SICAMG

Great to hear my friend. My 80 has been solid for a couple years now as well.

redc36

@GinDistiller @SICAMG

Hey guys, can you help me understand this 80mm (78) TB install.
Excluding the early 2000s 80mm TBs from V12 as well as some euro cars our options in USA are
2007/2008 SL55 80mm tb A1131400104
2005+ CL600 s65 s600 80mm tb..... A2751410625

Q1. Since they are both 80mm does Cl600 style bolt up fully to 113 140 09 12 (its not e55 snout) sl55 80mm snout. SL55 TB obviously will since its made for it.
Q2. Some CL600 style TBs come with the wiring harness and some dont. If you get the one without the harness, does the 1131500028 throttle cable work?
a: IF 1131500028 works, do you still need to swap the pins?
Q3. Since both Sl55 tb and CL600 style TBs have the butterfly opening the other way, I am assuming they both require pin swap to work properly.
a. Is the pin swap the same on sl55 and cl600? I believe Sl55 is 1-4 and 5-6 or CL600 requires a different swap.
Q4. AMG sl55 tb has a thick rubber cap over electronics vs cl600 style usually is slimmer with a plastic side. Whats the purpose of that rubber? Do m113ks need that?
Q5. Does anyone make adapter for 80mm snout (09 12) to add 82mm TB (which wont require pin swap as i understand).

thank you so much

GinDistiller

I'll do my best!
Q1. I don't think so...I tried to google pictures of the SL throttle body and they look like the holes are evenly spaced, the other one has two holes that are closer together and two that are 'normal' distance apart, hence why I had to only use two bolts to secure mine. I don't remember the snout part #, but if you search that and the holes look evenly spaced like our stock TB, then it's safe to assume the TB mounting points are different between the two.
Q2. Yes, connectors are the same so go with whichever one you find. Mine came without and I used the extender.
Q3. Yes, pin swap is required and is the same on both TBs.
Q4. Heat protection, but I honestly wouldn't worry about it. In fact most mountings put the TB slightly rotated up which gives more breathing room to the motor anyway. Those other engines produce a lot heat too, I think that cap was just some over-engineering for the M113K motors, a lot of us run without it with no issue.
Q5. No. I looked high and low and the only adapter on the market is for the 82mm to mount to the stock snout, so any other combination needs to be a custom job. I think you'd need to drill out and widen the SL snout anyway to fit the larger 82 TB (which I'd recommend against anyway after all of the problems they have caused some people), so don't waste money buying that snout just to cut it up when you could do that to your stock snout for free.

Hope this helps!

RaceProfessor

Any documented power increases besides seat of the pants?

GinDistiller

I haven't personally done back-to-back dyno testing but back when these were becoming popular I think there may have been a few, you'd have to search though. Things like intake spacers are debatable, but increasing the inlet size of the air passage into the engine will always produce the potential for more power. It's less about the marginal power increase for me and more about drivability, the tip-in throttle response is much improved by a larger throttle body. We make a ton of power as it is, but better response makes that power more enjoyable.

lost27

@RaceProfessor you could always take a look at my CLS build thread, lots of before/after dynos there. I am not currently running an 80mm (yet, the damn 82 is such a PITA) but I do have a dyno of what the 82mm TB can yield but YMMV. Don't even give the 82mm a thought though, my car has been in the shop for almost a year on and off at this point trying to address the hiccup.

RaceProfessor

I run a 92mm, I know the pain. lol

lost27

I thought that the VTech tunes didn't have the hiccup issue.

RaceProfessor

it's not horrible, light throttle acceleration just bucks a bit while we're trying to fine tune it. I'm just still chasing check engine lights, smoke tested it multiple times and couldn't find a leak and still getting unmetered air codes. Driving me nuts.

E55Greasemonkey

From stock to 82mm I gained 25whp on the dyno and .1 in the 1/4 mile.

VictoryRoadPerformance

Customer Tuned by Jerry at EC picked up 41 WHP going from an 82mm to a 92mm

E55Greasemonkey

What's with the weird power curves?

VictoryRoadPerformance

we werent involved in the dyno testing or the tuning, so not sure, those are just the results the customer shared.