VEMS Community Forum
Members => Projects & Installs => Topic started by: Dangerrous on June 10, 2012, 02:43:50 pm
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Just thought I'd introduce my project that requires a standalone ECU
Kit car using the Audi 1995 ABZ v8 4.2 married up to an 01X 6 speed gearbox
Current specs from the engine:
Make: Audi
Year: 1995
Engine: ABZ
Type V8 4.2ltr
Sensors:
Throttle position sensor: 3 wire potentiometer controlled by ecu
Closed throttle position : two wire, ground sent back to ecu when closed
Engine speed sensor: 2 wire inductive sensor with ground shield
Cam Position sensor: 3 wire Hall sendor 5v? supplied by ECU
2 Knock sensors: piezo- electric 2 wire with ground shield
Wide Band Oxygen sensor: 5-wire LSU4 (to be purchased)
Engine coolant temperature sensor: 2 wire sensor
Intake air temperature sensor: 2 wire ptc resistor
Manifold air flow sensor 4 wire, 2 for heater and two for feed back to ecu resistance measured
Manifold Absolute Pressure sensor: not installed -Please advise-
Outputs
Injectors:
2 wire 12v supply on/off saturated type 15ohm resistance
Coils/plugs:
Final output stage from ecu step up transformer to coil
Coil on plugs (CoP) supplied with 12v ignition signal from final output stage
Idle air control valve: 2 wire variable voltage to a motor, loaded against a spring
Evaporative emission canister purge regulator valve: 12v solenoid valve pulsed when the engine is running, started after oxygen sensor has warmed up
AC signal to ECU
Output signal to Coolant fans relay if possible three stage
I need to draw up a purchase bundle
Any advice
Cheers
Guys
Darren
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Purchased my vems and associated bits.
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Hi all, I'm currently wiring up the vems unit to all the sensors but can't find the second knock input, I ordered this in the purchase bundle. I notice that some wiring schematics possibly use analogue channel 1 (EC18), my pin out spec just says 'Wire in (depending on spec)' The bottom of the pin out page even says knock sensors- 2
Any help would be appreciated
Darren
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With your ECU you got a paper, this tells you in detail what pins on the EC18 connector are customized to your setup and you should find the knock sensor input pins there.
Given that this feature doesn't even work with current firmwares I would bother with the knock sensors much later but make the wiring 99% done.
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The 'wiring schematic' for my bundle is the paper specific to my purchase, there's only one knock sensor input although I requested two due to it being a v8.
I'm just wondering if analogue channel 1 on the EC18 is wired up for knock sensor two but not defined on my pin out paper
(http://i8.photobucket.com/albums/a13/dangerrous/pinoutschematic-1.jpg)
I'm trying to clear up any doubts before I run power into the ecu and test the sensors
Cheers
Darren
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There are always two papers, you're looking for a spreadsheet with the EC18 pins listed top to bottom.
It does specifically say this in the webshop for the knock options :
Knock signal: EC18/1 (knock1); EC18/2 (knock2, only if dual-knock option selected). Knock GND: EC18/17 (also used for RS232 GND, internally connected to EC36pin26).
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thanks, checked the other info (found under the keyboard) pin 2 is knock 2 and not channel 5
;D
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I've got some valves for the ecu to control
i) variable change over manifold valve 13.4v/28.5ohms=0.47amps or 470mA
ii) charcoal evap recovery valve 13.4v/28.5ohms= 0.5amps or 500mA
iii) variable air control valve (idle valve) 13.4v/8.3ohms= 1.615amps
I read that (protected against spikes) the p259 pull up/down can handle 350mA safely or fries!
