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Discussion Starter #1 (Edited)
Hi
I have had the Mark D'Sylva chip in my car for a week or so,
and just want to tell you what its all about:
(those of you that dont know allready :) )

Installation:
Mark was nice enough to send me a link to a generic
E34 chip-change guide, and by following that, it was easier than i thought to install it. I think it took about 30mins the first time, but now that i know just what to fiddle with, i can do it in 5-10minutes.

When installed i let it idle for a couple of minutes, and then took it out for a testdrive, and the first thing i noticed was that the "jump" in power that my car have allways had around 4000rpm was allmost completely gone. Now it feels just as powerfull, but no sudden jumps in power.
(ofcourse it still have much more power above 4000rpm, than below, but the jumpy caracter of the switchover is gone).
I also tested if he had left the revlimiter unchanged as we had agreed, and sure enough he had.

Ofcourse i wanted some numbers to go by, instead of just guessing by the feel of things, so yesterday i had booked time for a powertest at the local Bosch specialist.
Some might remember that i was there just after i bought the car also, and had the puzzeling reading on that test of "max enginespeed reached during test = 6580rpm". This should ofcourse be around 7250rpm, and i had specifically asked the operator about it, and he stated that there was no doubt it went all the way to the limiter during the test.
So yesterday i was asking the operator (another guy this time) about this again, and to make a long story short, he found out that the dyno would stop messuring if 200kph was reached.
So today we tested in 3rd gear to keep the speed down.
First test was stock chip, and after that i installed the Mark D'Sylva chip, and we did a second test.

By looking at theese printouts its clear that what i had felt around 4000rpm, was indeed a more evened out torque curve.
And it also looks like the torque is only higher than stock when above 6000rpm.
The difference is so little its impossible to feel.
And the HP curve to me looks to be a minute bit higher all the way through the rpm range, but again much to little difference to feel (<3% at peak difference).

I had wanted to do a topspeed test on the way to Nürburgring, or on the way back last weekend, now that the speedlimiter should be gone, but traffic and/or roadconditions prevented that.

My conclusion:
I like the feel of the less "jumpy" power delivery, so i will be keeping the Mark D'Sylva chip in.
As expected the powergains are too small to notice.

For the record, the tests where done on newly installed chips (install - idle for a couple of minutes - test) on both the stock and the Mark D'Sylva chip.

And the operator (claimed Bosch specialist, remember) said that the adaptive functions in the dme had no effect when at full throttle.
 

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I have a sample DaSilva chip in my M5 at the moment.

I have not posted about this as

1. It`s on loan,
2. I wanted to give Mark feedback on it first,
3. I haven`t updated my website with the detailed photo install that shoudl be better than the www.bmwe34.net guide with its small photos.

I agree that the almost Turbo like kick at 4200 rpm is now unnoticeable, the power comes on big style at 3k, and just holds al the way thru to redline, which is now 7500 on the sample chip I have in.

While I do not have access to a rolling road, the difference on the open road is massive, and I mean massive. The car is not the same. Whether it be because of the difference between the chip I have and the "for sale" one I don`t know. As I said, Mark is away for a few days so I want to talk to him first.

Donati, your results show none to minimal increase in torque and a little increase in BHP.

I swear that mine has a chunk of torque more. The sheer pull in second and third and er... fourth is definately a whole lot different, and I was trying to remain objective, ie not my brain telling me "I have a chip ergo I go faster !!"

No top speed runs yet, I have to find another Autobahn. Er. Yes.




Ivan.
 

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Discussion Starter #3 (Edited)
IvanDias said:
... to redline, which is now 7500 on the sample chip I have in...
Aye caramba! You are truely one brave M5'er :)
Engine brakedown will cost atleast half the cars value to repair.

I would like to see your car dynoed, as you mention massive difference stock vs. D'Sylva chip.
Why is this not possible for you? I'm sure there are plenty garages where you live, that have dyno's?
It is'nt expencive at all to have a powertest done, i payed dkr500,- (~eur66,-) for the tests, and there was 5-6 runs made.
(it took the operator a few runs to realize his dyno would stop functioning above 200kph).

If its a question of likvidity, we could arrange a "Get Ivans M dynoed" fund :)
I for one would be happy to chip in eur10,- or something like that to see your results.

I do think your chip has the same software as mine, except for the revlimiter, as i have not heard about Mark doing any revisions (not in open forums, nor in emails). Maybe Mark can elaborate on this?

But, youre happy with your results, thats the only important factor :)
 

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Donati-
You must have spoken with Mark D'Sylva about the rev limiter issue. I too spoke with him and the words sound very familiar. I chose to go the route Ivan did and raised my rev limiter to 7500rpm. I have to admit that it makes a notable difference in speed in each gear, especially 3rd and 4th. I can't see myself switching back unless someone can provide me with solid proof that the crank vibrations, valvetrain problems, or what have you actually do excist and do cause damage to the engine. That's just my two cents.

