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Discussion Starter #1 (Edited)
My only mod so far is removing the charcoal filters. I had one run at 417 - I'm told I have a pretty strong car for stock. For comparison those that have dyno numbers with same setup please post.

 

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Looks like you dyno'd your car in 4th gear. I pulled 422.x stock with carbon air filters removed.

5th gear pulled in low 430s.

Keith
 

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Discussion Starter #3
Good call, the pull was done in 4th. You obviously know more about this than I do. Also the car seemed to run on the rich side, perhaps that is normal for stock?
 

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Looks like you dyno'd your car in 4th gear. I pulled 422.x stock with carbon air filters removed.

5th gear pulled in low 430s.

Keith
Keith,

Maybe u can chimp in on my dyno thread I posted especially a/f ratio. I pulled 399hp (CF removed, section1&2+stock muffler, K&N filter). Then after Evo pulley+exhaust, the car pulled 402hp. Then it pulled <400hp after BMC filter installed. I used Dyno Dynamic all on 5th gear (temp 82-92F) I'm ouich:confused2right now...

Thanks.
 

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My experiences using dynos as a measure of HP before and after mods has been baffling.

My M6's Mods are:
Carbon air filters removed
K & N stock filter replacement
Supersprint Headers Supersprint Cats
Superprint X-Pipe w/ SS Resonator
Supersprint Sport Mufflers
AA Cam ECU Tune
3.91 Dinan Differential
Schrick Kelleners cams
Evosport Pulley

The cams showed no HP gain - maybe even a loss, the Pulleys a VERY small gain (on one dyno the pulleys showed a loss, the 3.91 diff showed a power loss (see my thread to understand this), the 3 combined components: SS cats, SS resonator, and SS sport mufflers showed a 7.5 whp gain. Headers with software showed a gain of 37 hp...or something (dont recall exactly) (see ALL my old threads for complete information on these tests and reviews) Get this.....I have even done dyno runs after all my mods and have shown HP numbers that were LOWER than when my car was mildly upgraded.

Bottom line, there are simply too many factors that influence the numbers coming out of dynos. I dont fully trust these numbers - I only use them as a guide to see if my car upgrades are moving in the right direction.....but my most recent runs have been "so off" I dont even bother with dyno results anymore.

All I know, is that my car is trapping 120-121 in the quarter mile. It gets consistant 12.1s spinning 1st, 2nd, & a bit into 3rd. The car will run an 11.99 or better if it had traction.

Regardless of what the dyno says, the car moves. So, I wouldnt get too bent out of shape over your dyno results. The best way to gauge your results is to baseline your M5 against another M5. Then install your upgrades and run the cars again. You may be surprised that even though the dyno showed a loss, the race may prove different.

My recent run against my friends Nitrous M6 (nitrous off) I beat him by 7-10 cars or so.....Gustav was in the cars when we raced...he also has the videos of the race with and without Nitrous (hopefully he will post them soon)

Bottom line - what I am trying to say here is that the dynos didnt show me anything close compared to what I saw in the race.

Keith




Keith,

Maybe u can chimp in on my dyno thread I posted especially a/f ratio. I pulled 399hp (CF removed, section1&2+stock muffler, K&N filter). Then after Evo pulley+exhaust, the car pulled 402hp. Then it pulled <400hp after BMC filter installed. I used Dyno Dynamic all on 5th gear (temp 82-92F) I'm ouich:confused2right now...

Thanks.
 

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My experiences using dynos as a measure of HP before and after mods has been baffling.

My M6's Mods are:
Carbon air filters removed
K & N stock filter replacement
Supersprint Headers Supersprint Cats
Superprint X-Pipe w/ SS Resonator
Supersprint Sport Mufflers
AA Cam ECU Tune
3.91 Dinan Differential
Schrick Kelleners cams
Evosport Pulley

The cams showed no HP gain - maybe even a loss, the Pulleys a VERY small gain (on one dyno the pulleys showed a loss, the 3.91 diff showed a power loss (see my thread to understand this), the 3 combined components: SS cats, SS resonator, and SS sport mufflers showed a 7.5 whp gain. Headers with software showed a gain of 37 hp...or something (dont recall exactly) (see ALL my old threads for complete information on these tests and reviews) Get this.....I have even done dyno runs after all my mods and have shown HP numbers that were LOWER than when my car was mildly upgraded.

Bottom line, there are simply too many factors that influence the numbers coming out of dynos. I dont fully trust these numbers - I only use them as a guide to see if my car upgrades are moving in the right direction.....but my most recent runs have been "so off" I dont even bother with dyno results anymore.

All I know, is that my car is trapping 120-121 in the quarter mile. It gets consistant 12.1s spinning 1st, 2nd, & a bit into 3rd. The car will run an 11.99 or better if it had traction.

Regardless of what the dyno says, the car moves. So, I wouldnt get too bent out of shape over your dyno results. The best way to gauge your results is to baseline your M5 against another M5. Then install your upgrades and run the cars again. You may be surprised that even though the dyno showed a loss, the race may prove different.

