I'm thinking of making my own piggyback... - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-27-2007, 09:00 PM   #21
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Re-inventing the wheel sometimes becomes profitable, it seems to work for the music industry very well what with all the crap they pump out lately.
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Old 10-27-2007, 09:15 PM   #22
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I'll make a wager that this never gets any further than an arguement on this board. Good luck re-inventing the Emanage Ultimate.
an argument which will probably spiral out of control and result in his ban
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Old 10-27-2007, 11:25 PM   #23
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ban for what? im not the one creating an argument.

as i mentioned before - im only doing it for sake of it. i mean, why not do it? i have resources to make it work and i feel like i need to refresh my c/c++
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Old 10-28-2007, 01:21 AM   #24
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I can widdle toothpicks from sticks, but Id rather take the butchers word for it... Thats not right..
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Old 10-28-2007, 01:32 AM   #25
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If you are going to do this and are serious about it then I urge you to design so it allows the passing of emissions tests. If you can do that then you have my business.

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I can take a good look at a T-Bone by sticking my head up a bulls ***, but Id rather take the butchers word for it... Thats not right..
Fixed
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Old 10-28-2007, 04:19 AM   #26
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well, it will never be street legal because emission tests cost $$. the idea is that stock ecu controls most of the things and this piggyback takes control of fuel and/or ignition at specific point which is user defined. basically you can have your stock ecu handle cranking, idle, etc, but set piggyback to take over when you floor it or start getting into boost. possibilities are endless.
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Old 10-28-2007, 04:30 AM   #27
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Go for it. I think there may be a sweet spot between Bipes and EMU, especially if you keep your prices <$200. Maybe FM will pick you up and replace their Voodoo card

I don't know much about piggy backs. I assume you listen for injector and ignition pulses and modify them (ie., you don't calculate them yourself). You mentioned c/c++ so I assuming you're using a SW loop. What processor do you plan on using?

Have you considered using a FPGA/DSP? It seems a natural for delaying and modifying pulses. Xilinx sells test boards fairly cheaply (~$30). I had considered using something like that to modify MS's signal for sequential injection but decided that my tune was bad enough that it wouldn't make a difference.

Just checked Xilinx's site and the prices for FPGA/DSP development kits are higher than I thought (~$300). The non-DSP kits are $30.

http://www.xilinx.com/xlnx/xebiz/des...NavPick=BOARDS
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Old 10-28-2007, 09:40 AM   #28
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Uh urban to be effective it would be very nice to be able to drive injectors on it's own instead of modifying the stock signals. Ultimately something like what we do on a parralel MS install. It just wouldn't need boost control or some of those other features.
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Old 10-28-2007, 12:58 PM   #29
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Hey Guys I think i might have found a company to produce valves for us. I just need to know what specs we want.

Oviously were doing a 2 -way valve, SS 304 or 306 doest matter (unless someone has preference).

Something we need to discuss is normally open or closed. I would say closed because I am not worried about a failure, and I would rather not have the valve powered when not in use, but its probably safer to normally open, if power fails to the valve the valve would remain open.
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Old 10-28-2007, 01:04 PM   #30
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Do you mean a high speed valve loki you are in the wrong thread if you do.
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Old 10-28-2007, 02:01 PM   #31
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Quote:
Originally Posted by magnamx-5 View Post
Uh urban to be effective it would be very nice to be able to drive injectors on it's own instead of modifying the stock signals. Ultimately something like what we do on a parralel MS install. It just wouldn't need boost control or some of those other features.
If you drive it on your own you would need A-D converters for CLT, IAT, and MAF plus RPM and crank position at a minimum. if you modify the stock signal, assuming this is for boosted applications and the main goals are limited to using larger injectors, retarding timing on boost and enriching the mixture on boost, all you'll need is 1 ADC for a MAP sensor.

Magna has a point, though. You might want to pick up a basic MSII kit and only install the circuits you need (no VR sensors) as a learning project. The MS2E code base is in C and is reasonable easy to modify and compile.
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Old 10-28-2007, 02:10 PM   #32
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go for it urban as long as you get it done faster than whaaamx5's 3" exhaust :gay:
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Old 10-28-2007, 10:17 PM   #33
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i am thinking about doing a fail-safe application. basically you can either set it to modify stock pulses so you can use bigger injectors or completely take over fuel/spark tables.

basically, one think i hate about megasquirt right now is the fact that you have to set dwell and **** like that. i would rather have stock ecu do that for me and just modify maps to fit my needs.

i guess i can always make it do both if someone prefers it.

right now i am assembling a test bench so i can do work on it in safe environment and not be able to fry another costly thing on my car.
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Old 10-28-2007, 10:20 PM   #34
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I love that I can set the dwell for my COPs.
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Old 10-28-2007, 10:22 PM   #35
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So this is kind of like the AEM F/IC? They're $350. Can you estimate a cost for these?
The FIC will let you run any injectors, it has huge fuel/spark maps, it just modify's the stock signals, can be made PNP with a boomslang, has USB integration, and is based on map.
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Old 10-28-2007, 10:23 PM   #36
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yeah, but i dont exactly like it after i fried my coil pack... thats why i want to make it an option - either have stock ecu drive your coil pack or have this piggyback take over. too bad megasquirt doesnt let you do that...
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Old 10-28-2007, 10:24 PM   #37
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controller - $149
wires - ~$5-10
software - free
sensors - depending on application
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Old 10-28-2007, 10:32 PM   #38
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Megasquirt can be run controlling fuel only, it's all in your wiring. The whole advantage of controlling your coils is being able to adjust your timing without just setting a base timing and dealing with crappy lowend out of boost or having to use a seperate device to pull timing.

Sounds like a very affordable solution, going to be interesting to see what you come up with.
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Old 10-28-2007, 10:35 PM   #39
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the problem is that i want to control my timing but i want to skip BS of setting dwell and crap like that. in my opinion it is only needed if you use aftermarket coils or cops or something like that. in my case i use stock coil pack and i just want to adjust my timing map. it is absolutely possible without messing with dwell settings but not with megasquirt since it is full standalone if you run fuel and timing.

bipes is a good solution but the problem with it is that you can only pull timing but not add. i want to be able to do both with either custom map OR based on whatever parameters/rules you specify to either add or pull timing from base settings. in second scenario i want to be able to do this:

base timing: 15
inputs: pressure, rpm, intake temperature.
rule: pull one degree of timing per 1psi of boost if intake temperature is above "normal", otherwise add use rpm map to determine preset degree of timing if intake temperature is below "normal"
"normal" intake temperature: 100 degrees (just to keep things simple)

case 1:
- pressure: 10psi
- intake temperature: 120 degrees
- rpm: 5,000
- timing: (oem ecu timing for specific condition) - 10 degrees

case 2:
- pressure 10psi
- intake temperature: 90 degrees
- rpm: 3,000
- timing: value from cell in custom map based on specific pressure/rpm

i want to make these rules as much customizable as possible

Last edited by UrbanSoot; 10-28-2007 at 10:45 PM.
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Old 10-28-2007, 10:47 PM   #40
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I personally think there is a market for a CHEAP specialized system with no tuning capability. Look how well DIY's done w/ the PnP. Specify the exact injectors to be used and cap the boost at X psi. That market may not be on this board but it's there.

This doesn't sound like what your trying to do, though. I still wish you good luck but I urge you to keep it simple at first and build on that.

Keep us posted.
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