Nene
:viking:


PS: It is kind of odd that you feel a difference in torque but that there is no difference on the dynographs. Perhaps you just have gains in torque below the peak measurement, but that should show on the graph (the first picture is too hard to read). Maybe try to overlay the two graphs on the computer so you can tell for sure.
 

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Discussion Starter #5 (Edited)
Nene said:
Donati-
You must have spoken with Mark D'Sylva about the rev limiter issue.
I asked if the chip would change the revlimit, and Mark answered that i could have it any way i wanted, but that he would recommend sticking with stock limit.
This was what i prefered anyway, so thats what was agreed on.
We had no further discussions on that subject.

PS: It is kind of odd that you feel a difference in torque but that there is no difference on the dynographs. Perhaps you just have gains in torque below the peak measurement, but that should show on the graph (the first picture is too hard to read). Maybe try to overlay the two graphs on the computer so you can tell for sure.
I can certainly feel a difference right around 3700-4000rpm, where the power kicks in, but the feel is not that of having more or less power, it is the feeling of having a smoother switching from having a little power at low rpm, to having much power at higher rpm.
And i do belive this can be seen quite clearly on the graphs?
When comparing the stock printout to the D'Sylva printout, one can see that the D'Sylva torque curve is more straightened out at this rpm range.
What do you mean by "the first picture is too hard to read"?
It was scanned 1:1 size, and is basically just as easy to read as if holding the paper in your hands, i think.
Could it be your browser sizeing down the pictures to fit your screen? or am i missing the point?

PS. I have no clue HowTo overlay the graphs to make it easy to see differences, any suggestions?
 

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Mark warned me about the 7500rpm limit. I did not ask for it. The sample chip was in the UK, and so I borrowed it just for testing.

I don`t intend to spend any time at 7500!! My engine is twelve years old !!

No, time, big update over late weekend.

IDC
 

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quote from bmwfaq site install.

"From: Rob Levinson [mailto:[email protected]]
Date: Sat, 27 Oct 2001 02:24:24 -0400
Subject: Re: [M5] ECU Install, and Mark's chip.
You should expect a short period before the new software "kicks in". My understanding is that it is better to drive the car hard during this initial adaptation for best "learning" results, that's the only "procedure" to be followed. "


Ok. Done that. LOL.
The things a fricking missile.
 

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Donati said:


I asked if the chip would change the revlimit, and Mark answered that i could have it any way i wanted, but that he would recommend sticking with stock limit.
This was what i prefered anyway, so thats what was agreed on.
We had no further discussions on that subject.

Hi Finn,

I don't think I said you could have any rev. limit. Here is what was discussed:

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DONATI > The chip leaves the stock rev limiter in place, right?

Mark > YES, unless you want a higher rev. limiter (not recommended)

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Just to clarify, I don't usually send any chips out with a higher than stock rev. limit, and don't recommend that you use a higher rev. limit chip. I originally shipped a total of four "pre-production" versions with a higher rev. limit, 3 to the USA and one to the UK. The only difference is that they have a higher rev. limit, the timing and fuel maps are identical.

Ivan is using the test chip I originally shipped to someone else last year. (and that person has the lower rev. limit version now)
I just use that higher rev. limit version as a sample chip for a few people in the UK to try out. Even though the 7500 rpm limit is not recommended, it's still relatively safe to use for a few weeks while evaluating the chip, especially if you don't take it up to the limit often. There are quite a few cars with the early Dinan chip which has this rev. limit also, and they are still running...

I'm sorry you didn't notice the dramatic inrease that 98% of the other M5 owners experience. There was only one other person (in the UK) that said he did not notice much diiference with the chip.

I'll refund your purchase if you feel it's not what you expected.

Regards,

Mark
 

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Discussion Starter #11
MarkD said:


Hi Finn,

I don't think I said you could have any rev. limit. Here is what was discussed:

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DONATI > The chip leaves the stock rev limiter in place, right?

Mark > YES, unless you want a higher rev. limiter (not recommended)

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Different words with the same meaning? (can have higher limiter if wanted).

I'll refund your purchase if you feel it's not what you expected.
Not nessesary, it is as expected :)
 

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Hi Finn,

yes I thought about that before I posted the last message, and figured it could be interpreted that way. I should have said "No, I only sell a 7200 rev. limit chip now" as I don't even want to ship any other version.

I'm quite sure the performance increase everyone else feels is not imaginary. Your car is just not responding the same way. One car in the UK also had very little increase with the chip.

Regards,

Mark
 

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Discussion Starter #13
Mark said:
...I'm quite sure the performance increase everyone else feels is not imaginary. Your car is just not responding the same way.
Somebody else must have done a dyno comparison? and maybe posted the printouts to you?
(Would love to see Ivan Dias' car dynoed with both stock and Mark D chip).
 
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