Mid -Lengths out do Longtubes!!!
I was flipping through car craft and came across a header comparison. 1 5/8 longtubes made 327 Hp @ 4,600 and 439 Tq @ 3,000 And 1-5/8 midlenghts made 338 Hp @ 4,600 and 433 Tq @ 3,400 And after 3,400 the midlenghts OUTPROFORMED the longtubes to redline :eek:
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Well its good thing i have 1 3/4 long tubes
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what brand were they? Maybe it was a good mid and a crappy longtube? But in most cases i think the LT will always out perform the mid.
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The thought that longtubes always outperform mid lengths is another one of those, "my buddy did it" things I run across on here quite a bit. Too many people get tied up in the "buzz word" thing. Many people think you've got to have LT's to run fast.
These aren't new tests. It's a proven fact that mid length headers (of the same tube diameter) will usually make more top end HP than longtubes. Longtubes will, however, usually make more low end torque. Frank |
One would only loose hp and tq if you put 1 3/4 long tubes on a bone stock motor. I mean loose power compared to mid tubes. One would see better hp and tq specialy tq with a 1 3/4 mid tubes on a stock motor. Plus who makes the headers and how good they were made all makes a differnce as well.
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Injuneer tested a set of AS&M mid lengths that had been modified to have 3" collectors (I think that was all) against a set of Hooker (?) long tubes on a race only motor. I don't think they even started recording on the dyno until over 5000 rpm, but the mid lengths outperformed the long tubes. Not exactly a great test for what to put on you street car but this is the most reliable comparison i've seen.
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They were Hedman headers. From what I read unless your car is producing 420 hp or more 1-3/4 size headers hurt you more than 1-5/8.
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well i dont make near 400hp and my lt's helped out a lot my car is a lot faster
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Originally posted by 12SCNDZ The thought that longtubes always outperform mid lengths is another one of those, "my buddy did it" things I run across on here quite a bit. Too many people get tied up in the "buzz word" thing. Many people think you've got to have LT's to run fast. These aren't new tests. It's a proven fact that mid length headers (of the same tube diameter) will usually make more top end HP than longtubes. Longtubes will, however, usually make more low end torque. Frank :p |
Your on crack buddy :rolleyes: Good LT's (hooker, jethot) will outperform mids any day of they week.
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My buddies SS with Mid-lengths and Borla is a slug compared to my LT's and Loudmouth.
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In his building horsepower book Vizard says the longtubes usually make more low end torque but the mid lengths give more top end HP. He tested a couple systems side by side and on similar motors the mid lengths gained about 10 hp over the lt's, at the expense of a lot of bottom end torque.
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Originally posted by Kuma In his building horsepower book Vizard says the longtubes usually make more low end torque but the mid lengths give more top end HP. He tested a couple systems side by side and on similar motors the mid lengths gained about 10 hp over the lt's, at the expense of a lot of bottom end torque. |
Again...Are we basing this on FACT or OPINION? I've seen many dyno test that show mid lengths making more top end HP. I think this...This should be...Or "You would think" doesn't show on the dyno.
Anyone got any back to back dyno pulls, or quarter mile times between mid lengths and LT's? I don't think my mid lengths are holding my car back too much. My full weight, stock 95,000 mile bottom end, 93 Z went 12.0 last Saturday...In 80 % humidity. Frank |
Pick up the latest Car Craft its a fact.
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