dazdot Posted July 20, 2005 Report Share Posted July 20, 2005 Saw a mitsubishi 3000GT twin turbo today. This got me wondering,is twin turbo 2 x same size turbos and if so, why this over 1 large turbo? Or is it 1 large and 1 small turbo. If the latter, does the small 1 do the work untill the larger 1 is upto speed? No real reason for asking this, just curious i suppose. Link to comment Share on other sites More sharing options...
Thorburn Posted July 20, 2005 Report Share Posted July 20, 2005 There are various possible implementations. You can have two equally sized turbos, this means you can equal the boost of one larger turbo but a smaller turbo can spool up to speed quicker than a large one and this helps reduce lag. Alternatively you can have one small and one large, the large giving the boost for peak power while the smaller one provides a small amount of boost lower down the rev range, again reducing the turbo lag at low revs. Link to comment Share on other sites More sharing options...
NewNiceMrMe Posted July 20, 2005 Report Share Posted July 20, 2005 Well it is 2 x same size Turbo's on a Noble, I know that much. Link to comment Share on other sites More sharing options...
dazdot Posted July 20, 2005 Author Report Share Posted July 20, 2005 [ QUOTE ] There are various possible implementations. You can have two equally sized turbos, this means you can equal the boost of one larger turbo but a smaller turbo can spool up to speed quicker than a large one and this helps reduce lag. Alternatively you can have one small and one large, the large giving the boost for peak power while the smaller one provides a small amount of boost lower down the rev range, again reducing the turbo lag at low revs. [/ QUOTE ] Thanks for that. I guess they must be 2 x on the mitsu as it says Twin turbo, not 2 turbo's. Link to comment Share on other sites More sharing options...
Avus_Bub Posted July 20, 2005 Report Share Posted July 20, 2005 [ QUOTE ] Saw a mitsubishi 3000GT twin turbo today. This got me wondering,is twin turbo 2 x same size turbos and if so, why this over 1 large turbo? Or is it 1 large and 1 small turbo. If the latter, does the small 1 do the work untill the larger 1 is upto speed? No real reason for asking this, just curious i suppose. [/ QUOTE ] It will also depend on engine cofiguration - ie V engines would almost definitely use the same size ( S4 RS4 RS6 ) for balance. Straight six engines however could use a small (for low revs) and large (for high) . I think I'm right in saying the 535d uses a small and large turbo for this reason. BUB Link to comment Share on other sites More sharing options...
Thorburn Posted July 20, 2005 Report Share Posted July 20, 2005 [ QUOTE ] Thanks for that. I guess they must be 2 x on the mitsu as it says Twin turbo, not 2 turbo's. [/ QUOTE ] Well both would still be called twin turbo. The BMW 535d is a 'twin turbo' but has two differently sized turbos. The Noble is too but has two identical ones. The Bugatti EB110 actually had quad turbos, which I presume was 2 pairs of 2 different sized turbos..... Link to comment Share on other sites More sharing options...
Mollox Posted July 20, 2005 Report Share Posted July 20, 2005 The 535d is technically Sequentially Turbocharged and not a "twin" or "biturbo" Twin/biturbo applications tend to serve opposite banks of cylinders I do believe Link to comment Share on other sites More sharing options...
dazdot Posted July 20, 2005 Author Report Share Posted July 20, 2005 This is starting to confuse me now! Link to comment Share on other sites More sharing options...
Thorburn Posted July 20, 2005 Report Share Posted July 20, 2005 [ QUOTE ] The 535d is technically Sequentially Turbocharged and not a "twin" or "biturbo" Twin/biturbo applications tend to serve opposite banks of cylinders I do believe [/ QUOTE ] True, but it still gets called 'twin turbo'. If I remember correctly the Skyline GTR was a straight-6 but that was sold as a Twin-Turbo, and the Toyota Supra was the same Link to comment Share on other sites More sharing options...
Mollox Posted July 20, 2005 Report Share Posted July 20, 2005 If I called a skyline a Cortina would it be a Cortina or a Skyline? Link to comment Share on other sites More sharing options...
Thorburn Posted July 20, 2005 Report Share Posted July 20, 2005 [ QUOTE ] If I called a skyline a Cortina would it be a Cortina or a Skyline? [/ QUOTE ] Well I guess it would be called a Skyline if thats what its called! It would depend on your authority, if you were the chief of car naming at Ford then I guess it would be a Ford Skyline, or maybe a Ford Cortina Skyline.... My brain hurts Link to comment Share on other sites More sharing options...
NewNiceMrMe Posted July 20, 2005 Report Share Posted July 20, 2005 [ QUOTE ] If I called a skyline a Cortina would it be a Cortina or a Skyline? [/ QUOTE ] If you called a Skyline a Cortina, surely it'd be a Mistake? Link to comment Share on other sites More sharing options...
Avus_Bub Posted July 20, 2005 Report Share Posted July 20, 2005 [ QUOTE ] The 535d is technically Sequentially Turbocharged and not a "twin" or "biturbo" Twin/biturbo applications tend to serve opposite banks of cylinders I do believe [/ QUOTE ] What about the BIG Jap stuff - Skylines and Supras? Don't the big boyz run two "train" sized turbos inline? Link to comment Share on other sites More sharing options...
Mollox Posted July 20, 2005 Report Share Posted July 20, 2005 Do you mean Cortinas?? Link to comment Share on other sites More sharing options...
