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Evosport Pulley Installed & Dyno'd.....

33K views 56 replies 33 participants last post by  M5Ghost 
#1 ·
Thanks to Simon for overnighting a pulley set I was able to get it installed today! I also appreciate the fact I could talk directly with someone who's been there and done that...

First impressions: Install time was a little less than 2 hours. Straightforward and simple (with the right tools)...
Tip: the idler pulley doesn't need to be removed - just lossen enough to slip the belt underneath.

Second impression: Dyno time. The shop was a little skeptical and hoped for at least a 5 rwhp improvement....well, needless to say they were impressed (as was I) with the results. My dyno runs almost mirror those posted on Evosport's web site. My car has the charcoal filters removed and sections 1 & 2 installed with stock mufflers out back.

Third impression: Driving -- the change is definitely noticeable. The car is quicker....wheel spin galore. The torque really kicks in at 4K rpm and doesn't relent until redline. You'll notice on the dyno chart how linear the torque is.....

This is the best bang for the buck since removing the charcoal filters!
 

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#2 ·
:cheers:
 
#5 ·
Just came in...

My Evosport Pulleys just came in today. Trying to get them installed this bFriday before the meet. Those Dyno numbers are incredible. LI-M5 just had his installed and is raving about it.....cant wait to feel the difference.:thumbsup:
 
#6 ·
DinodealM5 said:
My Evosport Pulleys just came in today. Trying to get them installed this bFriday before the meet. Those Dyno numbers are incredible. LI-M5 just had his installed and is raving about it.....cant wait to feel the difference.:thumbsup:
Let me know how your install/butt dyno results go, Dino. I may have to follow you and Neil if the reports are good:cheers:
 
#9 ·
wooohoooo !!! :biggrinbounce: i freakin knew it... my butt dyno was right on point !! :applause: i wish i could say more !!:grrrrr: :grrrrr: gotta get the dinan rear isssue figured out 1st...:mad: :mad:

toynut nice work :cheers: take the speculation right out of the equation..

NEIL....
 
#10 ·
NEWS FLASH: Power Pulley Kit for the M5/M6 is now $10,000 :biggrinbounce:
 
#15 ·
Good news!!

Wow. That's very good to see that the gains are present on back to back dyno runs. Unfortunately, I could not get my car on the dyno because my local shop cannot prevent the electronics from shutting everything down when trying to dyno. How were you able to get the dyno runs? I'd really like to put my car on the dyno and see how much power it's making now. You can PM if you'd like.

As far as seat of the pants difference, I did not have the same results. I don't know why, but I do not feel this huge gain that is being shown on the dyno.ouich
 
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#16 ·
I don't know if it's just me, my computer or poor scan of the graph, but I can't make out the graph too well.hmmm

I see the graph tracing but can't read the before and after numbers. Can someone read them to me?
 
#18 ·
TOYNUT said:
Second impression: Dyno time. The shop was a little skeptical and hoped for at least a 5 rwhp improvement....well, needless to say they were impressed (as was I) with the results. My dyno runs almost mirror those posted on Evosport's web site. My car has the charcoal filters removed and sections 1 & 2 installed with stock mufflers out back.
Were the sections 1 and 2 installed for the first dyn run? In other words, what modifications were added between the first and second run, just the pulleys or also the exhaust? And what about the filters?
 
#20 ·
///Marshall said:
Where are you guys getting the impression that these were back-to-back
runs? Maybe I'm reading it wrong but it looks like one run was made
4/29/06 @ 12:49:28 PM and the second was 3/6/07 @ 1:35:02 PM

:dunno:
Great catch!

That makes MRichmond's questions very important.
 
#21 ·
Either way given the significant increase and the butt dyno info it all looks very promising.
 
#22 ·
///Marshall said:
Where are you guys getting the impression that these were back-to-back
runs? Maybe I'm reading it wrong but it looks like one run was made
4/29/06 @ 12:49:28 PM and the second was 3/6/07 @ 1:35:02 PM

:dunno:
Good catch... How many miles did the car have on 4/29/06? Probably still in break-in period correct? How many miles does it have as of 3/6/07? On average I'd say 12K miles more. It is quite possible that most of the gains can be attributed to the pulley, but maybe some have to go to the engine making a bit more power post break-in... Just a thought....
 
#23 ·
I don't think it has much to do with breaking in the car but as MRichmond pointed out, the first dyno could be with the stock engine and the second one could be with the pulleys, charcoal filter removal and sections 1 and 2 installed.
 
#24 ·
To answer most of everyone's questions:

I'm still able to dyno my car because I refused the last BMW software update (I believe it's the one that allows the i-drive nav system to automatically skip the accept screen).

As for the dyno - yes, my car was baselined after the break-in period was completed on 4/29/06 and immediately dyno'd without the charcoal filters (same day, back to back). Since then we've added sections 1 and section 2 with stock mufflers on 1/13/07. Again, dyno was run after the install of those items (increase for the exhaust was minimal - 2rwhp).

The car currently has 9200 miles.

I can post the dyno results of each upgrade if that will help
 
#25 ·
I'm impressed that you've been diligent with not only documenting each mod, but testing each one on the dyno. Nice job! :thumbsup:

On a side note: how does the car sound with sec 1&2 replaced? is it comparable to any of the aftermarket exhausts? Thanks!
 
#26 ·
I can post the dyno results of each upgrade if that will help[/quote said:
That would be very interesting to see the progreesion.
 
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