On anything 35r sized or larger, you will have issues clearing the a/c with the downpipe.

 

also would like to here more from shearer or other shops on a few missed questions on this thread.

 

i run a 5 bolt t3 60-1 on my integra and its works fine for me. but i do hear a lot pf people say that the 4 bolt flows better and will make more top end power

 

Well is there different hotside sizes that are 4 and 5 bolt?? If so then what one we talking about? What ssize hotside is best for the garette bb 50trim for the evo?? And in what bolt 4 or 5. ?????????

 

Anyone know???

 

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.

 

Well I guess I will find out my self too. Just order'd a kit. See what happens

 

I agree with your observations. I tuned my customers car with your 35R kit, and I was amazed at how well it spooled.

 

I take it the 5-bolt was a .82 A/R housing as well?

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.

 

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

 

No, He switched from PTE's 5 bolt .63a/r housing to a Garrett .82a/r.

 

How do u know that 4 bolt to get what's the garrett bb 50t comes with??? Or are they al the same

 

I don't suppose it's worth pointing out to you that there was a change in A/R.

 

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.

 

hmmmmmm!!

has anybody else done back to back test with same hotside?

you have a valid point frenchy4g63