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Old 06-10-2018, 05:49 AM   #1 (permalink)
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2008 Impala 3.5 LT. Remove Spoiler?

Hey guys. I recently picked up a clean Impala LT with 71,000 miles for $2500. Original owner passed away, it sat for 18 months in a garage. Right away I noticed it rewards driving for fuel economy. A 2.86 gear ratio with good low end torque from the pushrod 3.5. Being rather conservative, about 27-28mpg to a tank. A strong effort during a 100 mile trip with some traffic lights netted 33 mpg. It really seems to have a sweet spot at 67 mph.

So far I've bumped tire pressure to 41 psi (just under what trips the sensors).
Changed the trans-fluid to synthetic.
Modified the intake to pick up more hot air, but it is not a full WAI.

The car has a factory spoiler. It also has an unusual raked stance. The rear of the car is noticeably higher than the front. I took the photos in dark, I think it shows the angles a little better. Speed limiter kicks in at 102 so I won't be needing any extra down force.





Stock photos..



No Spoiler


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Don't know why it says 00, it's a 95
374,000 miles and tired.

Last edited by YukonCornelius; 06-10-2018 at 06:00 AM..
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Old 06-10-2018, 11:20 AM   #2 (permalink)
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The spoiler on that likely isn’t hurting you much if any... it is pretty low and does angle up to the rear, reaching upward toward the “template shape”
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Old 06-10-2018, 12:38 PM   #3 (permalink)
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Most "stock" spoilers are designed to create no downforce and as little drag as possible. In some cases, they might even improve aerodynamics a bit.
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Old 06-10-2018, 01:21 PM   #4 (permalink)
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You could always do ABA testing to see the effect of your spoiler on your fuel economy.
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Old 06-10-2018, 04:33 PM   #5 (permalink)
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Quote:
Originally Posted by mpg_numbers_guy View Post
You could always do ABA testing to see the effect of your spoiler on your fuel economy.

That would be tricky for me because I do not have a set driving routine.


Spoiler aside, does anyone think I would benefit from leveling rear suspension on the car? That would be a free mod.

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Don't know why it says 00, it's a 95
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