Manhart Racing Stage 4 Dyno Results are in... 645RWHP! - BMW M5 Forum and M6 Forums
F10 M5 Discussion 2010- Discussion about the next upcoming generation M5 based on the next generation 5-series, the F10.

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post #1 of 44 Old 6th March 2013, 05:23 PM Thread Starter
Manhart Racing
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Manhart Racing Stage 4 Dyno Results are in... 645RWHP!

Dear All,

as some of you may know we have recently developed a Stage 4 Performance Kit for the M5 F10. Yesterday we have strapped the car on an Independent Dynojet where we have also Measured the car in Stock form previously.


Our M5 F10 has put down 523,25 RWHP and 639,16 RWTQ on a Dynojet in Stock form which is pretty much in line what other stock M5 F10´s are putting down on a Dynojet.

With our MHR Stage 4 Performance Kit our M5 F10 managed to put down and impressive 644,30 RWHP and 898,65 RWTQ in the first run and 645,45 RWHP and 870,04 RWTQ in the second best run. Interesting enough is that the Horsepower difference between the 2 best runs is not that high but there is quite a big torque difference.

We did plenty of dyno runs throughout the day and these were the 2 best runs.

Our Goal was to hit the 700 ENGINE Horsepower which i believe we even topped. I will leave the drivetrainloss calculations to every each of you.

The Dyno runs were all done in 5th gear!

Our Stage 4 Performance Kit is available from NOW on.. Please send your inquiry to simon@manhart-racing.de



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Last edited by Manhart Racing; 6th March 2013 at 06:00 PM.
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post #2 of 44 Old 6th March 2013, 06:05 PM
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That is impressive and I really appreciate you posting before and after results and operating with RWHP. That is the most credible way to use dynoresults IMHO.

As tested this car has a 122hp (!!!) gain at the rear wheels. It's common to use a 15-18% drivetrain loss factor, meaning that the stock car had around 620HP at the flywheel (which also is in line with what others have tested).

The Manhart MH5S then has around 740-760HP at the crank!!!!!
(645x1,15 or 1,18 = 740-760)

Or if the drivetrain loss number of 15-18% is calculated from the crank HP, the results would be:

645/0,85 = 758HP (with 15% drivetrain loss - 758x0,85= 645RWHP)
645/0,82 = 786HP (with 18% drivetrain loss - 786x0,82= 645RWHP)

Not sure if people normally just add drivetrain loss of 15-18% to the RWHP figure or if they actually take the RWHP figure and divide it by the "drivetrain efficiency" factor...

Either way, this car is seriously impressive

Last edited by Boss330; 6th March 2013 at 08:18 PM.
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post #3 of 44 Old 6th March 2013, 11:40 PM
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Quote:
Originally Posted by Boss330 View Post
It's common to use a 15-18% drivetrain loss factor, meaning that the stock car had around 620HP at the flywheel (which also is in line with what others have tested).
Do you really think a stock car puts out 620hp or could it be more likely all these dynojets spit out at least 10% higher hp figures than what is actually hitting the ground? Throw in an STD correction and you can pump it up even higher. Takeaway...overall hp figures don't mean jack. What is important though is it looks like they gained 122hp (nice work). I would like to see a 60-130 time and compare those gains to stock.

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post #4 of 44 Old 7th March 2013, 07:15 AM
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Congratulations Franz!

This is indeed a huge achievement. Knowing how you guys work, I can well imagine the hundreds of hours you guys must have spent on development and testing. I am sure this is just the beginning and we shall soon see 4 digit hp numbers on these cars.

Are you guys developing any upgrades for the DCT? I am sure this is an area you guys are looking into.

Looks like I will have to get myself an F13 M6 very soon. I think I can live with an M6 with 4 digit whp and a bullet proof DCT; and die a happy man.

What modifications are included in your stage 4 package?

Wish you guys all the best.
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post #5 of 44 Old 7th March 2013, 08:36 AM
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Dynojets tend to give higher numbers, but I've seen MAHA dynos with over 500RWHP as well.

I don't really have any personal opinions as to what drivetrain loss figures or crank HP figures the F10 M5 have, but have just taken my info from what others have claimed in different posts. It seems there is a general consensus that the M5 is underrated from the factory and that it has over 600HP.

Regardless, Manhart has achieved 122 more RWHP which is impressive anyway
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post #6 of 44 Old 7th March 2013, 09:16 AM Thread Starter
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Quote:
Originally Posted by tjav8b View Post
Do you really think a stock car puts out 620hp or could it be more likely all these dynojets spit out at least 10% higher hp figures than what is actually hitting the ground? Throw in an STD correction and you can pump it up even higher. Takeaway...overall hp figures don't mean jack. What is important though is it looks like they gained 122hp (nice work). I would like to see a 60-130 time and compare those gains to stock.
Thanx alot, we usually do 100-200km/h and 80-250km/h runs...

I have attached v box results from our runs.

Here is a link with a stock run as well as a run with the 642hp Hartge Kit :BMW M5 F10 Test Drive with HARTGE Engine Upgrade 80 - 250 km/h - YouTube

Stock M5 F10 runs 80-250 km/H ( 50-155mph) in 19,93 Seconds
MHR M5 F10 runs 80-250 km/H ( 50-155mph) in 14,00 seconds
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Last edited by Manhart Racing; 8th March 2013 at 08:46 AM.
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post #7 of 44 Old 7th March 2013, 09:31 AM
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people should note that the torque is in Nm that is why it is so high

the M5 doesn't trap high enough to be making alot more than what BMW state regardless of what the chassis dyno says

"when they cant make big HP they start talking about torque"
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post #8 of 44 Old 7th March 2013, 02:03 PM
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Quote:
Originally Posted by digger View Post
people should note that the torque is in Nm that is why it is so high

the M5 doesn't trap high enough to be making alot more than what BMW state regardless of what the chassis dyno says
Sorry, I'm not quite getting what you mean by this?
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post #9 of 44 Old 7th March 2013, 02:28 PM
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Quote:
Originally Posted by Manhart Racing View Post
Thanx alot, we usually do 100-200km/h and 80-250km/h runs...

Stock M5 F10 runs 80-250 km/H ( 50-124mph) in 19,93 Seconds
MHR M5 F10 runs 80-250 km/H ( 50-124mph) in 14,00 seconds
Thank you for posting back. Would you happen to have the actual graph? Curious as to why you choose a 80-250kmh run? The 100-200km run makes sense for your metric system but why the 50-124km?

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post #10 of 44 Old 7th March 2013, 03:29 PM Thread Starter
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Quote:
Originally Posted by tjav8b View Post
Thank you for posting back. Would you happen to have the actual graph? Curious as to why you choose a 80-250kmh run? The 100-200km run makes sense for your metric system but why the 50-124km?
Well we have choosen this run based on the run another tuner did, so we wanted to compare our results with theirs

Well it also measured the 100-200 km/h run which was 6,3 seconds.
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