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Supercharger or Turbo?
- Thread starter us74k5
- Start date
BlackBourbon
1/2 ton status
-S/C is gonna net power off the bottom of the rpm's all the way up but rob some to function.
-Turbo is powered by exhaust so no parasitic loss but won't be there in the lowend unless it is a smaller snail that spools pretty quickly.
both are cool and have their advantages. plus they are both way better than they used to be back in the day design wise.
-Turbo is powered by exhaust so no parasitic loss but won't be there in the lowend unless it is a smaller snail that spools pretty quickly.
both are cool and have their advantages. plus they are both way better than they used to be back in the day design wise.
I vote turbo but two of them!!!
DEMON44
Low-Tech Redneck
I know theres cheap ebay kits for twin turbos. seen one for a SBF. yes somethings had to be "tweeked' for proper fit but in the end it works great. and damn cheap.
DEMON44
Low-Tech Redneck
I dunno don't rule out properly sized twins.
search for our Ck5 user RigPigonjuice. or somthing like that. he twin turbo'd his mud truck. put some shake down vids of it up somewhere but i can't find them.
it goes man it goes.
search for our Ck5 user RigPigonjuice. or somthing like that. he twin turbo'd his mud truck. put some shake down vids of it up somewhere but i can't find them.
it goes man it goes.
Oh I know they go... I have seen a 77 chevy with twin turbo's on them. Was pushing somewhere around 1200hp. I dont want to be pushing more than 500HP from my engine, and with premium gas it was already around 400 at the flywheel. I just dont need that much, I dont want to blow parts up.
badmix
1/2 ton status
I would go Turbo. If you really study how they are designed (the whole system), its really easy to put together. Ive seen ppl do some cheap junkyard systems and they did it safely and netted some big gains (on ricers). The biggest thing in both applications (S/C or Turbo) is getting the extra fuel and regulating it. Ive seen some even go as far as add an injector to inject fuel when under boost, almost like spraying nitrous, etc. There are many ways to do it jus have to research.
BlackBourbon
1/2 ton status
veddy impotant grasshoppa
Dunno much about the 'pane systems, but with gas I'd go turbos with FI or a SC with a carb. It is harder to get turbos working right with a carb, but unless you are drag racing, I like the way turbos work better than a super charger (build boost with load instead of with RPM) Everybody thinks turbos are only for high HP in gas applications, but you can make monster torque with a well thought out turbo system (why would it be any different than diesel?). Turbos can be trickier to get to fit though.
wasted wages
1 ton status
I'm partial to .....
But that's just me.....
couple of points.....It takes a LOT of air and fuel to feed a blown setup..I run 2- 750 holleys - 1500 total CFM..and this is just a GM 454 HO crate motor with nothing done to it at all. large fuel lines and fuel pumps are going to be needed also....
turbo vs blower.....turbo lag sucks...turbo boost always comes in at the wrong time...it's like sticking your hand in a hornets nest...nothing happens for a second then BAM !!
I found that with a loose torque converter,( 2200-2400 stall ) the boost of the blower is always on tap...as soon as the throttle blades crack open it's making boost...stomp the pedal to the floor from a dead stop and hold on !!! power on tap w/ no waiting.....my little setup makes more horsepower than I can ever use...it is underdriven 6% - makes about 6lbs of boost. It makes enough power to twist 3" driveshafts,,break 2 transmission cases, grenade a detroit in a 14 bolt FF.
If I switch the pulleys from top to bottom and overdrive the blower 6% it will make 12 lbs of boost.and lots of horsepower....probably too much for the bottom end to live very long...
Oh,,,and use a rev limiter!!....if you have your foot buried in it and the driveline breaks...it will rev to the moon before you can react and let off the pedal....
now the down side.....carbs don't like sidehills,,,uphills or down hills...
BUT,,with a little skill and carb tweaking ( holley float kits,,vent tube bleed lines with x-overs and drains) I made them work OK,,, but still not great.
someday I may switch over to EFI...
Right now I have the setup removed from the engine ( I turned the truck into a truggy ) and I am just running a single 800 CFM JET Quadrajet...it works OK,, but I sure miss the boost...
