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#1
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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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#2
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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
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#3
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We’ve had both intakes scanned I’ll have to find that information. Wilson intake built my dads & made two hats for it, a single & a dual. Self Racing built mine. I’ve had a local guy take some plenum area out of my intake last year & it helped some but still not right. Yet to make a clean pass with it, it coughs, spits , sputters & tries to die on the launch. The general consensus is the intake is so big it’s losing carb signal on the launch.
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#4
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What size carb do you run?
Have you ran the dual 4bbl top?
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#5
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#6
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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. |
#7
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#8
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#9
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Launch RPM?
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#10
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Mine 284/306 .954 .936 121 lobe sep |
#11
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Sorry it didn’t post the 1st time for some reason but 5800.
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#12
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My heads were also hogged out. Once dad’s new set of 5s & his new intake are ready I’ll decide whether I take his old heads or back up & punt. These 5s made good #s on the dyno but we haven’t seen the gains on the track to match the #s. I gained 100hp & lost 60ft lbs of trq compared to my 535 with 11 degree eldebrocks. Dad gained 140hp & about 80 fr lbs trq over his 535 11degree combo. We throttle stop race & the cars are running the same mph with this combo than the old. Both 535s had cams in .763 .780 range & both cars went 5.20s on a single carb i@ Huntsville Dragway.
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#13
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I would try another cam. |
#14
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#15
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There is going to be a huge difference between those two cams. That second one is going to move the power band much higher in the RPM range.
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#16
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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.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#17
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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. |
#18
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#19
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What does each engine have for stall speed? Stan
__________________
Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#20
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Both have 6400.
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