Weird thing with the brake and revs.

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LANDO

LANDO

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Landokarl
I discovered a weird thing, yesterday I was doing some test on time trials, and I realized that when yo push the brake (it doesn´t happen until the red bar of the brake reaches the top) the revs go from 900 rpm to 1200 rpm, is there any logic or is a bug.

I have just realized that only happens with the GT-R
 
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I would guess that would have something to do with the auto clutch kicking in, the car brakes better with the engine still engaged but the clutch has to kickin before it cuts out.
 
I think same happens with SL55. Both cars are sequential, maybe that's why?
 
The Evo X/Tuned does this, too. If you stop, apply the brakes fully, the revs jump (and you can see the turbo engaged more than usual). However, if you apply the E-Brake the turbo and revs subside. It might be the autoclutch thing as the above posted, but I don't know enough about it to say anything.
 
A lot of sequential/double clutch cars 'blip' or rev higher to engage smoother downshifts. Sort of like heel-toeing in a manual. I have not noticed this but will have a look.
 
It happens with the modern cars with all sorts of computer crap. The nissan gtr, the evo x(and tuned), ferrari california, and any other cars with sequintial shifting.
 
This type of paddle-shift system fitted to race and rally cars should not be confused with most of the current crop of so-called paddle-shift systems fitted to some high-end road cars. More often than not, these systems are nothing more than conventional automatic transmissions which allow driver input to select the gears.
http://en.wikipedia.org/wiki/Sequential_manual_transmission
 
BMfan: F430, GTR, EVO X and other sports cars use real sequential transmission, not classic AT with hydroclutch. And all those sequential transmissions blip the throttle before downshift, as well as some classic AT's in sporty cars (SL55,IS-F). And new Nissan 370Z has this downshift throttle blip even for manual transmission with clutch!
 
Yep, ReBaron is right, it's the same in our diesel Seat with its DSG gearbox. It's actually two gearboxes, one with the odd gears and one with even. The car has always got the next gear ready so the changes are faster than anything a human can do. I believe the GTR uses more or less the same concept.

This is completely different to the conventional torque-converter set-up.
 
They are still not true sequential,for me a true sequential is fitted to the ascari A10 where you only use the clutch to pull away and you have a shifter next to you to go up and down the box.
I know what the DSG box is and i would still rather have a manuel.
I know the feeling when you are on a pass and you just get the corners and shifting right for just about every corner it feels great,its not the same with a manumatic.
 
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You guys are just confusing terms. BMfan is right in that none of these cars have sequential gearboxes, but wrong in that they are not just automatics that you select the gear.

A sequential gearbox, like BMfan said in the A10, and on motorcycles is just a manual set up for a forward-back shift motion. In most cases it still has clutch pedal (although usually not used for gear changesin race cars) and a forward-back stick shifter that moves sequentially through gears.

GT-R, F430, R8 have Semi-automatic gearboxes, not sequential. They are manual gearboxes, not automatic planetary gearboxes like BMfan said, and have clutches, not torque converters. The clutch is just actuated by a computer instead of your left foot.
 
my first post was taken out of wiki in case people thought i was typing crap.
I know the F430\F360 ,M3 ,M5\6 are not automatic planetary gearboxes,but the so called SMG boxe's that come in the normal 330i are auto's with paddle shifters.
 
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Maybe when you come to a stop and hold the brakes, it tries to engage some kind of launch control ;-) Man, would that make life easy at the 400m. If PD wanted GT5 to be REALLY real, they would make the GT-R's trans fail randomly between 5 and 105 launches and cost 25,000cr to fix.

Everyone is going to dual clutch now. Porsche and BMW have good ones on top of all of the others mentioned. Sequential is fast, but extremely harsh for a road car. Dual clutch has no percievable disadvantage to sequential, except perhaps strength in very high power applications.

Do not classify dual clutch gearboxes anywhere close to planetary/hydraulic automatics.
 
Fredzy
Do not classify dual clutch gearboxes anywhere close to planetary/hydraulic automatics.
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I don't,i actually like the BMW's tranny
I just want people to realize that every gearbox that has a paddle shifter isn't a proper sequential gearbox most of them are computer controlled manuels.
 
You mean computer controlled automatics right?
My dads 335i has the auto with the paddels and they are deffinetly just a auto with forced gear changes, takes around 500rpm at WOT to change gears.
 
GT-R and other mentioned cars have either DCT or similar fancy gearbox. The GT-R's tranny just disengages the clutch when the car isn't moving to avoid unnecessary wear of the clutch packs and prevent the oh-so-annoying creeping. In addition, if GT-R etc would have specific damage, then Z06 should be able to loose it's roof, blow the diff and/or engine, F430 should catch fire and Merc stop moving altogether since the computers won't allow you to drive it in sporty manner. :lol:
 
BMfan
They are still not true sequential,for me a true sequential is fitted to the ascari A10 where you only use the clutch to pull away and you have a shifter next to you to go up and down the box.
I know what the DSG box is and i would still rather have a manuel.
I know the feeling when you are on a pass and you just get the corners and shifting right for just about every corner it feels great,its not the same with a manumatic.
Click to expand...

Well, everyone has the right to an opinion and yes I see what you mean about a sequential box, but I find the DSG to be excellent. For example, I drove through the Pyrenees when we first had the car and decided to see how it drove under pressure. Within a few seconds the car realised what I was doing and was always in the right gear, in fact it did everything so well and so fast it felt like one continuous surge of power. I also liked the way it blipped the throttle on down shifts. I was surprised how well it did the corners and how "sweet" it felt.

While I haven't driven a GT-R in real life, the game does remind me of the sensation of driving a DSG.

OK, now confession time, while the Mrs has got a DSG, my car's a manual :-)
 

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