The stepper can handle 1amp, plus dnb has abused these without a problem
I'll control the first two using the steppers (rated at 1amp) but I'm concerned about the idle solenoid. I understand that it's roughly controlled using pulse width modulation ie flashing light effect but at 100% it will draw over 1.5amps is this fry time for the stepper controlling it If so what can I use to control the solenoid, all the fets and igbts are used
cheers
Darren
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I would fire injectors in pairs, and get four injector outputs available for other use. It won't affect the running of the engine even to a small extent, you'll probably not notice. Especially if you fire them every revolution and pair the injectors in the "wasted spark" pairs.
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Thanks, that's definitely an option, If I have to I'll go down the wasted spark route.
Cheers
Darren
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I have VEMStune installed and now I'm checking the sensors, both the clt & mat sensors are showing -40c, I have read loads of documentation and cannot make head nor tail of it, am I missing a utility program to make sense of the hex tables and guidline instructions, my computer (tried on both - workshop using xp, home using win7) open them in notepad/noteword and/or excel, I need some giudance as I'm going square eyed trying to get around this very simple task. Is this task detailed anywhere for the latest software as most guides seem at least 4 years old and don't relate to VEMStune.
I've drawn up a realtime table of my bosch clt sensor, and I'm happy with the result for a 2063 table, but which one?
hope someone can direct me to a good guide that I've missed
cheers
Darren
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-40 usually means open circuit. You can see the signal voltage point in CLT and MAT graphs. If it is 5V you have open circuit.
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Cheers, found a break in an original joined earth path for the clt, mat and knock sensor shield, diagnosed within 2 mins, this was the only earth branch I hadn't renewed (Soldered together), also decided to use my own sensor table for clt and mat, I've got two detailed graphs drawn up from testing the sensors, both now reading within 1degC.
Thanks for the help again guys
;D
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It's alive!!!!
Although running really rich and not ticking over yet The throttle response is amazing, When I bought the Audi I drove it for a couple of days and it was a very smooth gradual drive, It now seems like a totally different power plant. Very pleased ;D
I'll post a vid of the engine running when I've sorted the VR tables etc out.. EFI express have posted a video on youtube with the same sort of throttle response
D
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opps!
tried driving too much through steppers, plus accidently left on valves
I've blown the control/stepper chip
What do I do now?
(http://i8.photobucket.com/albums/a13/dangerrous/myboardblownsteppercontrol.jpg)
Can I just buy a new one?
Cheers
Darren
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Been looking around..... is this true for our vems circuitry, Stacking stepper chips for extra current?
'Faster, cheaper, smaller, better, right? The SN754410 Quad Half H-Bridge is just that. Capable of driving high voltage motors using TTL 5V logic levels, the SN754410 can drive 4.5V up to 36V at 1A continuous output current!
For even higher current applications, it is possible to physically stack two devices on top of each other to get almost 2 A of drive current.The SN754410 is a quad half H-bridge IC. This allows the chip to either control 4 motors in one direction using the 4 half H-bridges or to control 2 motors in both directions using a full H-bridge for each motor.
The following shows the connections for controlling 2 motors in either direction using 2 full H-bridges'
(http://i8.photobucket.com/albums/a13/dangerrous/sn754410-connections.jpg)
This would save/solve so many power issues I'm reading about on the forum ;D
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I've torn the car down for a respray/rebuild, so away from the car area I've soldered in the new stepper chipS.
I'll drive my control valves via a secondary relay box to limit the strain on the chip, I'll also use a flyback diode (as recommended by Hilly amongst others) for the idle solenoid.
As the solenoid has been checked at 1.6amps full load, I'm hoping a zener diode and the stacked chips will fair a little better than my last attempt.
