SL55/63/65/R230 AMG: OEM larger Throttlebodies for SL63?
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Joined: Apr 2018
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2009 SL63, 1999 E300 (462k miles and counting)
OEM larger Throttlebodies for SL63?
The intake manifold has some corrosion and needing to pull it off and fix. While in there, are there other things I should consider doing?
I assume the larger TB's that are sold are just repurposed OEM units. Does anyone know what those are from?
I assume the larger TB's that are sold are just repurposed OEM units. Does anyone know what those are from?
MBWorld Fanatic!
Joined: Dec 2005
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From: NJ
2009 SL63 AMG
You need a M156-specific adapter plate and tuning to account for the larger throttle bodies. Velocity stacks are also key.
Here's a complete kit for reference: https://www.vrpspeed.com/product/vrpm156tb/
Alternatively, if you're just doing preventive maintenance, RMT sells an upgraded plate that works with the stock throttle bodies: https://rebuildmastertech.com/merced...it-1561400801/
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Joined: Apr 2018
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2009 SL63, 1999 E300 (462k miles and counting)
M113K uses the same 74mm TB as the M156....so in theory bolt pattern is the same, and the M113K TB adapters would work with the 550 TB's in the stock RMT plate.
Sounds like folks havent tried this before..
Sounds like folks havent tried this before..
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Joined: Jun 2023
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2018 AMG E63s Ed1
Why do you want a bigger throttle body? All that does is lose authority over the torque of the motor... read, ever see those mustang and chargers go completely out of control? Usually because they have a to big a tb and when they shut the throttle, to late, the engine still gulping lots of air and happy fish tailing we go!
As long as the TB is not forcing the air to hit it's reynolds number, the TB should not be touched.
MB/Daimler ran a ton of compute resources on calculating the fluid dynamics of said TB on the engine. Bigger is not always better and that statement holds true for throttle bodies. See F1 and their tb size (usually in the 60/70mm range).
As long as the TB is not forcing the air to hit it's reynolds number, the TB should not be touched.
MB/Daimler ran a ton of compute resources on calculating the fluid dynamics of said TB on the engine. Bigger is not always better and that statement holds true for throttle bodies. See F1 and their tb size (usually in the 60/70mm range).
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Thread Starter
Member
Joined: Apr 2018
Posts: 91
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2009 SL63, 1999 E300 (462k miles and counting)
Thanks for the info.
As someone that 15 years ago was building 120hp/l NA motors and 518hp/l turbo motors for vintage euro cars I've got plenty of CFD and flowbench experience...
This is more experimentation to run on the flowbench and run some tests to see what happens.
But to satisfy the bench racers in the crowd. yes, I understand that velocity often matters more than total flow as laminar efficiency is of greater concern than just about anything else.
I also recognize that every system is a series of optimizations. CFO's and packaging and supply chains also have inputs on those optimization calculations. I'm just playing around with my daily to see what can be learned as I think the M156 is one of my favorite engines of all time.
As someone that 15 years ago was building 120hp/l NA motors and 518hp/l turbo motors for vintage euro cars I've got plenty of CFD and flowbench experience...
This is more experimentation to run on the flowbench and run some tests to see what happens.
But to satisfy the bench racers in the crowd. yes, I understand that velocity often matters more than total flow as laminar efficiency is of greater concern than just about anything else.
I also recognize that every system is a series of optimizations. CFO's and packaging and supply chains also have inputs on those optimization calculations. I'm just playing around with my daily to see what can be learned as I think the M156 is one of my favorite engines of all time.
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MBWorld Fanatic!
Joined: Dec 2005
Posts: 4,057
Likes: 341
From: NJ
2009 SL63 AMG
Could they work with modification? Perhaps. But I wouldn't assume they are plug 'n play.
M156-specific part number: 156-141-02-25
M113K-specific part number for the 03-06 SL55, which uses the 74mm TB: 113-141-06-25
M113K-specific part number for the 07-08 SL55, which uses an upgraded 80mm TB: 113-140-01-04
MBWorld Fanatic!
Joined: Dec 2005
Posts: 4,057
Likes: 341
From: NJ
2009 SL63 AMG
Why do you want a bigger throttle body? All that does is lose authority over the torque of the motor... read, ever see those mustang and chargers go completely out of control? Usually because they have a to big a tb and when they shut the throttle, to late, the engine still gulping lots of air and happy fish tailing we go!
As long as the TB is not forcing the air to hit it's reynolds number, the TB should not be touched.
MB/Daimler ran a ton of compute resources on calculating the fluid dynamics of said TB on the engine. Bigger is not always better and that statement holds true for throttle bodies. See F1 and their tb size (usually in the 60/70mm range).
As long as the TB is not forcing the air to hit it's reynolds number, the TB should not be touched.
MB/Daimler ran a ton of compute resources on calculating the fluid dynamics of said TB on the engine. Bigger is not always better and that statement holds true for throttle bodies. See F1 and their tb size (usually in the 60/70mm range).
While I tend to trust the factory more often than not, automatically assuming the factory got it right isn't realistic. Case in point, larger throttle bodies for the M156, which are a proven upgrade that have been on the market for many years now.
