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How to retro-fit skid trays, aerodynamic under trays, & stone guards to a MK7 Golf

quailallstar

WOB DJ496
Location
Ormond Beach, FL
Ride
MY19 MK7.5 GTI Bunny
I performed these modifications on my MK7 2016 Golf Wagon. Now I've recently purchased a MK7.5 2019 GTI and will do the same. Any tips that are GTI specific?
 

B3mt1

New member
Location
Croatia
Hi guys,

Done this modification and I have decided to measure the difference before and after.

I own 2.0TDI so I already have front aerodynamic skid tray and that is why there is not a big difference when we are talking about numbers. Also, measurement is still in progress as you can see from the the numbers I don't have same sample size as before.

Here below you can find results

120 km/h --> 59 dbA, 71.3 dbZ (OEM, 14 samples); 58.4 dbA, 70.8 dbZ (modification, 6 samples)
130 km/h --> 60.5 dbA, 72.1 dbZ (OEM, 15 samples); 59.4 dbA, 71 dbZ (modification, 8 samples)
140 km/h --> 61.5 dbA, 73 dbZ (OEM, 17 samples); 61.1 dbA, 72.6 dbZ (modification, 6 samples)


 

golfdave

Drag Racing Champion
Location
Scotland (U.K.)
Ride
MK7 Golf GT Estate
I performed these modifications on my MK7 2016 Golf Wagon. Now I've recently purchased a MK7.5 2019 GTI and will do the same. Any tips that are GTI specific?
The rear axle cover from the Passat will not fit & you require the older short axle cover from the MK5/6......that's it...

I take it the wagon was the "R"??..if so you can now fit the front section exhaust tunnel tray to the GTI..below the gearstick area...AWD gets in the way & doesn't have the bracket unless you retrofitted it to the wagon..
 

AWD44161

New member
Location
Texas
Hey Golfdave

Back in the first page you mentioned going up to 52 MPGs on a trip. I’m assuming that’s British MPGs, any update on average consumption on long trips?

My MK6 Jetta averaged 35 MPGs (USA), my MK7.5 GTI probably averages 31 on ECO drive mode so any gains would be awesome. Do you recommend a specific set of plates for my MK7.5 GTI or just do the whole thing?
 

golfdave

Drag Racing Champion
Location
Scotland (U.K.)
Ride
MK7 Golf GT Estate
Hey Golfdave

Back in the first page you mentioned going up to 52 MPGs on a trip. I’m assuming that’s British MPGs, any update on average consumption on long trips?

My MK6 Jetta averaged 35 MPGs (USA), my MK7.5 GTI probably averages 31 on ECO drive mode so any gains would be awesome. Do you recommend a specific set of plates for my MK7.5 GTI or just do the whole thing?
that was UK MPG.....& even on standard roads & not "Eco" long distance roads/trips I get 44 to 48MPG.....

I'm working on another mod undertray...but it might be affected by what is used under the MK8 Golf....& this would affect any full engine bay aero tray..

....The rear short axle MK6 golf for your car & also fit the front exhaust tunnel cover if not fitted...are not affected by the above...so safe to fit....
 

Sc629

Ready to race!
Location
IN
Looks like HumbleMechanic on YouTube may have been around here. Impressive the durability of the oem skid plate (strength testing near end of video).
 

golfdave

Drag Racing Champion
Location
Scotland (U.K.)
Ride
MK7 Golf GT Estate
Looks like HumbleMechanic on YouTube may have been around here. Impressive the durability of the oem skid plate (strength testing near end of video).
That plate appears to flex.. mine feels as solid as a rock!!….mind you placing it flat & running over it is not testing it as it is mounted...he needs to support it under the main bolt holes on blocks then stand on it/or run over..I think in another thread there is a picture of two big blokes standing on one with it supported between two sets of bricks...
 

Skeej

Passed Driver's Ed
Location
Usa
That plate appears to flex.. mine feels as solid as a rock!!….mind you placing it flat & running over it is not testing it as it is mounted...he needs to support it under the main bolt holes on blocks then stand on it/or run over..I think in another thread there is a picture of two big blokes standing on one with it supported between two sets of bricks...
i agree- the OEM Alltrack "plati-steel"-like engine skid tray is very solid- and good to go as is, as an upgrade to the shorter thinner plastic-only and thus flimsier under engine aero panels on GSWs, GTIs.

You can also replace that sturdier AT engine skid plate with ECS aluminum skid plate which (golfdave originally scoffed at, but...)
now has a front reinforcing bar that adds more strength IMHO than OEM AT plate in two key areas:
A. Two bolts into the bar at leading edge of tray, that in addition to the alum tabs slotting into the front spoiler, which like the plasti- steel tans on OEM plate
Serve to add extra hold of the bar for front edge of aluminum skid plate from bending up, on an impact.
B. Bar bolts into core on the ends with two bolts replacing two OEM stamped metal brackets with only one bolt that attach the front corners of OEM plasti-steel plate.

