DRM custom FX3 controller. Anyone remember these?

[scorp508]

I have a DRM custom FX3 controller on the way from JG95ZR1 with the AA208-1 chip to go along with my car's DRM coil-over setup. I'll likely leave the factory controller in other than for Autocross/Drag days.

These things seem a bit lost to the bowels of internet history, and I could not find much detail on them other than one mode is "full stiff" and the other two modes will let you dial in more/less over/understeer. DRM appears to have offered various chips, but the differences between them I can't quite discern other than some references to possibly road course, drag strip, and autocross options.

Does anyone have older DRM parts catalogs that may offer some hints? I'd love to track down the other chips if they're still out there, or burn them if I someone has the raw ROMs.

I reached out to drm@dougrippie.com to see if they have any archival information or dusty old chips to sell. :cheers:

A few threads with bits and pieces of info.

https://www.zr1.net/forum/showthread.php?t=20057

https://www.corvetteforum.com/forums/autocrossing-and-roadracing/2366351-road-race-modified-fx3-controller.html

https://www.corvetteforum.com/forums/c4-tech-performance/3112317-dsoes-anyone-remember-the-settings-on-the-drm-fx3-controller.html

[AlbanyBrian]

Here is what the most recent DRM catalog I have says about there FX3 controller and PROM?s
https://www.zr1.net/forum/picture.php?albumid=539&pictureid=5404
Brian

[scorp508]

Here? what the most recent DRM catalog I have says about there FX3 controller and PROM?s

Very cool. Thanks Brian!

Thanks to ChumpVette I also now have this info on a couple different chips.

-1991 / 1992+

A208/AA208 (Matches your image above.)

Tour: Stock sport setting
Sport: Full stiff rear, 80% stiff front
Perf: Full stiff front & rear


A217/AA217

Tour: Stock
Sport: Stock
Perf: Full soft front, full stiff rear up to 25mph. >25 MPH full stiff front & rear. (Thanks Graham for the info.)

[grahambehan]

A217 and AA217 go to full stiff front and rear above 25 mph in perf mode.
Graham

[scorp508]

Thank you, Graham. Are you aware of any others, like maybe one with stiff front and soft rear for weight transfer for drag racing?

Randy Rippie responded to me and they don?t have any archival info or dusty parts still around. Oh well.

[grahambehan]

Yes, somewhere, I will try to find it.


Graham

[phrogs]

I have one of their modified controllers not sure if it works anymore.

[grahambehan]

Here is what I have
A218 AA218
tour stock
sport full soft front and rear up to 25 mph; full stiff front and rear above 25 mph
perf full soft front, full stiff rear up to 25 mph; full stiff front and rear above 25 mph
A219 AA219
tour stock
sport full stiff front and rear
perf full soft front, full stiff rear up to 25 mph; full stiff front and rear above 25 mph
A230 AA230 slalom 1
tour stock
sport full stiff rear/80% stiff front
perf full stiff front and rear
A233 AA233 road race
tour stock perf. with rear 80% of front (front stiffer)
sport stock perf.
perf stock perf. with front 80% of rear (rear stiffer)
A300 AA300
tour full soft front and rear up to 75 mph; then full stiff front and rear until go back to 20 mph
sport stock performance
perf full stiff front and rear
A301 AA301
tour full soft front, 50% stiff rear up to 75 mph; full stiff front and rear above 75 mph and back down to 20 mph
sport stock performance
perf. full stiff front and rear
A302 AA302
tour stock
sport front full soft/rear 50% stiff
perf front full soft/rear full soft
A303 AA303 Drag Race
tour stock
sport full soft front and rear until 60 mph; then full firm front and rear
perf rear full firm; front full soft to 60 mph then full firm

[DaveK]

Never heard of these before. Shame they're no longer available. The A218 AA218 Graham mentions sounds like a nice upgrade.

[scorp508]

I have one of their modified controllers not sure if it works anymore.

Feel like opening it up to see which chip is in it? :)

[scorp508]

Here is what I have

Holy moly, Graham! Thanks for digging that out. :cheers: Now I want to find a few, see if I can pull the code off, and compare the differences.

[tpr60]

I have one I bought many years ago, note on it says Road Atlanta race track. Never used it.

[scorp508]

I have one I bought many years ago, note on it says Road Atlanta race track. Never used it.


tpr60, i think you and phrogs should open them up and see what it says on the chip. For science!

The lid pops off relatively easy with small tabs around the perimeter, then two screws next to the connector. Once the screws are out, then pull the two larger black screw tabs away from the plastic body slightly while the main board facing down. The board will fall out enough where you can then remove it.

I love the old Compuserve address.
20823

20824

20825

[rkreigh]

still have drm fx3 and set for full soft and hard rwar

good enough for 11.27 on drag radials

switched to coil overs so I don't use it

[dredgeguy]

still have drm fx3 and set for full soft and hard rwar

good enough for 11.27 on drag radials

switched to coil overs so I don't use it
Ron, sent you a PM

[phrogs]

Feel like opening it up to see which chip is in it? :)

I will need to find it first haha when I do Ill post some photos.

[tpr60]

Just dug up the modified shock controler, it has a Bilstein sticker on the outside AK2100, inside chip has a pice of tape with code BB206A written in pen. Masking tape on the outside says "used Road Atlanta '94 performance modified by Bilstein". Also have the shocks that came with the contriller.