Jim Galbally

mine DOES have an active ISCV i just dont know what to set it to

i have 2 settings, % enrichment for 25%,50%,75%,100% open

and at 10degree coolant increments open ISCV by XX%

i THINK i need to get the car warm, openm the ISCV by 25% then add enough fuel to keep the same AFR, then work out how much % that is, then inputb that into table 1 (then repeat for 50% 75% etc.)
that sound right?

then i just gotta work out how mch % i need the ISCV open for the required idle speed when cold

i dont think i'm too far out at the moment, as once it actually starts and settles down it does idle ok

Jim Galbally

ok i just did what i described above, and so now my AFR stays normal when the ISCV is open (when warm tho, not tried it cold yet)

also messed about a tiny bit with the cold enrichment so its now fine at 40degrees, 50degrees and 60degrees

then played with some full throttle stuff

now the length of road i wa using is residential, so it was hardly a flat out in 5th down the motorway type runs, but its better than nothing.

after about 4 runs of tweaking then datalogging, then tweaking etc. ive got it holding 13:1 AFR between 1500rpm and 4000rpm (i couldnt go any faster orid have crashed ) i was taking out about 10% fuel all the way thru!

it now spins up quite happily in 2nd as it hits the powerband

i REALLY need a driver whilst i sit in the passengerseat (or better still, a MAPPER in the passenger seat ) but i'm getting there

Stu @ M Developments

iTrader: (12)

Jim Galbally

by thw way stu, does it make MUCH difference flat out in 3rd to flat out in 5th?

could i be dangerously leaning off my map if i bring it to 13:1 in 3rd?

(remembering that ive got a slow car so its under quite a bit of load in 3rd )

Stu @ M Developments

iTrader: (12)

No, its not as fatal with Nasp, but i would drop to teh other side of peak power if i were you and send her to 12.5 until you can get her det checked professionally.

Turbo cars afr's differ with higher loads as you load the turbine up with a higher gas temperature and volume thus potentially running more boost.

Jim Galbally

oooh, i never saw that post, thanks for the info

anyway, i'm BAAAACK!

nice easy one this time... stalling...

the car doesnt seem to like dropping down near 500rpm. presumably because the mapping at this point isnt perfect.

it sits at about 12.5-13.5 at idle @ 800rpm ish, but the closer it gets to 500, the leaner it gets, down to about 18.

so, should i just richen up the 500rpm site a bit more? also what about ignition advance, im pretty sure its got a 0degrees in for down there (the only thing letting the car idle is the "idle stabilisation" part of the map, which advances the ignition (upto a max of 25degrees) at idle to reach the desired RPM (which is 850) if the idle stabilisation gets the disabled, the car wont idle full stop... lol


so, to recap, more fuel and ignition needed at 500rpm on loadsite 0?

Stu @ M Developments

iTrader: (12)

Shove 12 degrees in the map all around the idle point. That will fix it.

Also, aim for around 14:1 if teh engine will stay smooth with it. This may necessitate a change in base idle speed setting but will save lots of fuel and stop you being raped in a roadside test. Can it do closed loop ok?

Jim Galbally

whoops, just looked in the map and it does have ignition figures in there. (is 20 too advanced tho?)




i assume that i should bump up that 29 in 0/500 up to about 35ish?

stu as for the idle at 14:1, it runs MINT on warmup as it is (after you fiddled) and im worried if i lean it out itll run shit when cold again... lol

Jim Galbally

ps no it cant do closed loop, as my LC-1 has packed up the gauge works, the analog outs for the ECU dont.

but ive got a new one waiting to be fitted on saturday so THEn i can turn closed loop on.

BUT my main map is still quite a long way out, so closed loop would have to be correcting AFRs in the 11s/12s on cruise/overrun

Stu @ M Developments

iTrader: (12)

My Final Advice:
Let Mr Walker finish it on Monday mate. But spend your weekend getting her mechanically perfect for him to do his magic.

Jim Galbally

awww, thats no fun

cossie4i+

iTrader: (15)

He will most probable change every thing you have done anyway Jim

Good luck on Monday

Steve.

Garage19

Jim,

I would say your advance figure on idle seems a bit high. Try knocking it down to 15 degrees.

The 29 in you injection map near idle may be where you have actually mapped that point to run well / correct AFR and the surrounding points might be the ones that need adjusting?

Always hard to read maps from Emerald / DTA with out the associated chart that tells you how the load sites are setup. 1-16 means nothing on its own.

Really interested to see what Dave comes up with. Will you have your cams in by Monday?

Are you gonna post these ign / fuel tables agin after Dave has mapped them so that we can see the difference?

Once i had a map in the bag from Dave i would be tempted to switch back to this old map and carry on trying to tune it as a learning excercise. You can then compare it with Daves map to see where you went wrong.

Jim Galbally

garage, the cams WONT be in for monday

i will only post the figures from dave's map with his permissions, intelectual property n all that...

JjCoDeX75

Best of luck Jim

I have found this thread very interesting. I have recently bought a SECS ECu for me cossie, and am learning much like you!!

Hope all goes well!

Cheers

JJ

Jim Galbally

ok, started all over again now i've got another engine this one runs mucb sweeter, but doesnt likethe map from the old one very much, so basemap loaded and away i've gone

just did a bit of work on the idle a minute ago, it now runs about 14:1 at idle and the ignition is set to about 13 degrees. im not sure if i should be putting more ignition on the 500rpm site or less? so i did what you guys said and used 12-15 in all the bits around idle (ie loadsite 0+1 and speedsite 0-1000)

the closed loop's working, but its not able to do enough correction on most of the map sites (i noticed on the way home lastnight that at 50% thottle it was bang on stoich but less than that and i was in the 12s ) im sure thisll be much better once i get some of the cruise sites done


also back the the iscv... now ive set up the map for this based on how much extra fuel is needed when the engine is hot (ie then 50% open its getting 40% more fuel). but ofcourse the iscv is only used when the engine's cold... so should i need to change the iscv values? or does the cold start enrichment take care if this itself?

foreigneRS

are you sure? how about when warm and rad fans, heated screens, headlights etc are switched on?

