Author Topic: M42 Engine management maps and info (Read 27356 times)

fabe · « **Reply #15 on:** February 08, 2007, 09:09:29 AM »

XMS3? which standalone system is it???

IIRC, the MOTec and Haltech interface are much more comprehensive (READ: Not exactly user friendly)

Gunni · « **Reply #16 on:** February 08, 2007, 09:48:00 AM »

It�s from Perfect Power in South Africa,
It�s quite capable aside from intake air temps input is not used for fuel calculations only ignition.

fabe · « **Reply #17 on:** February 08, 2007, 10:28:17 AM »

the same company making the SMT6 which I'm using... but I think there's too few map points (8x16) to fully optimise the engine performance.. basically it has the same number of map points as the SMT's

Gunni · « **Reply #18 on:** February 08, 2007, 12:20:47 PM »

It�s fine, when they intergrate interpolation in between the cells it will be fine,
a 8x16 map will actually become 64x128 in total assuming 8 points between cells,
also they have a MAP compensation that helps as well

bar73k · « **Reply #19 on:** February 08, 2007, 05:16:59 PM »

Quote from: Gunni;19074

there must be a another map that has something to do with manifold pressure?
as you can have 0-20psi at WOT

yeh im still trying to find that,
i have found something but cannot make sense of it...

asubimmer · « **Reply #20 on:** February 13, 2007, 03:20:08 PM »

does anyone have maps for MS1 v3.0?

tia

asubimmer · « **Reply #21 on:** February 22, 2007, 09:27:08 AM »

Quote from: asubimmer;19456

does anyone have maps for MS1 v3.0?

tia

ttt MS is on the way to my house :cool:

steve321 · « **Reply #22 on:** March 04, 2007, 05:02:53 AM »

do you have the fuel maps too, i am currently trying to run mine with mega squirt V3, and having a nightmare doing so, so i think a fuel map would help me out.

cheers, steve
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Gunni · « **Reply #23 on:** March 05, 2007, 04:29:10 AM »

That is going to be diffrent, you should use something close to that top map for ignition, remember to account for the pressure changes in that map against what your setup is (MAP vs. RPM for instance)
If the ignition is good enough then fuelling is easy.
don�t you have wideband?

steve321 · « **Reply #24 on:** March 05, 2007, 04:49:34 AM »

no dont have a wind band just yet, and i have the motronic doing the ignition, i am just trying to do the fueling first, cos i thought i can do less damage with fueling if i get things wrong.

steve
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Gunni · « **Reply #25 on:** March 05, 2007, 05:52:58 AM »

You�ll never get anything done with a narrow band only.
Spring for a wideband controller right away

steve321 · « **Reply #26 on:** March 05, 2007, 05:54:31 AM »

i'm having trouble just getting it to start tho, i had it going at one point when i adjusted the warmup enrichment, but then it just dies again.

steve
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Gunni · « **Reply #27 on:** March 05, 2007, 08:29:10 AM »

Get a wideband. you should not mess with the warmup enrichement until you have gotten the car to start.
just keep adding fuel slowly until you hear the car start to catch,
but first of all get a wideband.
without one it�s almost as driving with your eyes closed

Gunni · « **Reply #28 on:** March 21, 2007, 12:41:35 PM »

Little update.

I�ve been having stumpling issues from day one,
plenty timing advance has always fixed that. but It�s been ridicoulus.
I was at 40degree at WOT , at any less advance the car would stumple.
now that is just silly.

So I uploaded the latest map and changed the ignition refrence.
I put it at 90 degrees before tdc and WOW....

Before
hard to have free revs unless timing was really advanced,
It only wanted to rev under load.
idle was iffy and took long to stabilise.

Now :
All is good apart from the idle wich I need to re configure again,
the fuelling has to be raised now as it was idling at 18afr�s just now.

It also pulls VERY well now, and I�d never imagine a M42 working like this.
I�ll do some gtech runs very soon to check for any diffrences

As I was driving around and trying to loosen the back end, I came quite hard up to a wide well open turn and it went sideways like never before,
I wasn�t able to catch it fast enough, it spun a 360� and I tried to cath it on the rebound but that also failed as I was on the throttle spinning the tires the whole time. And then it stalled, I was quite happy to be honest
with it�s capability to spin the tires.

an318is · « **Reply #29 on:** March 28, 2007, 01:49:41 AM »

Im not sure this has occured to anyone, but when tunning an Engine management system you dont just tune the map, there are also offset table for temperature compensation and the main trigger offset(Im not sure what it is for an M42). This trigger offset is the degrees differece from when the ECU gets pulsed to when TDC actually is, this is for the sync sensor. Now all the values in the table get added or subtracted to that base offset and temperature compensation applies to that. From my knowledge this is how the majority of engine management systems work, Autronic, Motec, EMS etc.. So purly showing your ign map really doesnt mean anything without information of at least you offset setting. I may be wrong when it applies to some brands of ECUs but it is usually a relative value not an exact value.

Any thoughts or opinions