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'18 GLC 300 4MATIC AMG Line Night Pkg designo Nappa leather M274 Oil Solenoid mod Dinan Sport Tune
Stripped Air Box Fasteners
I found that the plastic had been stripped out of the intake air box base and the two T25 stock fasteners would just spin and not tighten down the lid leaving a slight gap. It appears that someone in the past was over zealous with a power tool...
I sourced some new screws from my local hardware shop, which had a coarser thread and were a bit longer. Then, I used a drill with a 1/8 inch bit to drill out the fastener hole all the way through the base. This way the longer screw could extend all the way through the base to bite into good plastic.
Very please with the outcome.
'18 GLC 300 4MATIC AMG Line Night Pkg designo Nappa leather M274 Oil Solenoid mod Dinan Sport Tune
Originally Posted by no_mulligan
What's with the duct tape?
With the air box located right above the exhaust and turbo, I noticed a lot of heat being transferred or soaked into those components despite the stock shielding on an M274 engine. At operating temperatures, I was shocked how hot the tube exiting the air cover was to the touch. It was surprisingly hot!
I added some aluminized fiberglass tape barrier directly to the bottom of the air box, under the existing heat shield. I wrapped aluminum tape to the inlet section to the air box and added heat shielding to the outlet tube, which are directly above the turbo to provide some heat reflection and protection.
From my uncalibrated touch, this has made a significant difference in temperature to those parts. So, I don't have measurable data or any test outcome validations, but my assumption is that with reduced heat retained in those parts, the air is picking up less heat from flowing through them. However, I don't know how much heat if any was originally being transferred. Yet, those parts are now definitely less hot to the touch and so in my mind, cooler air is now going into charge air cooler and then into the engine for better performance.
DYI heat shields on the air box and cover outlet tube
The stock heat shield placed back on the bottom of the air box
Last edited by scaryfast; Mar 25, 2024 at 04:08 PM.
Reason: wording
'18 GLC 300 4MATIC AMG Line Night Pkg designo Nappa leather M274 Oil Solenoid mod Dinan Sport Tune
Maybe
Originally Posted by mikapen
Nice. Looks like a very useful mod.
Did you notice any difference with the K&N?
No, I have not noticed any difference. Well, perhaps a bit more intake sounds. I do believe that the K&N filter allows better air flow, however, it's probably only doing a little better than an OE filter. So, it's possibly making a difference that I cannot feel in my seat, but every little bit counts.
I have not had any issues with the oiled filter as other's may have experienced.
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It appears that someone in the past was over zealous with a power tool...
