a1320honda

Ill try and keep this brief, i havent been able to find out much info on this actual subject, nor have i had the ability to test this.

Ive got a Garrett GT4294R turbo with the 1.01 divided exhaust housing on it. Im running an open manifold. I knife edged the entry to the turbo but its still pretty laggy. Would i see better spool time going to the actual open housing? The smallest one they make is a 1.15A/R. Its not getting to full boost till almost 7000. Id like it to be closer to 6000. I used to have the same turbo on a divided manifold but right now thats not an option. SO basic question, will it actually spool faster with the open 1.15 housing?

SPOOLINmatt

define "full boost"

I don't think its the turbo.

a1320honda

Right now for the street its set to 20lbs in 4th gear. It doesnt reach a full 20lbs until 6800-7000. Ive had the same turbo on a divided manifold setup a few years ago and it was actually pretty quick spooling. Like 20lbs at 6000.

Flexer

on a 1.8L or 2.0L that turbo should be "all in" by 6000 rpm.

a1320honda

I understand...my question is, will going to the open housing help with the spool overy the divided housing?

Flexer

While I have no experience.....if you knife edged it than it shouldn't. The divided housing A/R is in fact slightly smaller than the equivalent open. Have you done a boost leak test yet

a1320honda

I did some tuning, its actually spooling a bit qucker. I think it right were it should be for being what it is. I think my only real option is to get a divided manifold lol. Thanks for the replies.