hiccups on low rpm

[Chris181]

Hi,
after a short review, I changed the spark plugs, there were B6HS NGK (a bit "cold") and I put Bosch W8CC classics.
it is a little better, but I also changed the exhaust and I have to make new settings ...

Actually, injectors are pairing by 3+4 1+2 with 2 squirts by cicle, is it right ?

Thanks for help

[panel]

Actually, injectors are pairing by 3+4 1+2 with 2 squirts by cicle, is it right ?

Thanks for help

Chris here ya go------>http://www.shoptalkforums.com/viewtopic ... 6&t=138872

[Chris181]

Thanks Panel,I read it,
actually it runs not too bad.
maybe it runs better with 1/3 - 2/4

It SHOULD run better 1/3-2/4.
The timing variation of std batch and the peculiarities of manifold designs are the only reasons I can think of that 1/2-3/4 works for some.
Note that anyone running MS2-extra 3.xx can run semi-sequential so your injection events are evenly timed, and I strongly recommend doing so, with 1/3-2/4 pairs.
Timed MAP sampling is also an excellent feature, grab a fast sample at a specified crank angle/small # of degrees when things are quiet electrically.

I try this combination soon as I get some time.

[Vee Dub Nut]

IIRC... I'm still paired 1/3 and 2/4 now, and am using 4 squirt alternating. Judging by how much my VE table had to be scaled back to keep the same afr, I think it's the most efficient pairing (at least for my setup). When looking at all of the valve events, this pairing and staging should theoretically be even across all cylinders.

I believe my low speed issues were mostly a result of the wild cam I was running (none of the changes I tried impacted that). I'll confirm when my engines back together with the new smaller cam. I'll be retaining the 4 squirt alt w/ 1/3 and 2/4 paring when it goes back in.

[Piledriver]

2 squirts/semi sequential costs nothing to try, at worst you will get consistent injection timing...
(4 squirts timed is an option too, but I would worry about min injector PW/linearity at idle)

The MS3 style MAP oversampling/averaging in the latest code did wonders... Requires a full retune though.

These features are in the firmware essentially to address the specific issues you are^^^were having.
I strongly suggest turning them on, it's no harder to tune that way.(easier if anything)

[Chris181]

Actually it runs with 3.1.0 code.
I think the better way is to pairing injectors correctly in first time to see/feel changes,
and after change for new code 3.2.1, I'm right ?

a big thank you to gurus for their help

[Piledriver]

Actually it runs with 3.1.0 code.
I think the better way is to pairing injectors correctly in first time to see/feel changes,
and after change for new code 3.2.1, I'm right ?

a big thank you to gurus for their help

There were some near "Starship Troopers" sized bugs killed<3.21... it is the oldest code I'd try.
MS2-v3.2.1 is considered the "release" version now to be used by all new installs, and is the only version technically supported. (finding a bug in a beta etc will get action like yesterday, (I have personally seen bug report>fixed in 15 minutes) but you have to make sure it is NOT your setup with the base code, which is 3.21)

In fact, i'd probably consider the current beta, I'm not sure if EGO correction works on all channels on 3.21 or if that fixed it.
(IIRC was only actually controlling fuel on channel1, gslender spotted it on a stim with a scope connected)
The changelogs tell all.

the betas and gslenders variants have some interesting improvements that seem to work great, it will be interesting when they all converge. I'm running gslenders 2.46 at the moment. (since it came out) enhanced idle features work well, if a bit complex to take advantage of them all. (if you really NEED them all, you really need a MS3 just to have some free I/O)

Gslenders mods so far are mostly idle and filtering related, I'm still hoping he'll backport the per channel ignition timing offset tables.

[Chris181]

my memory playing tricks on me, I just check my injectors and are well connected 1/3 and 2/4 ...
I would have preferred to make a mistake
Friends tell me that the Thing turns pretty well and I have to look too perfect for a few sporadic jerks at low speeds.
I will enjoy this beautiful day for a walk and later I installed the 3.2.1 code ... I like to play with

[Chris181]

I just did it
after 4/5 try , with bugs , the MSII is now 3.2.1
just have to play with ...

[Chris181]

it won't start this morning , I think I'm return to 3.1.0

[Piledriver]

Are you using the new firmware loader?

[Chris181]

Hi Pile,
I'm using the downloader with the 3.2.1 file .
Thanks

[Chris181]

back to 3.1.0 and run

[Chris181]

I just found a rookie mistake.
the sheath accelerator was not in contact with the tube passing through the fan shroud
now I accelerate to max and the tps has a value more consistent.
After a few tries, it seemed to me better now,

the VE table was generated with this error (the value of 100% tps)

I wanted to use autotune, but I think it's too lean at low speeds now.

what's your "advanced settings" in autotune ?
what's the better AFR target for cruising with a daily 1600cc ?
thx