ed
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Registered: 10th Sep 03
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You can tell it to make the throttle firmer to press?
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
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No you bring the peak position closer so the car feels perkier, or so when you're crusing your foot is in a different position, or so zero to full throttle isn't as far, all make the car feel different. The pedal isn't hard/soft the same as a cable pedal doesn't offer feedback when the engine is off. I couldn't tell the difference between cable or FBW just on pedal feel.
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SVM 286
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Registered: 13th Feb 05
Location: pain
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quote:
Originally posted by Sam
Can someone explain how this actually works, in comparison to the good old accelerator cable?
Sam, the throttle pedal is fitted with a potentiometer, this sends a signal to the throttle body actuator to tell it what position the pedal is at, as the pedal is moved, a stepper motor on the throttle body acts proportionately and adjusts the throttle butterfly accordingly.
Hope that made some sense mate. 
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Ojc
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Registered: 14th Nov 00
Location: Reading: Drives : Clio 197
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Fly by wire, oh dear oh dear oh dear oh dear.
I have it on my Coupe, its crap.
The car actually accelerates FASTER if you depress the pedal gradually rather than planting your foot, and the delay with it as well 
Rachel has it on her GSi, its slightly better but you have to get used to timing yourself with the pedal movements to when the turbo comes on boost.
Ian, how do you find it on the Cab Turbo?
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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the pedal is firmness is only determined by the spring under the pedal the cable has no bearing on the firmness of the pedal 
contrary to popular belief fly by wire is better than cable
[Edited on 23-06-2006 by Steve]
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ed
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Registered: 10th Sep 03
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It may be better on paper to a bunch of designers and engineers. But it reality it sucks balls. Especially in the Audi A4. You hit the gas to pull away at a roundabout. The car hesitates, then accelerates slower that my 1.2 Corsa. The situation is clearly not helped by the Tiptronic gearbox and the ESP but still 
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Ojc
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Registered: 14th Nov 00
Location: Reading: Drives : Clio 197
User status: Offline
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quote:
Originally posted by ed
It may be better on paper to a bunch of designers and engineers. But it reality it sucks balls. Especially in the Audi A4. You hit the gas to pull away at a roundabout. The car hesitates, then accelerates slower that my 1.2 Corsa. The situation is clearly not helped by the Tiptronic gearbox and the ESP but still
Funny you say that about the A4, I had a brand new Polo courtesy car and the hesitation with that pulling out of junctions was astonishing, it really was dangerous.
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ed
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Registered: 10th Sep 03
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Yea, my exact thoughts. This thing has a 1.8t engine and I neally got hit on a roundabout because it waited for a split second and wouldn't accelerate like it should. It's no good in real world traffic situations 
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Sam
Moderator
Premium Member
Registered: 24th Dec 99
Location: West Midlands
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quote:
Originally posted by SVM 286
quote:
Originally posted by Sam
Can someone explain how this actually works, in comparison to the good old accelerator cable?
Sam, the throttle pedal is fitted with a potentiometer, this sends a signal to the throttle body actuator to tell it what position the pedal is at, as the pedal is moved, a stepper motor on the throttle body acts proportionately and adjusts the throttle butterfly accordingly.
Hope that made some sense mate.
Yep cheers brother! 
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Sam
Moderator
Premium Member
Registered: 24th Dec 99
Location: West Midlands
User status: Offline
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quote:
Originally posted by Ojc
Fly by wire, oh dear oh dear oh dear oh dear.
I have it on my Coupe, its crap.
The car actually accelerates FASTER if you depress the pedal gradually rather than planting your foot, and the delay with it as well
My brother's mk4 Astra is exactly like that!
