2014 Mercedes Cla 45 4Matic Amg Vs Hsv Gen-F Gts

[aiboart]

Turbo makes power up to a predetermined level of boost which can be as low as 3000 rpm then it maintains that power all the way out to the shift point?

Note:

- threshold is related to engine RPM's, it where the turbo comes on boost

- lag is the time function that applies once the turbo once the boost threshold has been reached

Where the turbo comes on boost (the threshold) depends on the size and the design of the turbo and on the size of the engine driving the turbo. A little turbo has a low threshold but the turbo runs out of capacity at low power levels. A big turbo has a high threshold but also has higher power potential.

The current lower limit for a conventional turbo boost threshold is about 1,200 rpm. However, high-end variable vane turbo's (like a variable pitch prop - seriously expensive) can go-lower still whilst still maintaining high power capability. New e-turbo's (compressor driven by electric motors and using the 'turbo' turbine to generate electrical power that is stored in a battery etc. ) will have no RPM threshold.

As for the power delivery:

The ideal power delivery for driver control is when the turbo comes on boost and then the torque curve stays dead flat. (This is possible with turbo's because the computer systems give the boost an electronic haircut. With a turbo there is more than enough power potential to be able to do this.) The result is highly linear power delivery that enables the driver to maintain high levels of control in all conditions.

The ideal power delivery for turbo's for seat of the pants visceral thrills is a lumpy-spiky torque curve. This creates high rates of torque change and therefore high rates of acceleration change (jerk/jolt). The result is is the classic 'punch in the back' experience and tyre frying action.

Edited 05/10/13 01:32 AM by aiboart

[FPV TRANNY]

I love the way the supercharger has instant grunt but you cant go past turbo delivery.Would love to see a turbo Miami motor go.It would be interesting to see the torque and power delivery difference between the two.

[Spinning]

You can't deny the smile the whine of the supercharged coupled with that strong exhaust note... Nothing finner that cruising with the windows down and allowing your ears absorb the symphony which in turns puts a wide smile on your dial ... And you haven't got the thing wound up yet !!! Pure extacy.

[discostig]

Yeah they are great for making a gorgeous soundtrack but not needing to be going fast. Turbo is addictive but very much a time and place thing. Hard to sound good in stop start traffic with the muffled exhaust of the turbo Fords, especially auto.

[Barnesy]

I am loving the new AMG A45, 4.6 0-100 and 12.6 @112.5mph down the quarter with AWD and getting 6.9L/100km, apart from the 80k premium not a bad buy.

Rumours are there is a Black Edition to be released of the A45

[brettenator]

20% power loss from flywheel to wheels sounds about right, it's what my car got.

[Pete A]

I am loving the new AMG A45, 4.6 0-100 and 12.6 @112.5mph down the quarter with AWD and getting 6.9L/100km, apart from the 80k premium not a bad buy.

Rumours are there is a Black Edition to be released of the A45

This is a serious contender for my next car. Already talking to a dealer. Expect to drive one when he finally gets one in. Have seen one in Europe recently and it is the dogs bollocks. Bit small rear space (hatch model) but OK for what I want. If it goes like they say it will then break 5 secs with ease. IF there is a black edition I hope they don't spoil it. Ride qual on the blacks is too harsh. Interested to see what they will give me for my 6T as a trade to get me in to one.