Now time (for modding: skirts, grille block, pizza pans)

[Sularus]

Looking at the photo you have up of your car, the sides look fairly effieceint for a factory car. Hyundais are known for being good cars, and they have come leaps and bounds in their designs. I would work on the front end, blocking off and diverting more air around to the sides of the car. Maybe a short duckbill spoiler to help the air seperate cleanly from the rear decklid. You should see some benefit from these mods. Maybe determine if there is anything you can do with the mirrors. They don't look efficeint as they could. The work so far does look good though.

[BHarvey]

I am blocking off those ugly fog lamp holes today to create a smooth curved front bumper. Maybe this will keep air closer to the sides of the car and if so then maybe the skirts will work.

[BHarvey]

Closed off the fog lamp holes and finished the lower block.
Made the lower block in 3 piece with one of those being adjustable. (not from inside)

Used to be that with only the upper grill block, that it would require a 30+ minute drive to get the AIT to it's normal range of +40 over ambient. Also used to take 5+ miles of driving to get the coolant up to 185f.

This morning the car warmed up in 3 miles and the AIT came up to +20 by the time I got to work, a 5.3 mile drive. Morning temp was 40f.

This afternoon the temp was 52f and the coolant was up to temp in about 2 miles and did get up to 203f before cooling back off. This is the highest it ever gets, even in the summer, so I don't know if the thermostat is fully open at that point, or the fan comes on. Never heard the fan, EVER, so unless it's unusually quiet....

Closed off the block by half to see what it does in the morning for test two.

In the 10 minute drive home the AIT got up to 40+ over ambient.

Now I just need to work on some cockpit adjustable grill shutters......

[CigaR007]

Originally Posted by BHarvey

Now I just need to work on some cockpit adjustable grill shutters......

That is where it gets tricky !

[Vekke]

When you install smooth hubcaps to very new cars you should check if the front tire spats are designed so that they will direct air to the brakes. When you block the wheel that air is not needed to go there so you should modify the flaps also.

If flap divert air to brakes they are usually wider than the tires and have usually some weird shapes.

[BHarvey]

The spat only diverts air away from the hole that is the tire well opening, no special shapes, just a flat blade that is equally as wide as the hole inside the wheel area, and is inset from the tire.

The lower grill is too much. I was running between 183f and 203f depending on load and when I got home I opened the door and left the car running, (yes, I know) and finally heard the fan.

Sat there until the fan cycled off, and then on again, and it comes on at 203f.
Went for a 5 mile drive after that and even going 40 mph with light to moderate load, it would still run hot enough for the fan to come on.

So, what this means is my lower grill block is too much, and without it in the summer, my upper is even too much?

I can understand if your are stuck in traffic and not moving, even with an open grill the engine could get hot enough for the fan to cycle. So, give me a baseline.

If you are moving at 30+mph and your running hot enough for the fan to cycle, is your grill blocked too much?

[BHarvey]

Abandoned the full block with 36 .5" holes.

Kept the partial sides and then made a two-piece sliding block.

Temp is 60f and with one side open I could load it up some and only net 195f.
But as soon as I slow down it will go high enough to kick on the fan.

With both sides open I could load it more with temps only getting 192f and it never crested 194f driving, but backing into the drive got it up to 199f.

It really seems like the lower grill needs to remain open in daytime temps.
Morning temps I can shut it as this morning it was fine on the way to work at 0430.
Temp was 35f and I had it almost closed off.

[jkv357]

You're getting some pretty good numbers out of your Sonata.

Have you tried a 0W synthetic oil? Have you done other non-aero mods?

If so, is there another thread around here (not in the aero section) about it?


Jay

[BHarvey]

Originally Posted by jkv357

You're getting some pretty good numbers out of your Sonata.

Have you tried a 0W synthetic oil? Have you done other non-aero mods?

If so, is there another thread around here (not in the aero section) about it?


Jay

All tanks so far on my log were with an upper grill block and tires at 50psi.

Rest of the aero mods have been on the current tank of E-0.

Using 5w20 Mobile 1.

Would LOVE to find someone that knows how to make changes to the ECU via flash programming and just make two very small changes, which would probably net 3-4 mpg!

Can't seem to keep the wheel cover bolts tight and they have lock washers on them. Guess it's time for some Loctite....

[jkv357]

Give some 0W-20 Mobil 1 a try next time around.

(Maybe you know this, but...) 0W oils give better mileage by flowing easier - giving better mileage - at low temps and all the way up to the temp required to give its top (20) rating. 0W-20 Mobil 1 gives the same protection and warranty coverage as 5W-20.

After it's hot, there's no mileage benefit.

I change to 0W-20 Mobil 1 in my car as soon as the temps start to drop, mostly for protection during (really) cold winter start-ups, but there is most likely a mileage benefit as well.


Jay