Won't stay running

[WeezilUSA]

So I got my car back together, and MS back together... New fuel system and the trans not bogging up the motor, makes for, well much easier to turn over. So being that I have new bigger injectors, I adjusted my req fuel, and tried to crank her up. She starts first turn, but won't stay running... Although throttle input helps. Would somebody mind looking at my datalog to see if you have any ideas.

I didn't get a chance to try a different msq... and I had messed with the after start enrichment values etc when I was trying to get it running before. This might have something to do with it... Also the spark tables may be a little off, and I need to advance my cam timing as its straight up, but being that the head was shaved and the block decked, just to be back to normal it would need to be advanced. None of these things seem like fundamental reasons for it to not stay running though, I would expect it just not to run as well.

Also, I am not running any sort of IAC, I just have the bypass screw out about as far as it can go, which on my 740 seemed to work fine. This car, I'm not sure if that wouldn't be enough air for it to stay running, but I suspect something else is going on with my settings, and maybe a more advanced operator could see that in my datalog?

My setup is: Ms1 running MS extra V2.2, I don't specifically remember my firmware version, but its one of the most current ones.
Glen's garage daughter card, running 36-1 trigger wheel with ford sensor, wasted spark using GM LS1 truck coils. 96lbs/hr racetronix injectors, fed by all -6 line, Wallbro 255lph pump, fuel pressure holds steady at 45psi although I can adjust it if needed.

I forgot that it has been a while since I had donated, so I just donated again, will attach MSQ when that gets processed, otherwise I will email it to you if you wouldn't mind.

Thanks!

[740ATL]

Normally I'd say... assuming you have a ballpark VE table, if it'll start and run for a bit, then die, you would want to increase your afterstart enrichment around whatever temp you're starting at.

[WeezilUSA]

They are all set at 10 right now, no matter what temperature... I think I had upped that cause of a fuel pressure issue I was having before.

[740ATL]

They are all set at 10 right now, no matter what temperature... I think I had upped that cause of a fuel pressure issue I was having before.

they really do need to vary with temp. Try it next time... read the temp, if it doesn't stay running, up the reading around that point by 0.1 or 0.2ms.... still doesn't stay running, up it again.

[WeezilUSA]

Ok looking at my after start enrichments, I think I do need to bump them quite a bit. Compared to your MSQ 740atl... the values after start are like 30-40, where mine were all set at like 10... So I'll give that a try.

Thanks for the input!

[740ATL]

Ok looking at my after start enrichments, I think I do need to bump them quite a bit. Compared to your MSQ 740atl... the values after start are like 30-40, where mine were all set at like 10... So I'll give that a try.

Thanks for the input!

go slow. bump it a bit, start the car, if it dies, bump it some more. You will need to make adjustments over several attempts and temperatures.

[Poik]

:ninja:

[WeezilUSA]

Can we change the title of this thread to, will stay running? :nod:

[WeezilUSA]

Search is my friend, not just on this forum :)

[linuxman51]

what was it? afterstart?

[WeezilUSA]

Well, cranking pulsewidths were actually really wide, so especially with the new injectors (too big really, 96lbs/hr) they were just spraying way too much in there... Basically we copied Poik's cranking settings, and ve table, then had to scale required fuel down to around 2.0 *calculator though 3.6, but his, with 65lbs injectors is 3... Also we bumped the crank trigger settings up a little bit, as timing was pretty retarded once checked with timing light. So after doing that, at first I had to keep my foot on the gas a little, around 1500 rpm, then we changed a few things around, I could get it down to around 1000, leaned it out and advanced timing a little more, and now it will idle on its own around 800 rpm, although it does miss on occasion at idle.

I need to order some new toggle switches as the ones in the ebay switch panel are failing, just as things are starting to get good... Also from where my motor sits at TDC now, the VR sensor isn't sitting on a tooth, its sitting between teeth... So I think I'm just going to change the bracket instead of having to tune around that. I've probably got a solid day of tying up loose ends, and then hopefully she'll run well enough to drive it around for a bit, and then head over to the dyno.

[linuxman51]

ah. so it was just a tuning issue then ;) sounds good.

[WeezilUSA]

Yup, this round was just a tuning issue. I am super stoked, but won't be able to work on it till next week :(... Hopefully I'll be able to bring it home now that its running, The garage is ready!

Also, I wanna get some locking aero-catches for the front, I'm worried about too many shiney things under the hood and parking it anywhere that I can't keep a constant eye on it.

[Poik]

I don't think that the sensor isn't exactly on a tooth at TDC should matter, you should be able to compensate for that with the trim angle field, or whatever (the one under the Fixed Angle box). You may have to rotate the wheel anyways though, since there is something weird up with the timing. This may sound dumb, but are you sure you counted the teeth in the right direction of rotation?

[WeezilUSA]

Yeah I was actually thinking about it this morning... I think we were just thinking about it wrong when looking at it. The mark showing up further to the left with the timing light means it was advanced, not retarded... retarded would have been the mark being further to the right than center when flashing. I counted counter clockwise from the missing tooth (when facing the motor).

[Poik]

Holy bejesus you're right. I feel retarded. Regardless, I'll look around for one of the plastic timing covers that we can maybe cut up and throw on there to get it right.

[WeezilUSA]

I was thinking the other thing I could do is make a little metal plate to bolt there, using the trigger wheel would be an easy guide as the teeth are already at 10* increments