is it possible or has anyone installed 2 turbos 2 downpipes seperate one for left and right bank of the engine? Pros cons?

because my stock GM8 works great the shaft play is still perfect.. and i have an extra one in the garage

thanks
brian

Room is the biggest obstacle, ABS controls, steering shaft, brake master cyl are all going to be in the way of a turbo on that side. Arguably little to gain from a twin setup as well, although I must admit just the phrase 'twin turbos' does make it attractive ;)

If you run two turbo's with two seperate exhausts you will not obtain any more boost and you will take forever to spool up, because you will only be sending 1/2 the exhaust through each. To get a performance advantage from dual turbo's you will have to run all the exhaust through both turbo's and one turbo feeding the other, like the dual setup from BD for the cummins.

I'm thinking of adding a pusher for my gm-4. That would be two turbos seriesed on an intercooled 6.5L.

We've got piles of superchargers here, I'm wondering what a turbo feeding a supercharger setup would work like...

There's an engine (the tigershak?) that comes like that for marine/truck use.

Umm..Tex, Can I have one?

I don't know if the ones we have will even work, they're for gas engines in the 4L range, and they're not mine to give away.

There's always Ebay.

Remember though that marine engines have an ocean of coolant, real estate for large air to water IC's, and pumps capable of hundreds of gpm; plus don't forget that block design without going into it is only longevity rated for about about 200-220 hp sustained power, with 13 psi boost max.

Stock engine will handle more, but it will be short lived; have a spare handy, it isn't a matter of if, but when, it will leave you walking home.

Spindrift, Ronnie Joe & even Kennedy can attest to that, I'm probably next victim to more power wanted syndrome myself; just a matter of time, vs. right foot demands, but I'm aready stockpiling my 18:1 parts for the when it happens.

Remember though that marine engines have an ocean of coolantBut they run at full load continously which means they make a lot more heat than they would in a truck.

Agreed,
What I was highlighting was difference to comparing power output and equipment for more power used in Tigershark engine, & turbo-supercharging, can it be done yup it surely can be done/ but for how long was my point.

i have been trying to figure out an exhaust for this for a while

Make a flange to mate to the bottom of turbo2 and then have someone bend the pipe from the output from turbo1 at the rear of the engine to the exhust port on turbo2 and weld the flange on.

problem is there are 2 exhaust inlets on the centre turbo

What am I missing?
Turbo1 has an exhaust inlet from each bank, stock. You can find them at a truck salvage online www.car-parts.com (http://www.car-parts.com) .


All you have to add is a pipe from Turbo1's outlet to the exhaust inlet of turbo2 and from turbo2's intake output to turbo1's intake.

cant put pass side manifold on to feed centre turbo because it already has one there feeding side turbo

That might be the problem and the van exhaust manifolds would be the way to go.

then the other turbo has no place to sit

The exhaust pipe you have to make will hold it and making a bracket might help.

so then use the van or the hummer center style turbo mounting along with the normal truck style and bolt on a cowl hood to clear the center mount turbo. This would work, right? The hummer style turbo1 could then be used to feed the intake truck mounted turbo2 and wha-la, piggy-back 6.5 has been born. Or maybe that could be the other way around. The only way would to be mock it up on a stand and then try it out in the vehicle. This setup would require an intercooler definetly though in order to keep the IAT at a resonable level.

It would require a van/hummer block or heads too. Truck turbo would feed hummer turbo and intercooling would be a must.

The truck turbo would sit on the exhaust pipe from the hummer turbo and a bracket could always be made to brace it.

Now that would be an neat trick, a morphed 6.5 1/2 van and 1/2 truck, I still don't think the engine is up to sustain twin turbo ops, but could be a neat R&D if you have time for that sort of thing.

Dump - literally - both those turbos, run the PowerStroke or DMax turbo in the center-mount position, with a modification of the factory down-pipe from either.

Would seem the sane choice, wouldn't you think?:cool:

Thimk, people!;)

i wish i knew how you spelled that noise lurch used to make on the adams family when he was disgusted

I'm making 10 psi on my intake with an IC at the same RPM I made 15psi at before. A hx-35 might do wonders for me but I'd still like to try adding a pusher first.

So - what are you saying, grape - it would be better with one turbo on EACH bank, with the one in the center, also?

forgive me for my ignorance, so the over all concensus is that a dual turbo set up is not worth it and the only route to go is sequential turbo? becuase the way i was looking at it was yes, theres 1/2 as much power pushing the turbo so its doing half as much work... but at the same time the combined force should be the same (maybe i'm totally off on this one) but i figured it would be less ware on the turbos... and if there was extra lag could nitrous oxide make up for this when its needed?

i might also note. i do occasionaly trailer my suburban, but i'm not a constant tower.. i love my big truck and enjoy the fact that its a diesel, but by no means am i constantly pulling a 10K trailer.. and also i live in ILLINOIS.. i can't remind the last time i saw a "mountain"

Brian

first off you start any turbocharged engine project based on how much power you plan to make. You then pick a compressor wheel that can move enough air for that power at the boost level you'd like. So all you guys who want 2 turbochargers on an engine that exhales the crank right around 300 hp, how much power do you plan to make?

I'm thinking in the near future with lower cr (19:1) and propane and a chip, I'll be able to push 333+. I'm going to use two of what I hve now (gm-4's) and upgrade later.



If the crank falls out I'm getting a cummins to fit in there.

first off you start any turbocharged engine project based on how much power you plan to make. You then pick a compressor wheel that can move enough air for that power at the boost level you'd like. So all you guys who want 2 turbochargers on an engine that exhales the crank right around 300 hp, how much power do you plan to make?
About 299 sounds good to me:joke: :lol:

You're not far off, Bagalac - basically, one turbo on each bank, like Mitsubishi or Nissan lets you use a smaller turbo.
Both compressor outputs feed into the intake manifold.

Cummins, and others, sometimes need one turbo feeding another, for higher Boost levels - 35 to 50-60psi.
The 6.5 does not require those high Boost levels.

If you are using the engine in the picture, pull the GM turbo off, as it restricts the exhaust above 10psi.
Use a center-mounted Dmax or PowerStroke turbo to free up the exhaust, reducing EGT while allowing more effective power output for similar Boost levels.

Use similar plumbing for the front-mounted Ford or GM or Dodge charge-air cooler, as it's already factory bent and installed on those trucks.

Or, use the 6.5 passenger-side-mounted single turbo set-up, with a larger turbo from a Cummins, or equivalent