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Review JHRacing T4 Divided Manifold - AWESOME SPOOL IMPROVMENT!

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Discussion starter · #1 · (Edited)
I had a Divided Cast HKS T4 manifold last year and this year I upgraded to a JHRacing Divided T4 manifold.
I have been impressed from the second I got it. Looks, fitment, everything is great. This thing is STOUT!
I bouhgt it for better fuction, and that is what this review is about.
Spool is greatly improved!
I am running a Full T4 6776 Journal Bearing Turbo with a .85 divided hotside.
I do not have logs of my old HKS peice but I can tell you I was hitting 20 psi about 5800 rpm.
I am still breaking this motor in, and having some turbo issues. I cant tell you when 35+ psi comes becaue I am waiting on new wastegate springs. I am maxing out around 24 psi on the current springs.

RESULTS! 20PSI AT 4808 RPM in 3rd! OMG THAT IS A HUGE IMPROVMENT!
I am expecting 35-40 psi BEFORE 6K.
35psi on my old manifold came around 7Krpms.
This manifold is awesome and helped spool greatly! It seems about a real 1000 rpm faster spool, that is huge!
Thanks Jake!
 
Discussion starter · #3 ·
Some questions from the dsmlink board answered here:
I have two crappy ebay 38mm wastegates on the car. It was the only thing I went cheap on. Spare me any bs anyone has to say about cheap parts, you ca go f y s with all that. I had to cut one cost corner and this was it.
The weak china springs are little guys in there. I have them shimmed with washers and my MBC maxed out and I can get about 24psi. I have new stronger springs coming. The only thing I do not like is two wastegates, one 38mm worked fine for me but 2 is the only way to be truly divided.

3rd gear, I will do the speed on one but I am two lazy to do both. They are both the same log. It is just a random 3rd gear pull.

4808 rpm - 64.6mph

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It is a 2G car. 2.0 6 bolt, Low Compression JE/Eagle motor w/ JMF Race manifold, 3" hot and cold IC piping, 24x12x5 FMIC and BC 280 cams. ALL THOSE THINGS SLOW SPOOL GREATLY! It is a bad spool combinations, but it still spools awesome, lol! The cams are also dropped in straight up on stock gears. Stock cleaned up head.
I hope that answered everyones questions.
 
#4 ·
Were you using the same divided housing with the HKS manifold? That would be a big reason for the difference in spool, as the HKS manifold is technically not a twin scroll mani, the divider in it doesn't quite extend far enough. But glad to see that JHR manifold is working well for you, it is a beautiful piece.
 
Discussion starter · #7 ·
I have a pretty good size boost leak at the compressor cover. I have not took the manifold and turbo off yet to fix it ( so this is with a large boost leak.

28psi at 5350rpm :) Still lots of room for improvement also! remember this is a journal bearing 6776, full T4

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