need definitive answers on 82mm TB upgrade on 03 E55
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Joined: Jan 2006
Posts: 607
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From: South Florida
W220 V12TT Land Yacht / W211 E55 Estate
need definitive answers on 82mm TB upgrade on 03 E55
I have a local guy that is giving me a great buy on an 82mm throttle body.
P/N: A2731410325
After researching Ad nauseam on this forum researching this mod, I have found so much misinformation/conflicting information from an 80mm throttle body is actually 78mm and a 82mm TB is really 80mm; intake pipe for a 82mm throttle body is actually 80mm, etc.
I just wanted to get this ironed out before I purchase all the parts and move forward with this mod.
1. I am reading that the 82mm throttle body is the only MB throttle body upgrade which don't require any rewiring. I have read that the 80mm TBs open in a reverse way that requires rewiring. Not really interested in that aspect of an install, so I would like to avoid that. A reflash is one thing, but rewiring is not something I want to do.
2. What parts do I need to actually replace? Intake "y" pipe, throttle body, 82mm TB gasket, and 82mm blower inlet section? Again, not interested in hacking up mine and welding in an adapter plate. I would rather just buy a bolt-on part.
so far I have found these P/N:
1. 82mm bolt on tb: A2731410325 - should be 100% PnP with exception of retune
2. 82mm or 80mm "y" pipe: ???????
3. 82mm TB gasket: ???????
4. 82mm supercharger inlet section: ?????
any other parts that I am totally forgetting? Looking to do this mod this week.
thank you.
P/N: A2731410325
After researching Ad nauseam on this forum researching this mod, I have found so much misinformation/conflicting information from an 80mm throttle body is actually 78mm and a 82mm TB is really 80mm; intake pipe for a 82mm throttle body is actually 80mm, etc.
I just wanted to get this ironed out before I purchase all the parts and move forward with this mod.
1. I am reading that the 82mm throttle body is the only MB throttle body upgrade which don't require any rewiring. I have read that the 80mm TBs open in a reverse way that requires rewiring. Not really interested in that aspect of an install, so I would like to avoid that. A reflash is one thing, but rewiring is not something I want to do.
2. What parts do I need to actually replace? Intake "y" pipe, throttle body, 82mm TB gasket, and 82mm blower inlet section? Again, not interested in hacking up mine and welding in an adapter plate. I would rather just buy a bolt-on part.
so far I have found these P/N:
1. 82mm bolt on tb: A2731410325 - should be 100% PnP with exception of retune
2. 82mm or 80mm "y" pipe: ???????
3. 82mm TB gasket: ???????
4. 82mm supercharger inlet section: ?????
any other parts that I am totally forgetting? Looking to do this mod this week.
thank you.
Thread Starter
Super Member
Joined: Jan 2006
Posts: 607
Likes: 8
From: South Florida
W220 V12TT Land Yacht / W211 E55 Estate
Super Member
Joined: Jul 2010
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From: Kansas
2003 E55, 2003 SL55, 2014 CLS63, 2018 q50 Redsport, 1968 Camaro SS, 1999 Trans am Firehawk
you can do a 80mm tb with an unmodified sc inlet from a late year SL (those came from the factory with an 80mm tb), but for an 82mm you have to have a modified sc inlet no matter what.
Thread Starter
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Joined: Jan 2006
Posts: 607
Likes: 8
From: South Florida
W220 V12TT Land Yacht / W211 E55 Estate
my friend definitely has the 82mm TB, so what exactly do I have to do to sc inlet to make it fit? Do I need to start with the 80mm inlet part, or just use the stock e55 74mm s/c inlet?
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Thread Starter
Super Member
Joined: Jan 2006
Posts: 607
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From: South Florida
W220 V12TT Land Yacht / W211 E55 Estate
the plate would have to be welded to the stock plenum and obviously bored to the 82mm, I would assume. I was reading that the addition of the plate really pushes the TB back and causes some issues with the mounting of the y-pipe. I will contact him. Thanks.
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From: Usa
mgLipGD
It will certainly push it back some. I had a stock plenum bored out and drilled so I could keep my carbon Renntech box.
Thread Starter
Super Member
Joined: Jan 2006
Posts: 607
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From: South Florida
W220 V12TT Land Yacht / W211 E55 Estate
Thread Starter
Super Member
Joined: Jan 2006
Posts: 607
Likes: 8
From: South Florida
W220 V12TT Land Yacht / W211 E55 Estate
is it any more or less work to start out with a 74 vs an 80? is the tb mounting bolt placement an issue with either one?
Last edited by m3j0n; Mar 14, 2015 at 12:52 PM.
MBWorld Fanatic!
Joined: Dec 2011
Posts: 4,599
Likes: 102
From: Florida
A Merc
MBWorld Fanatic!
Joined: Dec 2011
Posts: 4,599
Likes: 102
From: Florida
A Merc
Thread Starter
Super Member
Joined: Jan 2006
Posts: 607
Likes: 8
From: South Florida
W220 V12TT Land Yacht / W211 E55 Estate
MBWorld Fanatic!
Joined: Nov 2007
Posts: 3,681
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From: San Diego
E55
Good info, Since the SL55 with same m113k motor already has 80mm throttle body stock. Wouldn't a 90mm be a better upgrade? Skipping the 80 and 82mm entirely..
But, you would definitely need long tube headers to increase exhaust flow to accommodate to that large of volume of air entering the motor. Without choking and raising IAT's…. But, given that. I think 90mm would be the way. Anyone have thoughts on this?
As reference the supercharged cobras pickup a ton of power by going 90 even 100mm on throttle bodies.
But, you would definitely need long tube headers to increase exhaust flow to accommodate to that large of volume of air entering the motor. Without choking and raising IAT's…. But, given that. I think 90mm would be the way. Anyone have thoughts on this?
As reference the supercharged cobras pickup a ton of power by going 90 even 100mm on throttle bodies.
Last edited by Max.H; Mar 14, 2015 at 05:16 PM.
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From: Florida
A Merc
90 is a different ball game. You need someone to really work on the plenum and then work on the intake. Also want to point out the 90mm are somewhat problematic, go on the dodge forums and many have issues at one time or another and have to exchange them.
