InfamousKindaThinkin

Would porting a LS4 intake make a big difference on a all stock LS4, should i stick with porting my intake now or just upgrade to a LS1/2/6, if i upgrade i understand that i need to use LS6 rails correct?

The_Madcat

There are plenty of threads to help you with this on gmls4.com.

InfamousKindaThinkin

I understand that. Thats were i came from. Still got the same question.

91parkave

iTrader: (4)

Nobody to date has data on bench flow numbers of the ls4 intake vs ported....Mel as on gmls4 had his done recently so maybe he could hook u up with some type of data....but for the 300 he paid to have it ported you could have a ls6 and another 20-60 for a vlom tray and you could easily be where u need to be.

baltsk8er69

iTrader: (1)

There's no worthwhile benefit at that price. The restriction is the neck and that can't be changed enough by porting. An ls1/6 mani swap doubles the opening. That's where the full rpm spectrum power is gained. Please don't wast your money.

InfamousKindaThinkin

Has anyone tried or done this with an LS2

baltsk8er69

iTrader: (1)

Yes. The ls6 mani is cheaper and same gains.

lVloses

iTrader: (1)

A ported LS2 would outflow the LS6 intake. But get a 90mm snout on the LS6 and the LS6 is back on top.

DavidGXP

iTrader: (14)

Very well put. A ported LS4 is a waste of money. (no offense to Mel:devil)

Brian396

iTrader: (3)

https://ls1tech.com/forums/ls4-perfo...s2-intake.html

InfamousKindaThinkin

Sounds great, i was thinking of using a FAST intake LS6/1 which ever i could get cheaper, but if that doesn't happen i was thinking just get an LS6 intake, should i port this or keep it oem, i sure the gains will be enough to wake my car up lol......other then that do i have to use LS6 rails, and injectors (because there are the closest to LS4 ratings, and one last question lol can i use what TB i want.......just get the car tuned of course


Thanks

lVloses

iTrader: (1)

Porting a LS6 intake doesn't gain you much. You can use the LS4 rail and injectors but you will have to cut into the top of your manifold if you go that route. It's much easier if you just use the LS6 rails and injectors. Lastly you need to get Brian's TB adapter so you can use your stock TB on the new intake manifold.

InfamousKindaThinkin

would i be able to use any kinda LS6 TB, or do i have to use my stock LS4 one? i understand that i may need the adapter anyways if i upgrade my headers

91parkave

iTrader: (4)

LS6 is cable operated your car uses drive by wire which involves no throttle cable...stock ls4 tb or a ls2 tb will work

InfamousKindaThinkin

True i dont think a new tb will make a difference anyways im not make more then 400hp

Brian396

iTrader: (3)

Op kind of a silly question, but have you read thru this thread? https://ls1tech.com/forums/ls4-perfo...ap-sticky.html


I don't think so.
As far as I know a 90 mm TB off an '09 truck will work with a repin. I don't know of anyone who has actually done it, but the testing I did with the one I have says it'll work. Rockauto has that TB for $83. If you can get an LS2 intake for cheap the 90mm truck will bolt right to it.

Mels SS

iTrader: (1)

I'm crushed David LOL It did help a lot to port the intake though the car runs Awesome and look incredible!!!

baltsk8er69

iTrader: (1)

If its free its great if it cost more than 100 bucks its a total waste. Not worth the minimal gains. An ls1 swap picks up 10-15 hp and Thats with doubling the intake opening. You cant tell me shaving 1/16 of material and still keeping the small neck opening gains anything over 5 hp...and I believe thats stretching it. To me it would be like flaring.the ends of an exhaust system and saying it improves flow. There's still a major restriction. Go with an ls1 manifold swap. It can be done fairly cheap. And it gives you a nice bump from idle to redline not just peak hp. It's the best mod I have by far.

brandonwittheimp

Can anyone here fab me ls1 manifold swap?? If so how much??and install to?

BlackImpSS

iTrader: (1)

Brian, in your other post you said this TB wasn't good for boost. I was wondering if you knew why that was. I might be picking up a ls2 manifold for cheap and when installing the cartuning kit I figured I would try getting that intake on there at the same time.

Hopefully the trans and shortblock stay together at 10 psi for atleast 1 season.