M6 v10 performance datalog

[quattro]

Such pity that the superb V10 howl is no longer going to be there after fitting branches in place of existing decatted system. Hope the increase in performance is going to be worth the loss of that so distinctive trademark sound.
George, how we'll did Cleo's M6 go after the last round of tuning after fitting the branches?

 

[George Smooth]

Such pity that the superb V10 howl is no longer going to be there after fitting branches in place of existing decatted system. Hope the increase in performance is going to be worth the loss of that so distinctive trademark sound.
George, how we'll did Cleo's M6 go after the last round of tuning after fitting the branches?

They ran a 11.4 in East London with not so good traction so a .2 second improvement over its previous best of 11.6 at Matuba. The exits also improved by 4km/h. The car has had four different exhaust systems with the last three having the same branches but different sizes from there and back so a lot of work has gone into these exhausts to optimize them.

The M6 still has the howl so its not the branches. Cleo opted for a extra set of silencers and he also go the V8ish sound on his M5 so that silencer needs to be removed.

 

[quattro]

Thanks George, will talk to Tom junior and OB about the silencers to keep the V10 howl.

 

[quattro]

Hi Phantom,
Did you do the software last Friday as planned and if so, then what were the results? Was the car on a dyno before and after the software tune?
Who did the software for you?

 

[phantom]

Hi Phantom,
Did you do the software last Friday as planned and if so, then what were the results? Was the car on a dyno before and after the software tune?
Who did the software for you?

Yes software was done on Friday but we are giving the car 100km to settle on the new software.Car also went in this morning for the car to be regassed as the aircon pipes have to be disconnected when fitting the branches.
I do datalogging.That is what happens on the road.If we used a dyno it would just turn into a fight again about whose dyno is correct,correction factors etc.
We use the same track at 1471mts altitude, mb 861, temp 21degrees.
I try and scedule a run when we get close to those requirements.

The V10 sound that disappeared to me is the greatest disappointment.I think the thick metal for the exhaust system may be responsible.The original pipes are actually not very heavy and their thin structure might actually cause that tinny resonance we love.
Let me first do the datalog with the software and once posted you can decide if interested.The guys are not on the forum so rather PM me for details.

 

[Sherwin@xcede]

We have done 12 different branch designs on the V10 & they all lose the V10 howl & sound like a v8. Unfortunately, that's how it works & nothing can bring it back. But it does make up for it by fattening up the power curve pretty much everywhere, and especially at high revs. Definitely worthwhile.

I would also suggest a pulley for another 8-10kw & addressing the bearing issue by using a thinner oil.

 

[phantom]

We have done 12 different branch designs on the V10 & they all lose the V10 howl & sound like a v8. Unfortunately, that's how it works & nothing can bring it back. But it does make up for it by fattening up the power curve pretty much everywhere, and especially at high revs. Definitely worthwhile.

I would also suggest a pulley for another 8-10kw & addressing the bearing issue by using a thinner oil.

Do you stock the pulley?Price?

 

[phantom]

After seeing the picture of the OEM branches...I can see why the TNT branches would give some extra horses and most probably better power delivery through the rev range.

Just listened to the sound clip....It really does sound like a V8 haha
Any idea how you would get that epic V10 sound back? :=):

You need this sound in your life
[video=youtube]

This one is bored out to a 5.8L - but just hear that awesome sound
[video=youtube]

Same one doing 340km/h
[video=youtube]

But anyway....well done on the mods thus far & I hope you reach your goal :thumbs:

I wish I had the balls to buy an ///V10.

Been analysing these video's.This car does have the v10 sound but coupled to that have a look at the speedo video on road.That car does not go above 7500rpm in top gear.If you look at my original post you will see that the M5 had previously died at 7600rpm in top.(321km/h decline 6percent)
Speedo speed means nothing.The M5 V10 was only registering 310 on the GPS.,clock on 330.
This car had enough road to do more if he could.
I think Sherwin might have a point that in fact the branches are resposible for the sound change.This if true then gives the two options;

1)Branches giving v8 sound but able to rev to 8250rpm in top.
2)Exhaust only but get v10 sound but no power after 7600rpm in top.

