why a single instead of twins?
Thread Starter
3rd gen rx-7
Joined: Jul 2004
Posts: 14
Likes: 0
From: granada hills, ca
why a single instead of twins?
sorry everybody cause i might sound ignorant...
i see everyone talking about how they want to switch from a twin turbo setup to a single turbo...i thought twin turbochargers evened out the power, the smaller turbo spins quickly to boost up the torque to help the turbo lag, while the larger turbo takes care of boost at high speeds... if you had a single setup, you would have to sacrifice one for the other...wouldnt you?
please i just need a simple explanation..iremember reading a reason for this conversion in another board...but i semm to have forgotten. is it because the intake air goes to both turbos, causing less air to go to the turbo you need?
thanks
future rx-7 owner...[ i turn 16 in 3 months ]
i see everyone talking about how they want to switch from a twin turbo setup to a single turbo...i thought twin turbochargers evened out the power, the smaller turbo spins quickly to boost up the torque to help the turbo lag, while the larger turbo takes care of boost at high speeds... if you had a single setup, you would have to sacrifice one for the other...wouldnt you?
please i just need a simple explanation..iremember reading a reason for this conversion in another board...but i semm to have forgotten. is it because the intake air goes to both turbos, causing less air to go to the turbo you need?
thanks
future rx-7 owner...[ i turn 16 in 3 months ]
WWFSMD
Joined: Jun 2001
Posts: 5,035
Likes: 4
From: SoCal
The sequential turbos on the FD are the same size. At low RPMs, only one is active, and then both are active at high RPMs. It isn't a switch from one small turbo to one large turbo. Other cars with sequential turbos do the same 1 to 1+2 transition, though some (like Madza's 20B Cosmo) use primary and secondary turbos that aren't the same size. I don't know of any systems that use one turbo down low and then switch to the secondary turbo running alone at high RPM.
Single turbo is simple and gives a smooth powerband (no turbo transition). It is also easier (and cheaper) to get one big turbo that will achieve your power goals than it is to get two turbos for the same job in most cases. Also, some small and moderately sized singles spool almost as fast as the stock sequential system. And more people that go single want a larger single than want a smaller one, so low RPM spool seems to be less of an issue that it may seem at first.
-Max
Single turbo is simple and gives a smooth powerband (no turbo transition). It is also easier (and cheaper) to get one big turbo that will achieve your power goals than it is to get two turbos for the same job in most cases. Also, some small and moderately sized singles spool almost as fast as the stock sequential system. And more people that go single want a larger single than want a smaller one, so low RPM spool seems to be less of an issue that it may seem at first.
-Max
Thread Starter
3rd gen rx-7
Joined: Jul 2004
Posts: 14
Likes: 0
From: granada hills, ca
Originally Posted by maxcooper
The sequential turbos on the FD are the same size. At low RPMs, only one is active, and then both are active at high RPMs. It isn't a switch from one small turbo to one large turbo. Other cars with sequential turbos do the same 1 to 1+2 transition, though some (like Madza's 20B Cosmo) use primary and secondary turbos that aren't the same size. I don't know of any systems that use one turbo down low and then switch to the secondary turbo running alone at high RPM.
Single turbo is simple and gives a smooth powerband (no turbo transition). It is also easier (and cheaper) to get one big turbo that will achieve your power goals than it is to get two turbos for the same job in most cases. Also, some small and moderately sized singles spool almost as fast as the stock sequential system. And more people that go single want a larger single than want a smaller one, so low RPM spool seems to be less of an issue that it may seem at first.
-Max
Single turbo is simple and gives a smooth powerband (no turbo transition). It is also easier (and cheaper) to get one big turbo that will achieve your power goals than it is to get two turbos for the same job in most cases. Also, some small and moderately sized singles spool almost as fast as the stock sequential system. And more people that go single want a larger single than want a smaller one, so low RPM spool seems to be less of an issue that it may seem at first.
-Max
i never knew they were the same size... but most single users have to sacrifice the feeling of torque at low rpms... i think using it as a daily driver like me would better fit twins...
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