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DIY: 82mm throttle body
#1
Senior Member
Thread Starter
DIY: 82mm throttle body
This has been discussed quite a few times, I know. Just thought I'd share my experiences as well. There are probably easier ways to accomplish this task, but I made the most of what I had and it all worked out pretty well.
Fitment is perfect. Idle is perfect.
82mm throttle body straight from Mercedes. This is $800 in a box:
![](https://lh6.ggpht.com/_lbtYMre2TDo/TBbb15FUq5I/AAAAAAAAFJY/udJdiPJR5VQ/s800/IMG_2512.JPG)
Nobody seems to want to share the part number with the world. I think that's just silly:
![](https://lh3.ggpht.com/_lbtYMre2TDo/TBbb2juW4oI/AAAAAAAAFJc/Z9XPNnY3hfw/s800/IMG_2513.JPG)
I found a hunk of 1/2" thick aluminum plate and started making the adapter plate needed to fit onto the stock supercharger snout:
![](https://lh3.ggpht.com/_lbtYMre2TDo/TBbb3lxqmvI/AAAAAAAAFJg/R6iFBBhG5Kw/s800/IMG_2514.JPG)
Using a hole-saw, I cut the throttle body inlet hole undersized, just to remove most of the meat:
![](https://lh3.ggpht.com/_lbtYMre2TDo/TBbb4hPWT0I/AAAAAAAAFJo/ZP9w32bUvNs/s800/IMG_2517.JPG)
Then used a boring bar to bore the hole to size:
![](https://lh4.ggpht.com/_lbtYMre2TDo/TBbb8MTN8NI/AAAAAAAAFOw/ZrbZW51UpZI/s800/IMG_2521.JPG)
Here's the finished product with holes drilled and tapped:
![](https://lh5.ggpht.com/_lbtYMre2TDo/TBbb_RsBejI/AAAAAAAAFKM/8YwD5jP-Ces/s800/IMG_2526.JPG)
Here's the stock supercharger snout. I cleaned it up a little and removed all the miscellaneous fittings and other fun-buttons:
![](https://lh5.ggpht.com/_lbtYMre2TDo/TBbb9YuN_jI/AAAAAAAAFKA/D6oCvvyP06w/s800/IMG_2523.JPG)
A good visual to see what 74mm looks like compared to 82mm:
![](https://lh4.ggpht.com/_lbtYMre2TDo/TBbb-IAV_BI/AAAAAAAAFKE/HHZZe6EHQyQ/s800/IMG_2524.JPG)
I made a little jig to hold the snout at the right angle and got busy with the boring bar again. Indexable carbide cutters rule:
![](https://lh6.ggpht.com/_lbtYMre2TDo/TBbcAplpXDI/AAAAAAAAFPI/zFF4suOXBRo/s800/IMG_2528.JPG)
![](https://lh4.ggpht.com/_lbtYMre2TDo/TBbb_zwqPKI/AAAAAAAAFPE/7F-slhPQGaA/s800/IMG_2527.JPG)
Tack welded onto the newly bored supercharger snout:
![](https://lh3.ggpht.com/_lbtYMre2TDo/TBbcD_UNabI/AAAAAAAAFKk/faUfZlcqmEs/s800/IMG_2532.JPG)
All done:
![](https://lh4.ggpht.com/_lbtYMre2TDo/TBbcEtxrFDI/AAAAAAAAFKo/zRH-OT3BUCM/s800/IMG_2533.JPG)
![](https://lh6.ggpht.com/_lbtYMre2TDo/TBbcEwec7KI/AAAAAAAAFKs/gNFyjqUPZ0Y/s800/IMG_2534.JPG)
I didn't have any baseline numbers to do a before/after comparison...plus, my engine setup is completely different from before so I don't have much to compare to as well. Anything that helps the engine breathe better is a good thing.
Enjoy!
Fitment is perfect. Idle is perfect.
82mm throttle body straight from Mercedes. This is $800 in a box:
Nobody seems to want to share the part number with the world. I think that's just silly:
I found a hunk of 1/2" thick aluminum plate and started making the adapter plate needed to fit onto the stock supercharger snout:
Using a hole-saw, I cut the throttle body inlet hole undersized, just to remove most of the meat:
Then used a boring bar to bore the hole to size:
Here's the finished product with holes drilled and tapped:
Here's the stock supercharger snout. I cleaned it up a little and removed all the miscellaneous fittings and other fun-buttons:
A good visual to see what 74mm looks like compared to 82mm:
I made a little jig to hold the snout at the right angle and got busy with the boring bar again. Indexable carbide cutters rule:
Tack welded onto the newly bored supercharger snout:
All done:
I didn't have any baseline numbers to do a before/after comparison...plus, my engine setup is completely different from before so I don't have much to compare to as well. Anything that helps the engine breathe better is a good thing.
Enjoy!
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#8
MBWorld Fanatic!
The shop that did my set up did the same thing. Except for the welding the adapter plate to the SC inlet, I asked them to use the counter sink screws to screw into the stock holes. That way I can easily reverse back to stock (this when I still have warranty).
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bobgodd (02-22-2024)
#9
MBWorld Fanatic!
Nice tools!
BTW is this TB plug and play any rewiring needed?
BTW is this TB plug and play any rewiring needed?
Last edited by stevebez; 09-22-2010 at 12:13 PM.
#14
Super Member
I was just going to say the same thing. Damn. Reminds me of a quote from Fast Times at Ridgemont High...
"Relax, all right? My old man is a television repairman, he's got this ultimate set of tools. I can fix it. "
"Relax, all right? My old man is a television repairman, he's got this ultimate set of tools. I can fix it. "
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kgoff6 (09-02-2016)
#24
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