I've metered the new chip to it's various outputs and they are all fine, I caught one of the copper layers so was mindfull to double check this one
(http://i8.photobucket.com/albums/a13/dangerrous/vemsstackedstepperdrive.jpg)
(http://i8.photobucket.com/albums/a13/dangerrous/sideviewstackedstepperdrive.jpg)
you can just see the lifted copper strand on the second picture, it's the second pin on the right
D
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Hi, I realise it's been a while since my last post but I'm getting ready to put the engine back in the car, so, on the vems side, I need to clarify my safe power issues with my idle solenoid valve, I'll be bypassing the internal chip to a more robust ON SEMICONDUCTOR,NTD5867NLT4G,MOSFET,N CH,W DIODE,60V,20A,DPAK but I still want to install a flyback diode, any suggestions as to what one would be sufficient for a 1.6amp collapsing field on 12volts?
cheers in advance
Darren
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Okay, so tested the new stepper chips- FAIL!
I did this mod sometime back and I've been reading up on and watching electronics tutorials just to get my head around the inside of the vems. The unit is out of warranty and it was my mistake that blew up the stepper chip, so I took it to a friend who confirmed that all 4 logic circuits to the stepper were okay ;D The stepper's duties were to run 3 solenoid valves and a fan relay for extra air circulation in the engine bay, too much for a little ol' stepper. Here's where Hilly's advice has been taken on board for the board, I have removed the stepper chip and wired up Four 3amp Hexfets with schottky diodes in flyback configuration for protection.
I plugged in the board and it all works, v happy ;D
Two smiley faces, must have been a good day
D
(http://i8.photobucket.com/albums/a13/dangerrous/stepperremovedfetswithflybackinstalled_zps18317ac8.jpg) (http://s8.photobucket.com/user/dangerrous/media/stepperremovedfetswithflybackinstalled_zps18317ac8.jpg.html)
Total cost £10
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Here's a vid of the engine running, still needs a vast amount of tuning, I'm going to alter the exhaust for a higher pitched sound, I'm in discussion with my exhaust supplier/designer. The alternator bearings are shot, that's the metallic sound coming from the engine bay
http://youtu.be/YS06mgc-nlY
D
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Well almost 3 years later the engine is set up and dyno'd
Thanks to Gunni for his time and the guys at ATSPEED racing in Rayleigh Essex
https://www.youtube.com/watch?v=EJeQSuejAh8
Now to finally put on the body :)
D
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nice, and nice to see someone maps Vems in uk :))
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I've learned a lesson when it comes to aftermarket ECU's,
When it comes to really setting up an ECU, very few people actually know what they're doing.
Gunni explained every action he carried out, but to be honest I'd have to work on ecu's to fully understand the fundementals of programming.
Finding a capable vems programmer willing to work on the unit is hard work, even Gunni was so busy that we did most of the work while he was in Germany. (we used team viewer)
All of the dyno tuners that I contacted were limited to ignition, injection and ve tables, mention PID ICV and they run a mile.
I really don't know the answer, I'm not part of the ECU world to know who rules the UK for aftermarket equipment.
D
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I've learned a lesson when it comes to aftermarket ECU's,
When it comes to really setting up an ECU, very few people actually know what they're doing.
Gunni explained every action he carried out, but to be honest I'd have to work on ecu's to fully understand the fundementals of programming.
Finding a capable vems programmer willing to work on the unit is hard work, even Gunni was so busy that we did most of the work while he was in Germany. (we used team viewer)
All of the dyno tuners that I contacted were limited to ignition, injection and ve tables, mention PID ICV and they run a mile.
I really don't know the answer, I'm not part of the ECU world to know who rules the UK for aftermarket equipment.
D
people have to understand that there is 2 different things, ecu calibration and ecu mapping :) calibration is to make everything working properly, mapping is to make power from it :D
and every tuner have they own ecu brand what they like :))
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Hullo, I don't suppose you might post your config file for our inspection?
Cheers!
Ben
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no probs, i'll do it the weekend when i'm by the car
D
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Hiya, did you ever get to sharing that Map? I'm about to start on a similar project and although I'll probably go to Rayleigh for the tune, it would be good to have a simple map to get it running :)
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I can forward what ever you want, just let me know and I'll try to do it the weekend, (tune computer is also my work computer, which is at the head office till the weekend)
Darren