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    • Before and after ER Racing F10 M5 S63TU V8 catless downpipes dyno in 4th and 5th gear on a Dynojet

      Just how big of a restriction are the stock F10 M5 S63TU catted downpipes? Well, fairly large according to the dyno results courtesy of BMS (Burger Tuning) below. You will notice there are two dynographs from BMS F10 M5 with is running their Stage I piggyback tuning box. The lower wheel horsepower graph is in fourth gear and the higher graph is in fifth gear. This is a good illustration of how changing the gear you dyno in can affect the torque reading.

      Remember the Dynojet is an inertia dyno so it is essentially measuring how fast a set weight is spun. Faster speed (like a higher gear) will change the result and skew figures. Fortunately @Terry@BMS dyno'd the car in both 4th and 5th gear to show the difference the ER Racing catless downpipes provide.

      The 4th gear baseline shows 598 wheel horsepower and 589 lb-ft of torque at the wheels. This goes up to 623 horsepower and 626 lb-ft of torque for a gain of 25 horsepower and 37 lb-ft of torque at the wheels. In fifth gear the baseline is 628 horsepower 637 lb-ft of torque at the wheels. Essentially, 30 wheel horsepower higher. Be wary of tuners who use higher speeds to try to skew figures or those show will show you a fourth gear baseline and then a fifth gear tuned run. It's an old trick that basically every tuner knows. Regardless, the post ER Racing catless downpipes run shows a gain of 9 wheel horsepower and 15 lb-ft of torque at the wheels.

      So which is closer to the truth? Well this goes to show how much dyno numbers can vary. The baseline runs were done in cooler weather so that definitely can have an effect on the results. Heat soak should be worse and set in more quickly in warmer weather so that may explain why the 5th gear runs show a smaller difference in the peak figures although the real gains are in the mid-range torque. The main thing to focus on is there are large torque gains in both runs showing the factory catted pipes are a point of restriction and that a good set of catless downpipes is a solid power modification on the F10 M5 S63TU V8.



      This article was originally published in forum thread: BMS/ER DP Dyno and 60-130 results started by Terry@BMS View original post
      Comments 15 Comments
      1. m54b25's Avatar
        m54b25 -
        A twin MEVD17.2.8 DME physical tune of the S63tu overboost code...will be coming soon Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by m54b25 Click here to enlarge
        A twin MEVD17.2.8 DME physical tune of the S63tu overboost code...will be coming soon Click here to enlarge
        Oh man... send me some details!!!
      1. Group.america's Avatar
        Group.america -
        Remember the Dynojet is an inertia dyno so it is essentially measuring how fast a set weight is spun. Faster speed (like a higher gear) will change the result and skew figures. Fortunately @Terry@BMS dyno'd the car in both 4th and 5th gear to show the difference the ER Racing catless downpipes provide.

        Maybe the smartest thing I have read on this forum ever !
      1. ezec63's Avatar
        ezec63 -
        And please use SAE numbers !!! Or give us both
      1. BlackJetE90OC's Avatar
        BlackJetE90OC -
        Vs. E63 (Renntech Intermediate Tune and RADO Hi Flow Pipes)




      1. ezec63's Avatar
        ezec63 -
        Goddamn that e63 took off ! & Thats just running the intermediate tune with hi flow cats a aggressive tune with cat less pipes will only make it faster. Cant underestimate BIG torque
      1. ezec63's Avatar
        ezec63 -
        Also doesn't look like MCT is not losing much if any ground to the DCT
      1. leveraged sellout's Avatar
        leveraged sellout -
        Can't remember, which gear is closer to 1:1 in this version of the DCT? Either way, this is great to see. The stock DPs are pretty restrictive. Someone on another site actually saw differences as large as 50 whp when switched to custom catless DPs (none were available in the market at the time).
        @m54b25 Are you serious!!!
      1. Jimefam's Avatar
        Jimefam -
        Click here to enlarge Originally Posted by leveraged sellout Click here to enlarge
        @m54b25 Are you serious!!!
        I wouldn't bet on it. I was told 2.5 years ago by bob brady that they were 60 days away from n63 ecu control and tuning. Still aint available.
      1. leveraged sellout's Avatar
        leveraged sellout -
        Click here to enlarge Originally Posted by Jimefam Click here to enlarge
        I wouldn't bet on it. I was told 2.5 years ago by bob brady that they were 60 days away from n63 ecu control and tuning. Still aint available.
        I really hope it's true. Been waiting so long for this, I have to imagine someone is coming close. I know AMS is working pretty hard on it too, and I'm sure Dinan is as well. Time to hire some kids from Anonymous...or maybe the guys who took off with the Mt. Gox bitcoin stash. If they can do that, they can crack a BMW ECU.
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by BlackJetE90OC Click here to enlarge
        Vs. E63 (Renntech Intermediate Tune and RADO Hi Flow Pipes)




        http://www.youtube.com/watch?v=5fguO...ature=youtu.be
        Yes the M5 was not running that well at the event. Best 60-130 on race day was only 8.2s. Click here to enlarge Maybe the weather or maybe the old can of race gas I had sitting in the garage wasn't as potent as I thought. In any event I've upgraded the car with a water/meth injection kit and will retime it shortly.

        That E63 ran 130mph in the 1/4 BEFORE a tune and exhaust revision at this race. It definitely moves! Also got raped by a 9 second capable Porsche.
      1. Jimefam's Avatar
        Jimefam -
        Click here to enlarge Originally Posted by leveraged sellout Click here to enlarge
        I really hope it's true. Been waiting so long for this, I have to imagine someone is coming close. I know AMS is working pretty hard on it too, and I'm sure Dinan is as well. Time to hire some kids from Anonymous...or maybe the guys who took off with the Mt. Gox bitcoin stash. If they can do that, they can crack a BMW ECU.
        AMS was never working on it they just were doing the hardware and that project is on ice too. And Dinan LOL even if they did crack it when have they ever made power? I am dying to buy an M5 but not until there is a real tuning solution.
      1. leveraged sellout's Avatar
        leveraged sellout -
        Click here to enlarge Originally Posted by Jimefam Click here to enlarge
        AMS was never working on it they just were doing the hardware and that project is on ice too. And Dinan LOL even if they did crack it when have they ever made power? I am dying to buy an M5 but not until there is a real tuning solution.
        Who did AMS farm out the software too? I wonder. My impression was that they were working on it themselves. Damn. Hope this turns out to be real then.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by leveraged sellout Click here to enlarge
        Who did AMS farm out the software too? I wonder. My impression was that they were working on it themselves. Damn. Hope this turns out to be real then.
        They announced a while ago they would not be doing the software themselves. Nobody really has a good grasp on the M5 ECU right now.
      1. leveraged sellout's Avatar
        leveraged sellout -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        They announced a while ago they would not be doing the software themselves. Nobody really has a good grasp on the M5 ECU right now.
        Alright must have missed that. How uncrackable can an ECU be...this is insane. I'd love to know how exactly they encrypt their ECUs....takes less work to break into the Pentagon.