89 Mustang MS3 gold box tuner studio idle control and injector dead time

91mustanglxcoupe

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Sep 30, 2019

#1

• Sep 30, 2019

• #1

I have a 89 mustang with SBF 302 with GT40P heads and Vortech V1 blower at 10psi and running the ms3 gold box with tuner studio. In the idle control section I'm trying to find out what the valve mode is supposed to be set at inverted or normal for a stock IAC valve. Idle valve type is set at PWM valve 2/3 wire setup and algorithm set to open loop. Trying to get the cold and hot cranking tuned. I'm running Siemens Deka 60's and letting VE table dial itself in with auto tune. I'm also trying to find correct deadtime for injectors which is currently set to 1.00ms. Can anyone help me out thanks.

 

a91what

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#2

• Sep 30, 2019

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Hmm this should be in the digital tuning forum. I am going to move it for you.

I have all the needed information for the DEKA 60 injectors including the small pulsewidth settings.

Megasquirt Deadtime Calculator Siemens Deka 60lb.xlsx

 

90sickfox

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#3

• Oct 1, 2019

• #3

My 89 had to be set to inverted.

 

a91what

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simple way to check for idle valve polarity is to change the valve setting in warmup mode from 30% to 100% and see if the idle speed increases if it does not invert the polarity and try again.

 

91mustanglxcoupe

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Oct 1, 2019

#5

• Oct 1, 2019

• #5

Thanks guys I was changing idle duty at warm up and wasnt doing anything with valve mode at normal setting . I thought I had posted this to the digital tuning forum thanks.

 

91mustanglxcoupe

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Oct 1, 2019

#6

• Oct 1, 2019

• #6

Not really sure I'm reading this spreadsheet right on my phone deadtime I can see is 0.41 on the spread sheet do i meed to modified numbers in the spreadsheet I'm running 42psi fuel pressure. Not sure what I'm susposed to change if anything

 

a91what

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change nothing. You want to enter the deadtime and voltage offset values for the MS3

 

91mustanglxcoupe

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I see ms3 output and the beta small pulse width curve which says is total garbage and below that I see the deadtime of 0.41 should I use that as my deadtime then i'm confused about this

 

a91what

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Yes use the deadtime and offset value for the injector for MS3

 

a91what

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	Dead Time	0.420280319​
	Dead Time Voltage Curve
	8	352.32%
	11	185.33%
	12	155.50%
	13	126.65%
	14	100.00%
	15	76.28%

 

91mustanglxcoupe

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#11

• Oct 1, 2019

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Thanks again much appreciated I'm going to try these settings and adjust ve table and go from there

 

a91what

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#12

• Oct 16, 2019

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So having any luck?

 

91mustanglxcoupe

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Oct 18, 2019

#13

• Oct 18, 2019

• #13

I tried that dead time and the fueling is way off so I been trying to dial in back in using autotuned and driving around seems to be running ok now but cold starts are still not good trying to dial in WUE and need to figure out the cranking pulse and priming pulse settings for colder startup temps

 

91mustanglxcoupe

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Oct 18, 2019

#14

• Oct 18, 2019

• #14

I can adjust the idle duty and warm duty settings and the stepper motor counts go up but doesn't seem to do much for raising idle or making it run better during start up

 

a91what

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• Oct 18, 2019

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The dead time values are what they are if your fueling is off then you have to tune the VE table.

Step1: Get the correct settings into the ECU
2: Tune the Ve table best you can with the engine fully warmed up
3: work on the idle settings to get the car to idle at the speed you want.
4: repeat the above steps but work on the warmup and cranking ASE settings with each cold start.

I think you have some of your settings incorrect for the idle, The Ford idle valve is a 2 wire PWM type... not a stepper so you will have a PWM% output to the valve.

I also offer classes and tuning services if you need help tailored to you, I do this all the time and have a great rep.

 

a91what

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#16

• Oct 18, 2019

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If you are interested.

Service Provided - Megasquirt ECU support and Tuning

I can help with aftermarket standalone ECU installations troubleshooting and tuning. I am in the Tampa FL area, but I can provide support anywhere in the world remotely I have helped guys as far away as Hawaii. I offer tuning classes and can do full tunes as well. -Classes are one on one to...

www.stangnet.com