bmw twin scroll twin turbo
#21
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a very basic idea is that there are veins that stay closed in low rpm operation to spool the turbo quickly like a smaller turbo, but then they open up in the upper rpms to produce big power like a larger unit. I'm not 100% on the technology so if I am off a bit, I'm sure some one will come along and correct me
edit, found this on a turbo forum:
edit, found this on a turbo forum:
thanks guys. Sounds like an awesome innovation for turbos. That BMW gets the torque kicking in right away, damn close to a PD blower!!
I have been leaning towards a PD blower for my GTO because i use it on the street, and like the instant hit of torque. However, if these twin scroll turbo's can be used on a GTO turbo kit, then i would go that direction possibly.
The results are kick ***!!
Has anyone used these turbos on out cars? Are these turbo's expensive as compared to the regular turbo's?
#22
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
thanks guys. Sounds like an awesome innovation for turbos. That BMW gets the torque kicking in right away, damn close to a PD blower!!
I have been leaning towards a PD blower for my GTO because i use it on the street, and like the instant hit of torque. However, if these twin scroll turbo's can be used on a GTO turbo kit, then i would go that direction possibly.
The results are kick ***!!
Has anyone used these turbos on out cars? Are these turbo's expensive as compared to the regular turbo's?
I have been leaning towards a PD blower for my GTO because i use it on the street, and like the instant hit of torque. However, if these twin scroll turbo's can be used on a GTO turbo kit, then i would go that direction possibly.
The results are kick ***!!
Has anyone used these turbos on out cars? Are these turbo's expensive as compared to the regular turbo's?
i believe the only full VNT gas turbo car to date is the 997TT
honda/acura has one that is more an on off switch and doesn't really count
#25
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the car produces full boost from 1500 to 5750RPMS, and after that boost DROPS until it reaches its lowest point at 6000rpms, which happens to be where the car makes its max HP. So point is, the car is making low-end and midrange of a 600+ hp car.
And it makes sense for the n/a base engine not to have the power youre expecting, 4.4liter v8 with 9.3:1 cr, sounds about right to me or?
#26
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no, i read your post allright, but it seems to me when boost drops of so much (to get that unrealistic low power) after 5700rpm, it would not make peak power at 6000 ![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
Don't get me wrong i really like bmw engine design, as a matter of fact, i'm building and installing a bmw m5 turbo engine myself![Engarde](https://ls1tech.com/forums/images/smilies3/engarde.gif)
i would expect the lower compression 4.4 v8 - 32v base engine to make about 280-300hp
![Grin](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_grin.gif)
Don't get me wrong i really like bmw engine design, as a matter of fact, i'm building and installing a bmw m5 turbo engine myself
![Engarde](https://ls1tech.com/forums/images/smilies3/engarde.gif)
i would expect the lower compression 4.4 v8 - 32v base engine to make about 280-300hp