Delay on throttle being deployed from standing start

[Delmonte]

Since my clutch thread I thought I'd revisit this annoyance I have with the clutch / throttle interplay on the 4200 CC (facelift).
my issue is not throttle response as such. It's more that when you engage first from a standstill then foot off brake and floor the throttle, it's like there's an electronic limiter on the throttle, nothing seems to happen for a second or so if you use what the car seems to think is too much throttle (it's not msp by the way. No msp light). I hate this. The only way round it is msp off, left foot brake, then rev, then release brake (which is erm "dramatic" and usually lights up the back tyres and I don't like doing that either. At least not daily....)
I've been told by some there is adjustment available in the clutch software?
I've also been told 'they all do that and there's nothing you can do'.
I've been told the Gransport doesn't do it?
But I've also been told the Gransport is the same?
And would the FD dbw module improve this at all?

Anyone know the truth here?
And do you all know what I'm on about or have I lost my marbles?

 

[Wanderer]

QPV DS here - same thing sort of, having nothing like that - always instant.....

 

[CatmanV2]

PIS is wrong or something similar. My 4200 was not like that. Scalded cat springs to mind.

C

 

[Scaf]

I imagine it’s a weakness in the clutch or clutch adjustment. I say this as I had the same on my GTS and assumed it was normal, the Strad is completely different, the clutch and “get go” is instant.
I know that my GTS was fitted with a clutch after I traded it.

 

[RobinL]

No delay on mine. Into drive. Accelerate. And away!?

Sent from my ONEPLUS A5010 using Tapatalk

 

[CatmanV2]

Was thinking about this. If the revs aren't rising instantly I think it's more likely pedal pot or throttle body.

But fundamentally something needs fixing

C

 

[spkennyuk]

Since my clutch thread I thought I'd revisit this annoyance I have with the clutch / throttle interplay on the 4200 CC (facelift).
my issue is not throttle response as such. It's more that when you engage first from a standstill then foot off brake and floor the throttle, it's like there's an electronic limiter on the throttle, nothing seems to happen for a second or so if you use what the car seems to think is too much throttle (it's not msp by the way. No msp light). I hate this. The only way round it is msp off, left foot brake, then rev, then release brake (which is erm "dramatic" and usually lights up the back tyres and I don't like doing that either. At least not daily....)
I've been told by some there is adjustment available in the clutch software?
I've also been told 'they all do that and there's nothing you can do'.
I've been told the Gransport doesn't do it?
But I've also been told the Gransport is the same?
And would the FD dbw module improve this at all?

Anyone know the truth here?
And do you all know what I'm on about or have I lost my marbles?

Sounds very much like your PIS (Point of initial slip) is way to high.

Find your self a quiet flat road or car park put the car in sport mode and do the following :

Select first gear, watch the rev counter slowly increase the revs until the car starts to move and note the revs required to get the car moving.

I suspect what you will find is that the car will not start to move until 1700 to 1900 revs. This indicates that the PIS needs adjusting down. If its set up correctly the car will start to move around 1100/1200 revs pretty much as soon as you touch the loud pedal.

Basically you want the PIS dialing down as low as you can without the clutch dragging at idle.

Its not that the GS doesnt do it and the 4200 does. Either car can have the same issue if the clutch PIS point is not very well set up.

 

[Delmonte]

Thanks everyone, all really good input. I'm starting to think it's just something that they all do. Stuart I did your tests.
The car actually starts moving at sub 1000 rpm. I probably wasn't describing it very well before, but what actually happens is, it feels more like the throttle isn't listening to your input from your foot, so you Floor it but you only get little response until about 1500rpm, then the revs scream up if your foots still down. It feels like the throttle is being limited electronically while it feeds the clutch in. Which would match what you're saying about full clutch engagement around 1700 rpm.
This also matches what I was saying about revving hard while left foot braking, then dumping the brake, it really shifts off the line then! (though it makes you look a **** lol)
Going from only ever driving fully manual cars I really felt it when I first got the car..

I wonder... Would the fd throttle kit alter this...?
I suppose what I'm wanting is faster clutch engagement, while getting rid of the throttle being electronically limited at low revs (if indeed it is?)

 

[CatmanV2]

it feels more like the throttle isn't listening to your input from your foot

Hence my (second) comment. Something is not right. Forget about the FD kit until you find out what's wrong here. Could be something really simple like worn tracks on the bottom end of the pedal pot, or something making the throttle butterfly stick.

It's not limited. It's not working correctly (yet)

C

 

[Oneball]

The below isn’t correct:

FD kit just changes the relationship between pedal position and throttle body position. So for example instead of pedal being 1/2 depressed and throttle 1/2 open. Pedal is 1/2 pressed and throttle 3/4 open. Basically if you push the pedal faster and further you’re having the same effect.

 

[Zep]

FD kit just changes the relationship between pedal position and throttle body position. So for example instead of pedal being 1/2 depressed and throttle 1/2 open. Pedal is 1/2 pressed and throttle 3/4 open. Basically if you push the pedal faster and further you’re having the same effect.

It’s not quite like that. It tells the TCU that the engine speed is higher than it is, making it do faster gear changes at lower rpm.

Catman is right, there is something not quite right here. You need to have it plugged in and the details read, it could also be a sticking release bearing, hydraulic pressure pushes it in, clutch spring pressure pushes it out, so weak spring pressure, bearing sticking on the shaft, PIS. It needs looking at.

 

[Oneball]

It’s not quite like that. It tells the TCU that the engine speed is higher than it is, making it do faster gear changes at lower rpm.

Catman is right, there is something not quite right here. You need to have it plugged in and the details read, it could also be a sticking release bearing, hydraulic pressure pushes it in, clutch spring pressure pushes it out, so weak spring pressure, bearing sticking on the shaft, PIS. It needs looking at.

Didn’t realise it changed the box actuation as well.

 

[CatmanV2]

Didn’t realise it changed the box actuation as well.

It's much cleverer than things like a throttle commander. It spoofs data to the CAN like pedal depression and RPM

C