TPC SuperCharger

[pk2]

Originally Posted by Gilles

How hard would be to adapt a Mega Squirt to properly work with a FI P engine?
Can you find the base maps to get you started..?

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I can't imagine any problem with it. The last time i looked at it though, I thought it had kind of a crappy interface. I picked up a thing called SMT6, a little outdated but it's plenty powerful. O.K interface to. Plan to swap it in soon. All the thing has to do is read 2 or 3 (however many you want) 0-5v signals with some accuracy and spit out at least one 0-5.0v signal (more if you want). It doesn't matter really what it's all blowing into.

As far as the mapping, I'm going to data log with the little box that came with the sc and use it as a starting point to set up the smt6 (gode me into doing it and I'll share). I think the SMT6 will drive 6 injectors but I'm not going to bother now. Conceptually it's not a huge trick to tune from scratch though, get EGT and wideband O2 sensors, should be good to go.

The earlly TPC boxes were crude, semi analogue (at best). Pretty hard to not beat.

Regards, PK

[tranceatlantic]

I got an SMT6 from Virginia Speed new for $225. It did not come with a USB or serial cable so Ive got to get one off those to allow program changes.

Next step: Get an EGT, air/fuel gauge (not read anything about these yet but I get the theory) and the wide band O2.

One thing Im not sure about: does the wide band o2 replace and existing sensor and feed its output to both the ECU and the piggy back computer? Or does have to be mounted in a separate location? If so where?

Does anyone have any recommendations for these sensors?

The plan is to install all these and get baselines. Id be happy to share my results.

[pk2]

Originally Posted by tranceatlantic

I got an SMT6 from Virginia Speed new for $225. It did not come with a USB or serial cable so Ive got to get one off those to allow program changes.

Next step: Get an EGT, air/fuel gauge (not read anything about these yet but I get the theory) and the wide band O2.

One thing Im not sure about: does the wide band o2 replace and existing sensor and feed its output to both the ECU and the piggy back computer? Or does have to be mounted in a separate location? If so where?

Does anyone have any recommendations for these sensors?

The plan is to install all these and get baselines. Id be happy to share my results.

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Yes, do share your results, be good for a lot of people I'm sure.

Usually the A/F gauge comes with an O2 sensor.

You can weld in a separate stainless steel bung (from ebay) or, replace an existing NB (narrow band) sensor with the WB (wide band) sensor. There are pros and cons to each method. The O2 gauge/sensor setup will fake a NB signal to the ECU. So ya, it replaces it.

E bays a good source for egt sensors. There are a couple different (types...E,J,K) or something). Every little Cessna has at least one. The simplest is just like a hose clamp with the probe/sensor stabbing in towards the center. Really easy to put in. There's another kind that's like a washer that slips over the business end of a spark plug. Again, there's pros and cons.

An airplane gauge is good, very high quality, inspected by the FAA every few years etc, etc. Ugly though. You can also just get an adapter that boosts the sensors output (tiny, mill-ivolts) up to a 0 - 5v signal/output. Then, there's Lots of ways to make that usable, (a DMM (volt meter will work)). Lot's of typical of the shelf gauges at a box auto parts use a 0-5v signal. You just need to match the readings from the gauge with known temp values (I.E. at idle, you read say 3.2 on your gauge, that might equal 600c, flat out you read 4.2, might =700c)

Regards, PK

[tranceatlantic]

I'm hoping to install the Perfect Power SMT6 within the next few weeks. Maybe this Sunday if Im lucky. I should be able to wire it up in a similar way to the diagram below and then monitor the pulses sent to the injector (which is not installed).



I will soon have a wide-band O2 sensor (for the option lambda input) thanks to pk2. According to by Bentley book, pin 44 of the 5.2.2 88-pin ECU connector is the throttle position sensor so that should be easy enough. Then there is the RPM input which I think should be ECU pin 80. Im not sure about the correct wiring for the other inputs though. Does anyone know what should be connected to the AMP input? I think its manifold pressure. Is there a wire from the ECU to the mass-airflow sensor that should be used? Maybe ECU pin 47? Or is it going to be from the output of my digital boost gauge (not installed yet)?

Perfect Power sent me a diagram but Im pretty sure its incorrect as it refers to a 55-pin connector and the book says a '99 Boxster uses DME 5.2.2 which is 88-pins.