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Intake manifold swap?

Meethead

By Meethead
in Engines & Drivetrain

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Nasty Senior Enthusiast

Nasty

Posted
Posted

I understand but more isn't always better. There's something called backpressure

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MiamiSilverado1500 Enthusiast

MiamiSilverado1500

Posted
Posted

So doing some conversion math here because I hate the metric system... This is for the air intake setup if I was to go with the AirRaid "build it kit".

 

L83 throttle body 80mm = 3-5/32 inches

 

L86/LT1 87mm = 3-27/64 inches

 

Aftermarket example 90mm = 3-35/64 inches

 

Aftermarket example 100mm = 3-15/16...literally 4in.

 

 

For reference...

 

3.5in = 88.89mm

 

4in = 101.6mm.

 

This kit comes up to 6in in diameter. Obviously too big for my needs but nice that they make it in so many different variations.

Nasty Senior Enthusiast

Nasty

Posted
Posted

3.75 coupler fits both throttle body if that's what you're trying to figure out. If you want to use tuning. You.get 4" with a reducer coupling

Nasty Senior Enthusiast

Nasty

Posted
Posted

I could understand if you had a big block. But the 5.3 isn't very big. It can only take in so much. If you have straight through, it's not gonna help anything other than annoy you and everyone else.

MiamiSilverado1500 Enthusiast

MiamiSilverado1500

Posted
Posted

3.75 coupler fits both throttle body if that's what you're trying to figure out. If you want to use tuning. You.get 4" with a reducer coupling

 

Are you saying tuning or tubing?? Just want to be clear.

3.75 coupler fits both throttle body if that's what you're trying to figure out. If you want to use tuning. You.get 4" with a reducer coupling

 

Are you saying tuning or tubing?? Just want to be clear.

Nasty Senior Enthusiast

Nasty

Posted
Posted

You're wanting to do your own intake pipe? Use 4" with a reducer and each end

MiamiSilverado1500 Enthusiast

MiamiSilverado1500

Posted
Posted

I could understand if you had a big block. But the 5.3 isn't very big. It can only take in so much. If you have straight through, it's not gonna help anything other than annoy you and everyone else.

 

Just want to squeeze out as much as I can out of a 5.3 without a cam or SC

Nasty Senior Enthusiast

Nasty

Posted
Posted

Then don't do catless. It will probablyhurt you

MiamiSilverado1500 Enthusiast

MiamiSilverado1500

Posted
Posted

You're wanting to do your own intake pipe? Use 4" with a reducer and each end

 

Kind of like how my MIT tube looks now. the mid section of the tubing is wider than the inlet/outlet. I wonder what would be appropriate, size wise. Would have to measure the mid section of my MIT tube to find out.

MiamiSilverado1500 Enthusiast

MiamiSilverado1500

Posted
Posted

Then don't do catless. It will probablyhurt you

 

I was figuring catless but with a muffler where the 3rd cat/mid resonator is. To handle the back pressure yet still have good flow characteristics.

Nasty Senior Enthusiast

Nasty

Posted
Posted

Catted headers. Pull the 3rd cat and add a muffler.

 

Again it's a small motor. Not a built big block

ruby15z71 Enthusiast

ruby15z71

Posted
Posted

I think you all are confused.

 

1) Miami there is no need to do this diy custom intake. Your intake flows plenty for what you want. Any bigger will simply be pointless. (Whipple and Maggie Superchargers use a similar designed tube like the airaid you have and connect to stock air box. Your DIY intake is absolutely pointless and won't net any gains over the airaid really. Waste of money and time.

 

2) there is no such think as back pressure. It's a 5.3L direct injected motor with a shit ton of computers to control everything. Backpressure does nothing and is a myth. What you might be referring to is scavanging which is based on the flow from each bank and is what. Helps improve performance and squeeze every little bit of power and tq out. The absolute best scenario for exhaust is really dependent on what you want. However, a 3.5" exhaust on a 5.3 is too much. The L86/6.2 comes with a 3.5" exhaust from factory and any and every aftermarket kit is 3.5". The 5.3 is 2.75" from factory and everybafter market kit is 3". Why? Cause 3" exhaust for a 5.3 flows plenty.

 

3) continuing with 2), ARH, Stainless Works, Kooks, Or TSP are top notch brands for LT headers. If you are wanting optimal flow I suggest Stainless works. They use a different design where the LTs have catted (non catted as well) mid pipes and then meet but do not y together. If you go that route you then have a shop connect pipe at each end and run to an X pipe to 2 mufflers to and basically have a true dual exhaust that flows great. Or you can use any brand LTs and go with a catted y or off-road y (non catted) and run a single 3" pipe to a muffler and then exit. Either way will be optimal for your goals. You don't need a muffler if you don't want and can run straight headers by I will tell you now it sounds like ass, is extremely loud, and is annoying. I've been through this multiple times on the forum and fb from reading through to talking to people who have done it.

 

4) As for muffler you want a straight flow through design for couple reasons... one being that the straigh flow through will allow for the optimal air flow out of the motor. Another is because it reduce any drone there might be. There's a reason Borla, Corsa, Magnaflow are leaders in performance exhaust cause they bet most gains. Theybflow so much better and please stay away from flowmaster. The chambered exhaust design hinders performance and flows worse than factory or close to same (doesn't matter what series exhaust) so it's pointless to use. Also the chambered design creates massive in cab drone which is super annoying. You want loud with optimal performance but a nice exhaust note check out Carven or Black Widow Race Venom mufflers. Both are tiny bullet style flow through Designs but have decent exhaust notes and sound good.

 

You guys are overthinking this. An example of a 5.3 bolt on to achieve its max potential would consist of a CAI (Airaid MIT/aFe Momentum GT, S&B, Volant, Corsa), a 3" cat back (Borla, magnaflow, corsa, Gibson, etc...any would be fine as long as the muffler is a true flow through design) a set of LTs with or without cats, L86 intake manifold, and LT1 throttle body with a 93/e85 custom tune from a reputible tuner using HPTuners. This will give you the most for your truck and be the best bang for your truck (Last 2 things would be to either do gears or put a stall in to help with low end and while they will help the costs imo of doing them don't out weight other options). From this point the only other mods to be done would be boost in a bottle/spray (Nitrous), going FI with a turbo or supercharger, or going with a cam.

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