How the recorder telltale works - BMW M3 (E46 M3) Message Board & Forum

Guys,

With all these engines blowing up, I think you need to know HOW
the revlimit telltale works.. three main things are recorded

1) Max Vehicle Speed in km/h

2) Max Engine RPM in rpms

3) Max TIME the engine has spent OVER 7800 RPMS

It seems as if the TNMAX variable is being misrepresented by
a few people out there as the time in seconds that the engine
was at the absolute max RPMS.. and that is BS!

Please pass this around to the brothers who are having problems.

Oh, and if anyone tries to argue this, here's the SOURCE CODE

seg000:00019C5A move.w (N_IST).l,d0
seg000:00019C60 cmp.w ($49D2A).l,d0
seg000:00019C66 bls.s loc_0_19C86
seg000:00019C68 move.b (ENGINE_STATUS).l,d0
seg000:00019C6E andi.b #$1C,d0
seg000:00019C72 beq.s loc_0_19C86
seg000:00019C74 moveq #$64,d0 ; 'd'
seg000:00019C76 add.l d0,(T_NMAX).l

At $49D2A is $1E78 which is 7800 rpms

(at least in software 7832874)

Oh, and for the record while I'll bet some of the people with blown
motors have indeed overreved, I'm also betting ALL of them haven't.

