Why bigger turbos make more power than stock turbos at same PSI

Ok guys..
If you did a turbo upgrade without a fuel system upgrade. Assuming you would have some gains, just not as much as with an upgraded fuel system..

Where would most of the power be? Are you going to see all the power up over the 5-6k rpm?
And would it hurt you 0-3k rpm power??

I'm asking because, if all the extra power is up top and the bottom doesn't see any power or loses some power, this would be a bad mod for a non track daily driver...

Any thoughts would be great..
As far as turbo, I would be looking and the ATP twin turbo upgrade?

Thx
 
bigmoneycloser said:
Ok guys..
If you did a turbo upgrade without a fuel system upgrade. Assuming you would have some gains, just not as much as with an upgraded fuel system..

Where would most of the power be? Are you going to see all the power up over the 5-6k rpm?
And would it hurt you 0-3k rpm power??

I'm asking because, if all the extra power is up top and the bottom doesn't see any power or loses some power, this would be a bad mod for a non track daily driver...

Any thoughts would be great..
As far as turbo, I would be looking and the ATP twin turbo upgrade?

Thx
Click to expand...

With the atp turbo upgradeyoi wont see much if any change in spool and power in the lower rpms. They are still small turbos but reworked to allow them to make more power.
The ones they are talking about causing lag are the single much much larger turbos then the atp upgrades.

No one has yet to push the stock fuel system by itself with upgraded turbos so not sure what gains wpuld be exactly
 
bigmoneycloser said:
Ok guys..
If you did a turbo upgrade without a fuel system upgrade. Assuming you would have some gains, just not as much as with an upgraded fuel system..

Where would most of the power be? Are you going to see all the power up over the 5-6k rpm?
And would it hurt you 0-3k rpm power??

I'm asking because, if all the extra power is up top and the bottom doesn't see any power or loses some power, this would be a bad mod for a non track daily driver...

Any thoughts would be great..
As far as turbo, I would be looking and the ATP twin turbo upgrade?

Thx
Click to expand...
I made all of my power before 5500 RPM even though boost stayed flat across the board.
There's videos and dyno sheets to show where the power was gained in my video I posted.
 
This is a little behind, but I just read the thread.  Anyway, make me smarter please....  Am I right in assuming that the bigger turbo does more because if i compress more air at a time it's more air at the same pressure and because of the volume the pressure (therefore the amount of boost cylinder load) is greater... like having a volume tank on a compressor? That is to say... because more air is more air?
 
I'm in for an ATP turbo upgrade but want to see the gains with only a tune first.

Someone needs to take the plunge.  Just not me!
 
BiGMaC said:
This is a little behind, but I just read the thread.  Anyway, make me smarter please....  Am I right in assuming that the bigger turbo does more because if i compress more air at a time it's more air at the same pressure and because of the volume the pressure (therefore the amount of boost cylinder load) is greater... like having a volume tank on a compressor? That is to say... because more air is more air?
Click to expand...

Woah BigM, I read it twice and still not sure I understand your question ;D So waaay oversimplifying it, an engine is an air pump, move more air and make more power. Turbo's move air and send it back inot the motor, lets say one is a syringe and one is a garden hose, if both are flowing water at 10PSI at the tip are needed to  fill a five gallon bucket, which one fills the bucket faster, syringe or garden hose?
 
Reality is that bigger turbo keeps increased air volume consistent and doesn't lose pressure.  More air at same PSI makes more power...
 
QuickSilver said:
BiGMaC said:
This is a little behind, but I just read the thread.  Anyway, make me smarter please....  Am I right in assuming that the bigger turbo does more because if i compress more air at a time it's more air at the same pressure and because of the volume the pressure (therefore the amount of boost cylinder load) is greater... like having a volume tank on a compressor? That is to say... because more air is more air?
Click to expand...

Woah BigM, I read it twice and still not sure I understand your question ;D So waaay oversimplifying it, an engine is an air pump, move more air and make more power. Turbo's move air and send it back inot the motor, lets say one is a syringe and one is a garden hose, if both are flowing water at 10PSI at the tip are needed to  fill a five gallon bucket, which one fills the bucket faster, syringe or garden hose?
Click to expand...

But the needle is the same size (intake tubing, throttle, plenum)...

I'm trying to wrap my head around it too.
This is my first experience with turbos, and I'm green as can be.

Sent from my SCH-I545 using Tapatalk

 
I think when the air from the turbo hits the smaller "pipe" size it will increase in velocity and still maintain CFMs.  Like a venturi fitting.
 
That's how I thought about it....... so the larger diameter turbo moves air hitting the same pipe (intake valve) as the  smaller one with both at the same pressure.  The air must then move faster from the larger turbo in that pipe to be at the same pressure as that from the smaller turbo.Cylinder size is fixed.. so more air  (boost) gets into the cylinder (combustion chamber)... I think?
 
Yeah, I think.  It's like water pumps.  A bigger pump supplying the same psi on the same size pipe will create higher velocities.  And, when you reduce the pipe size it will increase the velocity. 
 
I haven't had the opportunity to dyno my truck with the bigger turbos on it yet but I do know they make more power.  I play on occasion on the old hwy that goes by my subdivision, it's flat, straight and you can see for at least two miles in either direction.  Before my turbos I was getting 0-60 times of 5.5 sec, now I'm seeing 4.75's 
 
Yeah, its an F150 super crew with 33" mud terrains on it. I bought a set of stock 17" Xlt wheels that I need to get tires for so I can take it to the track this spring.
Launches are pretty bad ass, I just try not to do the 4x4 too often with these heavy ass tires on here. Its done some clunking here and there, almost like the 4wd wasn't fully engaged.
Also this was done over and over previously and after install, same spot in the stretch of road to try and keep it as consistent as possible.
 
It was a good mod for the money, IMO.  Love the look of your SHO Mac, when I was dealing on my truck they had one on the lot that looked similar to yours I was eye balling.
 
Thanks red...  working on a tasteful blackout and the lighting.  Getting ready to make it run a bit quicker... maybe not as fast as your ride.. but quicker.
 
Well from what I can see of the pics in your Sig, you're doing a nice job. I'm sure you'll have no trouble besting my heavy brick when you get into the performance aspect of it, these SHO's are pretty bad.
My truck is black and I've gone with a black/gun metal theme. I need to get the milled part of my wheels done yet and my FX redone (was done before i decided to do gun metal).Had planned on tinting the tails but I just painted the clear edges black which is a subtle but no d changd
 
Sounds awesome, I'm partial to a black vehicle LOL ...until the show my DD was F150-F350.. Love trucks!  Pics please?  :please:

My last F150 FX4 was a flame blue and black theme. I did the Heads and tails by replacing them with the black filled SVT raptor version... pure bolt-on change.
 
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