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Originally Posted by yepvegas
So my plan was to change the tires ... from 205/50/17 to 225/55/17.
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It might be different in the US, but 205/50/17 is unusually narrow for 17" here, so wider tyres are cheaper !
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I think it will help the final gearing a little, do I have that right?
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It will make all gears longer.
Tyre size calculator.
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I wll be droping the ride 2.5 inches maybe 3.
Will blocking the lower opening on bumper make that much of a difference? How much can I gain from underpanning, the entire car?
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They'll all help, but it's difficult to say by how much as every car is different.
The biggest gains are usually to be made thru driving style and lower speed, unless you want to go all out on aerodynamic mods and start adding very visible things like a boattail, wheelskirts and a redesigned front fender.
Speed and high fuel economy takes something like
basjoos' aerocivic.
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Any mods I do has to look good so I'm at a loss on how to block the lower bumper opening it is pretty big.
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Block it on the inside and paint the block black - car manufacturers are doing the same.
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I will not block the upper portion I will not risk overheating the car.
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See if the radiator extends down to the lower opening - it probably will - if so it can grab cold air down there.
Obviously, it's advisable to monitor intake and coolant temp. before and after this kind of mod.