Something doesn't smell right to me

How the recorder telltale works - Jim Conforti 2002-04-27 17:00:35 (3887 views) (13741 thread views)
- wonderful info - much thanks - StoneWalk 2002-04-27 22:37:03 (354 views)
  - Yes, but if true, doesn't this contradict a post - surfah 2002-04-27 22:44:22 (316 views)
    - I believe that was at-or-below 7800 - StoneWalk 2002-04-27 22:49:50 (250 views)
      Code logs *AT* 7800 RPM or higher. - Dan 2002-04-27 22:54:19 (329 views)
      Okay..so I wonder if we should shift at 7800 rpms - surfah 2002-04-27 22:53:13 (258 views)
      hello "sustained" running above 7800 rpm - StoneWalk 2002-04-27 23:02:32 (343 views)
      But how much is okay? Only BMW knows. - Dan 2002-04-27 23:08:59 (254 views)
      I give up - go buy a Lexus - StoneWalk 2002-04-27 23:26:00 (281 views)
      Oh, and something else you fabricated... - Dan 2002-04-28 00:07:10 (275 views)
      Take it easy, argue objectively. - Dan 2002-04-27 23:50:48 (190 views)
      Hey Stonewalk, relax, most of us love our M3s here - surfah 2002-04-27 23:46:07 (192 views)
      why the limiter is at 8000 - StoneWalk 2002-04-28 00:08:15 (299 views)
      Nice fabricated percentages and assumptions - Sean 2002-04-28 05:48:29 (185 views)
      Hey Stonewalk, we are all on the same side - surfah 2002-04-28 00:22:42 (142 views)
      one peak reading, one sustained one. - StoneWalk 2002-04-28 01:06:10 (162 views)
      I'm not confused. Only curious - surfah 2002-04-28 01:25:43 (139 views)
      Where do you get "hours". You're full of it! - Dan 2002-04-28 01:11:04 (138 views)
      sigh - StoneWalk 2002-04-28 01:50:05 (119 views)
      Okay...forget about these trivial arguments, what - surfah 2002-04-28 02:05:54 (104 views)
      Re: sigh - Dan 2002-04-28 01:57:40 (111 views)
      then why did you take it literally? - StoneWalk 2002-04-28 02:04:33 (116 views)
      Because you represent your opinions as facts... - Dan 2002-04-28 02:28:36 (135 views)
      Yes, why monitor 7800 and not 8000. Odd, no? (nt) - Dan 2002-04-28 00:24:28 (124 views)
      exactly. Take that stonewalk. (nt) - will 2002-04-28 00:05:46 (104 views)
- Explanation of Jim's (BMW's) source code - Dan 2002-04-27 19:14:29 (431 views)
  - Dan, great job ! I bet u got an A in machine lang - surfah 2002-04-27 22:41:14 (172 views)
    - Only Jim (and BMW) knows what $49D2A contains - Dan 2002-04-27 22:52:27 (191 views)
    - Never mind. Jim explained in post below (nt) - surfah 2002-04-27 22:50:42 (131 views)
  - man! - this brings back some good memories :-) (nt) - William ©⁸⁵ 2002-04-27 19:54:50 (94 views)
    - For me too. I LOVE(D) writing Assembler code. (nt) - Dan 2002-04-27 19:57:17 (123 views)
      So did I (nt) - Stl Don 2002-04-27 20:16:04 (84 views)
  - awesome write up!! I hated assem classes :) (nt) - Des 2002-04-27 19:46:40 (111 views)
- Hey Jim, what about the rev limit actuation? - will 2002-04-27 18:18:29 (140 views)
  - Re: Hey Jim, what about the rev limit actuation? - Jim Conforti 2002-04-27 22:29:28 (314 views)
- When can the class action start? (nt) - will 2002-04-27 18:10:34 (121 views)
- Use this to validate all the "BMW said" crap... - Dan 2002-04-27 17:57:26 (114 views)
- I got my SMG up to 8500rpm's yesterday... - Aman 2002-04-27 17:47:56 (3138 views)
  - Re: I got my SMG up to 8500rpm's yesterday... - Craig ///M3 2002-04-27 17:52:51 (244 views)
    - Ask them to give me a loaner car...hehe ;-) (nt) - Aman 2002-04-27 17:54:32 (128 views)
- Sorry for the dumb question but what language - surfah 2002-04-27 17:38:00 (167 views)
  - Re: Sorry for the dumb question but what language - Jim Conforti 2002-04-27 22:24:45 (300 views)
    - Ok...thanks. That was excellent info Jim ! - surfah 2002-04-27 22:48:13 (127 views)
  - Machine language. Don't know processor. - Dan 2002-04-27 17:47:48 (153 views)
    - A crack at pseudo-code for this - Dan 2002-04-27 18:45:10 (173 views)
    - Siemens 80C166 if I recall correctly (nt) - Hellrot 2002-04-27 18:22:41 (152 views)
    - Thanks for clearing that up Dan ! Makes sense now. (nt) - surfah 2002-04-27 18:03:53 (80 views)
    - Ah, fig some assem lang, just looked very strange (nt) - Thanks :) Des 2002-04-27 17:50:06 (84 views)
  - Me too :) didn't want to ask (nt) - Des 2002-04-27 17:39:56 (85 views)
- once again, JimC comes thru for the people!! (nt) - RichP 2002-04-27 17:36:48 (87 views)
- Great info! How on earth did you get the source?!? (nt) - Des 2002-04-27 17:20:42 (109 views)
  - Re: Great info! How on earth did you get the source?!? - Jim Conforti 2002-04-27 17:27:05 (283 views)
    - hehe, oh, I didn't realize you worked on M3s... - Des 2002-04-27 17:34:17 (137 views)
- Can you tell us again how the SMG cars over-rev? (nt) - William ©⁸⁵ 2002-04-27 17:11:59 (85 views)
- Time spent over 7800 rpm??? - Craig ///M3 2002-04-27 17:11:42 (161 views)
  - Re: Time spent over 7800 rpm??? - Jim Conforti 2002-04-27 17:28:29 (257 views)
    - Jim, what performance +ups will the Shark injector - CJ 2002-04-27 18:33:51 (290 views)
      Re: Jim, what performance +ups will the Shark injector - Jim Conforti 2002-04-27 22:43:47 (460 views)
    - Re: Time spent over 7800 rpm??? - CJ 2002-04-27 18:25:36 (92 views)
    - I am going to the dealer tomorrow... - Craig ///M3 2002-04-27 17:35:14 (113 views)
  - BMW considers 7800 to be the - atyclb 2002-04-27 17:15:07 (228 views)
    - So it is kind of crazy to quote the - William ©⁸⁵ 2002-04-27 17:18:47 (161 views)
      you got that right (nt) - shep01 2002-04-27 18:37:25 (100 views)
      No, it's not... (pic) - Jon 2002-04-27 18:33:05 (241 views)
      Typo: "they couldN'T track it back then" (nt) - Jon 2002-04-27 18:38:04 (97 views)
      Not crazy to me; distinction understandable - eatapc 2002-04-27 17:34:32 (93 views)
      The problem is the sense of - William ©⁸⁵ 2002-04-27 17:40:07 (120 views)
      Certainly there is a confusion created by BMW - eatapc 2002-04-27 18:19:25 (110 views)
      good points from the manual - atyclb 2002-04-27 18:22:37 (126 views)
      According to JimC... - Craig ///M3 2002-04-27 18:46:44 (135 views)
      no, it's that the last yellow light - atyclb 2002-04-27 19:03:39 (112 views)
      Yeah, I don't know how they could deny a warranty - atyclb 2002-04-27 17:26:46 (127 views)