SMTCapeCod

Doing a little cross-pollinization here.

I have a lusty 83 Euro S, and a stalwart 3000GT VR4- which to both my pride and chagrin moves me through the twisties and down the straights much more quickly than the Euro.

Anyway, in the VR4 world, piggyback computers are part of the baseline performance modifications. I've been out-of-the-loop and relying on the 928 Listserv for most of my information, but my recollection is that most of the 928 folks were either relying on AFPR or a whole standalone like Dastek or Unichip for tuning control. The former being a little crude and the latter being very costsly. My interest was piqued when I saw that the fuel controller I chose (called a Pro-M, common for Mustangs) was also listed as workign on 944/924S.

So, given all the forced induction activity and discussion I'm seeing here...
This is a link for a product that is coming out from a well-regarded supplier for the Mitsu (and turbo buick) parts. Thought I would post here in case there is any interest.

Fuel Controller

When I inquired with the manufacturer about use on Bosch systems/928, this is the response that I got:
It should work on a 928, the unit is configurable for analog (voltage) sensor output as well as frequency. We would just need a sample sensor or some sensor data and the option can be put in the unit. -Bob

I have no affiliation with the company and no financial interest. I'll be interested to see whether anyone follows up and whether its worthwhile.

mspiegle

Geez, that thing is expensive....

some of us here who have modified cars run an SMT6 piggyback. It is amazingly good with fuel modifications AND it does ignition (though not perfectly).

SMTCapeCod

Sounds interesting. I've never heard of it-- I'll have to go off searching....maybe I'll need to bring info from here to there, after all!

SMTCapeCod

OK, perfect Power, I've come across them before. They actually have a wiring diagram set up for my Mitsu. I'm not tech-savvy enough to understand the benefits and drawbacks of the two units.

What is the price range for the SMT6?

mspiegle

It depends.... i've seen them anywhere between 250 and 400+

I used one on my SC'd 928S with good results. I had control over ignition too... but as I said it gets a little strange sometimes.



Here is me screwing around trying to tune my AFR for 11.5. I made 3 runs and corrected the MAF voltages at certain points to achieve a pretty decent AFR.

SMTCapeCod

Interesting. My Pro-M is fairly solid but does get quirky occasionally. And a minor quirk in AFR or timing makes a big difference, particularly with forced induction as you know. Most guys are going with Greddy Emanage or AEM EMS standalone, with a few ponying up for Unichip. Those are all about $1K +/- and also providing timing control- mine is just fuel. So maybe PP will be a good lead for the VR4 crew.

I'm just trying to share a little info between the platforms, maybe find out if there is anything helpful to one or the other, whether the different 'camps' are mainly due to perception and custom or atual application of the products.

Note that one of the interesting features of the MAFT-Pro (described in the 'info' section of the site) is that it can be set to use a wideband 02 sensor to provide continuous correction of fuel delivery under WOT. My motronic days were too long ago for me to remember whether or not the Bosch units provide adjustment under WOT. The Mitsu ECU dumps the O2 signals under WOT and uses a predefined map (which is where the value of most of the fuel controllers lie).

So in theory, you could tell it to maintain 11.5 at WOT and it would self adjust to varying conditions based on WB O2 inputs.

Mongo

I'm curious if anyone has thought about utilizing a MAP kit with the forced induction projects going on over here. That may help balance any uneven air and fuel ratios. It does have its ups and downs though; 1 being that MAFs are easier to calibrate and tune.

Louie928

The SMT-6 has an input for MAP as well as the MAF. You can optimize timing and fuel without boost, then either retard timing and/or add fuel according to the MAP output separately from the normal timing & fuel maps. There are also two separate maps so you can have each set up for different grade of fuel or for any other set of conditions. The maps are switchable as the engine is running.

Mongo

wow! quite the handy little system! I always thought you'd have to turn the engine to make your adjustments. That is pretty damn cool!