Any extra hardware needed for speed engineering LT'S
Oct 20, 2015 | 02:29 PM
#41
Thread Starter
On The Tree
Joined: Jun 2013
Posts: 123
Likes: 3
Max potential horsepower is volumetric effiencincyXrpmXcubic inches
Engines are just a bunch of equations from intake to the exhaust
Oct 20, 2015 | 03:01 PM
#42
Theoretically 1 7/8 are better at higher rpm, but again leads to what we both said more you pull in, more that has to leave... Most nbs trucks came with 75 or 80mm throttle bodies, in my case im running an intake that can pull much more air as well as a 92mm throttle body, not getting into exact math but it is a 
load more air that has to go somehwere... In a hurry!!! Hell 1 5/8 primary long tubes will flow better than a stock manifold, im goin to run 1 7/8 but then again my air intake sounds like a vacuum at this point too.... From what ive read, seen, etc the bigger the primaries the higher in the curve you peak..... Oe manifolds are adequate for smaller cams and bolts ons, but theyre basically designed to provide peak numbers at lower rpms where average person who owns the vehicle is goin to drive it....
load more air that has to go somehwere... In a hurry!!! Hell 1 5/8 primary long tubes will flow better than a stock manifold, im goin to run 1 7/8 but then again my air intake sounds like a vacuum at this point too.... From what ive read, seen, etc the bigger the primaries the higher in the curve you peak..... Oe manifolds are adequate for smaller cams and bolts ons, but theyre basically designed to provide peak numbers at lower rpms where average person who owns the vehicle is goin to drive it....
Last edited by Wolftrk99; Oct 20, 2015 at 03:09 PM.
Oct 20, 2015 | 03:49 PM
#43
Staging Lane
Joined: Oct 2015
Posts: 60
Likes: 0
From: Just south of Kansas City, Missouri
Its not a huge gain but basically they do flow better, put it this way factory manifolds are designed to work with the amount of air etc the engine pulls in, you start pulling more air in keeping valves open longer and valves opening further, now you have twice as much coming in trying to escape through the same route, headers open the exhust to flow better.... Not that oe mnifilds dont do their job, even with the excess, just leave some on the table with them!!!
Oct 20, 2015 | 03:55 PM
#44
Tune alone will wake things up quite a bit.... The speed engineering headers are less than 300 unkess you get y pipe, then theyre $349(iirc), if youre planning on a cam why not get the headers out of the way, if youre going witb headers, the you dont have to worry about it and exahust will be done...just food for thought!!!
Oct 20, 2015 | 03:57 PM
#45
If youre donna do a cam swap in the spring why not wait on the tune, that way you only have to get tuned once?? Spend money youd spend on the tune on headers and roll with it til spring.... Unless youre gonna go catless then that changes everything
Oct 20, 2015 | 06:46 PM
#46
Staging Lane
Joined: Oct 2015
Posts: 60
Likes: 0
From: Just south of Kansas City, Missouri
I want to see what kind of a difference it makes after just a tune. I've looked at the Speed Engineering headers but don't want to buy something made in China and they've never answered my question about where they are made. I've seen some comments in the header threads about problems with Chinese made exhaust parts. I've never bought anything that was Chinese made for my trucks but have had enough bad experience with other items that I don't care to mess with them.
