Looking For An 80mm TB
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Joined: Aug 2018
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From: Seattle, WA
2019 M5 Comp, 2005 Ariel Atom 2
Looking For An 80mm TB
Does anyone have an 80mm throttle body laying around after going bigger? My car is one of the unlucky ones that just doesn't like the 82, and I don't want to pull the SC to port again for larger.
The talk and availability around these seemed to die when the 82 became popular, hoping someone has one collecting dust. Let me know!
The talk and availability around these seemed to die when the 82 became popular, hoping someone has one collecting dust. Let me know!
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CLS55 AMG
This is a bummer to hear and I fear I may be coming to the same conclusion. If I have to remove my 82mm (which is BRAND NEW OEM) I'll for sure be going with another brand new OEM 80mm. Yes it is expensive but I've had such a bad experience with used throttle bodies that the cost far outweighs the potential for headaches and time.
Thread Starter
Super Member
Joined: Aug 2018
Posts: 697
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From: Seattle, WA
2019 M5 Comp, 2005 Ariel Atom 2
This is a bummer to hear and I fear I may be coming to the same conclusion. If I have to remove my 82mm (which is BRAND NEW OEM) I'll for sure be going with another brand new OEM 80mm. Yes it is expensive but I've had such a bad experience with used throttle bodies that the cost far outweighs the potential for headaches and time.
Thread Starter
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Joined: Aug 2018
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From: Seattle, WA
2019 M5 Comp, 2005 Ariel Atom 2
I've combed through all of the 80mm threads (which are years old at this point) and can't find a definitive answer as most people where buying the SL snout too. I have the adapter for the 82, so if I find one I'll make it work somehow either modifying the adapter or tapping offset holes in my snout.
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From: San Diego
2004 E55
https://www.ebay.com/itm/Dodge-Chrys...-/123609570678
This is 80mm, and looks extremely similar to ours. Want to be a trail blazer and figure out if it works?
This is 80mm, and looks extremely similar to ours. Want to be a trail blazer and figure out if it works?
Thread Starter
Super Member
Joined: Aug 2018
Posts: 697
Likes: 172
From: Seattle, WA
2019 M5 Comp, 2005 Ariel Atom 2
https://www.ebay.com/itm/Dodge-Chrys...-/123609570678
This is 80mm, and looks extremely similar to ours. Want to be a trail blazer and figure out if it works?
This is 80mm, and looks extremely similar to ours. Want to be a trail blazer and figure out if it works?
It's coming in a week, so give me 2 to get it fabbed up!
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Thread Starter
Super Member
Joined: Aug 2018
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From: Seattle, WA
2019 M5 Comp, 2005 Ariel Atom 2
MBWorld Fanatic!
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2005 e55 AMG
Correct on there not being a hole. I drilled mine and cloned it to the factory throttle body. Also I never used an adapter....just oblonged the bolt holes on the throttle body and it worked perfect.
Mercedes 80mm's open in reverse so you will have to swap pins if you use it....real easy.
Mercedes 80mm's open in reverse so you will have to swap pins if you use it....real easy.
Thread Starter
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From: Seattle, WA
2019 M5 Comp, 2005 Ariel Atom 2
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E55 amg
Probably because it's really a 78, so I'm curious to see what a true 80 feels like. I definitely felt a difference with the 82 (when it was running right). Mostly I don't want my work porting the snout to go to waste haha, it just seems cruel to have done that and now run a stock TB. I'm pretty proud of my carbide cutting skills.
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CLS55 AMG
If (big if) the issue is that the 82mm is allowing for too much air to pass through when closed and the computer can't compensate, how would going to a larger throttlebody be any better?
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E55 amg
That's not true as many installs have leaks they don't think they have .The larger tb work great as it's tune related and i never had a missed beat with it..Tune is key along with proper installation .
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From: Seattle, WA
2019 M5 Comp, 2005 Ariel Atom 2
I know my post might seem misleading, but I don't think the issue is 100% based on there being too much air, just too much air for that specific throttle passage. I can confirm I had no install issues or leaks, simply going back to stock was enough but I has thoroughly 3-bonded the adapter plate, did smoke testing, carb spray etc and have not changed anything else. I also wonder if there are any mechanical differences between the N/A and forced induction TBs. The 80mm and Hellcat both are forced induction, the 82mm is off an N/A motor. All of this stuff would require a ton of side by side testing to verify, but I do find it quite interesting that the 82mm seems 'cursed', SO many people with issues yet a lot of those same people found a different size was just fine and I doubt they drastically changed their installation approach.
In another life when I managed an independent repair shop, we saw a lot of repairs but it was very rare a throttle body went bad. The 82s are bashed on because most people buy used, but it's such a rarity for them to fail I just can't wrap my mind around there being a ton of bad, Genuine Mercedes TBs floating around off of wrecked E550s etc. It seems more likely the velocity, airflow, and vacuum readings that size gives off is enough to trip the MAP and ECU settings on a lot of our cars, and I'm sure it drives some tuners crazy too since most tune for closed loop and this stuff is left to the factory manipulations.
In another life when I managed an independent repair shop, we saw a lot of repairs but it was very rare a throttle body went bad. The 82s are bashed on because most people buy used, but it's such a rarity for them to fail I just can't wrap my mind around there being a ton of bad, Genuine Mercedes TBs floating around off of wrecked E550s etc. It seems more likely the velocity, airflow, and vacuum readings that size gives off is enough to trip the MAP and ECU settings on a lot of our cars, and I'm sure it drives some tuners crazy too since most tune for closed loop and this stuff is left to the factory manipulations.
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CLS55 AMG
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if 74mm snout used then just break the plastic plug and route it there. thats how 80mm sl55 snout works. I bought it new
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From: Seattle, WA
2019 M5 Comp, 2005 Ariel Atom 2
The 80mm Jeep TB comes today, hoping to get it fabbed up and tested next week!
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From: Seattle, WA
2019 M5 Comp, 2005 Ariel Atom 2
Well no guinea pig work for me, that Jeep TB is basically the same as our stock TB, not sure why it was thought to be 80mm. Measures roughly 74mm, and the butterfly is even stamped with the same number as my stock one. Holes line up too. So I guess this is a cheap alternative for a stock TB. I'm only out $30 so I'll see if I can resell it.
BUT, I mentioned my earlier gripe about the stumble when the car wants the SC clutch to engage - Tony sent me a new map that completely got rid of it, so I'm a happy camper! Basically it's driving perfect now, especially with zerocat's latest TCU tune, so I'm not touching it anymore. I promise? Unless someone does come up with a good deal on a used 82mm and then maybe I'll do the switch, still looking.
BUT, I mentioned my earlier gripe about the stumble when the car wants the SC clutch to engage - Tony sent me a new map that completely got rid of it, so I'm a happy camper! Basically it's driving perfect now, especially with zerocat's latest TCU tune, so I'm not touching it anymore. I promise? Unless someone does come up with a good deal on a used 82mm and then maybe I'll do the switch, still looking.
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CLS55 AMG
Thread Starter
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Joined: Aug 2018
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From: Seattle, WA
2019 M5 Comp, 2005 Ariel Atom 2
Whatever Tony did, it had to do with the clutch engagement programming as my problem happened precisely when the ECM switched to 'engaged' on the SC clutch (even though I'm on a fixed pulley). I haven't logged again since the fix but have a suspicion I might not see the clutch as un-engaged as it was before. Or it had to do with bypass valve timing as I think that is what changes when the ECM thinks it's engaging the SC clutch.
