Crazy enough to work ?!?!

[mjennings3.9]

So guys Ive been doing some research, I have a few questions hoping to see if someone can help. So i just recently joined 60DegreeV6 forum, and I was reading and noticing that a lot of LZ9 guys get rid of the LZ9 intake manifold, and switch it with a ported LZ4 intake manifold and also upgrade using the throttle body converter, to the GM truck 5.3L throttle body. I'm trying to figure out is this because they are t get rid of the 3.9's dual runner or variable length design, one set of long runners for improved torque at low rpm but switches to short runners for high rpm flow due to not understanding how to tune with it, or because a Ported LZ4 manifold is actually more beneficial ?? I don't know what to think ?? If it is more beneficial, think WAMS will tune for it ??

http://wot-tech.com/shop/gm-60v6/intake/fuel/3500-manifolds/cat_96.html

http://www.tcemotorsports.com/index.php?page=shop.product_details&flypage=shop.flypage&product_id=30&category_id=7&manufacturer_id=0&option=com_virtuemart&Itemid=26

[G6KinG19]

Re: Crazy enough to work ?!?!

First of all the intake manifold that you are looking at in WOT is for LX9 engines not the LZ4 engine
secondly using Throttle Body Adapter - 75mm <-------- need more info

[mjennings3.9]

Re: Crazy enough to work ?!?!

First of all the intake manifold that you are looking at in WOT is for LX9 engines not the LZ4 engine
secondly using Throttle Body Adapter - 75mm <-------- need more info

http://60degreev6.com/forum/showthread.php/50617-3-9L-LZ9-87-IROC-Z28-GT4088-turbo/page4#showthread.php/50617-3-9L-LZ9-87-IROC-Z28-GT4088-turbo/page4?forcenoajax=1

If you look at this forum he shows that manifold on a lz9 also the second link was a throttle body adapter it converts the stock manifold to fit a gm 5.3l

[G6KinG19]

Re: Crazy enough to work ?!?!

wow i am shock that the lx9 fits on a lz9 so that means it will also fit the lz4 because the lz4 and lz9 are basically the same
but can explain how that throttle body adapter works?

[mjennings3.9]

Re: Crazy enough to work ?!?!

wow i am shock that the lx9 fits on a lz9 so that means it will also fit the lz4 because the lz4 and lz9 are basically the same
but can explain how that throttle body adapter works?

Pretty much this is how it works, you take the existing throttlebody off attach this adapter to the manifold, and then attach a gm truck 5.3 throttle body, then reattach the wire, apparently they use the same throttle buy wire adapters so it works nicely must be the truck though not the ls4

[G6KinG19]

Re: Crazy enough to work ?!?!

wow i really would like to know the gains from it cuz if its worth i might just do that
because its a easy mod to do

[Rannin Ravensight]

Re: Crazy enough to work ?!?!

Typically speaking (and if anyone knows better than me, please speak up) a dual plane intake helps you get more usable power in the low rpms while sacrificing a little on the top end. Single plane intakes increase peak power but at the expense of useful power for the street. In short, changing to a different intake manifold changes your power curve.

[mjennings3.9]

Re: Crazy enough to work ?!?!

Typically speaking (and if anyone knows better than me, please speak up) a dual plane intake helps you get more usable power in the low rpms while sacrificing a little on the top end. Single plane intakes increase peak power but at the expense of useful power for the street. In short, changing to a different intake manifold changes your power curve.

I do see your point and even the site does state you will lose slight low end torque but in the end if you port everything in the end your gonna pick that low end up back up in the top end also if you think of a lz9 at 2500 it's tips it's torque curve at 6000 it tops it's hp according to what I read anyways, that means in a drag race setting... Your only at 2500 grand in first gear after that it's all higher Rpms in each gear. At least that's my exsper with my particular car. But I could be wrong right now I'm doing test in physics to test drag of my car so will but for now I'm focused on hookup and pick up. Which is why I'm interested in this.

[Rannin Ravensight]

Re: Crazy enough to work ?!?!

Don't get me wrong, I think in your situation you should go for it. Straight pipe exhaust would also get you peak power while sacrificing low end, just nobody's doing that for the street.

This is all very generalized as well. The power curve would really depend on how long your intake runners are and the volume of the manifold.

[G6KinG19]

Re: Crazy enough to work ?!?!

i see you guys point on this
this will only work for drag racing not an everyday car use

[slpg6]

Re: Crazy enough to work ?!?!

Those mods ain't going to hurt the torque as bad as people might think. It will do great daily driving as long as you get it tuned. I think you'll be more than happy with the results.

[Rannin Ravensight]

Re: Crazy enough to work ?!?!

I put my disclaimers in there "Typically... generally...etc"

Of course you could run without an intake manifold at all, or without exhaust manifolds for that matter. Mostly these parts are designed to make the engine more friendly. But if you're going for the gusto, you should do everything you can to make power.

Also, there is more than 100 years of hot rodding theory out there, but that is no replacement for trial and error. Try stuff and tell us what's working for you. That's just my opinion, mind you.