Daily WTF

[MotoFab]

(06:47:14) AbeFM: 800 injections. Run it five times
(06:47:46) AbeFM: 24 cc, 24.1 cc, 58cc, 23.9cc, 37 cc
(06:47:59) AbeFM: Damnit it ALMOST makes sense.
(06:48:23) Fred: LOL

That's for sure, something is out of whack.

- Jim

[jbelanger]

It's not really thread jacking, it's on topic with regards Abe's daily wtf entry If you want you could do an article on it if you think you could bulk it up a bit more.

I don't really have anything to bulk it up at this time but will do one when I have more.

It still doesn't explain his results if he wasn't just making up figures. I guess it could be his hardware, but my gut instinct in this case is to... well... just scratch my head really. It's hard to comprehend how it could be that wrong at something that simple to do...

Fred.

I missed your previous post. There is definitely something wrong. 3 out of 5 make sense but the other 2 can't be due to any reasonable measurement error so something is wrong: software or hardware. Has voltage or fuel pressure changed?

In the video, the second run seemed to last much longer so that would lead me to believe the software is not behaving correctly.

Jean

[AbeFM]

I'm with you on that, the software seems to be the issue, it just takes too long.

My only reasonable guess is that it's just "double clicking" the button like ordering two sets of plane tickets online by pressing "buy it now".

Unfortunately, I don't think I wrote down the values any of the times it happened, but I will check. I remember expecting a factor of two and not seeing it, but other things like fuel spillage, etc, could contribute?

Either way, I don't really care.

I set my injector opening time on the car in a similar manner, just using idle AFR's. Probably not 100% ideal, but it does work - and verified under other conditions later. You can only do 2 squirts or 4 that way, other things piss off MS, but certainly using test tubes is the solution for anyone who has drive electronics built, a breakout board, software for it, a mechanical mounting scheme and a flying pig.

[Fred]

http://i238.photobucket.com/albums/ff26 ... 093646.jpg

Words don't cover this one...

[AbeFM]

that.is.hot.

[thebigmacd]

http://i238.photobucket.com/albums/ff26 ... 093646.jpg

Words don't cover this one...

What the heck Fred? That's my friend Louis' car! They finished it last weekend in time to run in the London Auto Club track day event

[Fred]

Small world ey ;-) I know a guy who is mates with your mate, you may know him, his name is Brandon :





Always wind up your mates as much as possible ;-)

Fred.

[AbeFM]

This is completely irrelevant to anything in this thread, but hey what in this thread isn't? I thought i would take this opportunity to share my FAVORITE SRTforums thread ever....this kid lives in my city and this is probably one of his most well thought out mods ever.

http://www.srtforums.com/forums/f32/doe ... tf-444998/



Yes that is completely replacing his intercooler. and yes he does argue that his temps re actually lower than ambient, yes he is a complete idiot.

Think I should also add that he is on his 2nd motor, 3rd tranny, 3rd paint job, and 5th clutch in this car. He just turned 18... anymore questions feel free to ask I know the kids whole life story by now.

[AbeFM]

OMG! I remember, a long time ago, finding out the MS-II code for the miata didn't know which half of the engine cycle it was on. There was some code along the lines of:

If(odd cyl) then (first half)
else (first half)

Someone caught the mistake, and now it knows what to do, but I always wondered how it could run firing the wrong injector channels. Well, it turns out, they added something called 'semi-sequential', meaning it actually cares which half of the cycle it's on now, and fires the correct injectors at the correct time. All this time, people have been seeing rough idle ~half the time, the reason being it randomly continued on once the motor started, firing 'whatever injector was next' instead of basing it on the known engine state.

Which at least explains why it didn't care that it was wrong half the time with the code above. Wrong or right it ignored that information anyways.

And here I am thinking about writing VVT code for it, and wondering why I would bother.

[Fred]

Well, it turns out, they added something called 'semi-sequential', meaning it actually cares which half of the cycle it's on now

Good to see you pay as much attention over there as you do here ;-) I read that thread and laughed at you at the time :-)