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08-20-2013, 11:26 PM | #199 | |
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08-21-2013, 04:58 AM | #200 | |
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The tune files on all of the Z4M's in stock format are exactly the same. They all run the same and the only reason they all dyno differently is because of : Temperature and therefore temperature compensation maps Tyres on the dyno (yes they do make a difference) Gear used Fuel grade Efficiency of spark plugs Efficiency of other sensors We have dyno tested hundreds of S54's on our own machine and the shape of the curves are almost identical on 99%. The peak HP and torque figures can vary and this is down to how much ignition timing is being run on that particular test. On cars with tunes the same variance applies. Compensation is very aggressive on the MSS70 DME, far more aggressive than MSS54. As mentioned before in this thread and many others, there are multiple ignition target maps and they vary vastly. All depends on what ignition map the DME decides to run based upon it's logic. Easy way (but not so clever way) around this is to set all of the ignition maps to they are equal to each other :-) As for the additional stress of the tune. Well, we don't run them lean. We don't use too much timing. We most certainly don't make them knock or even come close to that. We know this from thousands of miles of running them and logging the knock values. We have multiple race cars out there running our tunes and never once a problem. Our tuning strategy is not aggressive and never has been. After market parts can change things very much. Cheap headers with poor flowing merge collectors and incorrectly made deCAT pipes do cause issues and physical factors like these cannot be tuned out in some cases. Incorrect setup of the cars also cannot be dialled out in a tune. Blocked OEM CAT's cannot be dealt with. There are multiple threads on m3forum.net where people have had problems and we spend as much time as necessary to fault find and make the cars run as they should. We have had cases of popular exhausts (not Italian) causing very high back pressure due to incorrect pipe diameters being used. We have seen headers with very much blocked CAT's. Poor headers. You name it, we have experienced it and gone through hell and back with customers! Then there is the discussion about the DME itself. This is mostly a target based DME. The ignition timing is not fixed and has huge variability. The AFR is fixed to a degree but that doesn't often tend to be a problem. VANOS is target based but has little compensation. So on and so on. Custom tuning each individual car has never yielded much gain unless we change the strategy of the tuning. We've had a few die hard guys come here and argue with us on custom tuning. We have put the tuning in their hands, explained how the DME works and then they immediately understand it is rather pointless in most cases. What we say to everyone is this - make sure your sensors are all working. Make sure if you can your cam timing and valve clearances are where they should be. If you are going to invest thousands in tuning then at the very least make sure everything else is working as it should and DO NOT BUY cheaply made parts (irrespective of price) for these wonderful engines. As a minimum I would say everyone should have new spark plugs, valve clearances and new pre CAT 02 sensors fitted before any type of tuning is done. Adam's car is a 59,000 mile car and by no means a garage queen. This is a car that is used and enjoyed like it should be. Everything is in working order, no errors of any type, every sensor is doing what it should. |
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08-21-2013, 02:18 PM | #201 |
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Pretty excited for this! :excited: Can't wait for videos. Fly-bys, and inside the cab if I may make requests hahaha
Once the pricing comes out I'm sure I'll have a few more questions specific to my situation that I'll PM one of you guys about, to not clog up the thread.
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08-22-2013, 07:30 AM | #206 |
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Fantastic!!
Quick question with regard to the raw carbon...on aircraft whenever we see bare carbon we have to refinish the damaged area before water ingress manifests and starts to delaminate the sheets.... How does raw carbon used in "my" airbox react to water due to driving in heavy rain or a quick sprinkle with a hose? |
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08-22-2013, 01:44 PM | #208 | |
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Dyno tested. +30 hp, graph is totally different now and the car now is finally out of lowered conditions. We had another Z4M in today, dyno tested it and it over laid your graph almost exactly, also running lowered conditions. See you tomorrow! |
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08-22-2013, 01:46 PM | #209 | |
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When do we get graphs |
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08-22-2013, 01:51 PM | #211 |
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08-22-2013, 01:59 PM | #212 | |
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Hmm not aware of anyone paying u guys a visit except Byron but ill ask around.... I think ppl are desperate for videos |
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08-22-2013, 02:48 PM | #214 | |
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30hp is v impressive!! John (exdos) just said it was him who popped over, he is v v impressed! |
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08-22-2013, 03:03 PM | #216 |
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08-22-2013, 04:58 PM | #217 |
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Drives: Z4 M Coupe
Join Date: Jun 2009
Location: Paphos
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30hp sounds incredible. Was expecting low 20s at best. With cams as well it would be a beast!
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08-22-2013, 06:11 PM | #218 | |
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Seems as though many of them are looking at many dyno tests. Had it been running the optimal map setting the gain would be as you say around low 20's. |
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08-22-2013, 06:14 PM | #219 |
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08-22-2013, 06:22 PM | #220 |
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Nice work evolve and WOOT'S!
How is the idle? ...I've seen two e46 m3 with csl boxes that have an idle that hunts otherwise run flawless. One was your box and software other was bimmerworld box and epic software. |
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