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      01-12-2015, 03:05 PM   #45
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An excerpt form the thread "Easiest way to get some gains" at e90post.com:

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Originally Posted by pavproch View Post
Actually, Iīm going for it with the other car of mine (Z4 e89 30i).... just fitted in an aftermarket (Drexler) diff final ratio of 5.00 instead of original OEM 4.27, thus expecting something like extra 17% of whp.... I will field-report coming April, once I pull my Z4 out of winter hibernation...
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      02-05-2015, 03:44 PM   #46
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Well, havenīt ridden it myself yet, but the guy who did the diff final gear swap, has .... he reports almost unbelievable leap in performance... lemme cite his saying:

"It runs like ///M3 e46 of mine"

Needless to say, his M3 already undergone a heavy race-track-aimed tune.. I feel like wanting a spring to come asap....
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      04-15-2015, 01:21 AM   #47
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Well, already have .... 17% more whp definitely turned the beauty into the beast (or what ?) ......

I guess he did not exaggerate, now 30i runs truly somewhere in ///M3 e46 range
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Funcar: Z4 3.0i 6MT - HR SportSprings +sways, OZ Ultraleggera 19", 5.00 diff by Drexler, CDV off, Quaife LSD, M235i SportBrake (front), Cquence rotors (rear)
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      04-23-2015, 01:30 AM   #48
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Quote:
Originally Posted by StevenChanApproved View Post
I am at 302hp with my 30i.

I currently have Afe Drop in filter, Remus exhaust with secondary cats deleted. I had the car tuned by Frank Smith.
I'll believe it when I see the dyno.
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      04-26-2015, 02:24 AM   #49
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Well, having run few hundred kilometers I guess I got the message.... the fun factor gain is (in my eyes) simply worth every single buck it cost ...

Whatever gear I shift in now, it runs like hell, even against a steep hill climb...

But, to be honest I gotta admit some downsides, too: 0-100kmph cannot be covered on first+second gears anymore, at around 80kmph I must shift a third gear, and the mileage dropped by approx same ratio the diff had been cut (with the "summer driver" I donīt care a bit about).
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Funcar: Z4 3.0i 6MT - HR SportSprings +sways, OZ Ultraleggera 19", 5.00 diff by Drexler, CDV off, Quaife LSD, M235i SportBrake (front), Cquence rotors (rear)
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      04-26-2015, 02:38 AM   #50
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And, needless to say (and apart from the driver who somehow became definitely the slowest part of the car ), a brakes performance (I still run OEM sezup ie 330/24 mm rotors front a nd 300/20mm rear) seems to becoming inadequate now... two or three "dramatic" slowdowns and a significant fading appears...

I think I know what I will be doing next winter....
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Funcar: Z4 3.0i 6MT - HR SportSprings +sways, OZ Ultraleggera 19", 5.00 diff by Drexler, CDV off, Quaife LSD, M235i SportBrake (front), Cquence rotors (rear)
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