twin turbo?
26 November 2006, 06:36 PM
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twin turbo?
has anyone done a twin turbo conversion?it looks as though it would be a really good conversion as the flat4 engine is pretty much two seperate engines with a shared crank anyway.i know it would add weight and **** would probably be a bit tight but im sure it would work pretty well
26 November 2006, 08:15 PM
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A quick search on google revealed one of these...
...twin turbos, fitted by Subaru, on the production line
...twin turbos, fitted by Subaru, on the production line
Last edited by FB Tuning; 26 November 2006 at 08:37 PM.
26 November 2006, 11:17 PM
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I have a Leggy GT-B Spec which is 290BHP with a manual box.
The power delivery is quite a bit different to a Impreza's, being the twin turbo, there's a pause between the primary and secondary turbo spooling up, ( known as the VOD - valley of death ) When on the secondary turbo, they are a very very quick machine ( faster than a new STi in 4th and 5th gears on boost )
They are not to everyones taste, as the turbo doesnt come on boost as quick as its baby brother.
Fuel economy is better on the twins than the Impreza's, I get 25mpg knocking about town, and 30 on the motorway.
The answer to your original question - has anyone ever done the conversion, its quite possible, but I cant think of any reason why any Impreza owner would want to transplant to a twin.
Impreza's are street machines, and Leggys are cruisers.
R7
The power delivery is quite a bit different to a Impreza's, being the twin turbo, there's a pause between the primary and secondary turbo spooling up, ( known as the VOD - valley of death ) When on the secondary turbo, they are a very very quick machine ( faster than a new STi in 4th and 5th gears on boost )
They are not to everyones taste, as the turbo doesnt come on boost as quick as its baby brother.
Fuel economy is better on the twins than the Impreza's, I get 25mpg knocking about town, and 30 on the motorway.
The answer to your original question - has anyone ever done the conversion, its quite possible, but I cant think of any reason why any Impreza owner would want to transplant to a twin.
Impreza's are street machines, and Leggys are cruisers.
R7
26 November 2006, 11:19 PM
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27 November 2006, 12:11 AM
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rapidseven-i meant run as two seperate turbo curcuits i.e. one turbo system for each bank of cylinders rather than a sequential turbo set up running both banks together
the twin turbo bug eye in that link looks like they have gone the complicated way about it
the twin turbo bug eye in that link looks like they have gone the complicated way about it
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27 November 2006, 12:56 AM
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The downfall of two separate turbo circuits is you'd need a pair of itty bitty turbos to get good driveability. As you only have 2 cylinders, of 1 litre of capacity to spin them. Otherwise it would be too laggy and give no benefit over a single turbo. Unless the engine capacity is increased to compensate (i.e 2.5 block).
Twin scroll is a good compromise as it combats the problem with uneven exhaust gas pulses (like a twin setup) by seperating them into two exhaust scrolls. So a larger TS turbo will respond like a smaller non TS one, but will have the extra flow capacity to maintain high boost at high revs.
Twin scroll is a good compromise as it combats the problem with uneven exhaust gas pulses (like a twin setup) by seperating them into two exhaust scrolls. So a larger TS turbo will respond like a smaller non TS one, but will have the extra flow capacity to maintain high boost at high revs.
27 November 2006, 01:11 PM
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27 November 2006, 06:19 PM
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Originally Posted by Shark Man
The downfall of two separate turbo circuits is you'd need a pair of itty bitty turbos to get good driveability. As you only have 2 cylinders, of 1 litre of capacity to spin them. Otherwise it would be too laggy and give no benefit over a single turbo. Unless the engine capacity is increased to compensate (i.e 2.5 block).
well skylines seem to get by ok with 1.3l per turbo
its not something im asking about with a goal to doing it,was just wondering
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