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12-04-2012, 08:06 AM | #23 | |
TIM YOYO
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Gearing multiplies torque, but it does not affect power. Peak acceleration will come at peak power. Engines like the S54 will work best when shifted at redline, but that's the exception, not the rule (for road cars).
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12-04-2012, 09:27 AM | #24 | |
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And to clarify, 1M goes to redline with little to no complaint, there is still good power and torque at 6000s but there are no real gains to stay after 6000 too long and I found that shifting like stated above puts you back at the exact sweet spot again to continue acceleration. Other notes for whoever unfamiliar are redline is at 7000, fuel cut comes a bit after which should be avoided. My Mustang dyno runs on the stock car showed that torque reaches its peak around 2600 rpm and stays almost constant till 6000, very little fall till 6500. HP reached its peak around 5300-5500 rpm and after that smoothly falls till 6500, nothing like a sharp fall which supports butt dyno impressions.
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"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
BMW 1M-SOLD-: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, BMS OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake. Last edited by ozinaldo; 12-04-2012 at 09:34 AM.. |
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12-04-2012, 05:27 PM | #25 | |
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gearing still effects acceleration, if you have a 14:1 overall ratio and xxx HP, it'll accelerate faster than 13:1 and xxx+10 HP, until your HP drops way down closer to redline even if power drops of WAY before redline, it's always beneficial to go a LITTLE past peak power, to the point a higher gear will accelerate you faster. turbo cars SHOULD make peak power at redline, with anappropriate sized turbo etc.. as any power production should be overcome by pushing in more air.. cars like the N54, howeer, weren't designed from te start as racecar style, so the turbos can't push that far. graphs of RB turbos show that peak power CAN be made at or near 7000rpm in the N54.. peak torque almost holds to there as well (but a huge hump a bit below 6) |
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12-06-2012, 09:12 PM | #26 | |
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12-08-2012, 01:05 PM | #27 |
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Why do you need a boost gauge?
Simple to remind you when you can smile and laugh like a lunatic to and from work. That's why BMW! A car is a car is a car is a car! of 1k cars you sell only 50 ever see a real track. The other 99% don't! So make me smile you subdued German fucks! |
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12-08-2012, 02:55 PM | #28 | |
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And a JB4 would get you your PSI levers and it is very sensitive and accurate. As mentioned before. Last edited by ChristianReyess; 12-08-2012 at 05:27 PM.. |
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12-08-2012, 02:59 PM | #29 |
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12-08-2012, 05:35 PM | #30 |
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pppffffttt! no wonder this car is crap in the snow....1500rpm and it can spin its tires!
I mentor some great kids for FIRST Robotics comps and one of the kids asked me why my car didn't come stock with dual turbo gauges. Well me being the "adult" said something about costs and bla bla bla and one of the kids says with out even blinking an eye.... "Turbo gauges for tubro cars are like fake tits....sure they don't do much but they are sure pretty to look at!" And with that I was done for the day! |
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12-08-2012, 06:27 PM | #31 | |
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"The mark of a great car is one whose overall competence exceeds what you should expect from its individual components and the 1M does just that", Chris Harris.
BMW 1M-SOLD-: TECH: Evolve Race+N55mids, Evolve IC, Michelin PSS, ER cp, aFe filter, CDVx, Vorshlag camber plates, BMS OCC EXTERIOR: trunk spoiler, blacklines, black grills, IND goodies INTERIOR: Alcantara steering wheel, steel pedals, custom mats, MPower e-brake. |
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12-12-2012, 06:07 AM | #32 | |
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JB4 doesn't get you a SUPER accurate gauge, only your temp gauge hijacked. lol why? just losing acceleration the second benefit of shifting higher, is if you shift at say 6250rpm, the higher gear will be waaay off he low side of the power band, probably even down below 250hp in that graph shift at 6500-7000, even as low as 280hp, and you'll 'drop down' into a much higher 270-280 range.. and 280hp in 2nd gear has more acceleration than 280hp in third, so either way, staying in the higher gear until AT LEAST 6500rpm gives you better acceleration... acceleration isn't about peak power, it's about average power, how much area there is below you on the graph... i could work it out better if the dyno operator actually stuck it to above 6500, it may very well be worth going much closer to 7000. |
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12-13-2012, 01:00 AM | #33 | |
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12-13-2012, 01:08 AM | #34 |
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12-14-2012, 11:30 AM | #35 | |
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Didn't really think about where you would drop to at the higher gear. That makes a lot of sence! |
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12-14-2012, 11:39 AM | #36 |
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