Megasquirt Users

Discussion pertaining to positive pressure E28s.
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Maddog
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Joined: Feb 12, 2006 12:00 PM
Location: Atlanta, GA

Megasquirt Users

Post by Maddog »

For all of you megasquirt users on the forum, what is your AFR at idle? I am trying to get an idea of what kind of good results other people are getting. I am running about 13.5:1 with 12 degrees of advance and my engine is very happy. I am curious to see if anyone has been able to get their engine to idle at 14.7 without the engine "hunting" at idle.
Last edited by Maddog on Jul 11, 2007 8:17 PM, edited 1 time in total.
T_C_D
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Re: Megasqquirt Users

Post by T_C_D »

Maddog wrote:For all of you megasquirt users on the forum, what is your AFR at idle? I am trying to get an idea of what kind of good results other people are getting. I am running about 13.5:1 with 12 degrees of advance and my engine is very happy. I am curious to see if anyone has been able to get their engine to idle at 14.7 without the engine "hunting" at idle.
We run 14 degrees at idle.

These motors typically do not like 14.7 at idle. I tune idle for smoothness not economy. 900rpm and high 13s do it for me.
FirstFives Dictator
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Re: Megasqquirt Users

Post by FirstFives Dictator »

Maddog wrote:For all of you megasquirt users on the forum, what is your AFR at idle? I am trying to get an idea of what kind of good results other people are getting. I am running about 13.5:1 with 12 degrees of advance and my engine is very happy. I am curious to see if anyone has been able to get their engine to idle at 14.7 without the engine "hunting" at idle.
That sounds good; it's all about making the motor 'happy'.
My worn-out m30 idles at about 35KPA warm.
Is yours similar?
Maddog
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Location: Atlanta, GA

Post by Maddog »

I have been idling around 40kpa. This was a bit higher than I wanted, but I haven't been able to get it lower.
Maddog
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Re: Megasqquirt Users

Post by Maddog »

FirstFives Dictator wrote:That sounds good; it's all about making the motor 'happy'.
My worn-out m30 idles at about 35KPA warm.
Is yours similar?
What RPM are you idling at and what advance are you running to be able to run at 35kpa?
rs4pro3
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Post by rs4pro3 »

my m20 either idles at around 12-13 at a low rpm real ruff idle, or 15-16 at a 1300 rpm idle
FirstFives Dictator
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Re: Megasqquirt Users

Post by FirstFives Dictator »

Maddog wrote:
FirstFives Dictator wrote:That sounds good; it's all about making the motor 'happy'.
My worn-out m30 idles at about 35KPA warm.
Is yours similar?
What RPM are you idling at and what advance are you running to be able to run at 35kpa?
14 degrees and 900-950

It's an e12 so I'm used to a little higher idle and no idle control
OldgreenE34
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Idle MegaSquirt

Post by OldgreenE34 »

I just got my car to pass Ontario Emissions with:

12 degrees advance
14.8:1 target and 3% authority to the wideband closed loop
47 KPa
1000 RPM
measured mixture - from 14.9 to 15.2

Emissions measured

CO% = 0.00
HC ppm = 10

the car idles like a stock E34 535 in terms of solid and smooth.

Dave
Brad D.
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Beamter
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Post by Brad D. »

OldgreenE34, are you using MS now or are you still using the Perfect Power SMT?
OldgreenE34
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Post by OldgreenE34 »

MS on the TCD 1988 M6
SMT-6 on the TCD 1990 535

Dave
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