You can also add the ECS tunnel skid plate as I did (which protects nothing on an MT, but continues the flat area further aft and is claimed to stiffen the body).

YMMV but its worth it to me for peace of mind, as an aftermarket aluminum metal engine skid plate on an older VW tdi saved me many times...
and I am fairly certain this setup saved me again only two weeks after install when I got hogbacked in a gravel wash out in the desert...🤣

...two hours of jacking with the itty bitty factory jack, digging out underneath with my trusty folding USA trenching tool...in 110degree heat, and

stacking rocks, wood under wheels to drive off on a firm surface, baja recovery style, and all I had was scratches on the skid plates, dirt all over me, and wounded pride 🤣

PS: I am safety oriented so I replaced plastic oil pan with a steel one plus mag drain plug...also ECS.

Two oil changes later after more bumpy roads, including same road as before, plus a whifferdill thru an interstate median swale on a u-turn thru some tall grass...that *may* have contributed to that itty bitty silver piece on lower edge of front grill popping off, last seen pin-wheeling thru the air in rear view mirror over UTAH vibration strips on I-15...

(i digress, another story...)

tldr the skid plates are holding up, worth every penny for peace of mind!
 

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golfdave

Drag Racing Champion
Location
Scotland (U.K.)
Ride
MK7 Golf GT Estate
i agree- the OEM Alltrack "plati-steel"-like engine skid tray is very solid- and good to go as is, as an upgrade to the shorter thinner plastic-only and thus flimsier under engine aero panels on GSWs, GTIs.

You can also replace that sturdier AT engine skid plate with ECS aluminum skid plate which (golfdave originally scoffed at, but...)
now has a front reinforcing bar that adds more strength IMHO than OEM AT plate in two key areas:
A. Two bolts into the bar at leading edge of tray, that in addition to the alum tabs slotting into the front spoiler, which like the plasti- steel tans on OEM plate
Serve to add extra hold of the bar for front edge of aluminum skid plate from bending up, on an impact.
B. Bar bolts into core on the ends with two bolts replacing two OEM stamped metal brackets with only one bolt that attach the front corners of OEM plasti-steel plate.
I find it funny ;)..that ECS made the bar & additional mounting brackets way after I complained on here about their skid tray!...There is still a slight problem with theirs...& that is the gapping holes at the front where the brackets are...so not that good for aero compared to the VW skid tray.
 

Skeej

Passed Driver's Ed
Location
Usa
I find it funny ;)..that ECS made the bar & additional mounting brackets way after I complained on here about their skid tray!...There is still a slight problem with theirs...& that is the gapping holes at the front where the brackets are...so not that good for aero compared to the VW skid tray.
Yes I noted that too. Perhaps your observations and a couple others about the metal skid plate haveing potential for bending up into engine spurred the addition of bar.
Having run both the oem skid and the ecs engine skid over a couple rocks they seem to be equally sturdy, with a slight advantage to the metal plate for the mounting point items I mentioned.

Are you referring to the two rectangular cut out holes (see pic below- cooling for DSG?)?

If so I thought about your observations and note they have tabs bent slightly in that a guy could hammer flat and seal with say duct tape- not very elegant but keep water and gravel getting forced up in there IF one were fording a lot of streams...really

I decided NOT to as I notice the engine compartment gets pretty hot as is in SoCal desert camping so that bit of airflow makes up for some lost putting on tunnel skid.

7919AA9A-E256-4AEB-BC23-B1E0CBDA798D.jpeg
 
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Skeej

Passed Driver's Ed
Location
Usa
Yes I noted that too. Perhaps your observations and a couple others about the metal skid plate haveing potential for bending up into engine spurred the addition of bar.
Having run both the oem skid and the ecs engine skid over a couple rocks they seem to be equally sturdy, with a slight advantage to the metal plate for the mounting point items I mentioned.

Are you referring to the two rectangular cut out holes (see pic below- cooling for DSG?)?

If so I thought about your observations and note they have tabs bent slightly in that a guy could hammer flat and seal with say duct tape- not very elegant but keep water and gravel getting forced up in theirif one were-fording streams...

I decided NOT to as I notice the engine compartment gets pretty hot as is in SoCal desert camping so that bit of airflow makes up for some lost putting on tunnel skid.

