My M6 Active AutoWerke mods! [SuperSprint headers + cats & AA ECU] - BMW M5 Forum and M6 Forums

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Old 29th August 2006, 06:04   #1
KeithTa
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My M6 Active AutoWerke mods! [SuperSprint headers + cats & AA ECU]

My Supersprint headers & cats have arrived so I am dropping off my M6 to Active on Monday August 28th in the morning. My car sits in stock form less the carbon air filters.

Here is the list of work to be done which should take approx 1 week to complete:

1) Base line Mustang Dyno & Dyno Jet runs
2) Next, Install Supersprint Headers and Hi Flow Cats (leaving stock back end of exhaust in place to minimize the exhaust noise) I realize there will be some loss in power. Nevertheless, I hear that the stock mufflers are a straight through design anyway so Im not expecting a terrible loss in power from the cats back.
3) Active ECU upgrade is next on the list. We will be tuning it to work along with the exhaust work and will be removing the top speed limiter. We will also run a few tests with red line set at 8500, 8600, & 8700 RPM. If power curve is strong we may be setting the red line at 8700.
4) Will finish off with final Mustang Dyno & Dyno Jet runs to audit the gains.
5) Pick up car from Active.
6) Waiting 2-3 more weeks for my Dinan 3.91 differential to arrive which is being installed by a local Dinan dealer/installer called "Foreign Affairs".

We are guessing the car may come in around 540-550 hp with all the mods including the diff upgrade with torque coming in at around 425 ft lbs.

Even though the diff upgrade will not add to the horsepower figures on the dyno, it will have a notable effect on torque and will likely make the car feel like its 300 lbs. lighter letting the revs climb easier. I am confident the Dinan differnetial will make for the "perception" of improved power across the entire RPM band in every gear at any speed. Therefore, I feel that the car will pull like it is packing 570hp.

Once the Diff install is complete, I will run the car back to Active for another dyno pass to see what affect the diff had on torque numbers.

Stay tuned to this thread for updates as install progresses at Active!
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Old 29th August 2006, 07:26   #2
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F*cking awesome man. Document as many dyno runs and log as much data as you can. It will come in handy for a lot of people here. Those are all the right upgrades - you've done your homework. Maybe a smart thing to keep the stock mufflers - I'm curious to know how it will sound. BTW - I think it would be nice to have a 9k rev limiter. What does Active say about that? You can tell when you hit 8250 that thing is still pulling like no tomorrow. And I have heard that engine was tested to like 14K rpm or something ridiculous like that.

Last edited by jfenley; 29th August 2006 at 07:29.
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Old 29th August 2006, 07:58   #3
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Pardon my ignorance on the subject of mods, but can anyone ballpark what all those mods may cost? 540-550hp with the feel of 570 is amazing. I never thought the mods would be worth risking the warranty but if you can get that machine at the right price it may just be.
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Old 30th August 2006, 06:30   #4
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Quote:
Originally Posted by jfenley
F*cking awesome man. Document as many dyno runs and log as much data as you can. It will come in handy for a lot of people here. Those are all the right upgrades - you've done your homework. Maybe a smart thing to keep the stock mufflers - I'm curious to know how it will sound. BTW - I think it would be nice to have a 9k rev limiter. What does Active say about that? You can tell when you hit 8250 that thing is still pulling like no tomorrow. And I have heard that engine was tested to like 14K rpm or something ridiculous like that.
I defienetly will. I am paying extra to have the car dynod on a Dyno Jet as well as the dyno passes on Active's in house Mustang Dyno. I think once the exhaust is in place we will run the Mustang Dyno numbers to see the difference in HP changes and then begin tuning the ECU to safely squeeze as much power out of the car as we can. We willl be tuning the fuel mixture carefully since the car might require more fuel on top end of the RPM band due to the exhaust and the higher red line.

1 Point to make - The Supersprint cats are not just a set of catylitic converter units. The cats actually come as a system welded into a mandrel bent pipe about 4 feet long. So the headers combined with the cats make up about 5 feet of exhaust piping. The back half of the exhaust really doesnt seem too restrictive so hopefully we get some decent gains out of the exhaust.
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Old 30th August 2006, 06:41   #5
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Quote:
Originally Posted by FyteOn
Pardon my ignorance on the subject of mods, but can anyone ballpark what all those mods may cost? 540-550hp with the feel of 570 is amazing. I never thought the mods would be worth risking the warranty but if you can get that machine at the right price it may just be.
Supersprint Headers: $6700 ish
Supesprint Cats: $4500 ish
Dinan Diff: $2499
Active ECU: $1000-$2000 (I am getting a custom tune so my pricing is a bit higher than $1000 they charge for the normal program)
Install on everything: $1200-$2000 (including dyno time etc) Headers take about 10-14 hours

So approximately $15,000.00

I know its expensive....But these mods include a collection of the most effective power producers for the M5/M6 cars available at this time.

Cat back exhausts on the M5/M6 have show no gains on the dyno at all some have show small gains. If you are looking for modifications that will MAKE a DIFFERENCE, I feel confident that this is the way to go.

Anyhow, stay tuned to this thread....I will post details as things progress.

PS....A Bad storm in S. Florida set us back 2 days on tuning.

Keith
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Old 31st August 2006, 01:16   #6
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Install Update

Called active today and they said they had completed the BASELINE dyno runs on BOTH the DynoJet and Mustang dynos. I will post the dyno results as soon as possible.

They have already began to install the headers. Once the install is done, we will run a dyno pass to see the gains for the headers and cats alone. Then we will begin tuning the ECU.

I was told by Active that they will be taking some pictures of the install as it progresses. Will post them asap.

Keith
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Old 31st August 2006, 01:37   #7
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I'm really surprised they were able to do any dyno runs... my computer shut down my throttle due to detected differences between front and rear wheel speed. I can't believe BMW would cripple the M5 and let the M6 continue to be dyno-able.

Also, unless the M6 is dramatically different than the M5, 10-14 hours to remove the stock headers and replace them with the SS units is extremely optimistic. My install took well over 20 hours. The heat shielding needs to be removed (and replaced) in order to bolt up the headers to the heads. This was very labor intensive. Even TMS took over 20 hours on the same install.

Not trying to flame, just comments from personal experience and talking to various shops.

I'm curious to see what Active can milk out of the ECU... keep us posted. Also, I'd like to know if you get the dreaded SES light... and if so, if Active can program around it.

Cheers.
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Old 31st August 2006, 11:54   #8
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PPG4, it can be dynoed, just trick the hood so it thinks it is closed.
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Old 31st August 2006, 16:48   #9
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Quote:
Originally Posted by Gustav
PPG4, it can be dynoed, just trick the hood so it thinks it is closed.
Supposedly, EvoSport did that; Bob made that clear in no uncertain terms. They weren't able to dyno my car or their own.
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Old 31st August 2006, 16:53   #10
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Hmm, strange. What did they do here:

Dyno of my M5 with K&N Filters (stock w/out charcoal filters)
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