And I thought the ILP log was among the most inefficient manifolds out there together with other logs.

Refering to what Evans said about the manifold:
I would like to call the builder of this manifold clueless. There is no reason to build a restrictive high backpressure manifold to achieve "reliability and simplicity". Thats just plain stupid.

 

I would of kept the stock head gasket. I dont think its the mani's fault. Tech with the yellow ap1 made 460whp with a bigger turbo on his set up on the same mani So im sure theres a 50whp loss from another issue.

 

he is running 18psi of boost. i think the mani is a major problem.

 

wrong. not the same manifold at all or even close.

tech had the p-fab log.

 

Still same huh. That's suck dude. I'm also interesting to look at photo of manifold.

I know OP posted someone's s2k that has same setup on his FS thread, I wonder how much that person made on dyno.

 

manifold is made by a guy who works at LHT performance here in tampa. they dont even offer that manifold as a purchasable item because it was simply the workers own fab.

looks similar to a pfab log, but without close up pictures, its really hard to tell what is up.

id like to hear Evans's take on this manifold in comparison to other logs available.

Tech did make 46Xwhp with the pfab log and a .70A/R turbine housing, sooooooo im leaking towards the turbo having an issue. like an off-balance wheel or out-of-round bearings. something like that.

or that manifold is just extremely constricting, but like i said, more pics would help A TON.

 

I'm on vacation but when I get home ill post pics, evans did say during the tune session the turbo was screaming, like working harder then it should, atleast that's what it sounded like.

 

^i bet it was the turbo. trying to work double time since something was "wrong" with it. i say it was taken apart and put back together w/o being balanced or it had the comp wheel replaced or something of the like.

 

I do know after recently looking, the angle and way the turbo flange sits on the runners, when you look inside the. Manifold you see honestly on runner blowing directly into the turbine, and the other 3 look like they would stuggling to get in there.

 

At what RPM you have the VTEC switchover? If you have a AEM maybe try upping the switchover to about 6.5krpms or higher, I have seen cars with restrictive turbo/manifolds that the HI cam lobes made less power at lower changeover settings back pressure too high for high duration cams at a given rpm. With High duration cams and too high of back pressure exhaust gasses actually may go back to the cylinder and contaminate the mixture. If you move up the changeover the engine can get enough momentum or flow though the head in order to engage the high cams and not loose exhaust velocity and finally run higher duration on top. I think that at least you can get 25whp or more than you have now by doing this.