07-02-2014, 10:14 AM | #199 | ||
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'21 /// M5 Comp - Frozen Brilliant White/Black
'18 Porsche GT3 Carrara White/Black/Red - Sold '18 /// M3 - Individual Imola/Black - Sold '15 /// M4 - YMB/SO - Sold '12 E92 ///M3 ZCP - AW/FR - Sold |
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07-02-2014, 10:36 AM | #200 | |
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07-02-2014, 01:33 PM | #201 |
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Has the bolt pattern changed from E90 to F80? I just happen to have 12mms and 15mms on my about-to-be traded E90...
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F80 6MT. In full color.
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07-02-2014, 02:03 PM | #202 | |
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We have the proper extended length studs in stock and can set you up.
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07-02-2014, 02:17 PM | #203 | |
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If they are, I will hang on to them when selling the car . |
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07-02-2014, 02:21 PM | #204 |
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Spacers are, but you need new bolts.
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07-02-2014, 03:16 PM | #205 |
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07-02-2014, 04:16 PM | #206 |
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07-02-2014, 04:27 PM | #207 |
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Depending on tire sizes, we'll need to play around with spacers to fine-tune.
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07-02-2014, 04:31 PM | #208 |
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oh I see haha, that's interesting. Just saw the goodwood run of the m4 and wow did it look crazy...sounded awesome through the straight.
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07-03-2014, 05:56 AM | #209 |
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looking very good.
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"Well, there's a straight-six engine at the front, a manual gearbox in the middle and drive goes to the back. That's Page 1, Chapter 1 from the petrosexual handbook" - JC
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07-03-2014, 08:14 AM | #210 | |
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The "Wtq" figure shown on chassis dyno charts is not torque at the wheels, it is an extrapolation of engine torque minus drivetrain losses (which is a number that does not exist IRL). I guess most people call it "wheel torque" because it is derived for the Whp number (power measure at the wheels). The real torque at the wheels is always multiplied by the drivetrain gearing, there is now way around this. Further, to really assess performance, you also need the wheel/tire diameter to establish the tractive force. The power number takes all this into consideration. That being said, as was discussed at length in other threads, engine torque without gearing tells very little about a car's ultimate performance. It is much easier to simply look at the power curve from that perspective when comparing different cars. Looking at the shape of the torque curve does give a good impression of how the engine will feel (lazy low end pull or empty down low, linear delivery or peaky delivery, top end rush or running out of breath) but tells little about actual performance. For example, comparing the S62 in the E39 M5 with S65 in the E9X M3. The S65 engine torque is much lower at 295lb-ft compared with the 369lb-ft of the S62. But when you factor gearing, it is a different story. In 6th gear (top gear), the M3 puts down a maximum 989lb-ft at the wheels compared to the M5's 964lb-ft. Just for comparison, the F8X will be putting down a whopping max 1189lb-ft in 6th . Last edited by CanAutM3; 07-03-2014 at 04:46 PM.. |
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07-03-2014, 09:15 AM | #211 | |
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so, higher torque means higher power, therefore a lot of torque means a lot of power. stronger low RPM torque, and still holding strong tq (almost 300 to the wheels) at redline is a good recipe for strong power. gearing helps some, sure, but there is no way that an e92 m3 feels strong whatsoever in 6th gear despite the shorter gearing. it may have short gearing, but it makes very low tq and at lower rpms, it just doesn't calculate to a lot of power. the e92 m3 spends almost half its rpms under 250 whp.
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07-03-2014, 09:30 AM | #212 | |||
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Power is measured/calculated based on the ability of a powertrain to accelerate a rotating mass. The "Wtq" value is then derived from the formula you quoted (Wtq=Whp*5252/Engine RPM). Dividing by the wheel RPM would yield the true wheel torque value. Quote:
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At 2000RPM in 6th, an E9X M3 makes more actual wheel torque than a 335i (~825lb-ft vs ~800lb-ft), yet 335i owners keep saying that the S65 lacks low end torque . Race an M3 and a 335i in 6th gear starting at 50mph and it will be pretty even at first and the M3 will eventually pull ahead. Sometimes it is a question of prespective, since the S65 pulls so much more when downshifting, it may feel week when kept in gear. The more power an engine can make over a broad RPM band will translate to better performance. And that seems to be the strong suit of the new S55 Last edited by CanAutM3; 07-04-2014 at 07:22 AM.. |
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07-05-2014, 06:48 PM | #215 |
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Only of related items, like wheel bearings, but that would be very rare.
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07-05-2014, 11:54 PM | #218 |
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07-05-2014, 11:54 PM | #219 |
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07-07-2014, 04:10 PM | #220 | |
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Surely you should (could) shift the e9x bhp and torque 1500 rpm off to the left to rebaseline and show the useable rev range like for like? I.e, 8200 rpm max vs 7000 rpm. Then you see something more interesting about the accelerative power difference at the "low" end and "high" end of the rev range of each engine. |
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