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Discussion Starter #1
I was just curious to get a concenious of peoples driving styles as far as shifting. I myself never lift between gears, unless I miss that gear change. When I use nitrous I usually shift a little short, because the engine flairs a little between shifts.


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Edited by - HRD_Tiburon on 02/04/2002 6:02:16 PM
 

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How I drive really depends on the location and situation. You say you never lift between gears, is that still true when you are using the nitrous?


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Discussion Starter #4
I don't lift between gears for nitrous either, I do short shift, so that when the engine does flair it doesn't hit the rev limiter. Normally it doesn't go 500 rpm over between shifts. Lifting is tough on the engine dynamics, you have a heavy flywheel thats driving the excitations and a closed throttle body resisting. Think of a button with a string run through wind it up and watch the oscellations that the button goes through unwinding, the button will oscellate one direction and then the other. Thats what the crank does buy letting off and shifting. When shifting and not letting off your using the inertia or stored energy of the flywheel to aid in acceleration and to dampen out extreme driveline torsionals.



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Edited by - HRD_Tiburon on 02/04/2002 8:46:42 PM
 

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<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>The engine flares during shifts...try a double clutch! It doesnt only work on downshifting, where you slow the gearbox's components and match their speed and rotating inertia to the engine, it works when upshifting too, except this time you're speeding up the box's rotating components to where the gears will mesh smoothly at a higher rpm...you just have to be that much faster, and not lift at all.


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Flat changes are better, you gotta be quick though or you bounce off the rev limiter and burn the clutch up.<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


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When accelerating as fast as possible I never lift between 1-2, 2-3, or 3-4. I do short shift at about 6300 - 6350 rpm, to prevent the engine from hitting the revlimiter.
Launching is done by subtle clutch/throttle work from about 2500 rpm. The tyres only squeek for a moment and then hook up. (At least that's the general idea <img src=/images/forums/snitz/smile.gif width=15 height=15 border=0> )

Top speed at the end of 3rd gear is about 85 - 90mph.

Ofcourse during normal driving on the highway I shift like an old granny. After 87.000 km the car is still on the original clutch and gearbox...




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I lift between shifts. Saves wear on the tranny (the crank can handle it, it was designed to; the tranny was desgined to be shifted and is really weak anyways), and stops engine damage from hitting the limiter.

I did try shifting w/o lifting, and now i need a new clutch (basically ripped mine in two, the full story here: http://www.hyundaiperformance.com/forums/snitz/topic.asp?t=6638 ). Not sure if the clutch was defective or not tho, but its enough to make me stop.


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Discussion Starter #9
I have never used nitrous on my Hyundai yet, but other vehicles, it defeats the use of nitrous if your squeezing, then you close the throttle and shut it off and then open the throttle and shoot it again. I grew up around drag racers that use to run Super Shifters, basically a drag race organization for stick shift only full bodied cars, similar to nostalgia superstock. They never did let off, they always told me letting off is grandma shifting. Hitting a rev limiter is not going to blow your engine up, only if your running nitrous without a RPM cut out switch. To be quick you have to shift with your wrist and fingures, the upper arm muscles react to slow. To see the difference flip your wrist, then try the same direction with your arm.


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