My recent run against my friends Nitrous M6 (nitrous off) I beat him by 7-10 cars or so.....Gustav was in the cars when we raced...he also has the videos of the race with and without Nitrous (hopefully he will post them soon)

Bottom line - what I am trying to say here is that the dynos didnt show me anything close compared to what I saw in the race.

Keith
Good response. I personally not obsessed with dyno result, just curious. Like u said, just want to make sure I'm moving on the right direction. I don't want to spend extra money to down grade my car, that sound so stupid and make me look foolish. I may try to get some run with stock M5 for comparison.

Thanks.
 

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keang24, the way KeithTa explained it is the way it goes with mods and he's seems to have traveled a long road. With all my mods I went from 408 to 460 rwHP. I had expected more and was initially disappointed but the mechanics of how mods work and their synergy or lack of synergy at times only God could know. With these cars you spend alot and get very little. Good luck m5Ranger
 

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M Ranger you will get more power by putting the stock mid section back in (cats and resonators) you need back pressure. I had your set up SS headers sec 1&2 and race exhaust. Car has more power and runs better with stock mid section in. That was my experience
 

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M Ranger you will get more power by putting the stock mid section back in (cats and resonators) you need back pressure. I had your set up SS headers sec 1&2 and race exhaust. Car has more power and runs better with stock mid section in. That was my experience
Avery & M5Ranger, both of you running SS header with stock 2nd cat and resonator? I consider just stock 2nd cat (still with x-pipe) when installing my Evo header(initially just for loudness reason, but if the car has more power and feel better, I would take it as a plus). I still anxiously waiting for response from neighbor about my new exhaust(Arqray), hopefully with header will not be any louder.
 

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I agree with Keith. My car shows only 445rwhp on an archaic dyno, but the races I have done tell a different story.
 

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I agree with Keith. My car shows only 445rwhp on an archaic dyno, but the races I have done tell a different story.
Come on Russ its not like you beat super charged Viper or any fast cars like that.
 

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why do people dyno in 4th and 5th gear when 6th is direct drive?
 

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Your car definetly moes. I rememebr saying to RECONM6 that "I wonder why Keith is pissed, his car is FAST". :M5rev:

My recent run against my friends Nitrous M6 (nitrous off) I beat him by 7-10 cars or so.....Gustav was in the cars when we raced...he also has the videos of the race with and without Nitrous (hopefully he will post them soon)

Bottom line - what I am trying to say here is that the dynos didnt show me anything close compared to what I saw in the race.

Keith
 

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why do people dyno in 4th and 5th gear when 6th is direct drive?

can you dyno in 6th gear if your car is not delimited? Wouldn't you hit the top speed limiter in 6th?
 

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why do people dyno in 4th and 5th gear when 6th is direct drive?
Two reasons:

1) my dyno shop's dyno cannot handle the speed the M5's can make in 6th gear. We did one dyno in 6th and the in-ground dyno went nuts due to excessive speed needed to hit redline

2) we hit the speed limiter before we could end the dyno

Cheers,

Darren
 

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Two reasons:

1) my dyno shop's dyno cannot handle the speed the M5's can make in 6th gear. We did one dyno in 6th and the in-ground dyno went nuts due to excessive speed needed to hit redline

2) we hit the speed limiter before we could end the dyno

Cheers,

Darren
You should be able to hit the hp peak just before the speed limiter in 6th IF you have the 3.91 diff. Any gear less than 6th (1:1) will give you a reduced hp reading, so the dyno results we're seeing are a bit lower than the actual hp.
 

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Is it valid to extrapolate the RWHP in 6th, e.g.,:

1. Do a dyno in 6th up to its rpm/speed limit.
2. Do another dyno run in 4th noting the power output at the same rpm in #1.
3. From the same #2 dyno run (in 4th) get all of the normal figures up to and including peak RWHP. Multiply these by #1/#2 to factor out the extra transmission loss when running in 4th. It would seem that these would represent (assuming fairly linear loss) the output in 6th were that possible.

Tom
 

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well, I had them dyno my car in 6th and the only issue was that I did hit the limiter in 6th, but I think the dyno I was on can handle the speeds, it just cut out at 7400rpm because of speed limited.
 

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well, I had them dyno my car in 6th and the only issue was that I did hit the limiter in 6th, but I think the dyno I was on can handle the speeds, it just cut out at 7400rpm because of speed limited

2008 Interlagos Blue M5
Every option except HD radio
Tubi-style exhaust
Charcoal filters removed
431whp at 7400rpm with 850 rpm to go!!
You would have easily hit the HP peak of 7750 with the 3.91 diff.
 

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Dyno's are the conventional way for measuring whp. A better way IMO is to look at trap speeds at the drag strip. This way there is cool air flowing into the engine and is also better for cooling. If you add a mod and your trap speed goes up under similar conditions then you know you gained power. Theres also ways for correcting for different altitude, humidity, and temperature.
 
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