Remote Turbo Setup & Falcon Sixes?

[Crustang to Mustang]

This is something I've been thinking of for a little while. Theoretically, could someone with a Falcon 6 powered car (Mustang in this case) potentially get their hands on a used stock V8 dual exhaust system, that someone else had upgraded from, and convert this system for a remote turbo setup using the passenger side of the exhaust system (obviously), installing a turbo to it up behind the rear valence, ducting the turbo outlet across to the driver's side and back up that side of the "exhaust", into an intercooler under the radiator, and finally into the engine? I know that was a lot but bare with me. I know there are age old debates over whether rear-mount turbos are worth it or not, but if this could be done for cheap, it could offer a realistic option for people with limited recources.

 

[aussie7mains]

Dont do it, the heat loss going down to the back would be huge, turbo needs HEAT. piping should be a short as possible. Aftercooler not needed untill your up around 10psi manifold pressure, especially if draw through petrol.

 

[pmuller9]

One of the problems with the rear mount turbocharger is the oil return to the engines oil pan.
It needs to be pumped back with a reliable electric oil pump
The other problem is finding room for the turbo and associated parts under the rear of the Mustang.

STS made rear mount turbocharger kits for years.
The ones I've seen in operation have a fair amount of lag time.
If you don't mind waiting for boost...

 

[Crustang to Mustang]

Don't do it, the heat loss going down to the back would be huge, turbo needs HEAT. piping should be a short as possible. Aftercooler not needed until your up around 10psi manifold pressure, especially if draw through petrol.

I had just seen a thread on the Ford Truck Enthusiast Forum about a sleeper F100 powered by a 300ci with a turbo setup like the one I mentioned and thought, "If it worked for a truck, why not a Mustang?" The guy may even be on this forum. I haven't looked much at the big six threads, seeing as I don't have one, so I wouldn't know if he is a member or not.
https://www.ford-trucks.com/forums/1393610-79-f-100-turbo-300-6-sleeper.html#post15578945

 

[pmuller9]

The Ford truck has a lot more room in the back of the vehicle than an early Mustang.
In both videos, did you notice how long it took to spool the turbocharger and to get the truck rolling?

 

[Crustang to Mustang]

The Ford truck has a lot more room in the back of the vehicle than an early Mustang.
In both videos, did you notice how long it took to spool the turbochargers and to get the truck rolling?

I understand that it isn't ideal. But is it worth it compared to N/A? Or would it even potentially save enough money to worry about? That last question is especially specific so I don't expect an answer but if someone has the answer I'll take what I can get.

 

[pmuller9]

I don't know.

The turbocharger system consists of:
Turbocharger
Wastegate
Oil return system
Blow through carburetor
Ignition timing controller.
Boost referenced fuel system.
All of the plumbing to and from the turbocharger.

You would be looking at a 50% gain in power with a power lag.

Compared to what it would take for a 50% power gain N/A with instant power.

Typically, a better breathing head and intake manifold.
Bigger carburetor
Cam and lifters
Header

 

[Crustang to Mustang]

I don't know.

The turbocharger system consists of:
Turbocharger
Wastegate
Oil return system
Blow through carburetor
Ignition timing controller.
Boost referenced fuel system.
All of the plumbing to and from the turbocharger.

You would be looking at a 50% gain in power with a power lag.

Compared to what it would take for a 50% power gain N/A with instant power.

Typically, a better breathing head and intake manifold.
Bigger carburetor
Cam and lifters
Header

A better breathing head and intake are out of the question right now, I was planning on this being a large log build.

Another question I have is (and I'm not doubting the wisdom of an experienced member. I'm just trying to get the concepts sorted out in my head) is a vacuum created in the pipes or something to cause the lag? If not, it seems like whether you have a 2 ft. pipe full of air or a 10 ft. pipe full of air (turbo input or output), the only thing that has to happen is the pressurizing of the air. I could see this causing a little lag if the turbo isn't sized correctly but not enough to matter. If it is a vacuum and the turbo has to fill the pipe before pressurizing, I definitely understand how that would cause lag. But then again, I am very inexperienced in this department, that is why I ask so many questions.

