280Z28

Here's where I am right now on the core

I'm not getting the encoder guys

The NI FPGA card I'm getting has 8 16bit analog inputs that can be accessed directly from code. For inputs that I don't need sitting on the 40MHz clock I have 32 more 16 bit inputs on my M series card. I'm setting up the FPGA to run the "bare minimum" required to run the motor. I'm communicating with it from a host computer to handle things like short term and long term fuel trims and the AI networks.

Don't get the LS7 heads. Did you see the price of the L92 heads I posted in the aluminum heads are light thread? Those things flow crazy numbers (320+ out of the box) and you can have them bolted on your motor for under a grand. I suppose if you already have the LQ4 then that's the easiest way. The LS2 does have a 4.0 bore though. LS7 heads will have nasty shrouding issues on a 4.0 bore, if they'll even work at all.

I decided to add an FPGA to the system to offload the interpolated timing (needed when you use a 28 tooth, or any "low resolution" wheel) on dedicated hardware instead of taking up clock cycles on my processor. I have another thread in the Megasquirt forum about it, since it seemed like the best place to put general aftermarket ECU threads. I am building my own system, yes.

LS1Tech for sale section. The guy said they were unused, and he really meant it. Everything was still sealed in the original packaging from GM, and shipped in the GM box without so much as a scratch in the cardboard.

And now I add spark to the engine.... Ignition coil driver.

A basic fuel injector that can work for a single injector (sequential injection), an MPFI injector bank (batch injection), or TBI. Just drop as many (or as few) as you need on the system VI and there you go. Edit: I know it has bugs but the basic sequence should work pretty easily.

Yep that's a definite advantage over the LS2 block

Man this is painfully expensive for something I don't even know will actually run Relays are easy to drive with special darlington transistors that have built in diodes to handle inductive back-current. I have a nice stable voltage supply in my test mule as well. Thankfully most of those issues you mentioned are well-covered online, as even the Megasquirt has to deal with them. In most ways, I'm even going to hook this up similar to the MS system, just hoping to provide a bit more powerful control over the system in the end.

It's not really the front. The center of the motor is like 12+ inches behind the front axle. With aluminum heads, I bet the car would be 100lbs heavier, but no worse off for weight distribution. Any particular reason you'd go with the LQ4 instead of an LS1/2 block?

Can we change the name from "Megasquirt" to "Megasquirt and aftermarket ECUs"?

Innovate LC-1 is a good product for cheap. If you have a laptop, you can have some pretty powerful (much better than you'll get from Innovate) datalogging abilities from the NI USB-6008. If you have a good datalogger, you can get away with having a wideband system without a gauge. You won't be able to see the data from it without the laptop connected, but seriously, how often are you actually using it? Once you have things set, you can just leave it until sometime later when you want to log it again.

They're relatively cheap and offer incredibly more accurate hardware event timings than processor based systems. It seems like they'd be very attractive for engine control systems. Anyone know why they aren't used more often? I'm going to be adding an FPGA to my hardware setup to offload the precision timing tasks from my main computer. It should greatly improve accuracy (25ns event timing resolution) and reliability (keeps running even if the host computer crashes). I'll also be able to focus the current system processors on the AI systems without losing clock cycles to the mundane tasks. I'm looking at the NI PCI-7833R to complement my current NI PCIe-6259. These are much more expensive than some other systems, but they allow me to focus on software tasks (AI systems, etc) during the development stages with very little time overhead required to have working hardware. Once my development is successful, I'll probably end up moving to a custom board based on the Xilinx Spartan-3L or similar to save money (combining the required features from my 2 NI boards into a single module optimized for the application). I really like certain features, like the fact that any of the 96 digital lines can be used for any sort of independent or synchronized precise timing output, including PWM on a 40MHz output clock. 25ns resolution means you can control individual injectors or ignition coils down to 1/500th of a degree of crank rotation at 12,000rpm. At this point I find I'm asking myself, "Am I dedicated, or am I just stupid?" I suppose only time whatever comes from my efforts will tell....

I'm going to have to add an FPGA to take care of things; then I won't need that sensor plus I'll have a much more powerful system overall.

Crank position for the ECU.

It would need a minimum of 1000 teeth lol.

I need to get one of these: http://www.beiduncan.com/pdf/ex20.pdf (sorry only have PDF ) Onto the belt-drive of a motor. I'm using a small block Chevy now, and an LSx later, but conceptually this doesn't matter too much. You think modifying the idler pulley to drive this would be the best way to at least attempt this? :dunno:

I just downloaded and watched that video. My initial impressions are "annoying" and "retarded." Just not my cup of tea I guess.

I can't find "Group Memberships" in User CP.

Why are they re-negotiating things after they ran??

Updates time Juan had his surgery and is doing fine. He has to do chemo once a month for 3-4 months. He'll be living in San Antonio still and travelling to Houston for the chemo. Now I get to see a Dr. today for a nasty cough I've had for a week.