my turbo project/setup???

[sho_sc]

Or you can think of it this way. You take 2 identically built engines and F/I them, 1 S/C and 1 Turbo ...

Given equal TQ, let's say 400 ft/lbs as measured at the crank:

A S/C SHO is flowing enough air "through" the engine to produce 430 ft/lbs. The injectors (fuel), pistons, rods, and crank are seeing 430 ft/lbs. VE is 210%.

A turbo SHO is flowing enough air "through" the engine to produce 400 ft/lbs. The injectors (fuel), pistons, rods, and crank are seeing 400 ft/lbs. VE is 200%.

The turbo SHO has less VE due to exhaust restriction via turbo.
The S/C SHO looses HP to the crank due to parasitic drag.

 

[Toolman]

It's not engine power it's using.

Oh yes, I forgot, any car you are driving has an endless supply of hot air to power turbo's!

 

[Sho Amo]

funny you picked 430

 

[BlackonBlack89]

It's not engine power it's using.

yes the engine losses power by forcing the gases through the turbine. IOW its robbing the hp. just in a different way. not a belt connectted to a supercharger!!!!!!!!!!!!!!

Think of it this way.
N/A car has 1psi of exhaust gas back flow
blower car has 1.5 psi.
a turbo car would have like 4psi- Thats where the power is loss.

Jason you are slighlty wrong. or atleast phrased something wrong!!!

 

[yamahaSHO]

yes the engine losses power by forcing the gases through the turbine. IOW its robbing the hp. just in a different way. not a belt connectted to a supercharger!!!!!!!!!!!!!!

Think of it this way.
N/A car has 1psi of exhaust gas back flow
blower car has 1.5 psi.
a turbo car would have like 4psi- Thats where the power is loss.

Jason you are slighlty wrong. or atleast phrased something wrong!!!

There are too many variables to make a blanket statement like that.

You're not following me. The extra power isn't being made, then soaked up.

 

[cRaZySHO.]

And thats why nitrous ROCKS!!!!!!!!!! Lol. Sorry I had to throw that into the fire.

 

[93rev2sev]

OK there's only one way to settle this.


Dyno a car without an exhaust system...just a set of headers. Note the resultant power figures.

Now, strap a turbo to the collector and just let it spin. Re-dyno the car. Note the power LOSS

Next, hook the outlet of the turbo to a sealed off volume of about 200 cubic inches, set up a pressure regulator so that the volume will bleed pressures in excess of 10PSI to the atmosphere.

There, you have all of the losses and none of the gains of a turbo...note your power LOSS...

 

[yamahaSHO]

You do that, then claim your loss. You still fail to see what I'm saying, so I quit.

You have to take into the accout the gains and the loss you're NOT seeing on the engine itself. Try your test, it really won't prove anything to a complete running system. The turbo is esentially fighting and feeding itself.

I've said what I have to say, please use Google for the rest.

 

[92sho16]

Whatever the losses of a turbocharged engine are I have alot of doubt that they are even remotely close to that of a supercharged engine. Take note that turbochargers are used in many oem applications to increase gas mileage show me a supercharged car that can do this. I don't believe the turbochargers are completely lossless because nothing is perfect there is always friction, air resistance, etc. I have never heard anybody complain about a turbocharger robbing them of power nor have I read this, maybe I was reading the wrong books at school.

 

[Vnuk1]

The op started out the thread just asking for what Turbo to use for 6-7 PSI and this is what it turned into.

Mr. Madison, what you've just said is one of the most insanely idiotic things I have ever heard. At no point in your rambling, incoherent response were you even close to anything that could be considered a rational thought. Everyone in this room is now dumber for having listened to it. I award you no points, and may God have mercy on your soul.

This is not really helping him very much guys.

 

[93rev2sev]

The engine doesn't spin the supercharger! The alternator does...and the weight of the alternator helps keep it spinning.

 

[AREA 91]

This thread has failed.
I feel sorry for the origional poster.
Mabye he can find some help elsewhere.

To the other's, take your "smack talk" elsewhere.

 

[1995SHO9]

The engine doesn't spin the supercharger! The alternator does...and the weight of the alternator helps keep it spinning.

Learn something new every day huh?

 

[SHO_DOODmorrris]

shit i thought the SC spun the engine... was i ever wrong!

 

[AREA 91]

Learn something new every day huh?

shit i thought the SC spun the engine... was i ever wrong!

While this is funny, I can see how a new member might actually believe you guy's! So for all those looking to learn, neither of these statements are true.

 

[SHO_DOODmorrris]

i wasent joking...




Edit: obv i was joking just clairifying for those who cant read my tone (n00bz)

 

[randy'sho]

yeah this post has been ruined by all of you that started arguing over things that are way off target of the original post that I posted! thanks to all that actually helped or realized that this was way off point!

 

[yamahaSHO]

With all the people complaining, it makes me want to 'smack talk' more. There was actually some pretty good discussion. If you can't comprehend, don't cry... please.

 

[93rev2sev]

Sorry about that, Randy. I'll take the blame on this one. I know you are looking for a turbo head unit model number that will provide you with:

Low spool time
Capable of producing boost from xxxxRPM to 7000+RPM
Readily available

I don't know a lot about the different compressor maps, and toolman didn't give you much help so if I had to guess, I'd pick the smallest one from the biggest engine you can find. A low boost Diesel pickup truck with a 5+ liter engine...This will allow it to spool quickly and still be able to handle large volumes of exhaust gas (cause yer spinning the engine a lot faster than the diesel but it's a lower displacement)

Jonathon chose to use a turbo from a LARGE diesel engine so he could get lots of boost. I have no idea how quickly it spins up for him, but you don't need to go that big for what you've described as a target.

 

[Pro*banshee]

Oh yes, I forgot, any car you are driving has an endless supply of hot air to power turbo's!

What about all the hot air in this thread? Bw hahaha