the PFC handle this? I have the Datalogit interface, but haven't been bothered to connect and run a map trace/log - perhaps I should? What I'm worried of is that the ECU will now access cells in the map which is not "properly tuned" - as they were never accessed in +20degc conditions.

Engine seems to run fine. Had to change the boost duty cycle on the PFC, as it would overboost.

Any opinions?

FB Tuning

iTrader: (30)

If it's been properly mapped, then it should be fine.

If you've already trimmed the Boost Solenoid Duty in order to prevent overboost, then you shouldn't be seeing the load axis values much higher than in warmer weather - Therefore you won't be hitting anymore fuel/ignition map sites than you do at other times of the year.

The cold temperatures will give you the opportunity to check the AFR's during warmup (Water Temp Correction Table) with a wideband

If it has any issues trying to initially fire up, then make adjustments to the Cranking Enrichment settings.

I'd make a couple of logs to compare against summertime use anyway

SunnySideUp

My Standard Subaru Map has no trouble, whatever the Temperature, no need to adjust anything either - I would highly recommend having it done.

FB Tuning

iTrader: (30)

That's a really constructive comment.....

I doubt your standard ecu would run too well with different injectors/MAF/IK/Engine Capacity/Intercooler etc.

joz8968

iTrader: (13)

But it's more critical on the PFC, as it has no timing adv./ret. feature. I understand the OP's 'anxiety' and why he asked the question (speaking as a fellow PFC user lol)

SunnySideUp

My comment was tongue-in-cheek ...... but, it is important to note that a decent map will cope with the temperature ranges the engine will see ...... if it doesn't than I would respectfully demand your quite substantial money back!

But, I'm sure it will cope ..... this is why re-maps should be made to offer warranties.

FB Tuning

iTrader: (30)

I realise it was toungue in cheek - so was my reply -

There's no way any kind of remap could ever be supplied with a comprehensive warranty ( to cover failiures ) when you are extracting more power from a motor - My own car is running approx 2.5 times it's stock power output - But if it ever went wrong, i could only blame myself

If the ecu map just needs tweaking for an ambient condition, that wasn't able to be done at the time of mapping (just like the OP is asking about) then that's a different story, and i'm sure whoever mapped it in the first place would be more than happy to oblige FOC - Although i suspect in this case it may have been self-mapped, hence the original question

Anyway - back on topic....

seddomyster

iTrader: (9)

sorry to jump thread but ive read up that fiestaboy knows his stuff and was wondering if u can help me. had a remap with a vta dv an with a few other mods an runs fine. i want to replace this an go back to my standard recirc dv. would i need a map tweak. not changed yet as waiting for item but if it runs differently then that will be my answer im guessing.

Stealth

iTrader: (4)

You don't need a remap when changing DV's no

seddomyster

iTrader: (9)

ok thanks mate i just thought from goin from vta to re circ. cheers mate

dynamix

iTrader: (3)

That way round you will be fine - it will run much better.

Going from re-circ to VTA though you can iron out some of the poor running issues that can create in a re-map.

Re-circ is best.

Andy.F

Not for every application, on a large FMIC set up where do you recirc all that compressed air to to on lift off ? Back out the maf is where it goes and that can cause massive 'jolts' in power transmission as it overfuels.
A correctly set up VTA or dual vent works better in fmic applications.

seddomyster

iTrader: (9)

thanks andy im tmic at the mo an have planned running fmic in future but i just want to get rid of the baileys dv as dont like it an want to try recirc. but will take your knowlegde in on which dv type for fmic. thanks for the info guys. now back to the main question for the brainy guys

98myturbo

Sorry to bring this up again (and hijack? this) but is this an issue with a mafless setup? would a vta be better for a mafless engine running a fmic?

Thanks

Andy.F

Wouldn't really matter for mafless, one is quiet, the other is loud !

98myturbo

Ok, thanks. I know it seemed like a daft question but just wondered about the jolt in power but I supose the maf would measure air going either way through it hence momenterily running rich hence the jolt?

Cheers

Andy.F

Yes thats correct, the maf doesn't recognise airflow direction hence the jolt. You will not have that issue though

98myturbo

Cheers Andy.