Diference in hp between a .90 exhaust housing and a 1.12
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Diference in hp between a .90 exhaust housing and a 1.12
We have a gt42-94 with the .90 with a ramhorn manifold and
are changing to a topmount twinscroll manifold with the 1.12
and whold like to know if someone have done it before and can
tell me the diference .thanks alot for the help
are changing to a topmount twinscroll manifold with the 1.12
and whold like to know if someone have done it before and can
tell me the diference .thanks alot for the help
Honda-Tech Member
Joined: Jul 2006
Posts: 5,433
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From: CRESWELL, Oregon, 97426
Re: Diference in hp between a .90 exhaust housing and a 1.12
I went from a .90 to a 1.10 on a S372r. Spool took 2-300 rpm longer, but at the same boost it made 40+ peak power, and averaged 25hp after full boost was reached. This was at 24psi in my case. Went from 599whp to 64x. It also smoothed the graph out as if it was no longer fighting a restriction. IMO
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