Back to the summer setup - the car flies!
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Joined: Jun 2004
Posts: 1,169
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From: Cincinnati, Ohio
I just replaced my OEM 18" rims and Michelin Pilot Sport A/S tires with my summer setup: Goodyear F1 GS-D3's on 19" BBS RS-GT's. I'm not sure how to explain it, but the difference is like I just added 30 HP to the car! Response is instant, and at hwy speeds, I can 'chirp' the wheels with a perfect shift into third! I felt the difference in response and power was amazing.
To check my 'seat of the pants', I ran the car through my standard test on the same stretch of road: 2 way runs, third gear, full throttle, timed from 2000 - 5000 RPM. My last times with the OEM setup were:
8.72, 8.75 one direction. 9.28, 9.35 other direction.
On an earlier day, I ran:
8.98, 9.03 one direction. 9.33, 9.47 other direction.
My test today with the BBS setup was:
8.13, 8.21, 8.19 one direction. 8.50, 8.49, 8.45 other direction.
These results are consistent with earlier runs with the BBS setup.
The difference is over .5 seconds! The best explaination I can come up with is the much lighter wheels (>10 lbs lighter), plus a VERY SMALL difference in rolling diameter (about 2mm). Its just hard to believe the wheels make this much of a difference, but 'seat of the pants', and the data say it's so. I'm guessing this equates to a couple tenths in the quarter mile - a pretty good 'power' upgrade.
To check my 'seat of the pants', I ran the car through my standard test on the same stretch of road: 2 way runs, third gear, full throttle, timed from 2000 - 5000 RPM. My last times with the OEM setup were:
8.72, 8.75 one direction. 9.28, 9.35 other direction.
On an earlier day, I ran:
8.98, 9.03 one direction. 9.33, 9.47 other direction.
My test today with the BBS setup was:
8.13, 8.21, 8.19 one direction. 8.50, 8.49, 8.45 other direction.
These results are consistent with earlier runs with the BBS setup.
The difference is over .5 seconds! The best explaination I can come up with is the much lighter wheels (>10 lbs lighter), plus a VERY SMALL difference in rolling diameter (about 2mm). Its just hard to believe the wheels make this much of a difference, but 'seat of the pants', and the data say it's so. I'm guessing this equates to a couple tenths in the quarter mile - a pretty good 'power' upgrade.
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Joined: Feb 2005
Posts: 237
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From: So. California
My Ride: '05 545 Sport Week 9
Originally Posted by wolverine' date='Mar 14 2005, 06:32 PM
I just replaced my OEM 18" rims and Michelin Pilot Sport A/S tires with my summer setup:? Goodyear F1 GS-D3's on 19" BBS RS-GT's.? I'm not sure how to explain it, but the difference is like I just added 30 HP to the car!? Response is instant, and at hwy speeds, I can 'chirp' the wheels with a perfect shift into third!? I felt the difference in response and power was amazing.
To check my 'seat of the pants', I ran the car through my standard test on the same stretch of road:? 2 way runs, third gear, full throttle, timed from 2000 - 5000 RPM.? My last times with the OEM setup were:
8.72, 8.75 one direction.? 9.28, 9.35 other direction.?
On an earlier day, I ran:
8.98, 9.03 one direction.? 9.33, 9.47 other direction.
My test today with the BBS setup was:
8.13, 8.21, 8.19 one direction.? 8.50, 8.49, 8.45 other direction.
These results are consistent with earlier runs with the BBS setup.
The difference is over .5 seconds!? The best explaination I can come up with is the much lighter wheels (>10 lbs lighter), plus a VERY SMALL difference in rolling diameter (about 2mm).? Its just hard to believe the wheels make this much of a difference, but 'seat of the pants', and the data say it's so.? I'm guessing this equates to a couple tenths in the quarter mile - a pretty good 'power' upgrade.
To check my 'seat of the pants', I ran the car through my standard test on the same stretch of road:? 2 way runs, third gear, full throttle, timed from 2000 - 5000 RPM.? My last times with the OEM setup were:
8.72, 8.75 one direction.? 9.28, 9.35 other direction.?