View attachment 161628
Now Dave what we Alltrack guys REALLY need is a way to better protect those vulnerable gas tanks...they hang so low that metal plates added on would decrease ground clearance...and cant see handy bracket mounts points either.
E618BB15-CF30-42F2-ADAD-E132A429E774.jpeg
E618BB15-CF30-42F2-ADAD-E132A429E774.jpeg

Question: has VW Europe got anything new in plastic aero trays since you put this guide together years ago? I read the whole thing then but that was missing and unlikely to be added, back then as I recall... for now I just take a line that puts the sharpest tallest rock dead center to hit the engine and tunnel skid, vs bounce off lower control arms and gas tanks...
Already running max 27" tires - max fit without rubbing.
next is a 1" lift and thats about all we can do, short of cutting fenders and running even bigger tires...🤣 but if I recall DAP maxed out at 27.5"dia on their RallyTrack just barely clearing the shocks, so no MonsterTruck AllTracks...
 
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golfdave

Drag Racing Champion
Location
Scotland (U.K.)
Ride
MK7 Golf GT Estate
Are you referring to the two rectangular cut out holes (see pic below- cooling for DSG?)?
NO.....I am referring to the fact I can see the horizontal reinforcing bar behind the skid tray...its the big holes in the ECS tray where on the VW tray is has the front brackets pairs of bolt holes...

& VW has not made anything for the rear..& nothing changes in Europe or anywhere for the last MK7.5.....

MK8 is a different story.....as it uses the aluminium front subframe from the Audi A3....


& I have a write up to finish for the front subframe cover...(Tiguan)....which works but requires drilling holes in the subframe
 

Skeej

Passed Driver's Ed
Location
Usa
"

VW has not made anything for the rear..& nothing changes in Europe or anywhere for the last MK7.5....."

Thanks,Dave
 

golfdave

Drag Racing Champion
Location
Scotland (U.K.)
Ride
MK7 Golf GT Estate
"

VW has not made anything for the rear..& nothing changes in Europe or anywhere for the last MK7.5....."

Thanks,Dave
But I did a new guide using the Tiguan front subframe cover....which may, or may not be replaced by whatever the MK8 Golf has.....;)
 

2019GolfR

New member
Location
Nashville, TN
Hello all,

I want to thank everyone for so much detailed information about the skid trays, etc. This is an exhausting amount of information. Since so much has changed over the past few years with part numbers, etc. I want to make 100% sure I am ordering the right thing for my 2019 Golf R 6 mt transmission. I want the OEM skid tray (the thicker one) and all supporting hardware that is required. I see that ECS and FCP Euro offer them in a kit. But, their prices are pretty high. Is there a way for me to order what I need and shipped to me here in the US cheaper? Could someone verify the correct part numbers that I will need for my 2019 Golf R 6 mt?

Are these correct for my 2019 R 6 mt?

I was also considering the cheaper AERO option rather than the GRP option. Is something like the AERO better than not having anything at all aside from the OEM splash guard that doesn't even cover the pan?

Item No. 23:- 3Q0 825 902, Underrun bar (Skid tray), $282.48***
Item No. 27:- N 0195 307, Hex head bolt , $ (x2)***(easier to fit this bolt in tight space but the one above is the correct VW one)
 
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golfdave

Drag Racing Champion
Location
Scotland (U.K.)
Ride
MK7 Golf GT Estate
Hello all,

I want to thank everyone for so much detailed information about the skid trays, etc. This is an exhausting amount of information. Since so much has changed over the past few years with part numbers, etc. I want to make 100% sure I am ordering the right thing for my 2019 Golf R 6 mt transmission. I want the OEM skid tray (the thicker one) and all supporting hardware that is required. I see that ECS and FCP Euro offer them in a kit. But, their prices are pretty high. Is there a way for me to order what I need and shipped to me here in the US cheaper? Could someone verify the correct part numbers that I will need for my 2019 Golf R 6 mt?

Are these correct for my 2019 R 6 mt?

I was also considering the cheaper AERO option rather than the GRP option. Is something like the AERO better than not having anything at all aside from the OEM splash guard that doesn't even cover the pan?

Item No. 23:- 3Q0 825 902, Underrun bar (Skid tray), $282.48***
Item No. 27:- N 0195 307, Hex head bolt , $ (x2)***(easier to fit this bolt in tight space but the one above is the correct VW one)
The thicker reinforced GRP (also has Kevlar/aramid in it) is very tough, & the more expensive option......the thin plastic aero tray is known as "diesel noise insulation", as it is usually fitted to diesel cars to make them quieter...take your pick...

