Additional Injectors Done (Turbo)

After going the FMU route, I decided to try somthing with a much wider tuning parameter. I've had a full stand-alone on a Miata before and the results were phenominal.

I was familiar with several AIC's, including the Split Second one I ended up going with. Found it on Ebay for $125 so I couldn't resist.

The injectors are two Accel 30lb (high impedance) units. The Injector bosses (mild steel base) were difficult to find because most people use aluminum ones. Finally found some out of Canada.

The unit itself receives a vacume/boost input, as well as one from the tach reading. The software goes .5 psi at a time, and in 500 rpm increments. Together they form a grid with cells that allow you to fully program the fuel delivery a cell at a time. It also has an auto fill option to get a base map started.

I took it out this morning for a shakedown and it is simply amazing. I really need to do some dyno work with a wideband to get it just right, because the tuning options are endless. You can watch rpm, pressure, injector duty cycle, (and other parameters), in real time while driving via/laptop.

Hard to explain everything in one post, but I'm open to questions.

Box

I forgot to include the fact that this unit eliminates the FMU, as you are able to run this setup with stock fuel pressure.

Laptop

Here is the parameter screen, (real time).

Went and did some tuning this morning (on the street) and worked a few bugs out. The a/f ratio was initially going lean at the onset of boost and then getting way too rich under full boost. This was with a linear map, (1 2 3 4 etc). I assume this was being caused by the transition from the closed loop to open loop operation of the factory ECU.

As you can see on the table below, extra fuel was needed at the onset of boost to correct the problem. Then you program a little less fuel when the open loop takes effect. It took a little fiddling with but this map provided pretty good results. Once I'm comfortable with the changes it may be time to pull even more fuel at higher boost. Still a tad too rich.

Very sweet setup! Since you mentioned a wideband I thought I'd pass along that I've been using an Innovate Motorsports wideband o2 meter/datalogger for my engine project and it is really useful for tuning. The Innovate can do datalogging of the o2 plus up to 5 0-5v sources. It can also log rpm via a clamp. You can take the truck out, hit record and drive for a while without having to watch the meter.

The only downside is that the unit is bulky so it doesn't make for a good permanent install. Some of the guys on the 80s forum have the new Autometer wideband o2 gauge as well and that seems to be working pretty well and would make for a better permanent install.

Bring that thing down to the Green Country Cruisers pizza get together this Thursday night. I would like to see that.

Moby said:

Very sweet setup! Since you mentioned a wideband I thought I'd pass along that I've been using an Innovate Motorsports wideband o2 meter/datalogger for my engine project and it is really useful for tuning. The Innovate can do datalogging of the o2 plus up to 5 0-5v sources. It can also log rpm via a clamp. You can take the truck out, hit record and drive for a while without having to watch the meter.

The only downside is that the unit is bulky so it doesn't make for a good permanent install. Some of the guys on the 80s forum have the new Autometer wideband o2 gauge as well and that seems to be working pretty well and would make for a better permanent install.

Click to expand...

Are you using the LM-1? If so, do you need the "auxbox" if you want to log manifold pressure as well.