Twin Turbo vs Bi-Turbo
Discussion
Twin turbo engines have two identical turbos which work together and do half the work each.
Bi-Turbos have a small low inertia turbo for low rpm and a large one for higher rpm. My last car was a bi-turbo diesel and the first turbo came in at 1200rpm and the second at about 2000rpm. Obviously slightly different to a big petrol bi-turbo, but the surge from almost at tickover was very nice indeed.
ETA: Just before I get slated by the bi-turbo diesels don't exist brigade. This was my last car:
Peugeot 607 2.2 HDi (Twin-Turbo)
Bi-Turbos have a small low inertia turbo for low rpm and a large one for higher rpm. My last car was a bi-turbo diesel and the first turbo came in at 1200rpm and the second at about 2000rpm. Obviously slightly different to a big petrol bi-turbo, but the surge from almost at tickover was very nice indeed.
ETA: Just before I get slated by the bi-turbo diesels don't exist brigade. This was my last car:
Peugeot 607 2.2 HDi (Twin-Turbo)
Edited by Pannywagon on Tuesday 12th October 11:53
Pannywagon said:
Twin turbo engines have two identical turbos which work together and do half the work each.
So why are both the RX7 and Supra "Twin turbo" and sequential?As I stated above, bi/twin as a model designation infers nothing about the operation of said turbos, merely that the car has 2 turbos!
Marf said:
Pannywagon said:
Twin turbo engines have two identical turbos which work together and do half the work each.
So why are both the RX7 and Supra "Twin turbo" and sequential?As I stated above, bi/twin as a model designation infers nothing about the operation of said turbos, merely that the car has 2 turbos!
Pannywagon said:
Twin turbo engines have two identical turbos which work together and do half the work each.
Bi-Turbos have a small low inertia turbo for low rpm and a large one for higher rpm. My last car was a bi-turbo diesel and the first turbo came in at 1200rpm and the second at about 2000rpm. Obviously slightly different to a big petrol bi-turbo, but the surge from almost at tickover was very nice indeed.
ETA: Just before I get slated by the bi-turbo diesels don't exist brigade. This was my last car:
Peugeot 607 2.2 HDi (Twin-Turbo)
The 1.9 that GM/Fiat share can also be twin-turbo'd. I think so far only Saab have used it this way though.Bi-Turbos have a small low inertia turbo for low rpm and a large one for higher rpm. My last car was a bi-turbo diesel and the first turbo came in at 1200rpm and the second at about 2000rpm. Obviously slightly different to a big petrol bi-turbo, but the surge from almost at tickover was very nice indeed.
ETA: Just before I get slated by the bi-turbo diesels don't exist brigade. This was my last car:
Peugeot 607 2.2 HDi (Twin-Turbo)
Edited by Arese on Tuesday 12th October 12:53
doogz said:
Pannywagon said:
Marf said:
Pannywagon said:
Twin turbo engines have two identical turbos which work together and do half the work each.
So why are both the RX7 and Supra "Twin turbo" and sequential?As I stated above, bi/twin as a model designation infers nothing about the operation of said turbos, merely that the car has 2 turbos!
Pannywagon said:
Twin turbo engines have two identical turbos which work together and do half the work each.
Bi-Turbos have a small low inertia turbo for low rpm and a large one for higher rpm. My last car was a bi-turbo diesel and the first turbo came in at 1200rpm and the second at about 2000rpm. Obviously slightly different to a big petrol bi-turbo, but the surge from almost at tickover was very nice indeed.
ETA: Just before I get slated by the bi-turbo diesels don't exist brigade. This was my last car:
Peugeot 607 2.2 HDi (Twin-Turbo)
You realise that your link describes your 'Bi-turbo' car as a 'Twin-Turbo'?Bi-Turbos have a small low inertia turbo for low rpm and a large one for higher rpm. My last car was a bi-turbo diesel and the first turbo came in at 1200rpm and the second at about 2000rpm. Obviously slightly different to a big petrol bi-turbo, but the surge from almost at tickover was very nice indeed.
ETA: Just before I get slated by the bi-turbo diesels don't exist brigade. This was my last car:
Peugeot 607 2.2 HDi (Twin-Turbo)
Edited by Pannywagon on Tuesday 12th October 11:53
Marf said:
Pannywagon said:
Twin turbo engines have two identical turbos which work together and do half the work each.
So why are both the RX7 and Supra "Twin turbo" and sequential?As I stated above, bi/twin as a model designation infers nothing about the operation of said turbos, merely that the car has 2 turbos!
The 300zx, (like mine), and cars like Mitsubishi 3000 GTO are vee configuration engines so have the exhausts at either side of the engine so have a turbine serving each bank. Plumbing in a sequential system wouldn't be impossible, but it would be very complicated and no doubt expensive.
Edited by Big Rod on Tuesday 12th October 12:05
Pannywagon said:
Twin turbo engines have two identical turbos which work together and do half the work each.
Bi-Turbos have a small low inertia turbo for low rpm and a large one for higher rpm. My last car was a bi-turbo diesel and the first turbo came in at 1200rpm and the second at about 2000rpm. Obviously slightly different to a big petrol bi-turbo, but the surge from almost at tickover was very nice indeed.
ETA: Just before I get slated by the bi-turbo diesels don't exist brigade. This was my last car:
Peugeot 607 2.2 HDi (Twin-Turbo)
Where did you get that information from? Bi and Twin are just two words for the same thing, and as far as I can see, it just depends on which way the manufacturer wants to tell their customers that the car has two turbo's. Bi-Turbos have a small low inertia turbo for low rpm and a large one for higher rpm. My last car was a bi-turbo diesel and the first turbo came in at 1200rpm and the second at about 2000rpm. Obviously slightly different to a big petrol bi-turbo, but the surge from almost at tickover was very nice indeed.
ETA: Just before I get slated by the bi-turbo diesels don't exist brigade. This was my last car:
Peugeot 607 2.2 HDi (Twin-Turbo)
Edited by Pannywagon on Tuesday 12th October 11:53
RicksAlfas said:
Surely "Bi" just means two.
Doesn't matter if they are sequential or not.
Many V-engines will use this setup with one turbo on each bank like he Merc the OP mentions, or indeed the Maserati Biturbo!
+1Doesn't matter if they are sequential or not.
Many V-engines will use this setup with one turbo on each bank like he Merc the OP mentions, or indeed the Maserati Biturbo!
There are many people making assumptions based on the cars they know of.
If you are told a cow has four legs, and you see an animal with four legs you can't assume it's a cow.
There are a number of older bi-turbo cars that I'm sure don't have sequential turbos, such as the 1980/90 Maserati biturbos.
Surely bi/ twin purely identifies the number of turbos and not their configuration.
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