Looking to build a system based on a notebook, software and sensor for tuning a weber based bmw. Looked at the complete systems from diyautotune (LM-2 or gauge based wideband o2 sensor) I would like to use my notebook in place of the hardware/gauge with software that would talk to the wideband sensor.
anybody had good results with this? Also it would be nice if the software was open source...
TIA
Why go through the trouble of getting a carb and a laptop to talk to each other when you could just mega squirt it?
Most basic route you'll have is a JAW diy wideband controller + sensor. Or an LC-1.
You need something to control sensor warmup and translate the signal.
If you have the laptop, get this data acqusition kit for $25 USD:
If your laptop doesn't have an RS-232 port, they have a USB kit for $50 USD
The software works like a 4 channel recording oscilloscope, but each channel is a sensor input. The data capture file can be as big as your free disk space, and you can play it back, slow it down, stop on trigger conditions, etc.
NFI, I've just used it and like it.
Carter
Rza wrote:Why go through the trouble of getting a carb and a laptop to talk to each other when you could just mega squirt it?
Because mega squirting is at least an order of magnitude more difficult than simply reading the output from one gauge?
Sorry, can't help with the DIY stuff. If I need a wideband in a carb'd car, I just use a standalone display. Without other parameters like RPM (at the very least), I'm not sure what advantage the laptop would give you.
erohslc wrote:If you have the laptop, get this data acqusition kit for $25 USD:
If your laptop doesn't have an RS-232 port, they have a USB kit for $50 USD
The software works like a 4 channel recording oscilloscope, but each channel is a sensor input. The data capture file can be as big as your free disk space, and you can play it back, slow it down, stop on trigger conditions, etc.
NFI, I've just used it and like it.
Carter
You like the software and whatnot? I'm trying to put together a basic system similar to the OP, but for a mechanical EFI system. I've seen that one a lot, but just wasn't 100% with the software. For the price, it is tough to beat, though.
Looks like I may need to learn to program in Windows Mobile... I'd love to port that into a PDA instead of a laptop.
Eric
In reply to granth:
Why reinvent the wheel? Unless you want to, which is fine.
http://www.zeitronix.com/Products/zt2/zt2.htm 279$.
The LC-1+ will do the job too for about the same price.
An LC1 with a used MS makes a good and cheap data aq package for a carbed car, I've done that a few times. Just feed it the wideband, tach signal from the coil, vacuum signal and any other sensor you might want to use (clt, iat, etc).
If you have the money for an LM2 it could be worth it if you use it to tune other people's cars, need to do adjustments at the track, datalog without a laptop, etc.
bradyzq wrote:In reply to granth:
Why reinvent the wheel? Unless you want to, which is fine.
http://www.zeitronix.com/Products/zt2/zt2.htm 279$.
The LC-1+ will do the job too for about the same price.
Yeah that is what I want to do, i agree no need to reinvent, just was hoping for an open source software and hardware solution that was off the shelf and not a special unit from company xyz....
I have a Zeitronix ZT2 + LCD Display. It is great.
I bought it used and it didn't work, when I emailed the company to ask if they had any ideas on what could be wrong, they had me ship the unit (which was 3 years old by then) and my O2 sensor. They repaired it for free, I was only out shipping.
Their customer service is excellent, to say the least.
