AMV8 Throttle Response
Discussion
Now having done a couple of hundred miles in the car I've noticed that there seems to be a small delay in the throttle response (I noticed it on the other 2 I test drove too so must be a trait).
Anyone else noticed this - any tricks to stop bar changing my driving style ?
The 911 had a similar electronic throttle I think and never had any issues......just don't like the revving once I have depressed the clutch to change.
Seems to happen less when driving very gently..............
Anyone else noticed this - any tricks to stop bar changing my driving style ?
The 911 had a similar electronic throttle I think and never had any issues......just don't like the revving once I have depressed the clutch to change.
Seems to happen less when driving very gently..............
From a driving perspective, this is the worst part of the car IMO (the SatNav takes the overall, all categories, honours!!). Don't think there's much that can (or will) be done by AM. I believe the power pack cars/N400s might have a slightly tweaked response though...but from one I've tried it doesn't go far enough.
I reckon it's one of the reasons people complain of the car being "slow"...
I reckon it's one of the reasons people complain of the car being "slow"...
Both Prodrive and Paramount claim "improved throttle response" with their tuning packages via ECU remapping so that might be something to look in to if this bothers you enough. They may be able to alter the curve of the throttle position mapping this way. Worth a phone call ?
I didn't notice a great change when I drive a friend's Prodrive-modified car but it wasn't on the road, which is where I'd expect to feel the effect most (pulling out of junctions etc).
I didn't notice a great change when I drive a friend's Prodrive-modified car but it wasn't on the road, which is where I'd expect to feel the effect most (pulling out of junctions etc).
Murph7355 said:
From a driving perspective, this is the worst part of the car IMO (the SatNav takes the overall, all categories, honours!!). Don't think there's much that can (or will) be done by AM. I believe the power pack cars/N400s might have a slightly tweaked response though...but from one I've tried it doesn't go far enough.
I reckon it's one of the reasons people complain of the car being "slow"...
Agree I reckon it's one of the reasons people complain of the car being "slow"...
Remapping the throttle curve won't fix the inherent problem, which isn't throttle map aggression, it's the actual engine response to the pedal input. The problem I would guess could be either a slow throttle servo, slow internal network, or the throttle butterfly being placed too far away from the inlet ports? Perhaps a heavy flywheel?
Ideally this car really deserves BMW M division style ITBs, that'll sort it out! Or at least a pair of butterflies, one per bank, Ferrari style!
Having just one big butterfly doesn't really cut it at this level in my opinion. This might be why the DBS seems to suffer less so, although the slightly laggy trait is still there.
Ideally this car really deserves BMW M division style ITBs, that'll sort it out! Or at least a pair of butterflies, one per bank, Ferrari style!
Having just one big butterfly doesn't really cut it at this level in my opinion. This might be why the DBS seems to suffer less so, although the slightly laggy trait is still there.Edited by jus on Monday 5th January 08:56
I reckon this is caused by a large rotating mass within the engine. The engine is a cross plane v8 and consequently requries mass to be added to the crank to balance the forces. Couple this with a fairly aggressive cam profile and a larger flywheel may have been fitted to smoothen idle. It's a common problem on all cross plane v8's.
My throttle pedal feels fairly smooth and crisp actually. At least to my mind. If it's electronic in nature, then either the signal from the pedal to the throttle servo (via the internal network) is slow, or the reaction at the other end to the signal by the throttle servo is slow.
It's likely that the same throttle pedal box is used across the range of cars and the same or similar electronic network. But the DB9/DBS don't seem to have quite as pronounced a response lag. Thus it would appear more likely that it is something to do with the configuration of the engine and/or internal mass, than the electronics side, surely..?
It's likely that the same throttle pedal box is used across the range of cars and the same or similar electronic network. But the DB9/DBS don't seem to have quite as pronounced a response lag. Thus it would appear more likely that it is something to do with the configuration of the engine and/or internal mass, than the electronics side, surely..?
GPM3D said:
Does this just effect manual cars? Never noticed an issue with my Sportshift - just the ponder when using auto mode!
G
Should be the same on manual and SS, but mabye it depends where you are coming from. Having driven all those great M Division engines over many years with their ultrasharp throttle response and wonderful revingness, I found the throttle response of the Vantage quite a big dissapointment.G
I've just spoken to Paramount Performance about this. Their feeling was that a good fraction of the soft throttle response is down to throttle and ECU mapping and many of their customers remark on the improvement in this area. All the usual cautions apply but it is certainly a known issue.
It would be good to hear a first-hand report of this - or a drive a standard and a mapped car back-to-back. Also interesting to know whether the recently announced factory upgrades for the 4.3 address this problem.
It would be good to hear a first-hand report of this - or a drive a standard and a mapped car back-to-back. Also interesting to know whether the recently announced factory upgrades for the 4.3 address this problem.
Captain Beaky said:
I've just spoken to Paramount Performance about this. Their feeling was that a good fraction of the soft throttle response is down to throttle and ECU mapping and many of their customers remark on the improvement in this area. All the usual cautions apply but it is certainly a known issue.
It would be good to hear a first-hand report of this - or a drive a standard and a mapped car back-to-back. Also interesting to know whether the recently announced factory upgrades for the 4.3 address this problem.
It's certainly not been "cured" on the 4.7It would be good to hear a first-hand report of this - or a drive a standard and a mapped car back-to-back. Also interesting to know whether the recently announced factory upgrades for the 4.3 address this problem.
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