Help with M's FBC

[SteveL]

Can anyone help me with a manual or any info on one of these ??

I got this one seconhand and the seller promised me the connection info, but...

Anyway, I've figured most of it out by bench testing, but there are a few things that I haven't (eg there's a green wire on one connector that goes no-where/ also there's a pot and a couple of switches on one side, probably for callibration (?)).

Any help appreciated. I've done a web search with no real luck.

TIA

[meggala]

never heard of them are they a boost controiller or something else?

[SteveL]

Originally posted by meggala

never heard of them are they a boost controiller or something else?

Yes, it's a fuzzy logic boost controller. It was cheap, and seems to work OK on the bench, but probably have to play around with it on the car to find out more it seems.

Alternatively, know anyone that can read Japanese ?? - there are some labels on the thing which might help explain matters - I can take some photo's and post them......

Cheers

[meggala]

yeah post the pics I'm sure there are a few who might know japanese.

[SteveL]

Here is a picture of the connector. The one at the left is the one I'm interested in - anyone able to help with that Japanese symbol ??

[SteveL]

Photo of what I think is the calibration pot - there are also 2 switches near by (see next 2 photos). Interested in what that Jap Text says. W and N also has something to do with one of teh switches

[SteveL]

Switch right next to pot in prev photo, also has W-N label, so clearly something to do with the pot.

[SteveL]

Another switch right next to the previous one.

[SteveL]

Final Pic - Main Label. Operating Volts, temps etc are pretty obvious, plus pressure ranges, but would be nice to have confirmation of the last few lines

[Claudio RX-7]

Hey, i have a friend who also bought one of these boost controlers, it appears to be a limited production model from Mines, if M's stands for mines, that is specifically designed for a specific shop.

I have not been able to find any information in the web about this product, have you found an installation manual or something that i could use as well?

Later,

______________

Claudio RX-7

Tuning Technology Unlimited - For RX-7's and the Performance Markets

www.tuningtechnology.com

[email protected]

[GTR-Ben]

I had about 4 of these boost controllers. Some were the FBC and some the older non fuzzy ones..

Would be nice to know how they work exactly.. never been able to find any info..

[Claudio RX-7]

Hello agian,

I did some preliminary testing on a stock SR20DET powered S13 Nissan 240SX. Installed it the following way:

5 Pin Connector:

Red - 12v battery

Black - Ground

White - Solenoid connector

Pink - Solenoid connector

Green - LED screen dimmer, to be hooked up to the light switch so the leds dont shine so much at night.

The hoses on the solenoid are a little tricky, since ive only worked by ear with this thing, just went on experience with other boost control solenoids:

Thin hose fitting goes to a vaccum sourse (the one used for the pressure regulator for example). The hose fittingin the middle and on the bottom of the unit i did 2 test with them switched around between the wastegate/actuator and one of them and the other to where the waste gate goes connected (a fitting on the plenum/intake manifold).

Here are the results:

First test, set what apears to be a low boost setting to ".00" apparently this setting didnt want to fix any values to memory for some odd reason, and the high boost setting to ".60" bars. When you press the "power" button on the unit i have here, there is a LED light that turns on or off, apparently this is how this unit switches between low boost and high boost, the unit doesnt have an off button.

If i run the unit with this LED on the boost reached was the factory WG level of 6psi. If i shut that LED off then aparently the unit will have the solenoid shut off or fully closed cause in second gear the car reached 1.2 bars, which was not what we set it to.

Second test i switched the main hoses around, and tried again turning the "power led" on and off, this way nothing happened and boost reached was 6psi.

Next test was switching back the main hoses back to how they where first, and move the dip switch in the back of the unit that says P and S and also, nothing happend from doing this.

Will test more later and post the resuts here. If anybody knows anybody that can get these manuals please, post here. Thanks

Later,

[SteveL]

I've 'sort of' figured out most of it from just playing around. It's fitted to my car and 'seems' to be working OK, but 'fuzzy' logic devices can 'learn' your engine characteristics (probably fairly crude), so they need some running time to adapt to your engine, and I haven't had the time to do much more with it.

What I can tell you is this:

- the unit needs to be connected to a constant 12V source (ie direct to the battery, NOT switched on/off via ign switch). The controller senses engine running or not via it's inbuilt MAP sensor, so switchs itself on/off accordingly. Otherwise you loose your settings each time.

- The 'WN' switch on the side of the unit sets 'wide' and 'narrow' boost control ranges, and the pot near it (white knob) is a further 'fine tuning' control within each range. This is NOT the boost control range of the unit itself (eg 0.5-1.5 bar) but the characteristic response of the controller at the set boost level. For example, setting a narrow control range will force the controller to give a 'hard' cut at the set level, but a wider range will allow some over-shoot and give a 'softer' transition for the waste gate. I suspect this setting is to provide for different types of wastegates/turbo/engine/driver characteristics.

.

- the PS switch seems to allow a 'normal' and 'inverse' operation of the wastegate solenoid. In one direction (can't remember), the controller operates the solenoid 'closed', while in the other it operates it 'open'. Again, this just seems to be to allow for different types of wastegate/turbo, etc.

The LED on the display you mention is simply an on/off indicator for the controller, ie when 'on' the LED indicates that boost control is in operation, when 'off', no control is in effect other than via the factory wastegate. I can hear the solenoid on my controller 'clicking' when I turn the unit on/off that way. Of course, how the solenoid is connected to the wastegate, and the position of the PS switch, is critical to correct operation of the controller

Thanks for the info on the green wire, that was one that had me puzzled. The '00' setting is the other one that has me beat....can't seem to change it and not sure what it's for. Other than that, my unit seems to work, but I haven't been able to acheive consistant boost control results with it. That may be due to the need for the sytem to 'learn' more, but anyway.

As to the 'mines thing, might well be, but no one has been able to get me a manual. Someone on another list was kind enough to translate the Japanese writing based on the pictures I posted. Wasn't a huge help, but better than nothing.

[Claudio RX-7]

As to the 'mines thing, might well be, but no one has been able to get me a manual. Someone on another list was kind enough to translate the Japanese writing based on the pictures I posted. Wasn't a huge help, but better than nothing.

Thanks SteveL for that additional bit of information, i guess we will have to keep tweaking it, also, can you scan what the translation of the lable says and post it, or write it on here? i can figure out a little of it, but not a whole much, also, what really has me puzzeled is the 2 dip switches, you already cleared one up, but the other one has me scratching my head.

What really had me worried was the fact that the boost controller, when i turned the led off with the power button, spiked boost to 1.2 bars in 2ng gear, meaning it had the wastegate closed, i guess it was from having the hoses reversed, but i dont know.

Let me know what you can,

[Claudio RX-7]

Any more info on this boost controller?

Later,