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Engine - General, Exhaust & Induction Topics about the general engine items, exhaust system discussed here & Improving the intake tract - air filter to intake valve.

 
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post #1 of 11 Old 02-26-2013, 02:22 PM Thread Starter
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exhaust manifolds: Log vs tubular

Anyone have real world numbers on these such as a before and after or a direct comparison as far as power? Brands VS Brands or type VS type?
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post #2 of 11 Old 02-26-2013, 11:35 PM
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Re: exhaust manifolds: Log vs tubular

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Originally Posted by 85glhomni View Post
Anyone have real world numbers on these such as a before and after or a direct comparison as far as power? Brands VS Brands or type VS type?
the fastest 8v turbo Dodge runs a ported stock manifold.

As far as flow goes I've tested a tube header with a 1.5" primary tube and it flows worse than a ported stocker. Also tested a cast log TU custom header and it really flows well, 35 CFM per exhaust port more than the other 2.
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post #3 of 11 Old 02-27-2013, 05:37 AM
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Re: exhaust manifolds: Log vs tubular

It's not tublar but I am running a TBI header on my Omni:





It sucks. Was a neat idea, and fun to build, but spool up takes FOREVER. It would be good if the motor was spinning at 9000 RPM all the time, but for street use it is FAR less than ideal, I will be going back to a ported log this spring.
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post #4 of 11 Old 02-27-2013, 05:55 AM
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Re: exhaust manifolds: Log vs tubular

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Originally Posted by turbot11 View Post
It sucks. Was a neat idea, and fun to build, but spool up takes FOREVER. It would be good if the motor was spinning at 9000 RPM all the time, but for street use it is FAR less than ideal, I will be going back to a ported log this spring.
Are you running a 2.2 or 2.5? Did you notice any top end gain?
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post #5 of 11 Old 02-27-2013, 06:15 AM
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Re: exhaust manifolds: Log vs tubular

It's a common block 2.2, my goal has been to sort of duplicate a super 60 setup. The turbo is slightly bigger than a super 60 and would a little better suited to take advantage of a 2.5. However it should spin up MUCH better than it does on the 2.2. Top end is the only place that it begins to do anything. Granted I had some swingvalve issues to work out but even after they were corrected it was a dog until 4000+ RPM
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post #6 of 11 Old 02-27-2013, 06:20 AM
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Re: exhaust manifolds: Log vs tubular

My 2.2L with TBI header + TII turbo machined for T04E 50 trim and stage III turbine wheel have full boost (12psi) by 3500rpm. It does have a ported head though.
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post #7 of 11 Old 02-27-2013, 06:37 AM
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Re: exhaust manifolds: Log vs tubular

I have a ported head and matching manifolds too. Wish mine spun up that fast it just doesnt seem to have enough gas flow till after 4000. I'm going to go to ported log and a better SV this spring and see how that works
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post #8 of 11 Old 02-27-2013, 12:05 PM Thread Starter
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Re: exhaust manifolds: Log vs tubular

Any clearance issues on the omni with that TBI header. It looks like the turbo and wastegate actuator are sitting out a bit.(just curious). I
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post #9 of 11 Old 02-27-2013, 03:32 PM
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Re: exhaust manifolds: Log vs tubular

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Originally Posted by turbot11 View Post
It sucks. Was a neat idea, and fun to build, but spool up takes FOREVER.
Is that a .63 A/R turbine housing?
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post #10 of 11 Old 02-27-2013, 07:08 PM
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Re: exhaust manifolds: Log vs tubular

Quote:
Is that a .63 A/R turbine housing?
Almost! .64 A/R on the hot side
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post #11 of 11 Old 02-27-2013, 07:18 PM
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Re: exhaust manifolds: Log vs tubular

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Originally Posted by 85glhomni View Post
Any clearance issues on the omni with that TBI header. It looks like the turbo and wastegate actuator are sitting out a bit.(just curious). I
Acutally it fits!










The pic in the above post, the wastegate is only loosely bolted onto the compressor housing with one bolt. The motor was just being test fitted into the bay when that pic was taken, lol
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