NewNiceMrMe Posted July 20, 2005 Report Share Posted July 20, 2005 [ QUOTE ] Do you mean Cortinas?? [/ QUOTE ] No, surely he means the Nissan Mistake or the Ford Erroneous? Link to comment Share on other sites More sharing options...
Thorburn Posted July 20, 2005 Report Share Posted July 20, 2005 Re: Ford Cortina Skyline You could simply apply 'chavlogic' and not simply content with calling it a Skyline also add badges for 'GTI', 'GTR', 'Supercharger', 'Turbo', 'RS', 'M' and 'AMG'. This would create the Ford Supercharger Cortina RS Racing Turbo Skyline M GTR Turbo AMG GTI. It would produce 50,000bhp but 0-60 would be a leisurely 9 seconds and it would handle like a 911 on crack since to the sheer weight of the back end of it Link to comment Share on other sites More sharing options...
Avus_Bub Posted July 20, 2005 Report Share Posted July 20, 2005 [ QUOTE ] Do you mean Cortinas?? [/ QUOTE ] It's TOOOOOOOOOO late for this Sheet But my first car was a Yellow 2000E mkIII Cortina or Skyline if you prefer 110mph with NO turbo at all And the end to my RWD cars Link to comment Share on other sites More sharing options...
JamesB Posted July 20, 2005 Report Share Posted July 20, 2005 [ QUOTE ] If I called a skyline a Cortina would it be a Cortina or a Skyline? [/ QUOTE ] A rose by any other name would smell as sweet Link to comment Share on other sites More sharing options...
shark_90 Posted July 20, 2005 Report Share Posted July 20, 2005 [ QUOTE ] [ QUOTE ] If I called a skyline a Cortina would it be a Cortina or a Skyline? [/ QUOTE ] A rose by any other name would smell as sweet [/ QUOTE ] Don't you start... Link to comment Share on other sites More sharing options...
dazdot Posted July 20, 2005 Author Report Share Posted July 20, 2005 It was a mitsubishi i saw it on, not a cortina. Link to comment Share on other sites More sharing options...
JamesB Posted July 20, 2005 Report Share Posted July 20, 2005 Start what? Anyway, as I understand it, the two turbos on my car are the same size and it is simply a case of one for each bank of cylinders on the V8. Of course, if there is a rationale for providing one turbo per cylinder bank, it makes you wonder what sort of fun you could have with a W12. Link to comment Share on other sites More sharing options...
Thorburn Posted July 20, 2005 Report Share Posted July 20, 2005 [ QUOTE ] It was a mitsubishi i saw it on, not a cortina. [/ QUOTE ] This is however TSN, topics can and will meander like a river across an open plain Link to comment Share on other sites More sharing options...
Calm Chris Posted July 21, 2005 Report Share Posted July 21, 2005 Bi turbo means 2 x turbos, 2 manifolds, both turbo working to cover there 'own, bank of cylinders. Twin turbo is 2 x turbos working in tandem and feeding the same cylinders via the same manifold. That's what I thought. Link to comment Share on other sites More sharing options...
Soapsuds Posted July 21, 2005 Report Share Posted July 21, 2005 blimey! any one the wiser!!!??? the 3000 GT is a mitsi V6. The engine has twin manifolds and a turbo on each, both the same size! It has twin intercoolers and an oil cooler / normal rad - yep 4 rads in total!....... There is NO difference in twin turbo / biturbo - its just a manufacturers name basically! The Saab Aeros (hot's) are twin turbo, but dont really market it as such. These are cars with a small turbo to spool fast / reduce lag and big fat one to spool up for peak power! All on the same manifold..... There are a few others around like this too..... The 3000 GT replaced the Starion (see my sig - i have one incase you didnt know!) and they went the whole hog to try and benefit from the Starions image - but it was a bit of a naff car the 3000 GT. Very heavy, 4x4, 6 speed box and LSD BUT it wasnt what it should have been with 300-odd BHP and hence it flopped! Quite good for tuning though. Personally, my 4G63 derived Starion (same block as is in the EVO's now still) with one great big fat turbo is the best mitsi came up with, but i'm biased! Yes, it is very ON / OFf with nothing before 3500 rpm and its all over at 6500 rpm! BUT - its awesome when it kicks in...... Long winded, but hope that clarifies it for you my friend(s)! Link to comment Share on other sites More sharing options...
zchybrid Posted July 21, 2005 Report Share Posted July 21, 2005 [ QUOTE ] Anyway, as I understand it, the two turbos on my car are the same size and it is simply a case of one for each bank of cylinders on the V8. [/ QUOTE ] Unless the car runs two seperate throttle bodies (one for left and one for right cylinder head) then i wouldn't say the turbos are for each cylinder bank, you will proberly find that most V engines run 2 turbo's as they can easily run 2 smaller turbo's making the engine more efficient and in most cases less "laggy" than a larger single turbo which would have to be fitted a lot further down the exhaust system. Most non V engines i.e Nissan skyline, mazda RX7 use sequential turbo's, one is usually smaller and spools up with less exhaust pressure to reduce turbo lag which is caused by the low compression of the turbo engine, then at higher engine speed/load the larger turbo will spin up and run more boost than the smaller unit. Link to comment Share on other sites More sharing options...
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