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Old 03-10-2017, 10:45 PM   #171
golfdave
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Quote:
Originally Posted by CLDUCK View Post
Yeah i can fully understand and thats why i was thinking of getting the skid tray with the gear box cooling holes
Hopefully it would add to the positive air pressure inside the engine bay, forcing its way out more down the tunnel, maybe...
Hmmm,

good thinking there...
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Old 03-11-2017, 12:14 AM   #172
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Quote:
Originally Posted by CLDUCK View Post
Yeah i can fully understand and thats why i was thinking of getting the skid tray with the gear box cooling holes
Hopefully it would add to the positive air pressure inside the engine bay, forcing its way out more down the tunnel, maybe...
The lower engine bay cover lowers engine bay pressure and that's a good thing for
cooling, since the lower engine bay pressure helps for a bigger pressure difference
between in front of the radiator and back of it, increasing through-radiator air flow.
With the lower cover, the only way for any air to enter the enigine bay is passing the
radiator. Less air leaks, improved efficiency.
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Old 03-11-2017, 09:59 AM   #173
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With the lower cover, the only way for any air to enter the enigine bay is passing the
radiator. Less air leaks, improved efficiency.
errrr...no!

High entry point is the slam panel, left hand side fully open, next to the air intake for the engine. I know as loads of dirty road spray gets on the left side of engine. The VW GRP skid tray has two NACA ducts in it which scoop air up & into the engine bay & mainly directed at the gearbox area. The only easy way out for this is either via the driveshaft exit holes in the wheel arch, or backwards down along the exhaust tunnel.
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Old 03-11-2017, 12:01 PM   #174
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Right, there's one vent for the generator and there are two for the gearbox.
Quite negligible in this context, as the skidtrays and covers still reduce engine
bay pressure thus increase radiator airflow and that's the point. Self-evidently
an automotive engine bay can't be hermetically sealed.
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Old 03-11-2017, 12:51 PM   #175
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Right, there's one vent for the generator and there are two for the gearbox.
Quite negligible in this context, as the skidtrays and covers still reduce engine
bay pressure thus increase radiator airflow and that's the point. Self-evidently
an automotive engine bay can't be hermetically sealed.
The whole point of what "CLDUCK" was trying to state is the fact if you fit the full engine skid tray & then cover up the whole length of the exhaust tunnel, that as air is entering the engine bay via the Naca ducts & slam panel that it will eventually make it's way down & along the exhaust tunnel...the rear opening just before the fuel tank will be under a small amount of negative (suction) pressure, therefore he hopes that this will help pull the air flow down along the exhaust tunnel...thus cooling the exhaust silencer

From what I remember doing windflow stuff I have no reason to doubt it..
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Old 03-12-2017, 07:12 AM   #176
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Apologies gentlemen ive for some reason not seen any notifications of the quotes and chat - i'll get onto that once ive posted this

Great to get ideas flowing on this subject as ive had all these thoughts with that voice in your head that argues back... im mentally stable

Im really wanting to get the car up in the air now that all the panneling is done and to check for possible signs of excessive heat in that area. Once I do, I will take pictures and share them including the panel I have created.
Ive got a 400mile journey to do next weekend coming back from Hastings, of which will be a great test for heat soak into the cabin floor. Im hoping at somepoint in the journey it will run a DPF Re-gen.

To reiterate what Dave has said on a previous subject, the car certainly does feel a considerable amount more solid/planted at speed as opposed to the rear of the car being jittery.
"I can also report that the rear of the car feels less “light” & more “planted” & stable when going around fast corners.."

Great to have this debate with like minded people
Best regards
Connor
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Old 03-27-2017, 11:40 PM   #177
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Quick question regarding the aero trays.

With part 3Q0825236 there seems to be multiple revisions available

3Q0825236, 3Q0825236-C, 3Q0825236-D

Anyone know the difference?
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Old 03-28-2017, 09:17 AM   #178
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Originally Posted by flutie98 View Post
Quick question regarding the aero trays.

With part 3Q0825236 there seems to be multiple revisions available

3Q0825236, 3Q0825236-C, 3Q0825236-D

Anyone know the difference?
No, it could be a totally different part, or just the latest build version...double check with ETKA & see what it says
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Old 03-30-2017, 07:12 PM   #179
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Quote:
Originally Posted by flutie98 View Post
Quick question regarding the aero trays.

With part 3Q0825236 there seems to be multiple revisions available

3Q0825236, 3Q0825236-C, 3Q0825236-D

Anyone know the difference?
If ordering one, you need to see a photo of the actual part.
In my searching of images, it seems that they would come with vent holes, no holes, insulation, etc. Didn't seem to match to any specific p/n revision, either.

I went by price, and ended up with a 5Q0825236, a non-vented shield from an Audi TDI (I think). I have a 5 speed manual and 1.8 TSI, and do not drive the car hard, so I was okay with not having bottom engine vents. My oil temps are up 2-3 degrees, on average, but still below stock USA GTI levels.
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Old 04-19-2017, 07:46 PM   #180
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I had my under tray replaced by the VW garage because the previous VW garage which repaired my damaged GTD did not replaced it.
I was wondering if there was a fondamental difference between the old one (5Q0825236)



And the new one (5Q0825236Q)




Obviously there is extra vent now, for the gearbox it seems. I guess that is good. But does it make the engine bay more prone to dirt too and more vulnerable to rock and such.
I guess that is fine like that, I was just surprise when I got the car back from the garage to see that the parts are differents. I did not know that was such a variety of model for such a "simple" part!
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