When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
We have turbos here from a 2020, a 2017 and a 2016. and have measured the comp and turbine wheels. There is no difference, so whoever said there is maybe needs to check again. There is a difference in the inlet manifolds though (not the airboxes). they are a lot smaller.
Not 100% sure TBH, something is limiting the power of FL vs PFL and it isn't the turbos...
Zac............ thank u.
Please tell me, when you drive the FL did you feel it didn't have the same rush as the older car? Because I'm telling you, the FACELIFT C63s does not feel like the PREFACELIFT. You can bash me all you want but there is no doubt about it. This and the faux engine noise is why I did not trade in and I was ready with cash............ I took the time to write a whole review thread on this and got flame grilled of course........... lol
The facelift just doesn't have that urgency to me. It's got power but it doesn't have that lunacy and crazy gut wrenching acceleration like the pfl!!!!! Especially in 3rd gear. It's how it felt to me and I want to know if you feel this too???.............
Please tell me, when you drive the FL did you feel it didn't have the same rush as the older car? Because I'm telling you, the FACELIFT C63s does not feel like the PREFACELIFT. You can bash me all you want but there is no doubt about it. This and the faux engine noise is why I did not trade in and I was ready with cash............ I took the time to write a whole review thread on this and got flame grilled of course........... lol
The facelift just doesn't have that urgency to me. It's got power but it doesn't have that lunacy and crazy gut wrenching acceleration like the pfl!!!!! Especially in 3rd gear. It's how it felt to me and I want to know if you feel this too???.............
There is a difference in the inlet manifolds though (not the airboxes). they are a lot smaller.
Whoa, good to know this 😮
Thanks for the info, Zac. Like everyone else, I also wonder why they did this. I mean, this must affect power if the facelift c63s inlets are much smaller, right?
Thanks for the info, Zac. Like everyone else, I also wonder why they did this. I mean, this must affect power if the facelift c63s inlets are much smaller, right?
The rear of the FL intake manifolds are a lot smaller. Without doing CFD on them (not happening, too complicated to draw) It looks to me like they are trying to increase throttle response at the expense of top end power. Speculation though.. I thought it may have been a packaging issue with the new engine mounts, but externally the mounts are the same.
They use the same manifold on the GLC and the motor mounts are different, so instead of making two different parts, they make one part for both cars...at least that's my theory.
They use the same manifold on the GLC and the motor mounts are different, so instead of making two different parts, they make one part for both cars...at least that's my theory.
The rear of the FL intake manifolds are a lot smaller. Without doing CFD on them (not happening, too complicated to draw) It looks to me like they are trying to increase throttle response at the expense of top end power. Speculation though.. I thought it may have been a packaging issue with the new engine mounts, but externally the mounts are the same.
Searched through EPC and part numbers are also different for FL and PFL.
Here are two photos I have from looking around last night. Is this what you're explaining? Ones got a noticeably bigger chamber and the other is skinnier?
Apart from being left and right examples, these are the correct intake manifolds for PFL & FL yes?
Last edited by Jimmy_c63s; 09-09-2020 at 10:53 PM.
Searched through EPC and part numbers are also different for FL and PFL.
Here are two photos I have from looking around last night. Is this what you're explaining? Ones got a noticeably bigger chamber and the other is skinnier?
Apart from being left and right examples, these are the correct intake manifolds for PFL & FL yes?
Yep I had a better pic but can't seem to find it.@RDO247 can chime in?
The rear of the FL intake manifolds are a lot smaller. Without doing CFD on them (not happening, too complicated to draw) It looks to me like they are trying to increase throttle response at the expense of top end power. Speculation though.. I thought it may have been a packaging issue with the new engine mounts, but externally the mounts are the same.
So how does the affect something like doing a turbo upgrade? Been thinking about doing pure turbos on mine but I dont really want to until the differences are fully understood.
So how does the affect something like doing a turbo upgrade? Been thinking about doing pure turbos on mine but I dont really want to until the differences are fully understood.
I think what he’s saying is that without measuring the CFM flow of the PFL and the FL intake manifolds, there’s no way to determine if there’s any difference in performance with the smaller/thinner looking PFL intake manifolds.
Generally speaking, for FI applications, you want more plenum volume that can be evenly distributed to each cylinder - so if the PFL intake manifold do indeed flow more CFM, it would make them better suited for high flow/horsepower applications over the FL design.
It’s possible that AMG had to redesign the intake manifolds for the FL C63 and GLC (they appear to be the same), because of the 9-speed MCT transmission. The 7-speed more than likely allowed for more room for larger intake plenums.
There's already a long thread on this from last year. Have fun reading it. Don't remember quite what the ultimately conclusion was, but it's essentially irrelevant if even correct. Size matters for response. Smaller turbos are more responsive. The main question is are they efficient for the rated power and that they are. The FL has generally been faster than the PFL, partly because of the transmission as well. Tuning is a different story and if done right requires upgraded turbos anyway. The stock turbos even in the PFL simply can't handle more top end. Most tunes only add more low to mid range torque and power instead of adding more power at the top where you really want it. You need to upgrade the turbos to handle more power at the top. Look at CarBahn's tune with upgraded turbos.
09-07-2020, 07:49 PM
