Member
Issue is that 1995 1996 M73 came with the DMEs with 1 time write chips... has anyone had any luck to remove oem chips and install flashable chips?
Member
Get in touch with firebird540. He's one of the authorities on 850Ci M73 tuning.
Member
Thank you will do.Originally Posted by revtor
BMW CCA Member
Hey Dragon. Please let us know if you have any luck with firebird, as I am also interested.
Desecrator of all things Sacred
Spitfire980
+1...im interested too! 95 M73
Has anybody spoken to DUDMD?
Last edited by spitfire980; 06-18-2018 at 05:40 AM.
"Understeer is when you hit the wall with the front of the car, Oversteer is when you hit the wall with the rear of the car, Horsepower is how fast you hit the wall, Torque is how far you take the wall with you."
BMW CCA Member
Yes. He doesn't offer programming for the M73.
Desecrator of all things Sacred
Member
Yeah he does? He owns one of the baddest 750iLs out there. He’s got videos of him tuning it on his website and offers tuning for M73 cars that you can buy right off the page.
Spitfire980
https://www.dudmd.net/products/750il...rformance-tune
https://www.bimmerforums.com/forum/s...-tune-rocks!!!
All of them are for the E38 though, dont know if he does the E31
"Understeer is when you hit the wall with the front of the car, Oversteer is when you hit the wall with the rear of the car, Horsepower is how fast you hit the wall, Torque is how far you take the wall with you."
Member
Lie I said guys, the tuning is for post 1997 M73, earlier versions have a one time write chip. That is the problem I am trying to solve.
Spitfire980
Seems you are right, I asked him on FB, here is his reply:
"Cannot tune the pre 97 at the moment. No hardware available to replace the current eprom"
If you do find anything, count me in
"Understeer is when you hit the wall with the front of the car, Oversteer is when you hit the wall with the rear of the car, Horsepower is how fast you hit the wall, Torque is how far you take the wall with you."
Member
How hard (or expensive) is it to run a pre-97 engine using a post-97 ECU with the modifications you want? I'm just wondering whether junking the entire computer and replacing it with another tunable one (or two or three, with the V12) gets you to your destination. Used units are all over eBay, assuming you can identify one with the reusable chips.
Cheers, John
Member
Not possible, different harness and ews 3.
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Can anyone open pre 1997 dme and send me the pic of the chip? I don't have the car here
BMW CCA Member
Since we are on the E31 forum, I assumed you would understand that we were talking about the E31 M73. My mistake.
Desecrator of all things Sacred
Spitfire980
What ever happened to this? any updates?
"Understeer is when you hit the wall with the front of the car, Oversteer is when you hit the wall with the rear of the car, Horsepower is how fast you hit the wall, Torque is how far you take the wall with you."
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Last I heard no
Mad Scientist
The update is... you cannot do much at all to M73 powered E31's.
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In a bit more detail, as far as I know Firebird is the only person who has been able to do any type of mods to the DME. I don’t know of any third-party that has been able to replicate his work.
I have also heard whispers that there is at least one E31 M73 running a completely custom engine management system, But never seen any independent proof.
The only other engine modification is the ‘Dinan’ Intake manifold extruding/hone to supposedly improve flow and give HP…. Even though it’s very well established that the flow limiting /bottleneck of the M73 head is the exhaust valve / port design…not the intake side.
Last edited by Auraraptor; 01-21-2022 at 01:54 AM.
Member
Any ideas on how to upgrade or program the E31-M73 AT-EGS?
I believe "Firebird540" did the DME and EGS upgrades whey back when, however he lives in Germany and only did the upgrades in person when he came to Las Vegas.
Post:
http://forums.bimmerforums.com/forum...3#post25913483
I think BMW extracted just about all the torque/HP out of these 2-valve engines, however a 3.23:1LSD does wonders for rear wheel torque with only a minor RPM increase.
Personally, I would like a transmission "Sport Mode" M/S-Gate gear selection program update for the E31-M73.
1) M/S-Gate selection for 1st gear.
2) M/S-Gate Sport mode that uses 1st - 4th only.
E38-M73 and E31-M62 has the M/S-Gate but the E31-M73 only has an M-Gate.
The AT-EGS control units are all "GS: 9.22.1" with the E31-M73 "Code: NW" and the E38-M73 has a "Code OF"
Unfortunately, that I'm aware the EGS is not programmable in the car. I swapped an E38-M73 EGS into my E31 and it causes a Trans Program Fault.
I anticipate the hand-shake fails!!
Current E31-M73 transmission program cannot manually select 1st gear.
No Sport Mode selection with M/S-Gate; so the transmission normally shifts 2nd - 5th gear (aggressive throttle position at start-off will induce a head snapping 1st gear down shift at start off)
Last edited by m6bigdog; 01-21-2022 at 04:33 AM.
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