Ken, Does your car have the motor of a 525? The rules for motor swap cars say the ECU should match the motor. If that is what was done than it sounds like everything is cool.
Dyno Runs At VIR
screwynewy
#62
Gasman wrote:
I don’t know if you mean an engine out of a 525, as in 5 series car or the stock engine that came in my car with a "x xxx xxx 525" ECU.
Either way, I agree with Carter’s earlier statement in this thread regarding ECU swapping…
[b]If someone has an ECU that has an electronic top speed limiter, and he swaps it with a stock/unmodified in any way ECU that doesn’t have that limiter, he will never be DQ’d by an official.
Carter [/b]
I can assure you that if I discover my car has an ECU with a top speed limiter it will be replaced with a genuine BMW, stock, unmodified ECU that does not have an electonic speed limit programmed in it. I would expect anyone else to do the same.
nasaregistrar
#63
screwynewy wrote:
[quote]Gasman wrote:
I don’t know if you mean an engine out of a 525, as in 5 series car or the stock engine that came in my car with a "x xxx xxx 525" ECU.
Either way, I agree with Carter’s earlier statement in this thread regarding ECU swapping…
[b]If someone has an ECU that has an electronic top speed limiter, and he swaps it with a stock/unmodified in any way ECU that doesn’t have that limiter, he will never be DQ’d by an official.
Carter [/b]
I can assure you that if I discover my car has an ECU with a top speed limiter it will be replaced with a genuine BMW, stock, unmodified ECU that does not have an electonic speed limit programmed in it. I would expect anyone else to do the same.[/quote]I meant the P/N was "x xxx xxx 525"
The earlier cars (live my 87 vert had "x xxx xxx 153" and my 89 had a "x xxx xxx 173"
Below is the list of possibilities:
325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 153
Bosch Motronic M1.1
325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 173
Bosch Motronic M1.3
325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 351
Bosch Motronic M1.3
325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 380
Bosch Motronic M1.3
325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 382
Bosch Motronic M1.3
325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 524
Bosch Motronic M1.3
325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 525
Bosch Motronic M1.3
325i/is/iX
E30
M20/B25 (170hp)
87-91
0 261 200 526
Bosch Motronic M1.3
Igor
#64
you can also find DME info on e30 specs page under DME. For E30 s , 325i variants, ECU 153 has Motronic M1.1 and rest have M1.3
FARTBREF
#65
There are a lot of possibilities on ECU part #'s. Supersession, Factory rebuilt dealer supplied, etc. You would have to have the Bosch part # reference book for every year since 1987 to have all the #'s. So if anyone base’s a protest just on the part # on an ECU, good luck.
Al
screwynewy
#66
I checked the ECU currently in my car and it is a 173. I was hoping to be able to use the speed limiter as an excuse for my slow top speed. I guess I just need less brakes and more throttle.
jblack
#67
Like Al said, all the "older" part number ECUs are superceeded. If your ECU died this AM, and you went to the dealer with your dead 153 and ordered that part, you would get a 264 unit (for 647 bucks, I might add)!
The 264 unit is desribed as a remanufactured item. I’d bet if you really ordered one, it would have an older part number, like a 173 underneath it. I’ve seen that on other parts.
Maybe we should clarify the rules to say that if a part is superceeded by another, the new part is a legal replacement.
I can’t think of a place that it would cause trouble in the rules - I don’t think this would affect the bumper updating/back dating issue - the chrome older bumpers are NOT superceeded by the plastic bumpers, they each have their own path. The ECU is not the same thing.
My 89 came (to me) with a 173, so I don’t think I have a horse in this game.
Teufelauto
#68
Ex36 wrote:
[quote]I know speedos can be wrong, but I’ve seen an indicated 127 mph on the back stretch at VIR. I’m far from fast, so I imagine others are seeing the same or higher.
Sasha[/quote]
With The smaller diameter compared to stock of the 205/50/15 I indicate 10% over the true ground speed on my GPS. That would mean 114 mph true.
screwynewy
#69
Teufelauto wrote:
[quote]Ex36 wrote:
[quote]I know speedos can be wrong, but I’ve seen an indicated 127 mph on the back stretch at VIR. I’m far from fast, so I imagine others are seeing the same or higher.
Sasha[/quote]
With The smaller diameter compared to stock of the 205/50/15 I indicate 10% over the true ground speed on my GPS. That would mean 114 mph true.[/quote]
Using this tire size calculator with stock tire size 195/65/14 compared to 205/50/15 the indicated speed would be 3.8% too fast. So 127 indicated would be closer to 122. This pretty consistant with my GPS data.
Carter
#70
on page 5 of this thread, I wrote…
"Michael:
I did write my post correctly…"
I should have written…
Michael:
I didn’t write my post correctly…"
Just corrected.
Carter
stevekappy
#71
Sorry I am late to the thread…
I am someone who has a '5xx ECU and it does affect times even if the straights are short.
I noticed the problem at Nationals last year on the back straight. I would hit the limiter about 2 seconds before the braking zone. I talked in the paddock and the general consensus was there was no top speed limiter.
At VIR early this year, I confirmed the top speed limiter on the front and back straight at VIR and David White who drove the qualifiers for the enduro (and the enduro) also hit the top speed limiter.
At Hyperfest this year, if (big if) I got a great run out of 10, I would hit the top speed limiter about 1 second before the braking zone in turn one.
I am definitely not a front runner, but I would expect that they would have more of an issue with the top speed limiter than I would and would probably bump it before I do.
I agree 100% with Carter… We have to be able to swap the ECUs or you are automatically making the cars with the 5xx ECUs non-competitive.
-Steve
nasaregistrar
#74
mskeen wrote:
Definitely Speed limiter…the earlier cars are limited to 136 MPH, the later ones 122 I think…there is also an independant rev limiter…
I wonder how the ‘speed’ for the limited is determined though. Theoretical speed based on gearing and rpm and tire size or the wheel speed sensors for the ABS? Anyone know?
nasaregistrar
#76
edavidson wrote:
[quote]Sean - wouldn’t that be the speed sensor in the differential?
Ed[/quote]I suppose…
MikeD
#77
This is interesting considering i’ve been racing with a 525 in the #29 car all season. I just thought the car was underpowered. I did notice that the car fell on it’s face at rockingham around the banking at ~120mph. We have a 173 so that’s what is going in the car now.
I wish I had known this sooner.
FARTBREF
#78
Been running a 524 in the now defunct black car…hmm, sounds like a good excuse for me getting dogged in the banking at the Rock…
Al
rsott
#79
If I’m looking at the correct part (under the dash on the driver’s side) on my 1988 325is the number on the ECU reads: 0 265 103 004. It doesn’t match anything on the previous list. Which ECU do I have and is it correct/legal? Am I even looking at the right part?
leggwork
#80
it is above the glove compartment on the psgr side - you were likely looking at the ABS computer.
cheers,
bruce
rsott59 wrote: