6262 twin scroll?
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From: USA
Originally Posted by RealStreet,Apr 8 2010, 12:32 PM
It's published in the Precision paper catalog where you can see on page 6 and 7 that the '62' turbine is 2.795" in / 2.437" ex (sorry that's 71mm not 72mm like I said previously) - 70.99mm / 61.90mm
If you're referring to the larger wheel's moment of inertia versus a smaller wheel I 100% agree, that's cut and dry the way it is. What I was more speaking to is if that is something that you consider important, then the ball bearing should be on your list of necessary items as well, as any turbocharger of a given size and given wheels will have better transient response, not to mention reliability over the same unit with a journal bearing.
The Garrett inducers are published in their catalog and also on www.turbobygarrett.com and I believe there are a few units on my website although they may be the larger ones such as the GT45, 47 and 55R product.
The 30R uses a 60mm inducer, which is noticably smaller than the 68mm GT35R, however with the S2000 the very steep / high ratio gearing helps offset the perceived lag from a larger turbocharger. It doesn't necessarily change boost threshold at all, just the gearing helps the car drive into boost better than something with the same engine and longer gears would.
I understand what you're saying about using watercooling and I agree that watercooling is good when it's available, however the majority of people purchasing turbochargers actually prefer not to have it, which is why you will see that PTE has gone exclusively to non-water-cooled cartridges, and Turbonetics offers nearly their full line in either 'dry' or 'wet' configurations. All I'm saying is that I wouldn't necessarily rule a turbocharger out due to it not having the watercooled cartridge available. Kind of like how buying an AEM EMS with onboard UEGO is a good idea, but almost NO ONE did it, so now every Series 2 box they are releasing doesn't have it as an option anymore - it doesn't mean that it was good, but it's not something that is 'necessary'. Hopefully you know what I mean.
If you're referring to the larger wheel's moment of inertia versus a smaller wheel I 100% agree, that's cut and dry the way it is. What I was more speaking to is if that is something that you consider important, then the ball bearing should be on your list of necessary items as well, as any turbocharger of a given size and given wheels will have better transient response, not to mention reliability over the same unit with a journal bearing.
The Garrett inducers are published in their catalog and also on www.turbobygarrett.com and I believe there are a few units on my website although they may be the larger ones such as the GT45, 47 and 55R product.
The 30R uses a 60mm inducer, which is noticably smaller than the 68mm GT35R, however with the S2000 the very steep / high ratio gearing helps offset the perceived lag from a larger turbocharger. It doesn't necessarily change boost threshold at all, just the gearing helps the car drive into boost better than something with the same engine and longer gears would.
I understand what you're saying about using watercooling and I agree that watercooling is good when it's available, however the majority of people purchasing turbochargers actually prefer not to have it, which is why you will see that PTE has gone exclusively to non-water-cooled cartridges, and Turbonetics offers nearly their full line in either 'dry' or 'wet' configurations. All I'm saying is that I wouldn't necessarily rule a turbocharger out due to it not having the watercooled cartridge available. Kind of like how buying an AEM EMS with onboard UEGO is a good idea, but almost NO ONE did it, so now every Series 2 box they are releasing doesn't have it as an option anymore - it doesn't mean that it was good, but it's not something that is 'necessary'. Hopefully you know what I mean.
Yes, ball bearings are defiantly one of the main considerations. Just to add to our dicussion I think it is also important to note the increase in exhaust gas acceleration through a smaller orifice when using a smaller wheel (Not to be confused with turbine A/R)
It is funny that you brought up gears, I am currently looking into putting in something close to a 3.80:1 final gear. I have too much gear now, 1st 2nd and 3rd all have been boost limited to help maintain traction.
I know exactly what you are talking about with the options. I however am the complete opposite, I was one of the few that got an EMS with integrated WB. As an ME I strive for the most integrated and fool proof designs with less emphasis on the cost but the people I sell my products only see $$$.
Thank You for taking the time to Post, we really need more posts from expreienced people like yourself.
Joined: Mar 2003
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From: Sellersburg, IN
I've heard that with the twin scroll's, you gain decent midrange but lose quite a bit of top end unless you go with a 1.15 A/R or higher turbine cover. But then, if you go with that high of an A/R turbine cover, you defeat the purpose of gaining in the midrange because you wont gain much there. I myself think the twin scroll's are a catch 22...........
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Originally Posted by Spoolin,Apr 9 2010, 04:48 PM
I've heard that with the twin scroll's, you gain decent midrange but lose quite a bit of top end unless you go with a 1.15 A/R or higher turbine cover. But then, if you go with that high of an A/R turbine cover, you defeat the purpose of gaining in the midrange because you wont gain much there. I myself think the twin scroll's are a catch 22...........
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