20B + 2x GT35R
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Joined: Feb 2001
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From: Czech Republic [www.rx7cz.net]
20B + 2x GT35R
Hi
I have finished 3rd drifting season with my FC with 20B + GT35R and for next season i plan on building FD.
I have to build new manifold and i possibly have another GT35R at shelf, which i can use.
One is T3 1.06, another one is T3 0.84 A/R....
Would it be possible (and make any sense) to run 2x GT35R on 20B and how would you route it/build manifold?
Thanks for any ideas
I have finished 3rd drifting season with my FC with 20B + GT35R and for next season i plan on building FD.
I have to build new manifold and i possibly have another GT35R at shelf, which i can use.
One is T3 1.06, another one is T3 0.84 A/R....
Would it be possible (and make any sense) to run 2x GT35R on 20B and how would you route it/build manifold?
Thanks for any ideas
I'm not entirely sure if it would be doable with the space constraints of the FC's stock framework, but I can give you some suggestions.
1. The manifold would most likely be a 3d version of the following ascii diagram: |Y|
The front rotor would feed one GT35, mounted rather low while the rear rotor would feed the other GT35, mounted higher up and closer to the rear. As for the middle rotor, it would be split between the two.
2. Flow dynamics aren't my area of expertise, but I would assume that depending on pipe routing and turbo placement, the front turbo would have shorter runners than the rear turbo. I believe it would make the most sense to have the quicker-spooling turbo on the shorter runners so it can get up to speed as quickly as possible.
3. As turbo efficiency maps are a bit over my head, both turbos would have to operate at the same boost pressure to not over-run each other without some form of check valves. A/R's and Airflow vs pressure are way out of my knowledge base, but I do know that people running twin fuel pumps encounter a similar issue when compared to a large single pump. Aaron Cake would be better equipped to answer questions such as this than I am.
4. Are you planning on a sequential setup or running them in parallel? How are you planning to merge their outlets together before the intercooler? Downpipe routing? Wastegates? Intakes & air filters?
1. The manifold would most likely be a 3d version of the following ascii diagram: |Y|
The front rotor would feed one GT35, mounted rather low while the rear rotor would feed the other GT35, mounted higher up and closer to the rear. As for the middle rotor, it would be split between the two.
2. Flow dynamics aren't my area of expertise, but I would assume that depending on pipe routing and turbo placement, the front turbo would have shorter runners than the rear turbo. I believe it would make the most sense to have the quicker-spooling turbo on the shorter runners so it can get up to speed as quickly as possible.
3. As turbo efficiency maps are a bit over my head, both turbos would have to operate at the same boost pressure to not over-run each other without some form of check valves. A/R's and Airflow vs pressure are way out of my knowledge base, but I do know that people running twin fuel pumps encounter a similar issue when compared to a large single pump. Aaron Cake would be better equipped to answer questions such as this than I am.
4. Are you planning on a sequential setup or running them in parallel? How are you planning to merge their outlets together before the intercooler? Downpipe routing? Wastegates? Intakes & air filters?