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
User status: Offline
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quote:
Originally posted by ed
It may be better on paper to a bunch of designers and engineers. But it reality it sucks balls. Especially in the Audi A4. You hit the gas to pull away at a roundabout. The car hesitates, then accelerates slower that my 1.2 Corsa. The situation is clearly not helped by the Tiptronic gearbox and the ESP but still
FBW is nothing to do with it, my car has the same FBW system and does not do this, its probably more to do with the ESP which quite frankly is crap in VAG cars,and produces exactly what you symptoms you state, i have it turned off at all times
[Edited on 23-06-2006 by Steve]
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Rob H
Member
Registered: 28th Oct 00
Location: Staffordshire Drives: Astra SRi
User status: Offline
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quote:
Originally posted by Steve
quote:
Originally posted by ed
It may be better on paper to a bunch of designers and engineers. But it reality it sucks balls. Especially in the Audi A4. You hit the gas to pull away at a roundabout. The car hesitates, then accelerates slower that my 1.2 Corsa. The situation is clearly not helped by the Tiptronic gearbox and the ESP but still
FBW is nothing to do with it, my car has the same FBW system and does not do this, its probably more to do with the ESP which quite frankly is crap in VAG cars,and produces exactly what you symptoms you state, i have it turned off at all times
[Edited on 23-06-2006 by Steve]
That combined with a rare phenomenon called turbo lag  .
FBW on the C's changes quite a bit from car to car. I know the 1.2's and 1.0's are much worse for it than mine is, althought there's still a noticable gap if your looking for it. Same goes for the clutches, mine feels very direct compared to the softer ones on the 1.2's. The 1.0 clutches are aweful  .
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Steve
Premium Member
Registered: 30th Mar 02
Location: Worcestershire Drives: Defender
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turbo lag isnt too bad in it as the 1.8 20v lump is quite nippy without the turbo anyway
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Rob H
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Registered: 28th Oct 00
Location: Staffordshire Drives: Astra SRi
User status: Offline
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quote:
Originally posted by Steve
turbo lag isnt too bad in it as the 1.8 20v lump is quite nippy without the turbo anyway
Wouldnt expect it to be bad, but there will still be some, which won't help matters . Normal 20v is proberbly fine, but this is effectively like having a 20v with a 6 foot inlet manifold on it .
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Ian
Site Administrator
Registered: 28th Aug 99
Location: Liverpool
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quote:
Originally posted by Ojc
Ian, how do you find it on the Cab Turbo?
Good, but then I'm so used to the car I wouldn't notice anyway. When it was chipped the pedal was very responsive indeed, stupidly so, but then the car was so damn fast it was a nightmare to drive anyway. Its back to standard now to get a bit more use out of the tyres and clutch, and to make the wet less of a gamble.
Its all custom and if you find a decent tuner who writes their own software you could tailor this. I've got another map for mine ready to go in which is less brutal when I get around to booking it in. More boost means you need to be more careful with the pedal to keep the journey smooth. To adjust the pedal but stay fairly standard boost etc. would be an expensive way of altering just that aspect of the car.
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Paul H
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Registered: 11th Aug 03
Location: Lincoln.
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i drive alot of dbw cars and can't tell the difference tbh.if anything the dbw is better.wasn't as good on my corsa as it is on my R though
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ed
Member
Registered: 10th Sep 03
User status: Offline
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quote:
Originally posted by Steve
quote:
Originally posted by ed
It may be better on paper to a bunch of designers and engineers. But it reality it sucks balls. Especially in the Audi A4. You hit the gas to pull away at a roundabout. The car hesitates, then accelerates slower that my 1.2 Corsa. The situation is clearly not helped by the Tiptronic gearbox and the ESP but still
FBW is nothing to do with it, my car has the same FBW system and does not do this, its probably more to do with the ESP which quite frankly is crap in VAG cars,and produces exactly what you symptoms you state, i have it turned off at all times
[Edited on 23-06-2006 by Steve]
I tried it with the ESP turned off, though I guess it was still turned on slightly as Audi's don't let you crash them without putting up a fight... I think the main flaw was the stupid gear box. Automatics suck.
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