Mid -Lengths out do Longtubes!!!
11-07-2003, 09:15 PM
#1
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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 
11-07-2003, 09:57 PM
#4
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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
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
11-07-2003, 10:48 PM
#5
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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.
11-07-2003, 11:21 PM
#6
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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.
11-08-2003, 12:51 PM
#9
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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
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
Good LT's (hooker, jethot) will outperform mids any day of they week.
11-08-2003, 01:33 PM
#12
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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.
11-08-2003, 01:40 PM
#13
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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.
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.
I would think it would be the opposite. LT's would give it more room to breath up top, better flow.
11-08-2003, 02:02 PM
#14
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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
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