Does anybody made a DIY rear undertray/diffuser ?

[GriffX]

On the driver side my CAI is getting all the air through this gap to the hood. So, your deflectors are not directing the air to the ground only to the side? Not easy to see on the pictures.

 

[GriffX]

Version 2.0, front and rear

 

[Forty61]

Man I'm impressed you guys all put so much effort into these under body mods.. my little front tray thing got wrecked by a rogue piece of tire on the freeway and I straight up just never replaced it!

 

[GriffX]

Man I'm impressed you guys all put so much effort into these under body mods.. my little front tray thing got wrecked by a rogue piece of tire on the freeway and I straight up just never replaced it!

That is my way of putting some sanity in my life
It is hard to find serenity when you read the news from Europe....especially when you are in Europe

And, if you have to pay 8.50 per gallon you look out to gain some mileage

 

[JC SSP]

I am considering a front belly version, so water doesn't get into my JLT intake, alternator, fan, etc.

 

[Dino Dino Bambino]

And, if you have to pay 8.50 per gallon you look out to gain some mileage

I should count myself lucky then! At my local gas station in Cyprus, 95 RON is $5.93 per US gallon (€1.40 per liter).
Nevertheless I've tried to eke out every mpg possible with my drag reduction mods. I see getting a combination of more N/A power and better gas mileage as a challenge.

 

[GriffX]

I should count myself lucky then! At my local gas station in Cyprus, 95 RON is $5.93 per US gallon (€1.40 per liter).
Nevertheless I've tried to eke out every mpg possible with my drag reduction mods. I see getting a combination of more N/A power and better gas mileage as a challenge.

8.50 is 93 (98 RON) but they already announced a massive CO2 tax increase for next year.

Car is much more stable at high speed now with the front panels.

 

[StockishS197]

Version 2.0, front and rear

View attachment 105528
View attachment 105529

How has this effected your low speed cooling?

On my prior 06 GT, I did the 2010 belly pan and similar mods and the amount of air that got trapped in the engine bay was significant at the detriment of higher IATs and ECT.

 

[Dino Dino Bambino]

How has this effected your low speed cooling?

On my prior 06 GT, I did the 2010 belly pan and similar mods and the amount of air that got trapped in the engine bay was significant at the detriment of higher IATs and ECT.

That hasn't been a problem for me. If anything sealing off the underside of the engine bay prevents air stacking up under the hood, allows the cooling fan to work more efficiently because it doesn't have to work against pressurized air in the engine bay, and reduces the chance of hot under hood air getting into the CAI. When you also have the benefits of improved gas mileage, improved high speed stability, and a higher top speed due to a lower drag coefficient, it's a win win all round.

8.50 is 93 (98 RON) but they already announced a massive CO2 tax increase for next year.

Here 98 RON is €1.47 per liter or $6.22 per US gallon, and I'm already paying an eye-watering €1312 per year in road tax 'cause the car is in the highest band for CO2 emissions. By comparison my annual fuel bill (roughly 3000 miles or 5000km per year) is only ~€850 and my insurance is ~€350. Despite the expense, keeping Scarlett on the road is worth it in spades. You can't put a price on smiles per mile!

 

[GriffX]

How has this effected your low speed cooling?

On my prior 06 GT, I did the 2010 belly pan and similar mods and the amount of air that got trapped in the engine bay was significant at the detriment of higher IATs and ECT.

Coolant temp is the same as before, I have an CAI, the car doesn't have a coolant temp sensor, so I guess the engine temp is roughly the same. Maybe the fan kicks in a bit earlier than before?

 

[GriffX]

Here 98 RON is €1.47 per liter or $6.22 per US gallon, and I'm already paying an eye-watering €1312 per year in road tax 'cause the car is in the highest band for CO2 emissions. By comparison my annual fuel bill (roughly 3000 miles or 5000km per year) is only ~€850 and my insurance is ~€350. Despite the expense, keeping Scarlett on the road is worth it in spades. You can't put a price on smiles per mile!

91 (95RON), the intraday variance at one station is huge, yesterday it was from 1.66 (7.14$) to 1.82€/l (7.83$), maximum for 93 (98RON) was 2.08€ (8.95$)

I could not afford to drive the Mustang the whole year. Insurance a year would be 900€, with tax I have some luck, because I own the car since 2007 it is only 300€, now it is 1500€, but the new socialist Gouvernement wants to install a road toll. If I could leave Germany I would.

 

[GriffX]

Maybe some of the panels can be retro fitted. Would be nice to know what kind of material it is, looks like a fiber composite.

 

[GriffX]

Results 300 miles trip: Speed most of the time 70-75 mph, 27 mpg (3.73 gear), no cooling issues (72F outside, global boiling.... )

Update: I noticed that the exhaust tone is more emphasized than before, that could be a side effect that the air at the front is smoother and do not produce so many turbulences anymore (?)

 

[GriffX]

not sure if I will add strikes. It is more difficult than I thought, starting with the material, must be light and stable at 140 MPH and look "professional". Was thinking of 8 mm PE, but was way to heavy, plywood lot of work to make waterproof, ABS looks like home build .....