Good way dial in cranking pw?

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Good way dial in cranking pw?

Unread postby Pappacosworth » Wed May 09, 2018 1:39 pm

I tried to search for information. Injectors are Lucas D1720BA 30 Lbs, and I didn't find any parameters for those also. I used Pro M 30 inj. values, Maf is ProM for 30 lbs. Maf transfer is from EA, but I had to use 0.7 multiplier to get matching afr, and added low slope by 10%. Now I have afr rather near where it should be but cold starting is difficult, I must pump throttle to keep it running. Innovate is heating so long after start that I can't get any reading from it before it's too late. I tested base tunes valus, 94 Cobra values, Cobra R values, added 20%, 40% decrease 20% and no noticeable effect.
Car is 1994 Cobra, aluminium heads, Comp Cams stage 1, lth:s higher compression. Ecu is T4M0 but bin is originally made from J4J1 and some older base tune, that worked fine in 5.0 Cobra with Tbird 30lbs injectors.
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Re: Good way dial in cranking pw?

Unread postby decipha » Wed May 09, 2018 2:52 pm

instead of taking 30% out the maf go take 30% out from the high slope by raising it by 4.3 lbs/hr or so

why cant you turn the key on and let the wideband warm up first and begin reading before cranking?

it sounds like your cranking pw are fine, ford fuel control can be broken down in to 3 modes. 1st is cranking pw, thats the time you have to hold the key in the crank position before it fires off meaning >1000 rpm's. 2nd is base fuel i.e dialing in the injectors and maf which you haven't done correctly. 3rd and last is startup enrichment. If you dont have to hold the key in the crank position for long to start the engine then your cranking pw is fine. With such small injectors its got to be significantly off before having any issues. Since your base fuel is dialed in that only leaves startup air and startup enrichment. If you don't have the cams startup air dialed in and the heads startup enrichment dialed in from that last 30lb tune then that tune is completely irrelevant. Just cuz they both had 30s has just as much relevance as the vehicles color paint meaning absolutely none.

Ive done several tunes with the Lucas 42s but never their 30s so i don't have any data for them.

best bet would be to use the t4m2 as all of that is simplified already making dialed in the isc multiplier and startup enrichment simple
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Re: Good way dial in cranking pw?

Unread postby Pappacosworth » Thu May 10, 2018 10:07 pm

Wideband shuts of in cranking mode, and starts new heating period. MTX always heats same time. Maybe it's connected to wrong voltage supply, that shuts when started. I tried new base tune with same adjusted injector and maf settings, and it's much more off.
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Re: Good way dial in cranking pw?

Unread postby decipha » Fri May 11, 2018 6:36 am

cool just keep dialing it in
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Re: Good way dial in cranking pw?

Unread postby Pappacosworth » Sat May 12, 2018 1:53 am

My own version has only stalling in first minute after start, I can't get base tune to idle at all. I hate tuning idle, I have to use as much time to that as the rest of the tune.
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Re: Good way dial in cranking pw?

Unread postby decipha » Sat May 12, 2018 6:10 am

well yea startup air and enrichment is tedious

you can see in the log u no longer need enrichment 10 sec after start at 84 deg

looks like your manifold volume is too low

mafv err - cold though
2.00 0.98
1.75 1.05
1.50 1.02
1.25 1.06
1.15 1.02

its impossible to dial in idle air or enrichment when you hit the throttle cold, you have to let it warm up correcting to get it dialed in, she looks like she needs alot more air at 130 sec at around 90 deg go kick it up
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91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
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00 Explorer 5L - Bernyce

Re: Good way dial in cranking pw?

Unread postby Pappacosworth » Wed May 16, 2018 11:07 am

Is cranking too rich when I have to use full throttle to get it started. I used last night trying to get it idle with base tune, I can't. My own tune is based on some of your older base tune, and my ex cobra engine tune. I got data sheet from owner about ProM maf, and I used those values. I dialed injector values as close I could get those. Then I have made small corrections to maf curve, I think cold air kit, tb and other stuff will effect it too.
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Re: Good way dial in cranking pw?

Unread postby decipha » Wed May 16, 2018 4:20 pm

correct, you need to reduce the cranking pw

decipha@FuelWriteUp wrote:Cranking PW
Cranking PW is the actual pulsewidth in msec the injectors are fired for every pip signal. If you have difficulty starting and suspect the cranking PW are too high (i.e. too rich) hold the throttle to the floor during crank to shut off the injectors and verify. Cranking PW do not have to be perfect, typically +/- 25% of ideal will suffice with no ill effects. In summary, If you dont have to hold the key in the crank position with the starter engaged for long to get the engine to fire then your cranking pw is fine.
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decipha
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Posts: 15489
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce


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