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    • RennTech Stage I M157 V8 (63 AMG bi-turbo) turbo upgrade results on pump gas plus dyno comparison to performance package and standard M157 - 673 at the wheels

      Hot on the heels of Weistec displaying their M157 turbo upgrade Renntech is releasing their figures. The car in the dynographs below is a 2012 CLS63 AMG with the full Renntech ball-bearing turbo upgrade featuring billet wheels, Renntech filters, Renntech cooling system, and Renntech hi-flow cats / downpipes. The rest of the exhaust is stock and the pulls were done on a dynojet using 93 octane pump gas with no correction factor.

      Here are the numbers on the turbo upgrade car versus when it had the performance package:


      Peak figures are 673 wheel horsepower for the turbo upgrade car versus 509 wheel horsepower for the performance package. Torque figures are 739 wheel torque versus 536 wheel torque. A difference of just over 200 pound-feet at the wheels, quite significant.

      Here is a dyno comparison between the turbo upgrade, performance package, and standard M157:


      Over 225 rear wheel horsepower gain for the turbo upgrade versus the standard car and almost 300 pound-feet of torque at the wheels. Night and day figures.

      Keep in mind these numbers come on pump gas and are uncorrected. No doubt people will start comparing the peak figures here the Weistec numbers in SAE correction on 100 octane. Renntech states they intend to keep this stage fairly mild with pump gas world wide in mind and a tune pushing under 20 psi.

      Things are really starting to heat up in the M157 scene.

      This article was originally published in forum thread: RennTech Stage I M157 V8 (63 AMG bi-turbo) turbo upgrade results on pump gas plus dyno comparison to performance package and standard M157 - 673 at the wheels started by Sticky View original post
      Comments 40 Comments
      1. Jacob502's Avatar
        Jacob502 -
        those are all uncorrected runs...just to note. that 673 would equate to about 655 SAE. Solid gains though. Good job Renntech
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Jacob502 Click here to enlarge
        those are all uncorrected runs...just to note
        Yes, this was pointed out.

        Click here to enlarge Originally Posted by Jacob502 Click here to enlarge
        that 673 would equate to about 655 SAE. Solid gains though. Good job Renntech
        I would prefer SAE correction. This seems to be a more mild upgrade.
      1. Jacob502's Avatar
        Jacob502 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Yes, this was pointed out.



        I would prefer SAE correction. This seems to be a more mild upgrade.
        You got any photos for the upgraded turbos?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Jacob502 Click here to enlarge
        You got any photos for the upgraded turbos?
        This is all that is available at this time.
      1. Puerto Rican 335d's Avatar
        Puerto Rican 335d -
        Sticky, Call RENNtech Speak to Lenny tell him Axel sent you and I believe Hartmut and Lenny will provide the info required
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Puerto Rican 335d Click here to enlarge
        Sticky, Call RENNtech Speak to Lenny tell him Axel sent you and I believe Hartmut and Lenny will provide the info required
        No worries I speak to Lenny frequently.
      1. m54b25's Avatar
        m54b25 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        No worries I speak to Lenny frequently.
        If you really want to verify turbo lag on turbo upgrades, runs should be done in 4th gear (in which RT setup has not only increased better turbo response over stock OEM units). Otherwise runs in 5th Gear will show more power. I.e.: Same CLS63pp in 5th gear.

        Attachment 24765
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by m54b25 Click here to enlarge
        If you really want to verify turbo lag on turbo upgrades, runs should be done in 4th gear (in which RT setup has not only increased better turbo response over stock OEM units). Otherwise runs in 5th Gear will show more power. I.e.: Same CLS63pp in 5th gear.

        Attachment 24765
        That's a big difference.
      1. m54b25's Avatar
        m54b25 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        That's a big difference.
        Yes, indeed on the turbo cars w/pump gas. But, at the end of the day, it's "consistent repeatable smooth" track results that counts, rather just inglorious dyno numbers alone!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by m54b25 Click here to enlarge
        Yes, indeed on the turbo cars w/pump gas. But, at the end of the day, it's "consistent repeatable smooth" track results that counts, rather just inglorious dyno numbers alone!
        Personally I'm looking forward to the results from the drag strip.
      1. BK63AMG's Avatar
        BK63AMG -
        crazy numbers...on a luxury sedan, no less. With 4matic...GTR eaters.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by BK63AMG Click here to enlarge
        crazy numbers...on a luxury sedan, no less. With 4matic...GTR eaters.
        The 4Matic cars are going to be a very serious proposition from a stop. If only it had a dual clutch... but the autos will be easier to mod and so forth.
      1. m54b25's Avatar
        m54b25 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Personally I'm looking forward to the results from the drag strip.

