2008 5.3 Intake on LQ4.

[PitchBlackC3]

Has anybody converted their 4.8, 5.3 or 6.0 to the newer style 5.3 intake. The one with 90mm TB?
The only thing that concerns me before I buy one, is would the fuel rail from a 99-03 truck fit on the 90mm intake?

Does the 90mm truck TB work with the 03 PCM or does it require the converter?

Thanks

[keniff]

youll need the adapter for the TB, the truvk TB is 87mm the TBSS i a 90mm, the LS2 car TB is 90mm

the ECM doesnt care what TB you run as long as te pin-outs in the harness read it correctly.

fuel rails i have no idea...but i honestly dont see why not.

[PitchBlackC3]

I thought there was an issue with the TAC reading the signal from the TB correctly.

I think the fuel rail will work, but hoping someone would know. The rail that is made for this intake would be the returnless style. Maybe I can find out if the 2004 fuel rail is the same part number as the 2008. If so, the 2003 rail should fit on it.

[txarkitekt]

Just curious--why go with the NNBS intake? I know it flows slightly better than the one you have now... But why such the hassle? I would rather go with a FAST product.

[DBRODS]

The crossover on the fuel rails will not clear the newer TBSS style intake.

[keniff]

Just curious--why go with the NNBS intake? I know it flows slightly better than the one you have now... But why such the hassle? I would rather go with a FAST product.

total of 300.00 in parts vs 800+ thatd be my reasoning

[txarkitekt]

Yeah, but the power increase is also higher. If you wanna play, you gotta pay!

[PitchBlackC3]

Well I can get a NNBS intake for virtually nothing along with the TB. I was thinking if the fuel rail would work I go switch to it for little cost and already have the TB set up if I want to switch to a FAST later.
Honestly, I am not even at the point to need to mess with the intake yet. I need to get my exhaust finished, install my converter get a cam in first.
I can get a hold of some 243s pretty cheap too. Would it be worth it to switch my 317s for them? Might help bring up the compression on the LQ4.

I really just need to sit down and figure out my goals for this engine and what mods I need to get there. I know no matter how much power I make I will want to do more, but I am gonna keep it pretty mild.

[txarkitekt]

You what you will, but spending the time/money to get minimal gains from the intake might not be worth it.

Well, if you wanna stay N/A, then go with the 243s on the LQ4. It will bring the compression to about 10.5/10.6:1.

Make sure to match the cam up to your other supporting mods, e.g. stall, intake, heads, etc...

[zeake]

The intake is not worth it. I have done it and barely noticed the difference. I had to have a custom crossover for the rails. Not worth the money.