I am on the verge of hooking up the DET3 to my Fiat Seicento with a cam so hot the stock ECU (IAW.16f) can't keep up. All cables are ready to be connected and though I've read the manual quite a few times, I still feel a few things are unclear to me.
This will be a 3-stage build, so bare with me.
TL;DR
1: Piggyback-installation on SPI setup - what are my options, what should be grounded, MAP-sensor woes.
Should both Power Out #1 and #2 be grounded? Power Ground as well?
Can I substitute the stock MAP sensor with the built-in MAP?
If not, how do I make a .def-file for the stock MAP-sensor? (graph below)
Can I just hook in to the positive wire from the stock O2 narrowband sensor to get a signal to e.g. Analogue #3
2: Converting to FIT-mode.
3: Going all-in on a turbo-setup.
Details:
Cursive/italic: Questions/doubts
The first step:
Get the DET3 up and running as a piggyback with my SPI setup (1x 1.75 Ohm 465cc injector) on an 1108cc engine with a 40mm throttle body, C&B 280/268 cam, skimmed and flowed head, Supersprint exhaust manifold with a 1.75" exhaust.
Analogue inputs:
#1 : TPS (pin 30 @ IAW)
#2 : Built-in MAP sensor
#3 : Connect to the positive wire from the car's NB O2 sensor at stock ECU
#4 : IAT
Is #3 an option?
If not I will hook it up to the coolant sensor.
Analogue output:
Pin 32 on IAW.16f (MAP signal)
If I understand the software correctly, I can skip the stock MAP-sensor completely and modify the signal based on the DET3 sensor, instead, simply by limiting min/max BAR in the .def-file to get the 0-5V range output.
Failing that I can easily re-route the stock MAP-sensor wire to Analogue in #4 and modify the signal through that.
I (think) am missing the .def-file for the stock MAP sensor and the only data I can find on it is the graph below.
- seicento_MAP_SENSOR_graph.jpg (6.44KiB)Viewed 2051 times
Should both Power Out #1 and #2 be grounded when not in FIT-mode?
The same goes for any unused Analogue Input?
Can I connect the Power Ground to ground without any issues?
The second step:
I will swap the cylinder head for an MPI model. I have one which needs restoring. At this point I will convert to FIT-mode, which is why I'm connecting TPS to Analogue Input #1 and IAT to #4 in the first stage.
I assume I can draw some good data for a basemap in the first stage as well.
I'm doing this to get more familiar with the FIT-mode before doing the final step - after all an N/A engine is less likely to blow up than a turbo one.
At this point I'll fit a wideband lambda, as well.
The final step:
A low compression, high-boost turbo-build. I'm still sourcing parts for this though not much is missing; a boost controller, hoses and a week off work.