4 bolt to 5 bolt turbo hotside difference's?
May 17, 2007, 06:54 PM
#16
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May 18, 2007, 07:20 AM
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The only comparable results that I have is from a customer with our DSM T3 manifold with a 35r. The car had made 640hp/535tq with PTE's 5 bolt housing. He later switched to a Garrett .82a/r 4 bolt housing and made 667hp/545tq and reached the 500hp mark 400-500rpm later in the powerband. Off the top of my head that is roughly a 4% gain in peak power for a power band you have to wait another 400rpm to get. For your average street car, I'll take the 5 bolt housing.
May 18, 2007, 07:12 PM
#23
The only comparable results that I have is from a customer with our DSM T3 manifold with a 35r. The car had made 640hp/535tq with PTE's 5 bolt housing. He later switched to a Garrett .82a/r 4 bolt housing and made 667hp/545tq and reached the 500hp mark 400-500rpm later in the powerband. Off the top of my head that is roughly a 4% gain in peak power for a power band you have to wait another 400rpm to get. For your average street car, I'll take the 5 bolt housing.
May 18, 2007, 09:18 PM
#24
The only comparable results that I have is from a customer with our DSM T3 manifold with a 35r. The car had made 640hp/535tq with PTE's 5 bolt housing. He later switched to a Garrett .82a/r 4 bolt housing and made 667hp/545tq and reached the 500hp mark 400-500rpm later in the powerband. Off the top of my head that is roughly a 4% gain in peak power for a power band you have to wait another 400rpm to get. For your average street car, I'll take the 5 bolt housing.
I'm wondering if the 4-bolt housing actually has a larger throat radius. If this is the case, the .82 A/R 4-bolt would actually have a larger area then the .82 5-bolt. Makes me wonder if the .63 A/R 4-bolt could make the same power as the .82 A/R 5-bolt housing while offering better spool?
I remember seeing a comparison of the .63 A/R housings on a ~400 HP turbo honda and the 4-bolt came out on top on spool and power.
May 19, 2007, 08:07 AM
#25
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one of our sponsored drift teams, Enjuku Racing out of Florida actually tested the .63 a/r 5bolt "ford style" housing against the 4bolt T31 .63 a/r. same day, same turbocharger, same spool and the 4bolt gained 20whp over the 5bolt. they then tested the GT 4bolt housing, with the 3" diverging cone discharge and noticed a gain of 40whp over the 5bolt.
the GT 4bolt is the housing that is near impossible to use in an evo app. while maintaining a/c.
from what we've seen, the oncenter entry of the 5bolt housing causes a lot of energy loss...
hope this helps guys
Ken Peak
May 20, 2007, 08:34 PM
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Ok...
So, the difference in spool was due to the smaller housing, not the 4-bolt vs. 5-bolt.
The difference in peak power was due to the larger housing, not the 4-bolt vs. 5-bolt.
This test doesn't really help to prove anything either way.
So, the difference in spool was due to the smaller housing, not the 4-bolt vs. 5-bolt.
The difference in peak power was due to the larger housing, not the 4-bolt vs. 5-bolt.
This test doesn't really help to prove anything either way.
Last edited by Frenchy4g63; May 20, 2007 at 08:45 PM.
