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Old 08-23-2010, 11:50 AM   #11
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So I'm wondering on a turbo application is the 2.3 would be better than the 2.0 on the 2.0L engine?
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Old 08-23-2010, 02:09 PM   #12
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So I'm wondering on a turbo application is the 2.3 would be better than the 2.0 on the 2.0L engine?
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Would the 2.0 ECU be able to control the 2.3s runner controls, though?
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Old 08-23-2010, 05:15 PM   #13
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Would the 2.0 ECU be able to control the 2.3s runner controls, though?
I'm trying to work that out. I'm trying to use the functions to switch my tumble flaps to control the runner lengths. Since I have the SCT pro Racer package I can set the RPM/Throttle I want the change over to occur, and there are several tables/functions to modify fuel/spark etc when flaps are open/closed.

So since I really do not need to modify A/F ratios or spark for the runner length changes, I'll neutralize all the modifiers for "tumble flaps" open/closed, and set the Throttle/RPM where I want it.

My only concern is that there might be a few things in the cal that I cannot align to the new manifold, so I'll have to see how it behaves. Worse case scenario is I leave it on the short runners and give up some low end torque, or get an ECU from a D23.
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Old 08-24-2010, 12:37 AM   #14
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If we need Cossie Manifold measurements I'm sure I could come up with some. Yes the runners are very short and have trumpet style velocity stacks on the ends. There is also a large rounded triangular (point down) plenum as the main chamber. We'll work some science and come up with some numbers..
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Old 08-24-2010, 07:57 AM   #15
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For what he is doing I wouldnt think he would want the runner controle and would remove them

The 2.3 out flows the 2.0 by a good bit when I had the 2.3 head on the flow bench. I never tested this with a 2.0 head because I would never use one

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Old 08-24-2010, 01:20 PM   #16
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I just unplug the selenoid for the runner control to leave it on short runners full time

Isn't the 2.0 and 2.3 head and cams the same, the only difference is the block on a 2.3l is taller by 1/2 inch.
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Old 08-24-2010, 01:42 PM   #17
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There is hugh Diff between the 2.0 and 2.3 head and the cams are slightly diff as well

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Old 08-24-2010, 04:06 PM   #18
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I have some pictures of the flaps



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Old 08-25-2010, 05:18 PM   #19
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Quote:
Originally Posted by 1turbofocus View Post
For what he is doing I wouldnt think he would want the runner controle and would remove them

The 2.3 out flows the 2.0 by a good bit when I had the 2.3 head on the flow bench. I never tested this with a 2.0 head because I would never use one

Tom
I just want the best of both worlds, with the standard gear ratios in the MTX75, I need as much low end torque as possible, so flipping from long to short runners @ about 5500 RPM works for me. If I run on the short runners only, I will probably loose about 15ftlbs TQ in near 3500-4000 RPM range, and about 7HP.

I think that's certainly worth keeping the runner control operational, the "tumble flaps" pictured above have been removed.....
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Old 11-22-2010, 07:23 PM   #20
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Awesome write-up. I was always curious about those those intake runners. The tumble flaps that you talk about for better combustion, for emmissions, Would that be for a little more torque on a street car? I see you can do that to a mustang motor, but I know thats a V/8 car. thanks again.
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