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E34 M5 Discussion 1988-1995 Sedan and Touring


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Old 10th October 2008, 22:04   #11
davidoli
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I feel that many of us have become too reliant on diagnostic testing as a method of problem solving and that many of the good old school mechanics are well aware of the issues that cause certain running conditions , based on years of experience .

Sensors are great , when they work correctly .

A good old fashioned plug chop can provide a clear indication of fuelling .

I hate the feeling of being baffled with science and thankfully , the E34 M5 is not that scientific a car !
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Old 11th October 2008, 00:03   #12
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And that's fine, I own other cars that don't need be running at 100%. However, in regards to the M5, I won't be satisfied until it is at 100% and when I hear from a BMW specialist (lots of E34 work) tell me I'm wasting my money if the sensor shows up ok on the computer, I start having doubts.

It's very nice to have so much knowledge and experience on this board so I can hear different inputs. Especially since it's difficult to find local expertise given how rare those cars are.

I would have bought a different car if I didn't want the M5 to run as well as it possibly can. On the other hand, getting there is half the fun!
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Old 11th October 2008, 02:52   #13
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Quote:
Originally Posted by davidoli View Post
I hate the feeling of being baffled with science and thankfully , the E34 M5 is not that scientific a car !
Agree to an extent Davros, but that's quite important as when I tell people we're opening a garage I always get "but what about all the car computer stuff? you need a 10K laptop!" etc.

The reality is that it's all bollocks - it's a bloody car, with a bloody engine, that takes in fuel and spits out crap - the sensors just get in the way!

I'm a computer expert (a proper, honours degree, 25 year experience expert!) - it's about the only bloody thing I'm confident with ... I know how the bits flip and I know how the programs work .... how hard can it be? Really?!

My old boy (god rest his soul of last month....) couldn't get his head around my Honda's engine no matter how much I told him it's just like his old engines (he was a Torpedo engineer - compressed diesel engines at some scary BAR figure, effectively turbo-charged underwater engines running off compressed air) - but he just couldn't understand that the computer just replaced the carb .... giving a bit more precision to help emmissions etc...

So don't all you lot think cars after our beloved M5s are any more complex -they're not .... in many ways, they're much simpler!! Look at the M5 - lots of custom bits over and above a stock BMW .... your modern M5 is a bloody 520 with a bigger engine FFS ... it's that simple to fix ... and don't let anyone fool you that you need the stealer software to do so ... you don't .... just a bit of expertise and a bit of knowledge!

PS: If anyone takes an E60 M5 to our garage then I'll send you right up to the stealer and their fancy diag equipment

Last edited by nebpor; 11th October 2008 at 03:10.
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Old 11th October 2008, 10:22   #14
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How's the hangover this morning Stephen ?

God bless your Dad and God Bless you !

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Old 11th October 2008, 11:19   #15
nebpor
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As bad as expected mate, as bad as expected ..... must remember not to go near computers smashed
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Old 11th October 2008, 12:19   #16
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Originally Posted by nebpor View Post
As bad as expected mate, as bad as expected ..... must remember not to go near computers smashed
+1. But it's so much harder to remember that when you've had several too many....

Computers are the one thing I really struggle to understand as well as I'd like. I would love to be able to run exhaust analysis on the fly and tweak my standalone management as part of a much simplified electrical system, but it would all go so wrong so quickly!

Slightly OT. The extra simplicity of my suspension delete has given me so much peace of mind. The stripped cars like David's have the same appeal for me (though being older than my years I'd find it hard to ditch the soundproofing!), it would be relatively easy to make a simple robust wiring loom for lights and essentials, and I think you could eliminate many reliability issues and some excess old components this way. In a car with a simpler electrical system it would be easy to fit a Stack instrument system for example, but I'm sure the DME would have conniptions at losing speed inputs and so on. I've found the E34's electrics baffling
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Old 11th October 2008, 19:38   #17
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It would indeed all go wrong and all go wrong quickly - which is why I never bought a DTA data cable for the Honda - I'd just tinker!

I also agree that with a stripped car you could make the loom much simpler - remove the external temp sensor, the computer etc .... my racecar is like that - makes working on it easier.

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