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  1. #1
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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:

    Click here to enlarge

    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:

    Click here to enlarge

    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.

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    0 out of 1 members liked this post. Reputation: Yes | No
    those are all uncorrected runs...just to note. that 673 would equate to about 655 SAE. Solid gains though. Good job Renntech
    Weistec Supercharged SL63 AMG
    Click here to enlarge
    Fastest Overall Mercedes SL Class VBOX 60-130, 6.86-
    Dragtimes.com, FEB 16 2013







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    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.

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    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?
    Weistec Supercharged SL63 AMG
    Click here to enlarge
    Fastest Overall Mercedes SL Class VBOX 60-130, 6.86-
    Dragtimes.com, FEB 16 2013







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    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.

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    Sticky, Call RENNtech Speak to Lenny tell him Axel sent you and I believe Hartmut and Lenny will provide the info required

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    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.

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    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.

    Click here to enlarge

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    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.

    Click here to enlarge
    That's a big difference.

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    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!

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    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.

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    crazy numbers...on a luxury sedan, no less. With 4matic...GTR eaters.

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    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.

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    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.

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    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
    Weistec Supercharged SL63 AMG
    Click here to enlarge
    Fastest Overall Mercedes SL Class VBOX 60-130, 6.86-
    Dragtimes.com, FEB 16 2013







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    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).

    Click here to enlarge

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    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).

    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.

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    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

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    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.

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    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).

    Click here to enlarge
    Well said.

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    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
    Weistec Supercharged SL63 AMG
    Click here to enlarge
    Fastest Overall Mercedes SL Class VBOX 60-130, 6.86-
    Dragtimes.com, FEB 16 2013







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    2 out of 2 members liked this post. Reputation: Yes | No
    Click here to enlarge Originally Posted by Jacob502 Click here to enlarge
    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
    +63

    SAE will certainly neither inflate or deflate at the same time. Its either one or the other. Put that CLS63 on four different runs like the one above and you will find that when switching between SAE and Uncorrected, the Uncorrected graphs will give higher numbers with almost the same exact value. I witnessed this on a same dynojet224 with my friend's TT Supra.



    SAE vs Engine RPM with a smoothing set to 5 is the approved method when measuring whp on
    a Dynojet 224. Everything else doesn't matter and will show higher power values.

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    ridiculous! I wonder who will be needing this upgrade in Long Island lol

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    Honestly, who gives a $#@! if the dyno is corrected or uncorrected? The gains are the most important factor.

    Peak numbers are for bench racers.
    2012 CTS V - Sedan - 6AT

    Stage 1 Mods:
    - 2.5 upper pulley, Ported snout/throttle body, Fluidyne HX, Airaid CAI w/green filter, ID850 injectors

    Stage 2 Mods:
    - American Racing Headers w/X-pipe, 9.1 Lower Pulley, Tune Time Custom Cam, Moroso Dual Catch Cans, Zl1 Lid, Norcal Tank

    Stage 3 Mods:
    - LSA ported/polished heads, 4.5" G-Force intake, Nick Williams 102mm T-body, 8.6 Lower Pulley

    12.18 @ 118.98 - STOCK
    10.87 @ 127.02 - STAGE 1
    10.53 @ 131.31 - STAGE 2
    10.47 @ 133.20 - STAGE 3

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    Click here to enlarge Originally Posted by Jacob502 Click here to enlarge
    It will never deflate or inflate as you state.
    Mind stating why it will never deflate or inflate? Because he's right, it can.

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