What size headers
New to the group & first post. I’m running a DCI 5 combo, the guy that build my Taj Mahal intake also spec’d my headers. The trq numbers were a good bit lower than my previous build & thinking it’s a combination of huge plenum & too big of header tubes 2 1/4 to 2 3/8 5” collector. Anyone else running tubes this big on 1050-1100 hp range. My dad’s combo has 2 1/8 to 2 1/4 w/4” collector, smaller intake plenum as well & made roughly 80 ft lbs more trq.
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You say your Fathers combination has less plenum volume than yours, what about total intake track length for each combination? Stan |
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What size carb do you run?
Have you ran the dual 4bbl top? :confused: |
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That is definitely a large header. Not sure if you're trying to get the 80tq that your dad is up or what you're looking to gain. But my honest opinion is it'll take a combination of intake and header work. If the plenum is so large you're having issues on the leave that's definitely not right and you will see gains once that is fixed (I'd bet your shift recovery is bad also due to it).
One thing you could do with the headers is move to a 4 or 4.5 inch collect and lengthen it. See how that works. I'm guessing yours are removable so that would be a very easy thing to test. Fwiw, I ran 2 1/8 to 2 1/4 4" collector on my 1050hp 511ci. |
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Launch RPM?
:confused: |
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Mine 284/306 .954 .936 121 lobe sep |
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I would try another cam. |
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A overly large primary tube on a given race motor can sometimes be partially compensated for by a longer then needed collector extension.
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around 7800 & I pulled it to 8400. Only 7 passes on this setup & no clean runs yet but I was only crossing @ 7550-7600 @ Gainesville for the gator nationals this year. |
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What does each engine have for stall speed? Stan |
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