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Topics - mr_g

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There have been a lot of years down the road as I am making new vems installation in my new car, I see that still there is no progress on vems 4.0 based on ARM proc.

As I was developing some gadgets like gnss based car alarm systems,  jetski control etc,  I was using atmega128 just like vems. But this is ten years later and atmega is slow and small and absolite embedded controller. And starting of this year I have switched to stm32f105 ARM cortex m3 controller with 2 canbus and USB periferial on-board.

So, as I am working on canbus on many cars with my alarm system. Well actually reverse engineering on canbus on many cars and as my new project car is 2001. Old Astra coupe bertone I woould like to use my knowledge and implement my canbus system in Astra just like in new vw or audi.

So, I would have 5 or 6 ecus around the car (for every door) to control everything over canbus. Why? Because I can. :-)

So let's get to the vems. I need some kind of input output interface to vems so I can relay everything to canbus and back. Vems would just control the engine. Everything else would relie on canbus.

I have s257sx-e on 4 cil and small engine compartment in twin scroll layout.
What to do? Put 2 egt sensors in crouded pipes or just one after turbo?
Or go crazy and put 4 egts right on runners?

Solenoids / Possible pwm outputs? Etc low z and boost
« on: August 05, 2017, 02:13:03 am »
Is there any other pwm output beside oc0 for dbw or etc?
I don't want to lose low z pwm output.

Configuration / injector group table: How to setup injector outputs
« on: July 28, 2010, 07:54:30 am »
The engine is firing cylinders 1-3-4-2

In witch order to to setup injector spraying?

Configuration / How to use anytrim with fuel pressure sensor on LPG?
« on: July 27, 2010, 12:03:00 pm »
LPG doesn't have linear fuel pressure regulator like gasoline, and also, pressure regulator is slower than MAP changes...

normally LPG piggyback that controls LPG injectors has a LPG pressure sensor that is used to compensate this kind of a issues with fuel pressure regulator...

I'm not using LPG piggyback anymore as VEMS is fully running the car both on LPG and gasoline, but this issue is present and compensated with closed loop...

So I was wondering could I use this pressure sensor and anytrim for this issue? The problem is that LPG pressure sensor is absolute pressure sensor, not relative one, and anytrim is based on relative reading...

What does this mean? What is online vs realtime? ???

quote: "The tune by stats in online mode is being replaced by a realtime version"

Software / new vemstune doesn't have log "replay" button
« on: April 19, 2010, 09:08:04 pm »
This months vemstune, doesn't have log "replay" button anymore?! Is this a bug, or a feature? :D

How the realtime replay saved log, without the replay button?  :'( ???

Wiring & Sensors / EGT senzor readings jumping around?!
« on: April 03, 2010, 04:51:45 am »
EGT reading is jumping all around...  ??? But only when I'm driving on LPG. On gasoline it is just fine...

So, I was thinking that the reason is lowZ LPG injectors and active flyback connected on, and installed inside the VEMS box...

I have EGT wires bought in the vems shop (no wire ground shield) and the EGT sensor also (with wire ground shield)..

Any ideas?

BTW, Roadspeed is jumping around also (only on LPG). I use signal from ABS sensor, and LM1815 and frequency divider (by 2)...

Configuration / VEMStune and knock setup
« on: March 04, 2010, 10:03:06 am »
What is the recommended settings for knock sensor to start with?

How to found out the correct settings for my engine?

I have opel 2.0 16v C20LET with 86.5mm bore size and stock bosch knock sensor....

Software / how to measure the speed of wheels? Which algorithm?
« on: February 15, 2010, 08:17:33 pm »
I have an intellectual dilemma, on creating algorithm for traction control module. Approximately I have:

700hz front approx 100kmph
430hz rear approx 100kmph

And twice as many pulses (interrupts) in the processor ... Let the processor run at 8MHz or 16MHz if necessary (the same as in VEMS v3)...

So, if I count the pulses per second, I would have each measuring 1 second late... This is not usable for TCM...

If I measure the time between 2 pulses, around 0.7ms, there will be an error in recalculation of the time in the speed will be greater...

What I thought was to measure the duration of 10 or 50 pulses... This would come in the time of 7ms or 35ms... Delay of 35ms for TCM electronics is not so bad, and the error would have been 10 or 50 times less then measuring only one pulse...

Or combine all those undergarments like every 0.1s, measure number of pulses, and meassure last pulse that didn't complete?

BTW, at 16MHz, 1 clock stroke is less than a micro-seconds, so I think that the processor must be fast enough to do 4 wheels and an algorithm for reducing the torque...

How does VEMS measure speed of a wheel or a speed of a engine?  ???

Configuration / VEMS + Turbo + water injection + dry nitrous shot = ?
« on: August 31, 2009, 11:10:38 pm »
I have VEMS, wbo2, egt, with 680cc siemens injectors, opel redtop 2.0 16V (C20XE/C20LET) engine, with 8.8:1 CR wiseco pistons, T3 turbocharger trim 60 with 0.63 ar turbine housing (300-350HP)...

I will put water injection just in case (maybe with some methanol), and I was thinking about adding nitrous...

My primary idea was to add dry nitrous shoot, small amount like 20-40HP before IC just to cool down IC on hot summer track days where IC doesn't have good efficiency.....

But, now I'm thinking about a larger amount of nitrous because turbocharger has big turbine housing and smaller compressor housing, so it could eat up a lot of nitrous... Maybe 100HP dry shoot before throttle body..

Does anybody has any experience with setup like this? VEMS + dry shoot? Or the wet shoot would be better? I would prefer dry, it's less piping's and fittings, and I suppose that VEMS supports nitrous injecting...

Can VEMS control everything? Boost, dry nitrous shot and water injection at the same time?

Ignition / COP's, LPG a lot of missfires...
« on: June 13, 2009, 08:15:32 am »
I had a lot of missfires. On fuel and wasted spark, I had missfires on idle, but no missfires on driving. So I have installed COP's in wasted spark mode... There are less missfires on fuel (gasoline), but on LPG I have less missfires on idle, but when I press throttle, LPG wouldn't go above 3000rpm...

When I press harder, it would spin the turbine, just as a launch control is on (witch is disabled)... There is so many missfires that LPG wont go over 3000rpm! What is wrong?  ???

Software / rpm output when engine off.
« on: June 06, 2009, 12:05:07 am »
I have found out, when the engine is off, rpm outputs the signal like 10 time lower frequency, cca 100rpm... My response was: WTF!

Does anybody know anything about this?

Software / AIM and other protocols
« on: June 05, 2009, 10:36:22 pm »
Is there any documentation about AIM protocol and new VEMS protocol?

Standard AIM doesn't have injector time. Can this be added?

If I understood correctly, VEMS is sending this data (AIM) through UART, asked or not? What is the default frequency of sending it?

Software / Megatune command line options
« on: May 23, 2009, 12:29:49 am »
Every time I start it up must select table size and ok. It's pretty hard to do on 8'' touch screen while driving...

Is there a way to put it in command line string to pick one I want every time I start it up?

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