Build me a stamp
maddog
Posts: 10
Hi looking for some one to build a controller for me. I want to use this on a race bike and change my ignition timming.
Can you use a stamp·to read inputs from a pickup coil A/C volts? This coil trips a S.C.R. in a controll box, I want to slow it down when the rate of change is to fast. Inputs from the pickup coil happen every time the crank shaft turns, and it can spin at a rate of·11500. RPM's When the crank turns at 6000 RPM's the input from the pickup coil is 100 per sec, and 116 per sec at 7000 RPM's anything much faster the stamp needs to slow the single down to the SCR. any one up to the task? Thanks
Can you use a stamp·to read inputs from a pickup coil A/C volts? This coil trips a S.C.R. in a controll box, I want to slow it down when the rate of change is to fast. Inputs from the pickup coil happen every time the crank shaft turns, and it can spin at a rate of·11500. RPM's When the crank turns at 6000 RPM's the input from the pickup coil is 100 per sec, and 116 per sec at 7000 RPM's anything much faster the stamp needs to slow the single down to the SCR. any one up to the task? Thanks
Comments
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Chris Savage
Parallax Tech Support
Maybe an SX or Propeller, should be able to do it.
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www.fd.com.my
www.mercedes.com.my
Using a Propeller IS a very good idea as it is by far the fastest at sampling the data. After all, what good is a racing machine with 2nd best hardware supporting it? It is all about speed, as usual.
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PLEASE CONSIDER the following:
Do you want a quickly operational black box solution or the knowledge included therein?······
Also, not knocking the Propeller, but if this is anything more than a learning project for yourself, you should highly consider some commercial alternatives for a tried & true device.· I see programmable low cost ignition controllers all the time in Elektor, EPE·et al.
Just because there is a commercial device out there, doesn't mean that one cannot explore improvements in both cost and design. A $1000USD device really justifies a lot of DIY. If it were $200USD, one might just buy it.
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PLEASE CONSIDER the following:
Do you want a quickly operational black box solution or the knowledge included therein?······
Just for example, check out Jaycar electronics (jaycar.com).· Search for 'ignition' - there are a couple of items there such as:
#KC5442 - Programmable High Energy Ignition System· - $89.95
This is Silicon Chip's most advanced and versatile ignition system yet and can be used on both two & four stroke engines. The system can be used simply to intercept and modify the factory ignition timing or turned into a stand alone ignition system with remapped timing, electronic coil control and anti-knock sensing. The unit will trigger from a range of sources including points, Hall effect sensors, optical sensors, or the 5 volt signal from the car's ECU. Timing can be mapped against engine load and RPM and adjusted in step as small as 0.5°.
#KC5443 - Ignition Coil Driver· - $44.50
Add this ignition coil driver to the KC-5442 Programmable Ignition System and you have a complete stand-alone ignition system that will trigger from a range of sources including points, Hall effect sensors, optical sensors, or the 5 volt signal from the car's ECU. The kit can be mounted close to the coil to minimise energy loss and the controller can be fitted inside the car. Kit includes PCB with overlay and all specified components.
#KC5444 - Knock Sensor - $16.95
Add this option to your KC-5442 Programmable High Energy Ignition system and the unit will automatically retard the ignition timing if knocking is detected. Ideal for high performance cars running high octane fuel. Requires a knock sensor which is cheaply available from most wreckers. Kit includes PCB with overlay and all specificed components.
These all seem to be based on projects published in Silicon Chip.· You might also consider searching their site for 'ignition' as there are several other related projects.
Those prices are low enough to consider for (almost) turn-key products.· Again, learning is one thing, but paying someone to develop and build a similar system would probably exceed that cost.
Post Edited (Agent420) : 5/9/2008 5:55:59 PM GMT
A few years back, someone developed a NOX system with Parallax products that was quite adequate. I think there is still info in the Finished Projects section.
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PLEASE CONSIDER the following:
Do you want a quickly operational black box solution or the knowledge included therein?······
http://www.bazzazperformance.com/index.php?page=shop.browse&category_id=4&option=com_virtuemart&Itemid=26&vmcchk=1&Itemid=26
maddog that is what you need. Why reinvent the wheel. You are a pro-team you should get the best made. Building one from scratch can be done it would take a little time and more than 1000 dollars to do it correctly. I would buy the one already made its going to save you so much time and money that way. Goodluck and if you get a chance PM your website or team pics of your race bikes ... Sounds like you have a lot of fun..
hook the + lead of a .1uf tantalum capacitor to the pickup coil of the bike without unhooking it from the ignition module (Splice it). Connect the - of the tantalum to a 2.2K resistor. The other end of the 2.2k will go to chassis ground later. Start the bike, hook up your timing light and note the timing. Ground the 2.2k resistor to the chassis and note your new timing. You may need to get some RPM into it before you will see a change as the pickup doesn't produce much voltage at idle. (I assume this is a reluctor pickup on your bike)
I am sure your final product will use a different component value for the amount of retard you need·but this is a good start. If this works, I can direct you further.
I have done this on my '81·Corvette and a simple retard of the timing with this method really knocks the wind out of the 500+hp motor.
Luck!
kenjj