Megasquirt owners thread

Audio, Electronics and Lighting questions and answers

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StanTheMan
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Re: Megasquirt owners thread

Postby StanTheMan » Wed Mar 22, 2017 2:40 am

Ok I've ordered about 5m of some braided teflon fuel hose rated at 250 deg and some PSI rating I'll never need in 10 lifetimes.
Apperntly ths stuff doesnt take on the smell either

I'll replace the fuel filter (which is brand new) in about a months time. I may also check on fuel pump & how dirty the tank may be at around that time.
Ghetto NA6 10 shades of red

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StanTheMan
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Re: Megasquirt owners thread

Postby StanTheMan » Tue Apr 11, 2017 2:56 pm

Red_Bullet wrote:Injector Dead Time. (latency)

I've been having problems with hot start which got me researching injector dead time. I'm running RX-8 yellow injectors 440 cc. Part number 195500-4450.

Anyway I came across some info from the rotary people regarding these injectors.

6.5 Volts 2.866ms
7.75 volts 1.901ms
9 volts 1.409ms
10.25 volts 1.095ms
11.5 volts .821ms
12.75 volts .660ms
14 volts .510ms
15.25 volts .411ms
16.5 volts .287ms

Doing some maths reveals

At 13.2 volts the deadtime is 0.6ms

which in megatune converts to a dead time table table of:
7.75 volts 317%
10.25 volts 182.5%
11.5 volts 137%
12.75 volts 110%
13.2 volts 100%
14 volts 85%
15.25 volts 68.5%
16.5 volts 47.8%

Going to load up these dead times and will report back results. I note that at 13.2 volts the deadtime is 0.6ms, which is a lot less than the Tunerstudio default of 1.0 ms

how did you go with that Red Bullet?
Received the Rx8 Injectors today.

Dead times are anywhere between 0.6-1.0 researching on the net

its going into a MS2 PnP the assumption that
the Battery Voltage correction is Dead time/voltage
If was to set the dead time around 0.8ms that would make the correction at 0.060ms ?
Ghetto NA6 10 shades of red

Red_Bullet
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Re: Megasquirt owners thread

Postby Red_Bullet » Tue Apr 11, 2017 5:42 pm

I tried those settings briefly but was too far down the road with my tune anyway. It was ages ago but I do recall it running really rich at idle (I think). Couldn't be bothered with investing more time in the low duty cycle area of the tune so I just returned to my original settings for dead time.

My hot start issues were related to too much fuel during hot start. Leaned that out and fixed my hot start issues.

If I was tuning from new I would be happy to give those dead times a go.

Red_Bullet
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Re: Megasquirt owners thread

Postby Red_Bullet » Tue Apr 11, 2017 8:11 pm

Correction to above^^^^^

Using the modified Dead time table made it run LEAN at the low duty cycle area. I couldn't be bothered fiddling with it as detailed above as it was already dialled in. So I went back to original table.

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StanTheMan
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Re: Megasquirt owners thread

Postby StanTheMan » Tue Apr 11, 2017 8:25 pm

My idle just went super rich.....
but it starts bewtyfully.

My old injectors were totally flocked. it runs sooo much smoother OMG!!!!!
Ghetto NA6 10 shades of red

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Lokiel
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Re: Megasquirt owners thread

Postby Lokiel » Fri Apr 21, 2017 9:06 pm

I'm trying to get my Android MSTrackIt App running on MS2s (currently running on MS3s) and StanTheMan has been assisting me with this (see http://mx5cartalk.com/forum/viewtopic.php?f=81&t=74657).

On the MS3, the mainController.ini file defines the vehicle speed in variable "vss1_ms_1", Vehicle Speed Sensor 1 in metres per second, and I use that to retrieve the vehicle speed.

Scanning through the MS2's mainController.ini file I can't see anything that looks like vehicle speed in the [Datalog] and [OutputChannels] sections.

How is speed retrieved from the MS2?
Is it calculated from multiple MS2 values and if so, which ones?

Any help appreciated.
Don't worry about dying, worry about not living!
Garage Thread: http://mx5cartalk.com/forum/viewtopic.php?f=57&t=41091

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Lokiel
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Re: Megasquirt owners thread

Postby Lokiel » Fri Apr 21, 2017 9:14 pm

Just did a search on http://www.msextra.com for this.

jsmcortina's response helped clarify this http://www.msextra.com/forums/viewtopic.php?f=101&t=61148:

"There is no speed-sensor function in MS2. You need MS3 for that.
Analogue inputs can be datalogged. See section 4.10 in the Setting Up Manual http://www.msextra.com/doc/pdf/html/Megasquirt2_Setting_Up-3.4.pdf/Megasquirt2_Setting_Up-3.4-82.html "


Now I love my MS3 even more!
Don't worry about dying, worry about not living!
Garage Thread: http://mx5cartalk.com/forum/viewtopic.php?f=57&t=41091

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StanTheMan
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Re: Megasquirt owners thread

Postby StanTheMan » Fri Apr 21, 2017 9:18 pm



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