air cleaner question

99xcss4 · Mar 7, 2023

Canadian Rust Bucket said:
What is the benefit to changing to the vortex fuel pump in a TBI?
The TBI takes 13 psi max and the vortex puts out ~60 psi if my quick google is right.
Not trying to be judgemental, just wondering why this would be a mod worth doing.

there were 2 fuel system for the 454 a low psi and a high psi the low one 87-93 regular and 90-92 454ss uses same fuel pump as 4.3 305 and 350 the high psi system uses a pump that operates between 25 and 32 and use injectors that flow 90lbs prh this system is found on 94-95 regular and 93 454ss look at post #3 on this thread https://www.gmfullsize.com/threads/454-tbi-vs-454-vortec.59727/

99xcss4 · Mar 7, 2023

L31MaxExpress said:
Flow and pressure. Those of us running healthy TBI setups run 20-30+ PSI. The TBI pump barely pushes enough fuel for a stock engine and often the pressure drops at WOT.

bingo we have a winner! and I not think but could be wrong the high psi fuel pump found in 93 454ss and 94-95 2500 3500 trucks with 454 is close to half the flow rate and psi of the vortec pump.

99xcss4 · Mar 7, 2023

Schurkey I have a 94 454 its stock air cleaner was not modified it never had the flap in the air cleaner base. I am going to have dig out that old carb air clean and see how good the filter and lid fit the 94 base. I am not the sharpest tool in the shed but I do know enough to be dangerous (haha) I could have been miss lead but I had all ways thought the bigger the air filter element the better.

99xcss4 · Mar 7, 2023

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this good straight ducking

99xcss4 · Mar 7, 2023

these are bad bad because they have the silencer baffles

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99xcss4 · Mar 7, 2023

Rock Hard Concrete said:
I'm just gonna leave this here to counter the old men who hate everything:

Every 'waste of time hot air intake' I have ever personally done has improved the flow of the intake, especially at part throttle. Most notably was in my old pt cruiser; that had a fender intake that necked down to the size of a quarter, and going to a large element filter and ditching the stock airbox made a significant difference.

My old tbi 350 gained some, my 4.3 v6 gained quite a bit (but that sits right behind the grill and doesn't get much hot air at all), and my 454 tbi seemed to gain the least, but that engine is just a freakin gutless turd to begin with. Going from a system where the air has to change shape & volume multiple times to a direct intake straight over the throttle body has, in my experience, been worth it.

An aftermarket large bore true cold air intake with 1 bend and no shape shifting would be absolute best but manufacturers want way to much money for those.

My 2c, most will disagree with me and that's okay.

I have thought about getting a carb/throttle body hat and and some 4'' tubing and making own system that rests the filter on the passenger side wheel well with a heat shield

df2x4 · Mar 7, 2023

Rock Hard Concrete said:
My old tbi 350 gained some, my 4.3 v6 gained quite a bit (but that sits right behind the grill and doesn't get much hot air at all), and my 454 tbi seemed to gain the least, but that engine is just a freakin gutless turd to begin with. Going from a system where the air has to change shape & volume multiple times to a direct intake straight over the throttle body has, in my experience, been worth it.

Do you have any before/after dyno sheets to back up these claims? I seriously doubt any of these setups provided any notable gains if these were stock engines.

IMO unless you're doing serious modifications to the engine the stock intake is the best option for these trucks. If you do need more air, I'd get a Volant intake kit. Those are the only aftermarket intakes for these trucks that I'm aware of that use a sealed box and draw cool air from the factory fender opening.

I removed a K&N FIPK intake kit from my red '97 and went back to a factory intake because the K&N raised my intake air temps significantly.

99xcss4 · Mar 7, 2023

this is not real world (under hood) conditions but it dose show some thing maybe with these figures some one can give under closed hood number. enjoy

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df2x4 · Mar 7, 2023

Rock Hard Concrete said:
I can feel the difference.

I thought the same thing when I put the K&N on my red truck a decade ago. It took me a few years to mature enough to realize that feeling was a placebo effect I put in my own head to justify spending $300 on a downgrade.

454cid · Mar 8, 2023

Louder does not mean faster.

air cleaner question

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