Steve's Megasquirt/tunerstudio Help Thread

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Aug 24, 2003
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East TN
I've had my mspnp for a couple of months now on my '94 Gt and learned a lot reading this forum, also a big shout out to a91what for help with my tune. What setting do i need to adjust to keep the idle from dropping when coming to a stop? The car doesnt die but comes close to it.
 

a91what

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Mod Dude
Apr 6, 2011
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If you have Idle initail values table enabled, you will increase the values in this table to tell the valve to open farther when first entering CL idle.

beyond this simple adjustment there are a host of other parameters that could need some slight tweaking. try this first then report back
 
Aug 24, 2003
231
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17
44
East TN
Added 5 to Initial Idle Values and it seem to help some.....I think surging is still my biggest nemesis, if i tap the throttle it clears up for a few min.
 

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Aug 24, 2003
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also added some more timing to the whole table. Didn't help my surging, but damn it picked up in part and WOT....
 

a91what

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Mod Dude
Apr 6, 2011
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Added 5 to Initial Idle Values and it seem to help some.....I think surging is still my biggest nemesis, if i tap the throttle it clears up for a few min.
How did you take this log file?? only some of the data fields have been logged... I cannot see the most important fields.
I need everything... every last data field they are all important
 

a91what

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Mod Dude
Apr 6, 2011
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One of the biggest culprits i see for your surging idle is AFR swing... the fuel table needs more tuning.

I see one of the culprits being how the ignition table is setup right now, I have an idea of what may help...

The file named Steves ignition Table, load this into your IGN Table 1.

then set the idle advance settings the way i have them in the picture.
 

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Aug 24, 2003
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East TN
Now for questions. Why did you change what you did? What did you expect the results to be from the changes?...(.not questioning your abilities AT all, just trying to learn.)....as always, thanks for your time and advice.

Also why does the kPa on the timing tables go to 203kPa?.....my car is NA,
 
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a91what

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Apr 6, 2011
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Now for questions. Why did you change what you did? What did you expect the results to be from the changes?...(.not questioning your abilities AT all, just trying to learn.)....as always, thanks for your time and advice.
We are just making changes based on what the car needs, the first tune i sent you was adjusted with no datalog so it was a best guess.
1. I changed the timing table so the ignition table did not 'run away' at idle, ie. the timing went up quickly from 900 to 1300 before now it stays at a relatively the same amount in the entire idle region.
2. I expected exactly what we got, the idle is nice and smooth until the idle goes below 850 rpm at this point i see the idle valve begin to oscillate to hold it at the setpoint. now you need to tweak the idle settings to get the oscillation settled down. the surge is much less drastic.

Without being with the car and limited information it is difficult to set things just how the car likes it, every engine is a bit different.


Things to try next:
lower the idle valve gain [slider bar] this is in the closed loop idle settings.

Adjust the fuel..... I would help with this but there is no good way to explain what needs to be done without showing you.... or doing it for you, but that would not teach you anything
 

a91what

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Mod Dude
Apr 6, 2011
6,898
4,065
204
29
Hillsborough county
Now for questions. Why did you change what you did? What did you expect the results to be from the changes?...(.not questioning your abilities AT all, just trying to learn.)....as always, thanks for your time and advice.

Also why does the kPa on the timing tables go to 203kPa?.....my car is NA,
It goes to 203 because that is a table i use when building a base tune.... it covers most* installations it is the same table i am using on my car