
gennady gurov







finally finished up the wiring and fired the thing up, just need to tune it now:
http://www.youtube.com/watch?v=AX80NN61aX0
megasquirt bias resistors removed:
harness ran through the firewall:
wiring mess i've accumulated:
temperature sensors reading the same, one window is obd2 reader, another - megatune
lc1's output 2 configured for a linear output:
engine running:

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Roger Steadman


no clue what any of that is but cool i trust you know what it is

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Richard Greer



you know gurov, i would have figured you wouldnt have a wiring mess like that on your floor board, but then again i also thought you wouldnt have a shit ton a gauges in your car either. its cool you got it up and running, when you going to take the plunge and hook up the ignition?
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racer X





ooo hmm 

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Patrick

what are the bias resistors for? sorry i'm a MS newb but have plans for one when I graduate

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gennady gurov







speedjunkie wrote:
you know gurov, i would have figured you wouldnt have a wiring mess like that on your floor board, but then again i also thought you wouldnt have a shit ton a gauges in your car either. its cool you got it up and running, when you going to take the plunge and hook up the ignition?
once i log enough of what the stock ecu does with timing to be able to tune the HQR and this car as close to stock timing curve as possible.
the wiring mess should get cleaned up... it's really just a bunch of grounds and a bunch of power wires going places...

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Richard Greer



the bias resistors he is talking about is so the megasquirt can interpret the stock inatke temp and coolt temp sensors and display the correct reading in megatune
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Richard Greer



gurov wrote:
speedjunkie wrote:
you know gurov, i would have figured you wouldnt have a wiring mess like that on your floor board, but then again i also thought you wouldnt have a shit ton a gauges in your car either. its cool you got it up and running, when you going to take the plunge and hook up the ignition?
once i log enough of what the stock ecu does with timing to be able to tune the HQR and this car as close to stock timing curve as possible.
the wiring mess should get cleaned up... it's really just a bunch of grounds and a bunch of power wires going places...
your just going to keep the timing stock?
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gennady gurov







bartak007 wrote:
what are the bias resistors for? sorry i'm a MS newb but have plans for one when I graduate
it's used to measure the resistance of a thermistor as a voltage.
5v is applied through a resistor to the thermistor connected to ground, and voltage is measured at the junction of two resistors, i.e. past the bias resistor.
since the stock ecu is already connected to the thermistor, you can simply read the voltage and convert that to temperature.
you would leave the bias resistor in the megasquirt if you were installing new thermal sensors

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Richard Greer



so you completely removed the bias resistors in the megasquirt? havent heard of doing that? can you explain alittle more?
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gennady gurov







speedjunkie wrote:
gurov wrote:
speedjunkie wrote:
you know gurov, i would have figured you wouldnt have a wiring mess like that on your floor board, but then again i also thought you wouldnt have a shit ton a gauges in your car either. its cool you got it up and running, when you going to take the plunge and hook up the ignition?
once i log enough of what the stock ecu does with timing to be able to tune the HQR and this car as close to stock timing curve as possible.
the wiring mess should get cleaned up... it's really just a bunch of grounds and a bunch of power wires going places...your just going to keep the timing stock?
for now... it is my belief that the stock ecu does a hell of a lot better job at managing boost timing than we give it credit for. it's going to be logged via LMA3 (auxbox) and the external crank angle wheel i just added for the megasquirt.
next step for this would be to figure out how much off my timing is (fuel doesn't require very precise timing), and enter these things into the LMA3 so i can graph some rpm vs map vs ignition graphs and make up an excel sheet for this.

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Richard Greer



you sure have a better approach at this then i did when i tuned my neon, i guessed at the fuel table and spark tables and still managed to get a running and driveable tune that got 20 mpg in an hour, of course with the help of my wideband, a.f target table, and autotune (for the fuel part)
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gennady gurov







speedjunkie wrote:
so you completely removed the bias resistors in the megasquirt? havent heard of doing that? can you explain alittle more?
sure:
R1 is the bias resistor
the junction between the two is the output voltage
R2 is the thermistor
voltage is applied via R1 to ground via the thermistor.
see more here: http://www.megamanual.com/v22manual/sharesen.htm

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gennady gurov







speedjunkie wrote:
you sure have a better approach at this then i did when i tuned my neon, i guessed at the fuel table and spark tables and still managed to get a running and driveable tune that got 20 mpg in an hour, of course with the help of my wideband, a.f target table, and autotune (for the fuel part)
i plan on using megalogviewer to tune the fuel
it's so easy. cause you can keep ego correction on and it will still be able to adjust the maps properly.

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Richard Greer



yeah well when i tuned my neon megalogviewer didnt have that spiffy fuel tuning crap so i had to do it the "hard way". That sure is interesting about the sharing sensors with the stock ecu, all the neon guys arent doing that, they are getting resistors that are the correct value and putting them inplace of the pre-existing bias resistors in the megasquirt box. I guess if you do it that way (the way the neon guys do it) you dont have to mess with easy therm. I could care less though, I am using the gm sensors and I also dont have anything that closely resembles a stock pcm anywhere near my car.
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gennady gurov







speedjunkie wrote:
yeah well when i tuned my neon megalogviewer didnt have that spiffy fuel tuning crap so i had to do it the "hard way". That sure is interesting about the sharing sensors with the stock ecu, all the neon guys arent doing that, they are getting resistors that are the correct value and putting them inplace of the pre-existing bias resistors in the megasquirt box. I guess if you do it that way (the way the neon guys do it) you dont have to mess with easy therm. I could care less though, I am using the gm sensors and I also dont have anything that closely resembles a stock pcm anywhere near my car.
i will actually post the easy-therm files and the firmware that i used for the MS1 boxes. the MS2 box i tested today can do it online. and that worked perefectly too

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Richard Greer



sweet, so have you thought about getting into the business of building and selling these megasquirts to the nissan community (mainly the se-r's and spec-v's)?
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gennady gurov







speedjunkie wrote:
sweet, so have you thought about getting into the business of building and selling these megasquirts to the nissan community (mainly the se-r's and spec-v's)?
i've thought about it. but it would have to be somewhat hand-picked and elite crowd, and i really wouldn't make any money off it. it would be more of a service.
like right now, i have 3 boxes sitting here, all 3 are capable of running the engine, both fuel and ignition. cheapest one being the v2.2 ms1 and most expensive one being the v3.0 ms2

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