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09-07-2007, 03:42 AM | #23 |
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09-07-2007, 08:28 AM | #24 | |
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On a real road, it will not look like that in first gear (car will not stay in low revs long enough to build boost to create a torque curve like that). That torque curve would be VERY hard to replicate. Would probably need to be going up a steep hill in a high gear (only way to put the engine under enough load where it stays at low revs long enough to build maximum boost)... Of course driving up a steep hill at low speed in 5th gear, for example, will produce terrible acceleration, but it will make the torque curve start very early. It's just a way to manipulate the specs to make them seem more impressive than they really are. Porsche produces similar graphs for its 911 Turbo. Looks great on paper - not very accurate when driving it (power doesn't come on until revs are much higher than what Porsche claims for the begining of the torque plateau)...
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09-07-2007, 10:17 AM | #25 | |
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09-07-2007, 10:53 AM | #27 | |
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09-07-2007, 11:18 AM | #28 |
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Well, I intend to use the 135i for Solo2 racing. Even though that is more about handling than acceleration, launch technique is important.
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09-07-2007, 11:49 AM | #30 | |
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Then they go to a construction site and see some old framer sinking big framing nails all the way in with two strikes of the hammer, and ask "how does he do that?" It's still a stupid hammer, but the results can be very different depending upon how it is used. |
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09-07-2007, 03:38 PM | #32 | |
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What about Chucky? He's driven it, maybe he will log onto the board and share his launch secrets. It could happen... On second thought, this board might have burned their bridges with this guy with all the Chucky stuff, so that's not too likely? .<photoshop credit back to bryan@mworks>. |
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09-07-2007, 06:01 PM | #33 |
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All you need to build boost from a start is a stutter box. My friend has one installed on his Talon. Check out the video about 5 seconds in. The RPM bounces like crazy building the boost. He usually launches around 21PSI or so. http://www.jhracing.net/files/9.5_150_InCar_crop.mov
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09-07-2007, 06:21 PM | #35 |
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Not quite, 9.5 @150MPH. It's for sale if you're interested. http://www.jhracing.net/
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09-08-2007, 01:18 AM | #38 |
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In my procede 335i AT my best ET's were 12.63 and 12.66 Procede V1.4. My sixty foot times were 1.9's. IN the AT all you do is Push the DTC button Once (yes, this has already proven to be the best method for all 335i's) and brake torque to about 2k rpm. While I'm brake torquing I releast the brake as the RPM's are climbing so that it's completely released at the tach hits 2k.
With the MT's, because there's 250wtq at 2500 rpm's stock, just feather the clutch at about 2500 rpm and modulate the throttle until you can completely floor it. Only very good MT drivers have broke 2.0 60ft times so far. |
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09-08-2007, 06:17 PM | #39 | |
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Yep it is required at that speed, and he has them installed on the back hatch. You should see the looks he gets from people on the road as he is driving it to the drag strip. :eyebulge: It's completely street legal. It has working lights, wipers, horn, etc.
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09-09-2007, 01:17 PM | #40 | |
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It sounds like putting a stutterbox in a 135i would get the load up to spool up the turbos, but then what would we do in a 135i? Dump the clutch like in an AWD car? Feather the clutch out while the engine is bouncing wildly between 4-6 thousand rpm? I don't see a real lauch technique for getting load up and allowing for a smooth clutch release without just burning off one rear tire. I'm still looking for that theoretical launch technique that will get the turbo boost up, but still allow a smooth power transfer to the back tire with traction. Gotta be ready for those demo days... |
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09-09-2007, 01:36 PM | #41 | |
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From what I've read, the Procede MT's don't see any improvement over stock in sixty-foot times despite the increased theoretical higher turbo boost. It makes me wonder if the problem is that the turbo is never able to attain full boost using the traditional NA engine launch technique. The engine is the same between both the AT and the MT, so I suspect the launch technique for the MT's isn't getting the turbos spooled up, which would put the MT's down on power compared to the AT's right from the start. I think they need a way to get the boost up prior to launch, while still not burning off the rear tire or the clutch. I'm guessing we will see the same issue for the 135i's. |
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09-10-2007, 08:35 AM | #42 | |
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Also, to those that responded you want to do spirited driving. Well, I drove my STi spiritedly at times and did not need to launch it. There is no reason th launch the car on the street. |
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09-10-2007, 08:40 AM | #43 | |
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Such could be said about 99% of the threads on this forum. Who cares, though? Some people like to speculate, about the radio, handling, tires, pricing, colors, etc.
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09-10-2007, 08:49 AM | #44 |
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None!!! Too bad I like them both!!
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