02 TDI Jetta grille block

[ron22]

Originally Posted by deejaaa

lots of talk here about warm air intakes.

Yes on GAS engines this is a DIESEL

[ron22]

Better answer is test it both ways and see what works for you.

[Tesla]

Diesel's like air, the more the better and cold air is denser so more air per unit of volume.
The other points are that cooling the air in intercooler causes a small pressure drop, so less backpressure for the turbo compressor, this means less exhaust back pressure on the turbo side and higher efficiency.
What you might want to consider is a RAM air cold intake.

The other point anyone running a diesel should have both boost and EGT gauges and understand what they mean, they should guide your driving behaviour.
High EGT's is what kills diesel engines, the hotter the air intake the higher the EGT's, running the engine hotter may yield a small benefit in FE, but it's false economy when engine longevity is compromised.

[deejaaa]

it's working for me.

PS: i didn't know this was a quiz.

Originally Posted by ron22

Better answer is test it both ways and see what works for you.

[deejaaa]

for some reason, VW didn't add a volt meter in the Jetta, so i will be adding this one. $5.00 off the bay. thing is small!

[UltArc]

I love the build of your rear cavity- it mixes my love (and large quantity) of polycarbonate with someone who has [the] passion to make it look good. (Random, but why I often stop by lol)

My plan was to do this as a rear tail on my Insight, but I have since made a new plan. Look forward to seeing it installed.

[ron22]

deejaaa, Did you do any testing before and after with the rear end mods? Would love to know if they helped at all.

[deejaaa]

Originally Posted by ron22

deejaaa, Did you do any testing before and after with the rear end mods? Would love to know if they helped at all.

no ABA but i was getting 50 before the grille bolck, front flaps and rear mods. when i get more time, i will remove one at a time to test but i want to get the wheel skirts and smooth wheel covers on first.

[COcyclist]

Your mods look good. Funny, I sealed the bottom front corners on my Mk IV with coroplast. We think alike.

Originally Posted by Tesla

Diesel's like air, the more the better and cold air is denser so more air per unit of volume. What you might want to consider is a RAM air cold intake. High EGT's is what kills diesel engines, the hotter the air intake the higher the EGT's, running the engine hotter may yield a small benefit in FE, but it's false economy when engine longevity is compromised.

If you hypermile slow and easy on the flat land of Texas you may be fine with such extensive grill blocking, especially if you are not using A/C. I monitor Intake Air Temperature (IAT) on my ScanGuage and it can go to over 200 F on long climbs in the Rockies. IIRC I read somewhere that a degree of intake temp increase is like 3 degrees of Exhaust Gas Temperature. I have the top left grill block open to feed cool high pressure air to the factory ram air intake. I have the intercooler grill open except in winter when I block part of it.

I have a full belly pan from the front to the back bumper. Check my album. I have loaded some pics. I only screwed into plastic- body plugs, bumper edge etc. There is a wind deflector plastic ahead of the fuel tank of the Golf. I pulled it off so I didn't drill into the tank but I have a couple of screws into that plastic.

[ron22]

Have you ever looked real close under your Jetta or Golf?
VW did a lot of work under there to streamline it. There are a lot of little plastic pieces that deflect air over/around parts.
There is one in front of the rear axle and a few others.
I think a full belly pan is better.