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Old 03-06-2006, 07:43 AM   #1
palpullero
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Question Thinking of putting 18x8" wheels; do I need suspension mods?

Hello:

I am thinking of putting Prodrives PFF-7 in my STi. They would be of size 18x8". My friend told me that if I do so, I would need to lower the car in order to not have huge gaps between the tires and the wheel well. He also told me the only thing to change would be the springs and also modify the camber of the wheels. I would appreciate a run-trough of what to expect and how to go about it from people that already have done it; it would be greatly appreciated.
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Old 03-06-2006, 09:02 AM   #2
Altaic
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You've been misinformed. The outer tire diameter should not change when you change the wheel size. In fact, since the wheel is wider, lowering the car could cause the tire to rub on the wheel well. I understand this isn't so much a problem with the sedans, though. Either way, the gap between the tires and wheel wells should definitely not be any larger. Perhaps your friend means that the gap seems larger, since the tire is lower profile? I personally don't think so, however some people have odd ideas about that gap.

Some things you may not have considered: Wider wheels do tend to tramline (tug the car into the recesses in the road where other cars have pushed the asphalt down) a lot more. Also, 18s tend to deliver a somewhat harsher ride since the tire is lower profile.

Camber and springs aren't very related to wheel choice, IMHO. A while after I installed 18x8 wheels, I installed slightly bigger front and rear swaybars and an ALK, and then I decided to add a bit of front camber. I like the 18x8s on my '05 WRX wagon, though. I run Kumho MX tires. Good stuff.
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Old 03-06-2006, 09:19 AM   #3
RaceComp Engineering
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Just keep in mind that wheel is very heavy, about 5 more lbs than stock. FYI.
PRodrive also makes some forged wheels that are actually made by RAYS.

Myles
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Old 03-06-2006, 09:34 AM   #4
Altaic
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^^^ Along those lines, if you haven't looked at SSR Competition wheels (14.6 lbs for 18x8), they might be worth a gander.

Also, I just realized your STi probably came with 8" wide wheels, so you shouldn't notice a difference WRT tramlining.
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Old 03-06-2006, 09:55 AM   #5
RaceComp Engineering
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Quote:
Originally Posted by Altaic
^^^ Along those lines, if you haven't looked at SSR Competition wheels (14.6 lbs for 18x8), they might be worth a gander.

Also, I just realized your STi probably came with 8" wide wheels, so you shouldn't notice a difference WRT tramlining.
Those were my thoughts exactly. Get a light weight wheel and loose some unsprung weight. Dont add a 24lb wheel to your car. Thats 8 lbs per wheel times 4. There is a old formula of 9lbs of weight per lbs of rotational mass. Do the math. Yes our cars have 300crank hp, but why reduce that for a heavy cast wheel. Dont get me wrong, if you need a TANK of a wheel, then yes those are THEones to get. We are Prodrive dealers, but get the forged series.

Myles
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Old 03-06-2006, 01:21 PM   #6
palpullero
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Quote:
Originally Posted by RaceComp Engineering
Those were my thoughts exactly. Get a light weight wheel and loose some unsprung weight. Dont add a 24lb wheel to your car. Thats 8 lbs per wheel times 4. There is a old formula of 9lbs of weight per lbs of rotational mass. Do the math. Yes our cars have 300crank hp, but why reduce that for a heavy cast wheel. Dont get me wrong, if you need a TANK of a wheel, then yes those are THEones to get. We are Prodrive dealers, but get the forged series.

Myles
Are the PFF7 that much heavier than the OEM BBS? Also, to get 24LBS then the PFF7 would have to be 6LBS each; otherwise, we are at the 32LBS level.

Thanks for the info!
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