        Will have it soon.
      1. Jacob502's Avatar
        Jacob502 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        That's a big difference.
        It actually Isnt!
        Look at the graph closely that was posted in 5th gear. Its against Wheel Speed and not Engine RPM, which on the dynojet software increases an automatic 18-25 rwhp. In addition, again the numbers are uncorrected, which again correlates to about 15-20 RWHP gains. The real numbers to that 709whp in 5th gear would be around 669-675 whp in SAE vs Engine RPM. The reason that 5th gear will pull better dyno numbers is due to the MCT transmission in the CLS63 having a close 1:1 ratio in 5th gear. Thats why in 3rd and 4th gears you will see lower numbers. 6th and 7th gears will also pull undesirable results due to the ratio being off. Best results will always be pulled between 4th and 5th gear. You can visit the Offical AMG website to find the exact gear ratios for any AMG car. I know this because I have the dynojest "WinPEP" software on my computer. I also know how different factors correlate to change in HP. The correct standardized and approved way to do it is to set the correction in SAE with smoothing set to 5 and value numbers runs vs engine speed. The same way Weistec did it with their graph for the larger turbos
      1. m54b25's Avatar
        m54b25 -
        Click here to enlarge Originally Posted by Jacob502 Click here to enlarge
        It actually Isnt!
        Look at the graph closely that was posted in 5th gear. Its against Wheel Speed and not Engine RPM, which on the dynojet software increases an automatic 18-25 rwhp. In addition, again the numbers are uncorrected, which again correlates to about 15-20 RWHP gains. The real numbers to that 709whp in 5th gear would be around 669-675 whp in SAE vs Engine RPM. The reason that 5th gear will pull better dyno numbers is due to the MCT transmission in the CLS63 having a close 1:1 ratio in 5th gear. Thats why in 3rd and 4th gears you will see lower numbers. 6th and 7th gears will also pull undesirable results due to the ratio being off. Best results will always be pulled between 4th and 5th gear. You can visit the Offical AMG website to find the exact gear ratios for any AMG car. I know this because I have the dynojest "WinPEP" software on my computer. I also know how different factors correlate to change in HP. The correct standardized and approved way to do it is to set the correction in SAE with smoothing set to 5 and value numbers runs vs engine speed. The same way Weistec did it with their graph for the larger turbos
        Here it is in SAE! Dynojet figures for turbo cars should be used in uncorrected, since SAE can either inflate or deflate the figure rather guessing a correction factor (not RPM, rather gear load).

        Attachment 24945
      1. LZH's Avatar
        LZH -
        Click here to enlarge Originally Posted by m54b25 Click here to enlarge
        Here it is in SAE! Dynojet figures for turbo cars should be used in uncorrected, since SAE can either inflate or deflate the figure rather guessing a correction factor (not RPM, rather gear load).

        Attachment 24945
        Exactly. It is in fact a big difference but as you said, putting the numbers down over and over at the track are all that really matter... some people never learn LOL.
      1. m54b25's Avatar
        m54b25 -
        Click here to enlarge Originally Posted by LZH Click here to enlarge
        Exactly. It is in fact a big difference but as you said, putting the numbers down over and over at the track are all that really matter... some people never learn LOL.
        LZH Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Jacob502 Click here to enlarge
        It actually Isnt!
        On paper it is as people tend to focus on peak figures.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by m54b25 Click here to enlarge
        Here it is in SAE! Dynojet figures for turbo cars should be used in uncorrected, since SAE can either inflate or deflate the figure rather guessing a correction factor (not RPM, rather gear load).

        Attachment 24945
        Well said.
      1. Jacob502's Avatar
        Jacob502 -
        Click here to enlarge Originally Posted by m54b25 Click here to enlarge
        Here it is in SAE! Dynojet figures for turbo cars should be used in uncorrected, since SAE can either inflate or deflate the figure rather guessing a correction factor (not RPM, rather gear load)
        You don't guess the correction factor! SAE runs estimate factors based on conditions. It will never deflate or inflate as you state. Here you posted the SAE graph showing less whp. Now please have the run against RPM and show us the real numbersClick here to enlarge