Different kind of twin turbo's

[BigDan3131]

Since I plan to buy an inline six powered truck here shortly I was wondering if you can do a twin turbo setup like they do on diesel engines feeding one into another?
Has anyone ever tried it? As usual Google is no help.

[mcmlxix]

Usually a small turbo spools into a bigger turbo... try this link for a place to start...

http://www.12bolt.com/

Check out this video... it may lead to more answers.
https://www.youtube.com/watch?v=GKJxmGBmldo

[BR3W CITY]

Originally Posted by BigDan3131

Since I plan to buy an inline six powered truck here shortly I was wondering if you can do a twin turbo setup like they do on diesel engines feeding one into another?
Has anyone ever tried it? As usual Google is no help.

Compound Turbo Charging. You can do it on anything, but on a small displacement motor you're limited on what turbo's can be used.

How big of an I6, the usual 200-something?

You need to find turbo's that complement each other well. Unless this new motor is going to be heavily built for boost, you probably won't be seeing full boost on the larger turbo very often. You might actually have a more driveable setup on a single.

It may be doable with a little t25 into something bigger, but you also don't want to be over spinning the little turbo all day and creating a ton of heat.

The diesels that use compound turbo's are doing so on 6+ liters of displacement, sprite-bottle sized cylinders milled into chunks of cast iron that can see 50+ psi of boost.

[BigDan3131]

The newest episode of Vegas Rat Rods they built a tiny 4 cylinder diesel out of a backhoe and that's where I got the idea.

Besides it was just a thought and it would be something different to look at since the truck will have a heavy amount of real patina...maybe the four cylinder diesel isn't such a bad idea after all...you never know

[BR3W CITY]

Oh I'm all for the idea, and I'll gladly help where I can. I just think that the biggest thing that you'll run into is the pre-engineering.

Like I said tho, what I6 is this going on? There are a few running around the forum with carb'd single turbo I6's.

[BigDan3131]

The 64 C10 I'm buying in a week. Forget the diesel thing after all the ranting and raving in an old thread someone has, forget it and the truck has a 250 in it but in the back of the bed is a low mile 4.3l V6 and both the 700r4 and a 5 speed. When my S10 was new it was my bro's truck and with performance goodies he was maxing out at 30mpg freeway.

[BR3W CITY]

Well the I6 would be a "cooler" project IMO than the 4.3
Turbo'ing the 4.3 is so easy its cheating, since its just a matter of stealing sbc parts to work....plus there actually IS 4.3 turbo aftermarket support from guys trying to build SyTy replicas and such.

I'd say grab a couple thickness's of head gaskets (something nice like an mls or a copper) and start working a setup for the 250.

Are you up to building a manifold, or do you wanna mod something? I'd say going with a tubular header like this pic I stole, and then modifying the collector for t3/t4 flange. The idea being to start with a smaller a/r and smaller trim, maybe something like a 48mm .48AR, and going up to Maybe something like a 58-60 .63, which would usually both still be T3 flanged.


I'm not sure at what point you'll start floating valves in the 250, so you'd need to track down some better springs, and decide exactly how far you want to push it. The turbos above are capable of making over 300hp each, so combined you could see anywhere from 350-700+. They CAN be pushed to high numbers, but most the I6 guys that do it aren't doing so on stock motor wonders.

But hell, make some decisions on where you want to head with this thing....and we can make something work.

[BigDan3131]

Well I have to get the truck first and get it running again before I do anything else. But don't worry I'll let you know

[BR3W CITY]

Originally Posted by BigDan3131

Well I have to get the truck first and get it running again before I do anything else. But don't worry I'll let you know

Turbo it first, that way you only have to get it running once


K thats actually terrible advice lol./

[vin63]

Originally Posted by BigDan3131

Since I plan to buy an inline six powered truck here shortly I was wondering if you can do a twin turbo setup like they do on diesel engines feeding one into another?
Has anyone ever tried it? As usual Google is no help.

Brett, on this forum, runs a compound set up (2 into 1) on his Duramax for some incredible drag race performance. For your project (inline 6 cylinder on gasoline), I would consider running a sequential turbo configuration so that you can run on the smaller primary unit for part throttle driving, and then have the second unit available for full throttle. This will require an additional exhaust and compressor bypass control, but will help cut down on some heat and some complex tuning to stay ahead of detonation.

[BigDan3131]

Well...this project will have to sit idle until I find another truck. The deal isn't going to happen since it has no title and the windshield is trashed.