But that's just me.....
couple of points.....It takes a LOT of air and fuel to feed a blown setup..I run 2- 750 holleys - 1500 total CFM..and this is just a GM 454 HO crate motor with nothing done to it at all. large fuel lines and fuel pumps are going to be needed also....
turbo vs blower.....turbo lag sucks...turbo boost always comes in at the wrong time...it's like sticking your hand in a hornets nest...nothing happens for a second then BAM !!
I found that with a loose torque converter,( 2200-2400 stall ) the boost of the blower is always on tap...as soon as the throttle blades crack open it's making boost...stomp the pedal to the floor from a dead stop and hold on !!! power on tap w/ no waiting.....my little setup makes more horsepower than I can ever use...it is underdriven 6% - makes about 6lbs of boost. It makes enough power to twist 3" driveshafts,,break 2 transmission cases, grenade a detroit in a 14 bolt FF.
If I switch the pulleys from top to bottom and overdrive the blower 6% it will make 12 lbs of boost.and lots of horsepower....probably too much for the bottom end to live very long...
Oh,,,and use a rev limiter!!....if you have your foot buried in it and the driveline breaks...it will rev to the moon before you can react and let off the pedal....
now the down side.....carbs don't like sidehills,,,uphills or down hills...
BUT,,with a little skill and carb tweaking ( holley float kits,,vent tube bleed lines with x-overs and drains) I made them work OK,,, but still not great.
someday I may switch over to EFI...
Right now I have the setup removed from the engine ( I turned the truck into a truggy ) and I am just running a single 800 CFM JET Quadrajet...it works OK,, but I sure miss the boost...
Well as I stated earlier in the post, I am running propane. Its a dual impco 425 setup. Which is plenty of fuel. Also no problems with tipping over, etc. I am thinking I will go supercharger due to the simplicity, and on tap low end power.
wasted wages
1 ton status
PM me when you get it done,,,I would be very interested in the 'pane conversion...
One thing bothers me about blown w/ propane...and that's the explosion factor if it backfires....I have a relief plate on the intake...It doesn't look sufficient to relieve a full on backfire thru the intake,,should something happen.
I've had mine sneeze a time or two, and the pop off did it's job ( on gasoline )
but with propane,,,i'm not so sure it wouldn't lift the blower off....the bolts holding the blower to the manifold are designed to fail at 14 -15 ftlbs of torque..to prevent the housing from becoming a bomb....
One thing bothers me about blown w/ propane...and that's the explosion factor if it backfires....I have a relief plate on the intake...It doesn't look sufficient to relieve a full on backfire thru the intake,,should something happen.
I've had mine sneeze a time or two, and the pop off did it's job ( on gasoline )
but with propane,,,i'm not so sure it wouldn't lift the blower off....the bolts holding the blower to the manifold are designed to fail at 14 -15 ftlbs of torque..to prevent the housing from becoming a bomb....
Jessie James
1/2 ton status
You should pick up the book Maximum Boost by Corky Bell. It's an amazing book that goes into great detail about turbo and superchargers, yet is very easy to read and easy to understand. By the time you get done reading it, you will be an expert on force fed engines.
Twin turbo's, one small one big. Small to boost the bottom end torque, big one to make it scream down the highway. Half throttle most of the time and you won't have a problem with turbo lag. Plus, I love the sound of turbo's
Jessie James
1/2 ton status
But it is also slightly limited - you cannot run an intercooler which means you have to tune very carefully to avoid detonation.
That is a very complex setup. However, two appropriately and same-sized turbos would probably work VERY well. Add in an intercooler and you can achieve a lot of power.Twin turbo's, one small one big. Small to boost the bottom end torque, big one to make it scream down the highway. Half throttle most of the time and you won't have a problem with turbo lag. Plus, I love the sound of turbo's
Of course, in all cases, you have to be careful to supply enough fuel so you don't run too lean because that kills forced induction engines very, very fast!
Isn't this backwards?
Personally, I would prefer the performance of blower on a truck (for the monster low end and consistent boost over rpm) and a turbo on a car (for the big power). However, the install of a turbo leaves more flexibility, especially for using an intercooler. On a supercharged setup, you just keep stacking the parts up until half of it is above the fenders.
