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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 01-14-2010
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Icon7 headers and torque!

I have an 03 ranger sohc 4.0 does running headers on these motors cause you to loose torque? Due to too much flow. My exhaust is 2 quarter from the cats back. And I'm running a 40 serious flow master. THANKS!
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Old 01-14-2010
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I'm no expert on headers on a 4.0, but the stockers actually look pretty decent.
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Old 01-14-2010
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ive never heard of it loosing tourqe... but it doesnt increase that much either...
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Old 01-14-2010
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Thanks for the input guys!
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Old 01-14-2010
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Quote:
Originally Posted by 4.04x4 View Post
I have an 03 ranger sohc 4.0 does running headers on these motors cause you to loose torque? Due to too much flow. My exhaust is 2 quarter from the cats back. And I'm running a 40 serious flow master. THANKS!
SOHC stock headers flow well compared to the OHV that do not. You won't get much improvement to the SOHC. The last cat has a 2 1/2" diam tube that reduces down to 2 1/4". You should see better inprovement if you get rid of the reducing flange and run full 2 1/2" from cat to and from muffler.
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Old 01-17-2010
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So the combo of larger Cat Back exhaust and Headers gives a decent return?
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Old 01-17-2010
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Well, my '07 has a cat on each side after the manifold then a 3rd larger cat @ the Y-pipe union. I went with the Dynomax 2-1/2" cat-back kit to get a better sound and flow. I noticed a little top end improvement and better sound but no other real changes. On mine, the Y-pipe has some significant factory kinks in it for clearance that appears to be more of a potential flow problem than the factory manifolds on the 4.0 SOHC.

For less than $200 delivered, the cat-back system acheived what I was looking for. I have doubts regarding the cost of headers-vs-effectiveness without addressing the Y-pipe & the factory cats. When you add those to the equation that is a lot of $$$ for what the potential gain would be on a stock engine. That's my opinion.
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Old 01-30-2010
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I port and polished my 97 b4000 header than removed a cat and ran the exhaust out the side to keep the 3 inch pipe from the flow master increased power by like 20 hp maybe helps it get to 107mph a little faster still sucks off the line
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Old 01-30-2010
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Read and understand.
CobbTuning.com - Exhaust Design
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Old 01-30-2010
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Quote:
Originally Posted by brizzle99 View Post
I port and polished my 97 b4000 header than removed a cat and ran the exhaust out the side to keep the 3 inch pipe from the flow master increased power by like 20 hp maybe helps it get to 107mph a little faster still sucks off the line
20 hp?

Says who? Your butt dyno?
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Old 01-30-2010
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20 hp?

Says who? Your butt dyno?
Interesting. I can barely tell the difference on 50-60whp after actually measuring it myself. Sounds like a bunch of tom-foolery to me.
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