Jim Galbally

yes im sure, it does NOT activate the ISCV for anything other than coolant temp.

it compensates for voltage changes by adding/subtracting fuel from the main map

foreigneRS

and opening the iscv normally - unless it's a shit EMS

the original

went to a rolling road day @ emerald yesterday, he was commenting how good the cossie turbo engines were for the age of the design

Jim Galbally

foreign, nope.

its a CHEAP ecu, but its hardly megasquirt

_DAN_

Really interesting stuff

foreigneRS

i was thinking about this last night jim and realised that i could've written more.

your ecu should be using the iscv at other times apart from warm up, like those cases where electrical load slows down the idle. the iscv should be used to maintain an idle speed.

my management does this, and also has compensation for voltage as yours does, but the voltage compensation is not there to maintain the idle speed under electrical load.

the voltage compensation affects the whole fuel map, as the injectors rely on a certain current opening them for a certain time to flow a certain amount of fuel. if the voltage is reduced, the current is reduced and the if the injectors are opened for the same time, they will flow a little less. so when the voltage decreases, you need to open the injectors slightly longer to get the same flow rate, and that is what the voltage compensation is for.

if you're mapped to a certain AFR at idle, that gives you a certain idle speed, and the electrical load on the engine is increased the speed will want to drop. how do you want to bring that back up using a fuel multiplier?

Jim Galbally

nick, i know where youre coming from, but my ECU does not support this. the ONLY thing i can do with the ISCV is fix it manually open in a set position, or set it to run off a colant temp based map. The way it bumps the idle speed up is by correcting the ignition advance. it advances the ignition in order to raise the RPM.

foreigneRS

doesn't sound very good to me. there seems to be no point in having an iscv like that, as you can set the bypass with the throttle plate

Jim Galbally

its useful for cold starts, without it the engine wont hold an idle

Jim Galbally

here's an odd one, it keeps fookin changing

drive from nurburgring to france, set up and running a perfect 14.6-15.0 on almost every loadsite

drive off ferry, running 13.3-13.6

stop at services, fill up, drive off, back to a perfect 14.6-15.0 again!

what the fuck?

also it seems to go a bit leaner when she's been sat, could this be due to the ACT getting hot? (the plenum gets a LOT of heatsoak) do i need to add morefuel for hot ACTs?

Jim Galbally

just for anyone interested, just a little update for how we're getting on...

chip tried to have a go the other day, but my shonky laptop sent duf data to the ECU and wiped the map, unfortunately i hadnt saved a backup for a while so ive lost about 2 weeks worth of mapping

nevermind,

went out with lennei for a few hours tonight, now we've got the cruise pretty much back to whatb it was before, ive trimmed a bit of the full thottle stuf so it sits more like 12 (before it was flicking between 11 and 13) but we forgot to do the low TPS stuff, so the car's SHIT up until about 5% throttle (unfortunately with the v6 you tend to sit on tiny throttle openeings quite a lot, so i need to tweak em a bit get em off of 11.5:1!)

also we found out what the hard cut revlimiter is like, it sounds THE BOLLOCKS, i really wanna turn off the softcut one and just to hear the backfires when the hardcut comes in

anyway, i also noticed i had the idle compensation set wrong, i had it trying to acheive 1000 rpm with a 890 base idle, so it was whacking the timing at idle up to 20 degrees! i set it to what it should be and now its a more comft 16ish, but i'd like it to be a bit lower (it does seem to like a lot of timing at idle tho)

i cant get the wideband input working properly either, it seems to display the WRONG values even tho the input voltage is perfect! might be a bug in the laptop software, as i'm confident ive got the right values in the lookup table

also closed loop still doesnt seem to work, if you turn it on it just throws everything mega-rich maybe its a bug with the ECU? i'll email emerald about it when i remember

cossie4i+

iTrader: (15)

When are you going to take it to Emeralds to be set up correctly ?

Might be cheaper and a lot faster in the long run Jim

Steve.

Jay,

iTrader: (4)

but fuck me that aint fun i have my misses out with me lol its a family event

ok if if your no nonesense then tuner all the way but theres nowt like doin it yaself chap

cossie4i+

iTrader: (15)

I only want him to have it set up properly then i can buy it off him when he goes back to a 12v twin turbo

Steve.

Jim Galbally

i dont like doing it myself, but i missed my appointment with dave walker

gonna get it booked in on tuesday, but ill have about a 6 week wait as he's a busy man

also got a list of problems to fix beore it goes on:

1) Snapped manifold Stud/Exhaust Blow
2) Replace Inlet Manifold Gasket
3) Replace the 932489384 leaking oily gaskets
4) Replace Radiator and confirm no coolant leaks

all piss easy execpt for the exhaust stud, but i know a man who can

Jim Galbally

oh, does anyone fancy taking a quick look at my map and spotting any obvious "holes" in it, as i was doing 1 site at a time, and looking at the overall picture means nothing to me, so hopefully someone with more experience can spot the obvious bits that are a bit out.

catch me on MSN and ill pop across the map file (its readable in txt format, but the emerald software is free if youd rather use that)