Da P-Funk!

Team-
Is this a viable option for getting some timing advance and better fuel mapping for a na car with only intake and exhaust? The price is right - but the 'monitor' - not 'tune' or 'modify' makes me wary... Does it even cover our car? (It says 'not vehicle specific')
<see below>


Venom Engine Mgmt Systems - PB
Performance Control Module - Venom 400

The VENOM 400 Performance Control Module is an add-on control unit that features its own micro-controller. This module is connected to the vehicle's sensors and increase engine performance by monitoring the sensors output.
Note: The VENOM 400 requires no modifications to existing engine components and can be completely disabled at the flip of a switch, restoring performance back to original equiment specifications.

Click www.venom-performance.com for more information about this product.
Purchase Rating (1-10) Make Model Part Number Details MSRP Sale Price
New Not Vehicle Specific VENO V49-209 (93-94) 2.3L 293.96

Racing Beat

isn't that for nitrous applications...the problem is I thin that only adds fuel..if anything we need to elan out and stabilize our a/f maps

hughes412

hey Da-P, have you tried to contact this guy to find out exactly what it is, and if it is guaranted to work on pros? If not I can!

Da P-Funk!

No i have not tried - the website was 'down' or my server...

Yeah, give it a shot.

Let us knwo what you find out. If RB is right - it we don't need it!

Roddimus Prime

its a crock...it's a fuel adder and our ecu will override it anyway at WOT. This is the problem with almost all little piggyback controllers like the S-AFCII and so forth.

Spend the money to have good fuel control and buy the Haltech F10X from protegegarage.com I think he has them for right at $900 or so with the protege harness.

hughes412

Is there a code that Mazda has that can't be craked or something? I don't understand why someone can't make a chip or peggy back system that will work, they have them for so many other cars.

Da P-Funk!

Can we 'move' the crank sensor a few degrees to fool the ECU as to the base timing?

Roddimus Prime

nah, not worth it to fool with something like that. JUST MY OPINION THOUGH......not that it means anything.

vielster

If the RPM output is a simple analog voltage level output, and a throttle position sensor is in place, it'd be interesting to try and put together a small, cheap system that used just these two factors and manipulated the crank sensor to change the ignition timing of the motor. You could easily do this with a $2 microcontroller, the tough part would be writing the code and figuring out the output scheme for the crank sensor....Man...if I had a shop and someone capable to work on the car with, i would definitely be all about doing the electrial and programming aspects once we figured out the scheme. Could probably put it together for <$50 and it'd be a programmable ignition system...might be worth some money too...damn...

Stueck

it only works between 1000-5000 rpm....

vielster

What only works between 1-5k RPM?

Da P-Funk!

Crank sensor? Why does it stop using the crank sensor above 5K RPM?
That doesn't make sense (to me - i am 'mechanical' not 'lectronic-ee). The computer should be using the base timing as a reference point to adjust from for RPM/fuel emisions tuning.

Vielster! Now you have me intrigued! You are getting close to what *i* see as the solution to bump our timing a wee bit! Follow that thought to a conclusion...

vielster

Here's a sort of Block Diagram of what the setup would basically look like.



The Code Would go something like this

{Initialization Code}
long currentRPM;
long currentThrottle;
While(true){
currentRPM = convertToRPM(ADC3);
currentThrottle = convertToLoad(ADC1); //converts fo level 1->100 based on plate position
if(currentRPM > 1000 && currentRPM < 1500) { //Idle Speeds
CrankOut = ADC2;
}
if(currentRPM >= 1500 && curent RPM < 2000){
switch(currentThrottle)
case 1,2,3,4,5,6,7,8,9,10: CrankOut = ADC2;
break;
case 10,11,12............. : CrankOut = ADC2 - 5;
break;
case 20,21,22............. : CrankOut = ADC2 - 8;
break;
//finish cases up to 100
}
if(currentRPM >= 2000 && currentRPM < 2500){
switch(currentThrottle)
case 1,2,3,4,5,6,7,8,9,10: CrankOut = ADC2;
break;
case 10,11,12............. : CrankOut = ADC2 - 2;
break;
case 20,21,22............. : CrankOut = ADC2 - 4;
break;
//finish cases up to 100
}
//Finish for all RPM up through 7000 changing ignition timing based on RPM
}


I'm not sure exactly how ignition timing is supposed to relate to RPM and Load, so what I did in the code might be wrong, but it's just an example. If a mechanical guy could tell me how much I need to advance or retard the timing, it could be manipulated. Additionally, this scheme could be easily made to work for every 100RPM instead of 500...just more code. Since the ATiny26 is programmable, it could be updated with new programs if a different ignition timing is found to be more beneficial. Of course this sytstem isn't nearly as useful since we don't have control over the fuel/air mixture. there are still 6 more ADC (analog to digital converters) and many more outputs that could be used, but it would be very complicated code. Could easily incorporate an on/off switch as well. Anyway, I've just been thinkin about it so thought I'd put it out there.

Roddimus Prime

wow.....I was lost at the diagram!

You obviously know your stuff or are a GREAT BS'er!! I'm banking on "knows your stuff"

hughes412

Well you lost me at the diagram, just do it and let me know if it works!