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I had similar issues when i ran the Pfab replacement manifold. My tuner just couldnt gain more horsepower with the pfab manifold. We slapped on the greddy manifold and made power again. Even though the pfab manifold may be more reliable in terms of cracking, the greddy manifold is a better design. Complete a compression and leak down test, check around the most you can for anything that may be causing this. If all checks out fine, the manifold is most likely your cause.
I had similar issues when i ran the Pfab replacement manifold. My tuner just couldnt gain more horsepower with the pfab manifold. We slapped on the greddy manifold and made power again. Even though the pfab manifold may be more reliable in terms of cracking, the greddy manifold is a better design. Complete a compression and leak down test, check around the most you can for anything that may be causing this. If all checks out fine, the manifold is most likely your cause.
I'm stuck on this manifold because I already welded the flapper on the t518z, there's no going back for me haha. I don't think I have another option but to continue using it.
I actually read that somewhere on the forums too, someone lost power on the pfab replacement, there wasn't much more info so I thought it was maybe just that individual. Pfab even mentions his ports are larger, I thought maybe that would help the manifold flow better than the greddy. Interesting..
doesn't beat my awful 230whp dyno when i switched to a pfab log manifold. i was previously at 280whp then my greddy manifold cracked. AEM V1, dual 70mm exhaust, and everything else was stock greddy parts. I think i was at 8psi for both the 280whp/230whp.
Last edited by guamie; Mar 6, 2018 at 04:57 PM.
Reason: wrong picture
log manifold generally hold you bank on a lot of power on this car. On my first turbo setup I ran a cheep $200 rev hard log manifold with a garrett t3 50rim turbo and made 330whp. I switched to a tubular mase manifold and gain 65whp to almost 400whp.
doesn't beat my awful 230whp dyno when i switched to a pfab log manifold. i was previously at 280whp then my greddy manifold cracked. AEM V1, dual 70mm exhaust, and everything else was stock greddy parts. I think i was at 8psi for both the 280whp/230whp.
Holy crap! Is this not something we can complain to pfab about? If this is a design flaw it's absolutely ridiculous, we are almost competing with stock s2000's while running 8psi! LOL
Originally Posted by AP1Chief
gawddd what awful manifolds lol
I know right!
Originally Posted by s2000Junky
I especially like how when vtec kicks in you lose 30-50trq/whp. Going for a unique set up
Originally Posted by guamie
[left]Reverse vtec!
LMAO!
Originally Posted by riceball777
log manifold generally hold you bank on a lot of power on this car. On my first turbo setup I ran a cheep $200 rev hard log manifold with a garrett t3 50rim turbo and made 330whp. I switched to a tubular mase manifold and gain 65whp to almost 400whp.
If there was any way to make literally any other style manifold that flanges t25 I would opt for it.
Despite the lack of top end, i honestly liked the kit at 280whp. It made driving around town much more enjoyable with the little torque provided. In the parking lot people call the Bay Area, there isn't that much use for top end anyways.
Despite the lack of top end, i honestly liked the kit at 280whp. It made driving around town much more enjoyable with the little torque provided. In the parking lot people call the Bay Area, there isn't that much use for top end anyways.
You never had that issue resolved? Did you scrap the entire kit? I'm going to do a boost leak test, and pull the turbo to rule out a few things. If that clears i'll do a compression/leak down test and if that clears then I can be certain it's the manifold.
