"Rear" Turbo

[RustedRanger]

Anyone seen the turbos that mount in place of the muffler? A while back on Hot Rod TV they put a kit on a Vette that replaced both mufflers with turbos. I am wondering if anyone has seen or put one on a truck? It does seem to make sense because it doesn't have all the underhood plumbing and it doesn't need an intercooler because the intake air cools down going through the long pipe back to the intake. It seems like it would be easier to fabricate a system like this although the kit used an electric pump to circulate oil through the turbos. Also tuning would have to be done to compensate for the boost. I'm not planning anything just curious....but if I had the money....

 

[kunar]

they're known as 'remote mount' setups, and i dont think they usually go that far back in the exhaust... somewhere around the end of the y-pipe or around the cat. the problem with these on a truck is how much mud and dirt they would be subjected to... not good for a turbo

 

[adsm08]

The Trucks guys put a tail-pipe turbo on their one build. It was the time to two guys got two trucks, a Chevy 1500 and a Lighting and they were building them against each other. It wasn't meant to be an off-road truck. They usually get mounted back around the axle.

 

[Downey]

yea they can be mounted anywhere after the cats. hp tv did a vet with them all the way in the back. but not for off roading there a street use only deal

 

[LittleHorse]

As an engineer I think they're kinda stupid, because the exhaust has already lost a lot of it's energy by the time it gets that far down the pipe. Then you've got a 6 foot long pipe full of intake air to compress before the boost reaches the engine. It works, and it's easier to install, but it's far from optimal.

I'd like to see an actual build and dyno comparison using the exact same turbo but one with it way down the tailpipe and one with the turbo within 15" of the cylinder head.

 

[Original_Ranger84]

I think the reason they do that is because they got too many fumes of gas and stuff....

The closer a turbo is to the exit point of the cylinders the faster it will spool up (a. cause the gasses are exiting faster there. B. less air to compress in the intake.) A remote mount turbo is for those who don't have space in the engine bay for the turbos or wanna retain their headers or something...

Mounting it that far back is just plain stupid. that exhaust gas isn't hot, it isn't going fast at all (right after the cats is pushing it for mounting let alone after the restrictive muffler) You would be better off blowing into the intake yourself by then. I mean its kind of the snorkle effect you know (or atleast this is how i think it would work) you have a short snorkle right at the surface and you can breath in and out fairly easily right? now increase that to 15 ft not so easy to breath in is it (weather your in water or not its hard)? now the truck or whatever has to pull air from the engine all the way down the 15 ft of pipe to put it to a turbo that not spinning that fast probably enough to get the air back with very little forced induction. You spend just as much on piping and modifying stuff as it would cost to just get a decent setup for very little if any Hp gains you may even see a drop in power...

Thats all hypothetical but it makes sense to me.

 

[adsm08]

Actually, right after the converter is where the EGT is highest. The converter produces heat. If you have a small enough pipe diameter going back up then you probably don't have much more compressing to do than with a big old CAC.

 

[feellnfroggy]

As an engineer I think they're kinda stupid, because the exhaust has already lost a lot of it's energy by the time it gets that far down the pipe. Then you've got a 6 foot long pipe full of intake air to compress before the boost reaches the engine. It works, and it's easier to install, but it's far from optimal.

I'd like to see an actual build and dyno comparison using the exact same turbo but one with it way down the tailpipe and one with the turbo within 15" of the cylinder head.

As an engineer you know that turbos run off the heat exapansion of the exhaust gasses. So to efficiently run remote turbos you have to properly size that particular impellor and it will work just fine. The same goes with the Cold air side of the turbo. Properly sized it will run fine. Its already been done many times, proving that "turbo lag" can be minimized with this setup as with all others. And the cold air side can stay relatively cooler than an underhood turbo.

It replaces the muffler because the turbo effectively muffles tha exhaust to bearable standards.

The only downside Ive seen with all theprjects in the magazines and shows is the cost of the project as well as potential for damage. But theres enough fabricators here to even minimize that to efficiency.

 

[bcost882]

If you are going to go with a remote mount like that it would probably be easier to go with a procharger type system which is a belt driven turbo and just mount it next to the driveline and run the belt off the drive shaft

 

[Original_Ranger84]

If you are going to go with a remote mount like that it would probably be easier to go with a procharger type system which is a belt driven turbo and just mount it next to the driveline and run the belt off the drive shaft

Thats actually a super charger, A centrafugal supercharger. Plus you can't remote mount it as it has to be in the engine bay anyways. unless you run the belt off the drive shaft lol

A turbo runs off exhaust gas hence the impeller and a supercharger runs off belts.

 

[bcost882]

you get my jist though. That would work well.

 

[bigcountry]

you can look on the v6f150 those 4.2 guys are almost famous for remote mount turbos if you can go to their site and search for some of the guys that have them

 

[LittleHorse]

As an engineer you know that turbos run off the heat exapansion of the exhaust gasses. So to efficiently run remote turbos you have to properly size that particular impellor and it will work just fine. The same goes with the Cold air side of the turbo. Properly sized it will run fine. Its already been done many times, proving that "turbo lag" can be minimized with this setup as with all others. And the cold air side can stay relatively cooler than an underhood turbo.

I disagree that it's as simple a matter of just turbine and compressor selection. The downward motion of the piston doesn't use up all of the expansion of the gas, so the gas is still doing a LOT of expanding up to about 18" down the exhaust system. You can take advantage of this with a normal turbo setup, but it's long gone by the time it gets down to the rear axle, and you've passed through so many feet of pipe and a catalyst so the energy present in the exhaust available for extraction is significantly decreased. You can gain some of that back (but not all) by wrapping your entire exhaust system with heat wrap, as long as you're ok with replacing it every couple years from the wrap trapping moisture and rusting it out.

Turbo lag on a normal engine bay setup is almost exclusively determined by the time it takes the turbo to spool up because the volume of air in the intact tract is so much smaller. On a remote turbo, your unit could spool up instantly and you're still going to have to compress 5+ cubic feet of air before the engine sees any boost, so there's going to be lag regardless of your turbine and compressor selection.

Then, to the answer of sizing your intake smaller so the volume is lower, now you're increasing your pressure drop so you don't get as much boost...then you upsize your turbo to make up for it and you're back to a big laggy turbo.

 

[Frank The Tank]

Thats actually a super charger, A centrafugal supercharger. Plus you can't remote mount it as it has to be in the engine bay anyways. unless you run the belt off the drive shaft lol

A turbo runs off exhaust gas hence the impeller and a supercharger runs off belts.

No.............. it's a belt driven turbo.

a supercharger is belt driven and sits on top of the intake........ a belt driven turbo can be put anywhere it has access to the belt drive, it looks just like a turbo but cut in half.

Frank

 

[Original_Ranger84]

No.............. it's a belt driven turbo.

a supercharger is belt driven and sits on top of the intake........ a belt driven turbo can be put anywhere it has access to the belt drive, it looks just like a turbo but cut in half.

Frank

I can't tell if your just being a tard or if your serious lol

I do know for a fact that is referred to as a Centrafugial supercharger.