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| | |-+ Speed density processor in a mass air car
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Author Topic: Speed density processor in a mass air car  (Read 9479 times)
David Claflin
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« Reply #15 on: March 17, 2017, 07:12:05 pm »

Just to throw some follow up on this, after a loooong time. Ive been fiddling with this off and on, mostly off trying to get it to run better using the speed density processor I have. It's a DB1, that "looks" good on the circuit boards, but theres obviously no way to test it.
I tried running a mass air BAP sensor and while it would run, it idled high, and had other issues. I swapped in a MAP sensor from a speed density car, and that let it idle at normal RPM, but still was not quite right.
I noticed that at idle, cruise and WOT the trace on the volumetric efficiency table stayed right at 100%, which means it thought it was at WOT all the time, so no matter what I did with the rest of the table it always stayed maxed out. Mind you this is on a mild 306, that idles at 15-16" of vacuum.  I don't know yet, if there's something I did wrong, or need to change in the tune, or if there's something up with the processor.
I bought a 4 hole throttle body and modified a vic jr to run edelbrock fuel rails, so may mess with it more if I stumble across a known good DA1 or DB1 processor. I've got a JV1 processor that is from a 1986 AOD car, but I don't want to take a chance burning anything up on it. I've also got a complete car and EFI harness from a 1986GT, and a buddy has a stripped 1985 coupe, so they might all get thrown together on it to run a complete factory speed density EFI system and a 4 hole throttle body sometime in the future. If all else fails the Mega-Squirt systems seem to be pretty decent, may try one of those.
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1990 Red LX, 306, 75MM, ported gt40's, Holley SMII, accufab longtubes, 3" exhaust, 4.10's, 318RWHP/316RWTQ
1985 LTD LX 302, ported TW's, XE-264 cam, ported Holley SMII, 75MM-R TB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
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« Reply #16 on: May 15, 2017, 10:53:57 pm »

Interesting thing here.  Were you using BE?  How was the data logging?  I was wanting to play around with a SD tune for once, (I have cal'ed many MAF cars) 
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« Reply #17 on: May 16, 2017, 08:56:05 am »

Is there a logable payload for MAP?  What does the trace do in the spark tables?
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85GT, Dart Windsor Jr, Crane 2030 equiv. Performer 5.0, 75mm TB, 88mm Slot, 34lbs injectors, 1 5/8" shorties, 5spd converted to 4R70W with Baumann controller, 3.25 9"
A9L running A9P bin via Quarterhorse with LC-1
David Claflin
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« Reply #18 on: May 17, 2017, 08:03:37 am »

Interesting thing here.  Were you using BE?  How was the data logging?  I was wanting to play around with a SD tune for once, (I have cal'ed many MAF cars)  
Yes, used Be with a CRY file from sailor bob. Data logging was OK, a few columns on there I had no idea what they were...LOL!

 
Is there a logable payload for MAP?  What does the trace do in the spark tables?
I don't remember looking at the spark trace, and MAP does have a column on the datalog
Here is a short datalog from the Bcam and Vic Jr., at WOT it's going to look really rich, but I was just trying to get the fuel injector duty cycle to align with that of the mass air set up. Don't have a wideband, so only way to compare.

* 90LX 302 Vic jr Bcam 2017_Apr_29_14-16-21.csv (145.93 KB - downloaded 15 times.)
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1990 Red LX, 306, 75MM, ported gt40's, Holley SMII, accufab longtubes, 3" exhaust, 4.10's, 318RWHP/316RWTQ
1985 LTD LX 302, ported TW's, XE-264 cam, ported Holley SMII, 75MM-R TB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
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« Reply #19 on: May 17, 2017, 11:30:50 am »

Thanks David. I have the file on Clint Garritys site. I see a .cry file but have not looked at it yet. In your file from Salir Bob, are there switches present to disable TAB and TAD? There are not in the file I have... that I can find.
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David Claflin
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Location: Redneck Riviera (Ft Walton Beach Florida)

« Reply #20 on: May 17, 2017, 12:27:36 pm »

There's the thermactor and egr present in the scalars, but nothing specifically identifying TAB and TAD.
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1990 Red LX, 306, 75MM, ported gt40's, Holley SMII, accufab longtubes, 3" exhaust, 4.10's, 318RWHP/316RWTQ
1985 LTD LX 302, ported TW's, XE-264 cam, ported Holley SMII, 75MM-R TB, MAC 1 3/4" longtubes, 4R70W, mach 1 brakes
1988 GT long term project
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