5.7 Vortec Upgrade Options

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Supercharged111

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Well sadly I had to pulley down to get 4 psi. The blower is now slightly overspun at WOT. It doesn't make any weird noises, but I have considered taking it apart to get a state of health. Fact of the matter is a 1.6L twin screw is a little undersized for a V8 engine. The 2.3 on my 454 does a bit better and it still spins more slowly than my 1.6 on the 1500. Regardless, I can drag my enclosed trailer locked in OD all the way up here in CO on said 4psi, and were I at a lower elevation I anticipate I'd see a jump of 5-6psi absolute. I'll tell you this boosted 454 doesn't take any **** with the monster camper in the bed and trailer out back, it was significantly meaner back in MI. It nuked the tires on concrete and legitimately put you back in the seat. There's a reason my username is Supercharged111.
 

L31MaxExpress

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Well sadly I had to pulley down to get 4 psi. The blower is now slightly overspun at WOT. It doesn't make any weird noises, but I have considered taking it apart to get a state of health. Fact of the matter is a 1.6L twin screw is a little undersized for a V8 engine. The 2.3 on my 454 does a bit better and it still spins more slowly than my 1.6 on the 1500. Regardless, I can drag my enclosed trailer locked in OD all the way up here in CO on said 4psi, and were I at a lower elevation I anticipate I'd see a jump of 5-6psi absolute. I'll tell you this boosted 454 doesn't take any **** with the monster camper in the bed and trailer out back, it was significantly meaner back in MI. It nuked the tires on concrete and legitimately put you back in the seat. There's a reason my username is Supercharged111.
There is a reason the 383 I am building has good heads and 11:1 compression. A blower would never fit my application and a big block is out of the question without a plasma cutter and welder.
 

Trenton

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Also sounds like it is time to pulley up that little 1.6L. Slip a F/Y car LT1 cam into it and run 10 psi on 93.

Well like I said, I put the blower on around 240k but it only musters 4psi where I'm at. I imagine it'd be 6-7 at lower elevations.

I'm nobody then ;) haha.
250' above sea level here

That's why I like turbos. More boost/power is a flip of a switch away. Tow on 8psi, play on 16psi.


My first dyno session I had ~500ftlb TQ at 3000 rpms in 2nd gear with TC locked.
Small turbo cam, small turbo.

Alright y'all, after driving on Corkscrew Gulch and surrounding trails in southeast Colorado yesterday, I decided I need some kind of forced induction! On ~9° (and steeper) off road, rocky grades at 12000 feet my truck barely has the power to make it up the hills. It's better in 4 low, but I hate having the gas pedal all the way to the floor just to get up a hill lol. I think I'll add a 6 psi Wynjammer and the necessary cam/fuel upgrades.

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b454rat

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OK call me stupid, but how does a centrifugal start at 3K? I was under the impression they are instant, why many believe they are better than a turbo? (reading the pro's and con's between blowers and turbo's). I had a car that had a turbo on it, and was like a light switch, either on or off.
 

Trigger_guard

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OK call me stupid, but how does a centrifugal start at 3K? I was under the impression they are instant, why many believe they are better than a turbo? (reading the pro's and con's between blowers and turbo's). I had a car that had a turbo on it, and was like a light switch, either on or off.
Technically they start instant. But they need to reach a certain RPM to make a certain PSI. If you put this "sweet spot" too low in the rpm range, you'll over-spin the supercharger at higher rpms. This is compounded by the fact that most bolt-on superchargers are small and only designed to deliver 5-6ish psi at sea level.

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Supercharged111

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The PD blower delivers full, or near full boost, at pretty much any RPM. The centrifugal continues building more and more boost until you lift and the point where it begins being useful is generally around 3000 RPMs. On the other hand, you can typically make more peak boost with them than a PD blower. Some people will pulley a centrifugal way down to get it to build boost sooner, then install a restrictor in front it to limit peak boost so the motor doesn't grenade.
 
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