does everyone owning a tt auto seem to have a sweet spot on thier accelerator, I only ask because rather than pressing foot to floor fast when wanting to overtake, if i lightly press the pedal it seems different?, even when sat in traffic, the slightest press in the right place sends me hurtling forward.

 

 

just curious if other peoples feel like this?

 

 

cheers good people

 

 

 

jim.

Its not just autos.

 

With my manual when over taking I actually get more acceleration when I slowly press the pedal down.

I sometimes feel like that, but after a week or so i usually slam my foot to the floor and the car just flies, the sweet spot is defiently pedal to the metal.

Its defintaley quicker when pushed hard to the floor. But there does seems to be a 'sweet spot' in between

When you put your foot to the floor you are using the amount of air and fuel as if the engine was very high in the rev range, which can make the engine run worse as I understand.

 

 

Stuart

isnt it to do with the speed of the air through the throttles, ie less open = more air speed, until you are revving high.

I always find when overtaking and accelarating quickly it's better to have about 3/4 pedal until roughly 4500rpm then floor it, i have RLTC so i don't know if that would make a difference.

 

Rich

What i have found is :

floor it with overdrive OFF

when it gets to about 90/100 mph in 3rd, switch overdrive on and it picks up about 250 rpm and pulls even quicker!

Great for quiet motorways with scooby behind:D

Try it and let me know if yours does same

will do mate, im off out tommorow in the car but I always seem to be behind someone in the zed, I carn't seem to just cruise around.

 

think ill go for a blast down the motorway...

 

 

 

 

jim.:D

It's definitely true low down the revs range, and I can sort of understand why... the engine can't possibly use as much fuel at 2500 revs as it does at 7000, yet the throttle position sort of implies it's being fed just as much...

 

Spose the injector duty then compensates for that but I don't really understand how the throttle and the injectors are related... can someone explain? :confused:

 

On mine the AVC-R also copes much better if you're subtle but drive it hard, rather than slamming throttle on and off all the time. THinking about how fuelling / charging / intake all works it's amazing the bloody thing works at all let alone works after sudden changes of throttle!

 

...funny thing is I notice it in the TDI too and that's drive-by-wire so ought to compensate for that kind of thing...

 

(Old Pug 205 diesel used to do it too, that I entirely understand)

 

It's also a lot easier to get round corners if you're smooooooth!

Hi Jim

 

Mine behaves a little like this too (UK TT auto).

 

When overtaking from low speed (20-40mph) or pulling from lights quickly, about 3/4 to the floor gives best acceleration. Once 50mph is reached and the car is still flying, if I stuff the pedal into the carpet it REALLY moves....

 

........bye bye anything behind:D

 

that last bit of acceleration still comes as a (pleasant)surprise:cool:

 

Yet another reason I love these cars:dance:

 

Richard:)

The fuel maps compensate for both load and RPM, so the amount of fuel injected is correct for both conditions. That means at 2500rpm, the amount of fuel injected will rise dependant on throttle opening.

There is a throttle enrichment table which will enrich the mixture for a short time on opening, dependant on the angle the pedal is moved through and how quickly (like an accelerator pump on a carb). The idea of this is to give a quick 'blip' of fuel to get carried into the engine untill the air speed picks up enough to bring the rest in.

My guess would be that the effect is related to this, although I can't say I've ever noticed it on mine. Wonder if it's just because if you hit it once it's already spooling it feels so much more responsive that it tricks you into thinking it's faster?

I still think it is something to do with the speed of the air, ie big hole (wide open throttle) slow air speed,,,,, smaller hole, faster air speed.