Anyone have numbers on what an intake manifold swap does for tbi engines?

[Schurkey]

I unfortunately don't have the factory intake. I could possibly track one down

Intake manifold, or air cleaner and ducting?

I'm not super familiar with EGR systems so I'll have to read up on if I want to try to keep it or not.

When the engine is tuned for it, it'll reduce detonation at part-throttle, and it's supposed to improve fuel economy. The manufacturers use it because it reduces peak combustion temperature and therefore reduces tailpipe NOx.

 

[thegawd]

It's something to check anyway - when I get around to it

Here ya go Peter

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[reservoir dog]

Over the weekend I removed a 14" round air cleaner and installed a stock one, tube to fender silencer and all. What a difference in noise or lack of in the cab, much better. I have an edelbrock 2104 intake I've had for years , I'm about to do intake gaskets but will probably go back with stock intake. I can't see an intake making a big difference on a stock engine. Am I wrong? I also have headers I haven't installed , maybe do both?

 

[PlayingWithTBI]

Here ya go Peter

I was thinking about that when I posted it, ha ha. Years ago I had a round wooden "To It" coin, LMAO. Yours is much better.

 

[Schurkey]

Shorty headers made surprisingly little difference on my '88 K1500. I'm told that the OEM-style "Y" Pipe is the bigger bottleneck.

I have a buddy that put Gale Banks headers on his '97 K2500; he said adding two aftermarket mufflers instead of the dual-inlet, dual-outlet OEM muffler made more difference than the headers. The original muffler has big inlet and outlet pipes, but is severely necked-down (restricted) internally.

 

[PlayingWithTBI]

Shorty headers made surprisingly little difference on my '88 K1500. I'm told that the OEM-style "Y" Pipe is the bigger bottleneck.

The stock Y pipe is a big bottleneck but, I would think shorty headers at least help with scavenging through the better flowing Y too.

 

[texas tough]

I sanded and polished the throats of my TBI to a mirror smooth finish , put a 13 lb spring in my fuel pressure regulator and it made a nice improvement. throttle response is better, and gas mileage went up a tad.
heres the thing that many folks forget abt,, this engine is a computer controlled set up. it is programmed to run with what it came with from the factory. unless you get the computer modified to work with the changes you make on the engine, your not going to see much improvements. more likely problems.

 

[PlayingWithTBI]

it is programmed to run with what it came with from the factory. unless you get the computer modified to work with the changes you make on the engine, your not going to see much improvements. more likely problems.

^^^X2 but, a "mail order" tune isn't the way to go. You need to data log, modify your .bin, rinse and repeat until you get it right. Even "identical" setups will behave differently.

 

[reservoir dog]

I sanded and polished the throats of my TBI to a mirror smooth finish , put a 13 lb spring in my fuel pressure regulator and it made a nice improvement. throttle response is better, and gas mileage went up a tad.
heres the thing that many folks forget abt,, this engine is a computer controlled set up. it is programmed to run with what it came with from the factory. unless you get the computer modified to work with the changes you make on the engine, your not going to see much improvements. more likely problems.

That's what I'm afraid of. I have a good, very dependable truck now. I've done the TBI mods, spring, Y pipe and muffler thing already. I would love to swap a hot engine in it but no where to get it tuned or chipped around here. I don't want to go through the learning curve of doing it myself, don't want to have a truck that doesn't run right. Sorry if I hijacked the OP's thread.

 

[PlayingWithTBI]

I would love to swap a hot engine in it but no where to get it tuned or chipped around here

GM left a lot on the table with their tunes. You can make good gains just tuning a "stock" engine, let alone a modified one. Their timing tables are mild, plus there's other tricks you can do to improve mileage and performance.