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Discussion Starter · #1 ·
I've let my engine optimized at a specialist, the power was increased of about 7%.
Of course it is very difficult to feel the difference. The engineer who did that said that it was not at all a problem for the engine's reliability.
But there are some bugs appearing when my dealer checks the electronic box (software) ; 3 minors which appeared only 2 times, but two "majors", one that appeared 18 times and the other 14 times. All that in something like 3000 kms. These identified bugs are weird, the dealer couldn't explain surely if it is a real problem or if it is due to the electronical modifications (so eventually bugs created) that the optimization caused.

I sent the details to the engineer that he can check what are the exact defaults. He said that if my dealer reload a new version of the software, all the optimization will be lost !!!

What should I do ? It seems it's not quite a professional optimization, when it can be deleted by my dealer !!
And if I'll have a technical problem with my engine, officially it'll not be anymore covered by the warranty, though my dealer said he'd never tell it to BMW (he'd better not to, if he wants me as a customer in the future...)

Any inputs would be appreciated. Are the 7% increase really worth all that "problems" ?
Apart from the software bugs, the engine is running very fine without any weird things.
 

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What is the nature of the "major" bugs?

7%?! that is quite a lot, did you dyno the car to confirm the claims?
 

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How did you get a 7% gain from reprogramming? That's...well..pretty much unheard of. That's close to 35hp gain, which you would DEFINETLY notice. I think your engine optimizer might be giving you a bit of a story here.

--Dan
 

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Funny, most optimizers I have spoke to said they will reprogram at no charge should the dealer have to reset the computer. This should play a major role in choosing any reprogrammer. Think you need to have some words with that programmer about what he has done. Something doesn't sound "right"!

Mark
 

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Discussion Starter · #5 ·
A 7% difference means less than 20 KW more power. You can feel it if you take a "normal" M5 and then immediately sit on the modified with 7% more.
Otherwise, you become almost immediately used to the increase and it's impossible to feel it. Moreover, the increase in torque is low, only sth like 4%.

It's well known that such increases can be obtained by making (essentially) the sparkling (i don't the technical words in english) earlier than it is programmed by the factory. It enables more power because fuel is burned quicker, but of course you have a increase in consumption, and probably the car would no more pass the air pollution tests.
That's what the engineer did on my car.

By the way, does anyone know another way to eliminate the speed limiter than via the software ? It seems that it could be deleted by the dealer as the mods !!
 

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Originally posted by Tom:
By the way, does anyone know another way to eliminate the speed limiter than via the software ? It seems that it could be deleted by the dealer as the mods !![/B]
Yes, check Kelleners and their "speed modul".
It is a external modul that removes the limiter. You can fit it and remove it very easily. If you have any problem (say you need to send your car to an unknown dealer), you can take it off in 5 minutes, so the car is standard.

It does not increase power output.
 

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Originally posted by MarkM5Lauderdale:
Funny, most optimizers I have spoke to said they will reprogram at no charge should the dealer have to reset the computer. This should play a major role in choosing any reprogrammer. Think you need to have some words with that programmer about what he has done. Something doesn't sound "right"!
Mark
But, you can't just reprogram your computer over and over. I have a friend who is a BMWNA engineer and he advises that the BMW computer can only be reprogramed around 12 times. BMW calls for computer replacement after 12 reprograming. Companies like Dinan and The Shark should not be telling customers that you can reprogram your computer as many times as you like. If you do, you'll be replacing your computer so, Further, per this engineer the computer starts deterioating even before 12 reprogramings. Sort of like automotive altheimers .
 

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Originally posted by MarkM5Lauderdale:
Funny, most optimizers I have spoke to said they will reprogram at no charge should the dealer have to reset the computer. This should play a major role in choosing any reprogrammer. Think you need to have some words with that programmer about what he has done. Something doesn't sound "right"!
Mark
But, you can't just reprogram your computer over and over. I have a friend who is a BMWNA engineer and he advises that the BMW computer can only be reprogramed around 12 times. BMW calls for computer replacement after 12 reprograming. Companies like Dinan and The Shark should not be telling customers that you can reprogram your computer as many times as you like. If you do, you'll be replacing your computer so, Further, per this engineer the computer starts deterioating even before 12 reprogramings. Sort of like automotive altheimers .
 

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As a Computer Network Engineer...."the computer wearing out after 12 reprograms" sounds very fishy.

What are they using, a magnetic stripe on cardboard?

07/00 M5 Tit/Silverstone
 

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Actually, they are probably using some kind of EEPROM (Electrically Erasable Read Only Memory) to hold the program. 'not really sure about the number of times they can be reprogrammed, but they are not designed for places which need constant changes (RAM is used for that). In general, they are used when the upgrade should be available, but is not very common. Erasing and reprogramming is done by applying higher voltages than are normally running through the cells (if I remember correctly), so it is possible that the system starts deteriorating after some reprogramming is done. I have had experiences reprogramming these over past few years, and it is not an exact science. Every now and then, the code does not go in the way it is supposed to. There is also a possibility that their design is modified to accommodate the higher vibration and temperatures present in the vicinity of the engine block (is it next to it or some other source of heat?)!?

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00' ///M5 Carbon Black/Black 6sp
98' 540i /Silverstone/gray 6sp
00' K1200RS /Blue-Silver 6SP
85' K100RS /Silver 5sp
 

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Tom, I still have some interesting things to tell you about the Swiss tuners. I don't want to tell these in an open forum before I get to you in a private way. Let me know if there is any way to reach you.
Bonne journée, Georges
PS is M. Deillon your mechanic (Marterey)?
 

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Tom,

As far as the power, my understanding is that it is accomplished by fine tuning the fuel/spark curves. And this in itself would probably require good quality high-octane fuel for full benefit. And you are right, a 7% gain could be felt after a car-to-car comparison, but would not seem like much after a few days. Kelleners dos make a speed module which is a separate box and is sold for about 2000 marks. For the benefit you are getting, let the dealer re-program your computer to factory specification, and forget you ever had it changed.

Dan
 
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