The only other trays you can fit is the short front exhaust tunnel tray (not shown but mentioned)

For short cover (GTE & 4WD):-
Item No.14:- 5Q0 825 230 J
, Lining (cover) short length, £??.?? (x1)
Item No.15:- N 038 549 4, Black plastic push rivet A04A, £0.18 (x2) (Use these ones for the most secure fit, October 2018 EDIT)
Item No.16:- N909 747 01, Black wide head T-star screw A04B, £0.17 (x2)
 

2019GolfR

New member
Location
Nashville, TN
The thicker reinforced GRP (also has Kevlar/aramid in it) is very tough, & the more expensive option......the thin plastic aero tray is known as "diesel noise insulation", as it is usually fitted to diesel cars to make them quieter...take your pick...

The only other trays you can fit is the short front exhaust tunnel tray (not shown but mentioned)

For short cover (GTE & 4WD):-
Item No.14:- 5Q0 825 230 J
, Lining (cover) short length, £??.?? (x1)
Item No.15:- N 038 549 4, Black plastic push rivet A04A, £0.18 (x2) (Use these ones for the most secure fit, October 2018 EDIT)
Item No.16:- N909 747 01, Black wide head T-star screw A04B, £0.17 (x2)
Hey GolfDave, thanks for the reply. Can you confirm that 3Q0825902B will work on my 19 R? I found a wholesale dealer selling it for a good price. When I search this part on ECS tuning it does show that it has a duct for cooling unlike what was stated before about the version without this duct. Any thoughts?
 

golfdave

Drag Racing Champion
Location
Scotland (U.K.)
Ride
MK7 Golf GT Estate
Hey GolfDave, thanks for the reply. Can you confirm that 3Q0825902B will work on my 19 R? I found a wholesale dealer selling it for a good price. When I search this part on ECS tuning it does show that it has a duct for cooling unlike what was stated before about the version without this duct. Any thoughts?
I added the above number to my first post....& the item which was stated as having NO ducts started 5Q0...& that description is correct for number...

The item 3Q0825902B states for Alltrack..& has one duct & is the reinforced skid tray..& will fit your Golf...remember to the two brackets & the two bolts for the brackets & the seven bolts for the tray to the brackets...
 

2019GolfR

New member
Location
Nashville, TN
I added the above number to my first post....& the item which was stated as having NO ducts started 5Q0...& that description is correct for number...

The item 3Q0825902B states for Alltrack..& has one duct & is the reinforced skid tray..& will fit your Golf...remember to the two brackets & the two bolts for the brackets & the seven bolts for the tray to the brackets...
Dave, thanks again! I ordered the parts substantially cheaper than FCP Euro and ECS Tuning from a wholesale wv parts dealer. Once I receive my parts I will share where I got them from in case us boys in the US want to place a similar order. It was free shipping and no tax as well, which is a big deal. Saved me about $80 US off the total price. I appreciate your quick responses and your wealth of knowledge! Cheers!
 

Daner

Passed Driver's Ed
Location
Stockholm
I had the OEM aero-bits installed on my 2017 Golf Sportscombi/Variant/Estate/Sportswagen upon delivery in August 2016. (Most recently posted here: https://golfmk7.com/forums/index.php?threads/how-to-retro-fit-skid-trays-aerodynamic-under-trays-stone-guards-to-a-mk7-golf.320687/post-6659942)
My car is a Swedish-spec GT with DCC, so the suspension, brakes, and ride height match the non-PP GTI. The engine is the 1.4l TSI, 150hp, with a 6-speed manual. I fill it with the highest octane fuel that is available locally (Shell V-Power, aka Nitro in other places, >98 octane) to get a bit of extra power without the need for mechanical or electronic enhancement.

Since taking delivery we have driven just over 70 000 km (43 500 miles) using just over 4521 liters (1194 US gallons, 994 UK gallons) of fuel. Our average fuel economy is 6.48 liters per 100 km (36.3 US MPG, 43.6 UK MPG). I am very pleased with the highway economy in particular. One one day last summer I drove 287 mostly highway km including extended cruising at about 140 km/h (87 MPH) while burning only 16.94 liters of fuel, which worked out to 5.9 liters per 100 km (39.8 US MPG, 47.8 UK MPG).

As the aero-bits have been mounted since day one I can make no A/B comparisons regarding relative fuel economy, noise levels, stability at speed, or top speed, but I would like to think that having them does some good in all of those respects. I can report that everything remains solidly mounted after several snowy winters and a short speed burst that was slightly faster than the one reported by golfdave (but not as fast as the track speeds noted by others!), and nothing has proven to be troublesome through 3 factory service intervals and yearly safety inspections.

I remain very pleased with the car, and I plan to hang on to it for a while yet, at least until VW rolls out the Mk.8 GTE wagon with 242 hp! Hopefully golfdave will have an updated guide for that vehicle by the time I am ready to take delivery!
 
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