 

[moranor@axis]

you can make the car have a higher pitch by removing the absorption type silencers and fitting reflection type silencers...

absorption type kills high pitch sound
reflection kills deep sounds

BMW use a combination of both types to give the sound they want...

you could just fit the OEM back box on and see if there are any losses in power this is what I would try 1st

 

[phantom]

you can make the car have a higher pitch by removing the absorption type silencers and fitting reflection type silencers...

absorption type kills high pitch sound
reflection kills deep sounds

BMW use a combination of both types to give the sound they want...

you could just fit the OEM back box on and see if there are any losses in power this is what I would try 1st

Agree that is what i want to suggest to the owner.Thanks for info.

 

[phantom]

Some pics of the system on the lift.

 

[phantom]

Not quite.
This car seems to have another limiter at the 7600rpm in top gear.Maybe that was the problem with the M5.



1/4 mile........12.8sec..........198km/h
800mts.........18.4secs.........233km/h
1km..............21.3secs.........248km/h
100-240........15.9secs

Not to shabby. :thumbs:

 

[sash]

shew.., almost there. When you say another limiter, one has been removed already?

 

[quattro]

Looking GOOD. How was your 60 foot time and 0-100, 0-200?

 

[phantom]

shew.., almost there. When you say another limiter, one has been removed already?

The original car comes with speed limiter at 262, this car did 264 probably due to new tyres and pumped to 3Bar.

---

Looking GOOD. How was your 60 foot time and 0-100, 0-200?

With the software the driver now gets the car off the line without too much fuss and with these Kumho tyres not bad times at all.
60ft.............2.44secs
0-100..........4.8secs
0-200.........12.9secs

 

[phantom]

Looking at these figures i think we need to get the car down to the lowveld with a set of tyres like George used and i think the 3rd dog might take the bone.With years of drag racing experience i found that the normally aspirated cars gained between 0.6 and 0.8 second.That puts this car on normal street tyres at a 12sec dead.Tyres as used by the previous guys give in the region of 0.7 to 1.0second based on track setup.Proof of the pudding is in the eating but based on the fact 1/4 exit here on the highveld is 198km/h this car has a real chance of doing 11.2 1/4 mile time with exit speed over 200.
Will the guys give me a PM when there is a meeting due.

 

[quattro]

Just for interest I looked back at some old quarter mile times as tested by Star Motoring. The first V10 M5 they did way back in October 2006 was fourth quickest overall and did it in 12.4 seconds, right behind a 2005 Porsche turbo and SL65 AMG at 12.3.
This could well have been a manufacturer's special for good road test results since when they did another M5 test in 2009 the M5 and then only managed 13.2 in the quarter.
These tests are all up here at Gerotek with road tyres so this first test model really was a VERY quick car. It would be interesting to know just what was done to that particular M5 to make it so quick but gives us something to aim at. Very much doubt it had b:thumbs::thumbs:ranches or anything obvious..........

 

[phantom]

Just for interest I looked back at some old quarter mile times as tested by Star Motoring. The first V10 M5 they did way back in October 2006 was fourth quickest overall and did it in 12.4 seconds, right behind a 2005 Porsche turbo and SL65 AMG at 12.3.
This could well have been a manufacturer's special for good road test results since when they did another M5 test in 2009 the M5 and then only managed 13.2 in the quarter.
These tests are all up here at Gerotek with road tyres so this first test model really was a VERY quick car. It would be interesting to know just what was done to that particular M5 to make it so quick but gives us something to aim at. Very much doubt it had b:thumbs::thumbs:ranches or anything obvious..........

If i look at those figures they were all good.However i have found the track surface ,weather conditions and different test equipment can scew results.Speed over a set distance is what shows more power.Time only shows tractability.
Originally when this car was bought it did a 12.9 and speed of 183 on a piece of pvt road near us.However when it was decided to mod we went to the race track.The same car there only managed 13.2 speed 175.It does not mean the car is slower,but just tested on a different stretch.This just shows when doing alterations stick to the same track,dyno etc for comparisons.
What counts for me is that the increments in speed on the 1/4 have gone up from 175 to 189 to 198.These tests were all done on 95 octane and our next test is on for the higher octane additive.
Watch this space.....:thumbs:

 

[phantom]

This car is running into the rev limiter hard at 7500rpm top gear.Anyone out there qualified to remove the limiter?

 

[George Smooth]

This car is running into the rev limiter hard at 7500rpm top gear.Anyone out there qualified to remove the limiter?

Didn't the software remove it?