Compressor maps of stock 20B twins
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freedomgli (10-19-17)
#2
Hey...Cut it out!
iTrader: (4)
And thy Lord Wankel proclaimed to the admins: Thou shall not fail to Sticky
There should be a 20B-REW FAQ for this specific purpose. Combine this thread with the Torque curves (https://www.rx7club.com/20b-forum-95/20b-torque-curve-stock-twins-vs-naturally-aspirated-933797/), DMRH's dyno run thread (https://www.rx7club.com/20b-forum-95/20b-rew-dyno-550648/) and then link to my "12 Days of Rotormas" build thread (for FC-specific issues and solutions) and that would sew up just about all of the loose ends currently not known to anyone seeking to use the Cosmo twins.
There should be a 20B-REW FAQ for this specific purpose. Combine this thread with the Torque curves (https://www.rx7club.com/20b-forum-95/20b-torque-curve-stock-twins-vs-naturally-aspirated-933797/), DMRH's dyno run thread (https://www.rx7club.com/20b-forum-95/20b-rew-dyno-550648/) and then link to my "12 Days of Rotormas" build thread (for FC-specific issues and solutions) and that would sew up just about all of the loose ends currently not known to anyone seeking to use the Cosmo twins.
#3
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#5
watashi no shichi
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And thy Lord Wankel proclaimed to the admins: Thou shall not fail to Sticky
There should be a 20B-REW FAQ for this specific purpose. Combine this thread with the Torque curves (https://www.rx7club.com/showthread.php?t=933797), DMRH's dyno run thread (https://www.rx7club.com/showthread.php?t=550648) and then link to my "12 Days of Rotormas" build thread (for FC-specific issues and solutions) and that would sew up just about all of the loose ends currently not known to anyone seeking to use the Cosmo twins.
There should be a 20B-REW FAQ for this specific purpose. Combine this thread with the Torque curves (https://www.rx7club.com/showthread.php?t=933797), DMRH's dyno run thread (https://www.rx7club.com/showthread.php?t=550648) and then link to my "12 Days of Rotormas" build thread (for FC-specific issues and solutions) and that would sew up just about all of the loose ends currently not known to anyone seeking to use the Cosmo twins.
#6
DRIVE THE ROTARY SPORTS
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I spoke with Brian at BNR about their 20b upgrade, but we came to the conclusion that max power from a set of re-worked stock turbos would be between 450-475 whp @15psi . Since you can get damn close to that with a 13b, it's not really worth it to stick with the twins. So, how do you swap an ht-12 and ht-18 in? Inquiring minds want to know
#7
My job is to blow **** up
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anybody got pics of the 20b twin turbo package? would they in anyway fit an fd exhaust manifold? whats the turbo side flange look like?
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#8
Hey...Cut it out!
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Not quite sure about using a HT-18 for the front and HT-15 on the rear.
Here's a pic of the mounting flanges, from my build thread "The 12 Days of Rotormas":
Assuming that Hitachi and Mazda did everything numerically, the HT-18 would be 50% larger than the HT-12 and HT-15 being 50% bigger than a HT-10. And by that reasoning, a HT-12 would be approximately halfway between a HT-10 and HT-15. Maybe after my car is done and running nicely, I'll crack open the spare twins here and do some measuring.
Here's a pic of the mounting flanges, from my build thread "The 12 Days of Rotormas":
Assuming that Hitachi and Mazda did everything numerically, the HT-18 would be 50% larger than the HT-12 and HT-15 being 50% bigger than a HT-10. And by that reasoning, a HT-12 would be approximately halfway between a HT-10 and HT-15. Maybe after my car is done and running nicely, I'll crack open the spare twins here and do some measuring.
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Assuming that Hitachi and Mazda did everything numerically, the HT-18 would be 50% larger than the HT-12 and HT-15 being 50% bigger than a HT-10. And by that reasoning, a HT-12 would be approximately halfway between a HT-10 and HT-15. Maybe after my car is done and running nicely, I'll crack open the spare twins here and do some measuring.
the HT-10 and HT-12 also seem to share center sections (i believe its like a garret t2/t25)
and the HT-15 and HT-18 share center sections.
there is an HT-20 also, the RB bonneville car used TWO of them
#11
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it's odd that the primary turbo charger, the front, is the ht 15, and the ht10 is spooled secondly, rather then the ht 10 first.
likely why the FD turbos can see 15psi of boost, yet it's 1800 on the cosmo in this thread.
which makes this a lie: BNR Upgraded 20B turbos.
The primary turbo charger is actually the gt 28, and the secondary turbo is the V trim T04B, a smaller "helper" turbo, rather then the small one being spooled first for the highest possible boost responce.
likely why the FD turbos can see 15psi of boost, yet it's 1800 on the cosmo in this thread.
which makes this a lie: BNR Upgraded 20B turbos.
The primary turbo charger is actually the gt 28, and the secondary turbo is the V trim T04B, a smaller "helper" turbo, rather then the small one being spooled first for the highest possible boost responce.
Might as well revive this, there is still more to learn. And i have a twin turbo Fc setup to be completed soon.(turbo is mounted, just running lines and small fabrication)
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