Twin Turbo Configurations

[Antisocial]

I'm not sure which one it is, but one of the new Porsches has a variable vane turbo that changes depending on engine speed. Similar to reverse thrusting on a aeroplane I guess to some extent.

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This is nothing new as my 2000 Nissan Patrol TDi had the same turbo setup, it was called 'variable nozzle' or something like that.

Also wasnt the Subaru liberty RB4 or whatever it was called a twin turbo, but the most recient model was a single turbo, that had more power and torque that the TT it replaced?

[Cagey]

the bugati isnt a v10 quad turbo

its a v16 quad turbo

[saleen]

I'm not sure which one it is, but one of the new Porsches has a variable vane turbo that changes depending on engine speed. Similar to reverse thrusting on a aeroplane I guess to some extent.

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This is nothing new as my 2000 Nissan Patrol TDi had the same turbo setup, it was called 'variable nozzle' or something like that.

Porsche, how dare they copy your Datsun Patrol,

If you took the time to read the article, it does mention the idea isn't new, but often heat has been an issue, which Porsche claim they've overcome.

[Goobz]

the bugati isnt a v10 quad turbo

its a v16 quad turbo

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The Bugatti is actually a W16. Not a V16.

Basically it is a similar design to a V16, but each bank of 8 cylinders also has a small offset(15 degrees I think) between the alternating cylinders.

The Golf VR6 had a similar design.

Chris

[Adam]

isn't the Bugatti Veryon running a sequential quad turbo setup? I could be wrong....1.4million for such a vehicle is a bit of overkill....gimme an F6 and a qtr of the amount for mods and I'll send the bloddy thing to the moon!!! 

Cheers Y'all

Darren

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The Veyron does use 4 turbo's, and is also a V10 I think?

I read somewhere the fuel consumption when youre flat out in the big girl, something ridiculous, like 3 litres per 1 klm!

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And flat out you'd cover that KM in about 9 seconds!

So that's 1L of fuel per 3 seconds!

[replicant]

Another option if you have the real estate is a supercharger AND turbocharger setup. This allows for the low engine speed boost, courtesy of the supercharger and it disengages when the turbocharger kicks in (with a fair bit of overlap). Superchargers use a lot of engine power to compress the intake flow at high speed whereas a turbocharger uses the otherwise wasted exhaust gas pressure to power the impeller...

I've seen this is a few modded Series 1 MR2s and in a race truck setup (although I haven't seen the particular truck for a while). The other advantage with a supercharger is that it is possible to run a two speed supercharger... come to think of it there's a two speed supercharger on the Merlin engine out of the Spitfire/Hurricane/P51D Mustang.

The other thing is that there are two kinds of supercharger the Lysholm-type screw supercharger... which uses two screws and the other is a Rootes style which uses is a single centrifugal turbine. The Rootes version is very similar in design to a single impeller turbocharger but uses the crankshaft to power it rather than the exhaust - but interestingly has low boost issues at low engine speeds... which the lysholm does not...

[Guest]

Replicant

Would this void warranty?

Darren

[loopism]

Roots blowers use two contra-rotating vanes to force air (in this case) into the engine. They aren't a compressor per se, as they rely on forcing more air than the engine is consuming into the manifold.

[replicant]

Well Dazza

It might depend on how you did the modifications... it would be certainly cheaper than buying a Veyron. Incidentally, apparently VW are absolutely hosing money on every single Veyron they sell like hundreds of thousands of dollars (mainly in R&D as well as the exotic materials)... apparently it's to show that they alone have technical superiority over every one else... it's still cheaper than most F1 programme annual budgets so who's looking stupid now, Toyota?

You can build the world's fastest car and have generations pining for it... or you can spend a fortune and get nowhere past mid field after several seasons... ask Ford (do you remember the Jaguar F1 Team course you don't), Alfa Romeo F1 Team, Lotus F1, Toyota are still only midfield, Honda have spent megabucks on what was BAR, BMW have spent a lot and aren't world champions, Peugeot spent money developing an F1 engine for McLaren and then got fired cos it was too slow... Renault have been champions before but hardly anyone remembers Alain Prost but everyone knows the Lambo Countach...

[Guest]

I guess when you use the Lambo Countach as an example, it will forever remain an icon due to the fact that it appealed to a population of people that could appreciate a 'road' drivable vehicle.

Whereas F1 status is a little out of reach for the day to day individual.

Darren