LS4 Performance - LS2 intake too big for LS4?

I know the swap sticky is for the LS1/LS6 which are 5.7L. I bought an LS2 intake but the project isn't up and running. Much like any engine, does anyone think the 6.0L intake is too big for the 5.3? Will it kill the low end? I will still be using the stock TB to maintain the DBW. IMO, the TB is plenty big, just that LS4 intake throat is obviously too small. Thanks.

the ls2 should be fine, just not many people use it because they can find an ls1 or ls6 which is better.
to my understanding / opinion
ls4<ls2<ls1<ls6

What he said. If your wanting better hp gains ls6/ls1 is the way to go, but the LS2 intake would be one of a kind... your call.

LS2 intake with the 90mm TB flows between the LS1 and LS6 intakes. a 90mm LS6 would be best option, followed by 78mm LS6, the LS2, then LS1...

LS2 intake with the 90mm TB flows between the LS1 and LS6 intakes. a 90mm LS6 would be best option, followed by 78mm LS6, the LS2, then LS1...

x2

IMHO you can never have too much intake on this car. all the low end power even at stock levels is unusable with the traction handicap. I'm getting ready to do a whole drivetrain build with a 6T75 trans, and either an LS2 or 5.3L aluminum truck block. and I intend on trading as much low end as I can for high rpm screamin HP thats actually usable with this car. Im gonna go with an LS6 intake either way because of the throttle body options, a truck 5.3 DBW throttle body is almost plug and play.

to V8IMPSS- Let me clarify my application. I'm building a '65 Corvair with a LS4/Porsche 997 trans(6speed)/ C5 Vette suspension configuration. Will be a rear engine configuration. If I have any traction issues, it will be because I'm going sideways. I'm actually keeping the HP kinda low. This trans has a 3.9:1 first gear, and I'd like to be able to use it. While most people use HP to go fast, I'll be using gearing....

I used the LS4 because of it's initial cost and compact size vs. LS1. On the WP I save a couple inches at least. Sounds like the LS2 will be just right. One of the reasons I got the LS2 is because the connectors for the injectors are the same (I believe). Also the LS2 is a less desired intake so it was cheaper.

a truck 5.3 DBW throttle body is almost plug and play.

I don't think so.

I don't think so.

Care to elaborate?

It's a 3 bolt TB like the LS1/6 and all you have to do to make it work is get the new connector and put the wires in it, when I get home i will add the link to the guy who did it

Care to elaborate?

It's a 3 bolt TB like the LS1/6 and all you have to do to make it work is get the new connector and put the wires in it, when I get home i will add the link to the guy who did it

Sure
http://ls1tech.com/forums/ls4-performance/1398722-truck-3-bolt-throttle-body-ls1-ls6-intake-vid-watch.html

Now if you wanted to run a LS2 intake, I know of a TB that will work for certain years of the LS4.
http://ls1tech.com/forums/ls4-performance/1384690-another-intake-option.html
On a side note I scraped the truck intake.

Sure
http://ls1tech.com/forums/ls4-performance/1398722-truck-3-bolt-throttle-body-ls1-ls6-intake-vid-watch.html

Now if you wanted to run a LS2 intake, I know of a TB that will work for certain years of the LS4.
http://ls1tech.com/forums/ls4-performance/1384690-another-intake-option.html
On a side note I scraped the truck intake.

Why didnt you say that in the first place! Haha. I stand corrected, been a while since I looked into intake/TB/MAF stuff for this car.

I'm assuming that the TB for the LS2 requires the E67 ECU, so '07+....

I was thinking about converting to cable style to save some headaches and have a giant TB beyond porting stock, for less $ than stock.

I'm assuming that the TB for the LS2 requires the E67 ECU, so '07+....



The 90 TB I used was for a newer truck not a LS2. My car is an 06, so I would assume it would only work for the 05-06?

The 90 TB I used was for a newer truck not a LS2. My car is an 06, so I would assume it would only work for the 05-06?

Hmm, alright. But the LS4 TB's didn't change when they switched the ECUs...maybe it would work with both. I'm going to be swapping to the E67 to do the 6A trans, might be back to square 1 with the TB.

Op you seen this thread right?
http://ls1tech.com/forums/ls4-performance/1181851-cammed-gxp-now-has-ls2-intake.html

But the LS4 TB's didn't change when they switched the ECUs...maybe it would work with both.
Different part # between 06 & 07. But idk I haven't had an 07 tb in my hands.

I think I went with the LS2 because it was DBW. I saw someone else did it too so thought why not.

The project isn't running yet and likely won't even have time to fiddle with the new intake in order to make my deadline. pics here

http://www.facebook.com/media/set/?set=a.10150410423292351.388985.714102350&type=3

I bought an LS2 intake but the project isn't up and running.
I will still be using the stock TB to maintain the DBW.

You might find this drawing helpful - it is the location of the bolt holes for a 3/4" thick adapter to mount the LS4 throttle body to the LS2 intake. The outer shape needs to be cut down to match the LS2 intake, but it is a good start.

The challenge with retaining the LS4 throttle body is that the motor assy and connector stick out behind the mounting flange, so you need to offset the LS4 throttle body and use a 3/4" adapter plate to get everything to clear... IN THEORY - haven't made mine yet.

http://i152.photobucket.com/albums/s162/fieroguru/LS4/LS4toLS2.jpg
http://i152.photobucket.com/albums/s162/fieroguru/LS4/IMG_0238.jpg
http://i152.photobucket.com/albums/s162/fieroguru/LS4/IMG_0239.jpg

So what we decided for now is to stick with the stock intake to make my deadline. I'm only going to drive the car for two weeks while I'm on vacation. After that screw around with the intake and such while I head back to Afghanistan. The guy working on my project has been really challenged. Unless something crazy happens, I think he'll make my deadline.

Also, I've been looking at the Holley (forgot the name) self tuning computer. Pricey yes, but plug and play, self tuning, and DBW friendly. Would allow to use the stock TB. The ability to tweak the fuel ratio depending on conditions i.e. track, road trip, winter/summer fuel, etc. Can also buy a pre made LSx harness that plugs into the unit. Would be awesome for guys who have to run in smogged areas.