Completely mad car change?!

[Jonnycoupe]

It's also completely nonsensical in that usually the small turbo starts all the hard work before the larger one takes over. The small one would be at, if not beyond boost by the time the larger 1st turbo was maxed out.

Or it has a diverter valve to manage the airflow and subsequent pressure delta in order to lower the engine boost threshold and hence give the customer good response.... or indeed the large turbo comes on song prior to the small such that at higher airflow the small turbo compressor is not required to provide any pressure boost.

which is of course exactly what it does do and what OEMs have been doing for years.

Possibly just a typo or the higher flow turbo is simple smaller as it doesnt have variable vane tech./

 

[breathe3asy]

Fiesta ST 2013 or newer - its like an E46 M3 same amount of fun

 

[SupraWez]

Same as a Toyota Supra, the smaller turbo spools really quickly and then the bigger turbo kicks in as it takes longer to spool.

If you are referring to a MKIV Supra you are mistaken, both turbos are the same size, the 2nd turbo feels larger as the system runs sequentially.

All exhaust gas/energy to turbo 1 initially, then some exhaust energy is used to pre-spool, charge the second turbo and then the 2nd turbo is brought online, its controlled via the ECU and three VSV valves, a very clever system for its time, you can clearly see the system in action on stock dyno plot

 

[acemastr]

Fiesta ST 2013 or newer - its like an E46 M3 same amount of fun

I think we need to talk about your understanding of cars...

 

[breathe3asy]

I think we need to talk about your understanding of cars...

Says the guy who can't handle anything quicker than a R6

 

[acemastr]

Says the guy who can't handle anything quicker than a R6

That was a weird statement

 

[Six6siX]

If you are referring to a MKIV Supra you are mistaken, both turbos are the same size, the 2nd turbo feels larger as the system runs sequentially.

All exhaust gas/energy to turbo 1 initially, then some exhaust energy is used to pre-spool, charge the second turbo and then the 2nd turbo is brought online, its controlled via the ECU and three VSV valves, a very clever system for its time, you can clearly see the system in action on stock dyno plot

Was just about to say the same thing!

Though I recall you can change the sequential running mode to a parallel by changing a few hoses!

 

[SupraWez]

Was just about to say the same thing!

Though I recall you can change the sequential running mode to a parallel by changing a few hoses!

Indeed you can, sometimes called true twin conversion, you can also wire up switch up to the VSV and have it electronically controlled but to be honest its only normally done to test that both turbos are running OK, in parallel you lose the quick response of the sequential system.

 

[Roland Butter]

Madness, have you got a disorder that you get bored with a car much more readily than a normal human bean ?

ABTD [Automotive Boredom Threshold Disorder ]

Mmm, yes I like it, can I have a doctorate for inventing a
dodgy psycho-disorder please ?

BTW I bought a new Jag XF, love the interior, underwhelmed by the shape.