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Well, I have had my PFAB divided ELT Manifold and divided GT35R exhaust housing for several months now. I have the same setup as JoeyBalls, except that I have a built 9:1 compression motor and AP1 cams and head. I had difficulty making anywhere near the numbers that Joe made. I could only make 390 at 25 psi. I bought an Alaniz head and swapped that in. Numbers actually got worse. I took it to a different tuner (Tony at T1 in Dallas) and he told me that my issue was the 1.06 divided exhaust housing. It spooled very quickly (made 20 psi at 4000 rpm) but maxed out very quickly. I spent hours researching this kit, and talked with Pang and watched Joe's build, and just could not imagine that the housing was the issue. Well, he was right. He swapped in a non-divided 1.06 T4 housing on my divided manifold and instantly picked up 100 hp. Final tune on pump gas is now where it should be on a low compression motor. I made 491 hp and 340 torque at 19 psi (93 octane pump gas). I am finally happy with this purchase. Believe it or not, it actually still spooled very quickly with the divided manifold.
So, long story short, for whatever reason, my AP1 low compression motor needed more exhaust flow than the divided 1.06 housing would offer. I know that there are several AFI kits and CFT kits that are using divided mani's, and if you don't make the numbers you want, check out a bigger exhaust housing.
Here are the dyno graphs for comparison. The lower numbers are the divided housing and the bigger, better numbers are the non-divided housing (both are 1.06)
First dyno is WG only and second dyno is 60% duty cycle, which is 19 psi.
09-01-2010, 08:20 PM
My Divided Manifold and Turbo Failure
glad u got it figured out