On an earlier day, I ran:
8.98, 9.03 one direction.? 9.33, 9.47 other direction.
My test today with the BBS setup was:
8.13, 8.21, 8.19 one direction.? 8.50, 8.49, 8.45 other direction.
These results are consistent with earlier runs with the BBS setup.
The difference is over .5 seconds!? The best explaination I can come up with is the much lighter wheels (>10 lbs lighter), plus a VERY SMALL difference in rolling diameter (about 2mm).? Its just hard to believe the wheels make this much of a difference, but 'seat of the pants', and the data say it's so.? I'm guessing this equates to a couple tenths in the quarter mile - a pretty good 'power' upgrade.
[snapback]101516[/snapback]
Do you have any pictures of the wheels on the car? What is the weight of the stock 18's?
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Senior Members
Joined: Jun 2004
Posts: 1,169
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From: Cincinnati, Ohio
Originally Posted by TitaniumGray5' date='Mar 14 2005, 08:26 PM
[quote name='wolverine' date='Mar 14 2005, 06:32 PM']I just replaced my OEM 18" rims and Michelin Pilot Sport A/S tires with my summer setup:? Goodyear F1 GS-D3's on 19" BBS RS-GT's.? I'm not sure how to explain it, but the difference is like I just added 30 HP to the car!? Response is instant, and at hwy speeds, I can 'chirp' the wheels with a perfect shift into third!? I felt the difference in response and power was amazing.
To check my 'seat of the pants', I ran the car through my standard test on the same stretch of road:? 2 way runs, third gear, full throttle, timed from 2000 - 5000 RPM.? My last times with the OEM setup were:
8.72, 8.75 one direction.? 9.28, 9.35 other direction.?
On an earlier day, I ran:
8.98, 9.03 one direction.? 9.33, 9.47 other direction.
My test today with the BBS setup was:
8.13, 8.21, 8.19 one direction.? 8.50, 8.49, 8.45 other direction.
These results are consistent with earlier runs with the BBS setup.
The difference is over .5 seconds!? The best explaination I can come up with is the much lighter wheels (>10 lbs lighter), plus a VERY SMALL difference in rolling diameter (about 2mm).? Its just hard to believe the wheels make this much of a difference, but 'seat of the pants', and the data say it's so.? I'm guessing this equates to a couple tenths in the quarter mile - a pretty good 'power' upgrade.
To check my 'seat of the pants', I ran the car through my standard test on the same stretch of road:? 2 way runs, third gear, full throttle, timed from 2000 - 5000 RPM.? My last times with the OEM setup were:
8.72, 8.75 one direction.? 9.28, 9.35 other direction.?
On an earlier day, I ran:
8.98, 9.03 one direction.? 9.33, 9.47 other direction.
My test today with the BBS setup was:
8.13, 8.21, 8.19 one direction.? 8.50, 8.49, 8.45 other direction.
These results are consistent with earlier runs with the BBS setup.
The difference is over .5 seconds!? The best explaination I can come up with is the much lighter wheels (>10 lbs lighter), plus a VERY SMALL difference in rolling diameter (about 2mm).? Its just hard to believe the wheels make this much of a difference, but 'seat of the pants', and the data say it's so.? I'm guessing this equates to a couple tenths in the quarter mile - a pretty good 'power' upgrade.
[snapback]101516[/snapback]
Do you have any pictures of the wheels on the car? What is the weight of the stock 18's?
[snapback]101551[/snapback]
[/quote]18" BBS RS-GT's are 20.3 lbs and 21.0 lbs for front and rear respecively (8.5 and 9.6 width). These are about 12 lbs lighter than your stock 18" wheels, and the Max Performance tires are another 4 lbs lighter than the runflats, so you'll save 16 lbs per wheel! I would highly recommend the 19's though. Much better look and performance. The 18's could be a little soft in the sidewall compared to the runflats.
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