 

[pmuller9]

You are correct about the pipe volume for both the intake and exhaust system having to be pressurized.
An 8 ft length of 2.5" pipe has a volume of 470 cu in.
An 8 ft length of 3" pipe is 680 cu in.
The exhaust pipe going to the turbo needs to be pressurized as well as the intake pipe going from the turbo to the intake manifold.

Then figure the exhaust volume that you lose as it cools traveling down the long pipe to the turbo.

 

[Crustang to Mustang]

You are correct about the pipe volume for both the intake and exhaust system having to be pressurized.
An 8 ft length of 2.5" pipe has a volume of 470 cu in.
An 8 ft length of 3" pipe is 680 cu in.
The exhaust pipe going to the turbo needs to be pressurized as well as the intake pipe going from the turbo to the intake manifold.

Then figure the exhaust volume that you lose as it cools traveling down the long pipe to the turbo.

So essentially the engine would have to put out more exhaust to spin the rear-mount turbo and then the turbo would have to work harder to pressurize the intake pipe up to the front of the car and that is what causes the lag. I know that there is not enough room in the back of a Mustang for this but just for the sake of learning, if you were to install small twin-turbos in the back, this could potentially reduce lag?

 

[powerband]

as mentioned earlier, it's the expanding HOT gases that give Turbo efficiency. Usually turbo is placed as close to manifold's exh valve exit as can be managed.
.
... still , if someone will try a 'remote' setup on a small block six it will be fun to see results. I've found any power adder setup ultimately requires a lot more work and modification (usually not anticipated), than finding a suitable turbo ... (I do have a couple of TO3's left from the draw thru project... )
.
have fun
.

 

[pmuller9]

So essentially the engine would have to put out more exhaust to spin the rear-mount turbo and then the turbo would have to work harder to pressurize the intake pipe up to the front of the car and that is what causes the lag. I know that there is not enough room in the back of a Mustang for this but just for the sake of learning, if you were to install small twin-turbos in the back, this could potentially reduce lag?

Maybe a little but that adds too much complexity for just a little gain.

I would still encourage you to do a remote turbo.
It will improve response if you use stainless exhaust piping and wrap it well with heat shielding.

Are you going to run headers or keep the stock log exhaust manifold?

 

[powerband]

... also there's no reason the Turbo has to go all the way back somewhere. Already some OEM turbo's are more accessible on a lift from below. Reshaping the passenger side firewall/DS Tunnel/ floor a little could open up some simple possibilities.
.
have fun


.
.

 

[Crustang to Mustang]

Maybe a little but that adds too much complexity for just a little gain.

I would still encourage you to do a remote turbo.
It will improve response if you use stainless exhaust piping and wrap it well with heat shielding.

Are you going to run headers or keep the stock log exhaust manifold?

I was going to run some cheap Ebay dual outlet headers with a 2-into-1 collector for this application.

 

[Crustang to Mustang]

... also there's no reason the Turbo has to go all the way back somewhere. Already some OEM turbo's are more accessible on a lift from below. Reshaping the passenger side firewall/DS Tunnel/ floor a little could open up some simple possibilities.
.
have fun


.
.

I have considered placing a turbo low in the passenger side back corner of the engine compartment and running pipe underneath the oil pan.

Also, a neat concept I have thought up that is more for Mustangs in general (V8 or L6) is a custom widebody kit that makes accommodations for placing twin turbos in the c-scoop area. I would try it if I had some experience making custom wide body kits. One would probably also have to lose back window functionality but I haven't thought that far yet.

 

[pmuller9]

I was going to run some cheap Ebay dual outlet headers with a 2-into-1 collector for this application.

That will work.
Wrap the headers and all of the pipes going back to the turbocharger.

 

[Crustang to Mustang]

That will work.
Wrap the headers and all of the pipes going back to the turbocharger.

Is header paint just as effective as wrap? Any experience there?

 

[pmuller9]

Is header paint just as effective as wrap? Any experience there?

No
A good thermal wrap would let you touch the header pipe.

 

[curts56]

Here's an interesting YouTube video regarding remote mount turbos: