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Old 01-03-2013, 08:16 AM
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av98 av98 is offline
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Originally Posted by floydarogers View Post
Don't know if any of you subscribe to Car & Driver, but last month's issue (December) had an instrumented test of EPS vs. Traditional in a BMW-series. The 535xi still has hydraulic, while the 528xi (N20) has EPS, so they did some testing (about the only difference is that the 535xi has 143 lbs more weight on the front).

"After griping about EPS for years, the shocking revelation is that C/D's editorial staff preferred BMW's electric system over its hydraulic assistance. Total votes in 7 of 10 (subjective) categories favored EPS by 2 to 8 points each. Hydraulic shined in only the 3 feedback categories where it won the on-center by 4 points and tied with EPS in our middle-of-maneuver and at-cornering-extremes performance ratings."

Later, they note that Hydraulic effort rises quicker when going off-center. Also, the article notes that almost 60% cars come with EPS now, up from 25% in 2005.

Unfortunately, C/D seems to have changed their website and you can no longer search old issues, or link to articles. (Perhaps it's just a bit soon; the January issue just came out.)
I read that, great article. Especially the last part where they mention the Lotus Elise/Exige as the last manufacturer to offer a car with no power steering (hydraulic or electronic) but still has the best steering response and road feel; nothing beats the OG setup. Btw, the only reason they still have a 5 series with the HPS is due to the fact the EPS unit was so big, it couldn't fit in the car so they opted for the HPS.
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