Anyone ever played around with compounding two turbos i.e. one big one small? Everything tells you the combo should produce good power right off idle or damn near and carry out all the way to redline.....But has anyone ever really tried it? Like say a TD04 in front of a CT67? Love to hear experiences and opinions.

 

Wow crickets huh?

 

I think the general consensus is compounds are not needed to make power and have responsiveness. But like most things, if someone wants to invest the time and money then it's doable. There is a guy named Greg Huizenga that built a compound system for his Jeep Cherokee that is badass. Don't see any reason it wouldn't also work on an LS build if you're considering it.

 

Diesels do it...I guess it would work for a gasser ?

 

Compounding? Or are you talking about Sequential? Either way with today's modern turbos and engines there really is no benefit and just a lot of downsides but I guess it all depends on what you are doing with it.

 

Compounds are awesome for vehicles making 50+lbs of boost. At any amount of boost you can reasonably use on an ls, compounds have a ton of drawbacks that range from being a plumbing nightmare to actually making less power. Even some of the top 4 cylinder dragsters just use nitrous to spool a big single instead of hassling with compounds, although I remember a video last year where one of them switched when they decided to up the boost from 80psi to over 100.

 

How about a centrifugal supercharger or turbo feeding a twin screw supercharger?

 

Compounds are useful for high boost levels, it's also doable for gas engines. if you're looking to eliminate lag, there's other ways to approach it without the complexity. I toyed with it in the past.

 

That has been done many times, but generally the supercharger ends up being the restriction when pushed further.

 

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You wanted an Argument? Take a look at the Compressor wheel in Viren's 78/75 NextGen. See there are two sets, small diameter Primary and much larger Secondary set of impeller blades? It IS a Two Stage Compressor.. You should have one just like it.

 

I think you can still take it pretty far though.
There is a local guy here who had a C6 ZR1 with a ported blower and rear mounted 88mm turbo and I want to say he was making something like 1,400 or 1,500hp.

 

That's a good idea

 

Yeah, that's not how it works. That's just one compressor regardless of the configuration of the impeller blades.

 

It depends how you set it up. Gas guys have set up compound setups, but the pressure ratios generally make more boost than the average LS guy needs/wants. That doesn't mean its not effecient or that it woudln't work well if planned out properly. But for most I'd say its alot of time/effort/weight/complexity thats not needed.

You can look up Kevin Jewers setup on yellow bullet. He ran a compound setup on his 2 liter. But he ran 30-50lbs of boost. A few LS guys run those boost levels, but its not common. Kevins setup was able to spool a massive turbo with the help of a little baby unit very quickly and ran less than 1:1 back pressure ratios at "big" boost levels. So it def has its appeal if you plan to push the envelope.

Much easier to to use a large enough turbo(s) to hit your power goal at a 1:1 pressure ratio. Then use nitrous on the transbarake to reach launch boost quick and easy IMO.

https://www.yellowbullet.com/threads...16811/#replies

 

I'm not going through that enormous thread again, but I thought he was making 50lbs just on the 2 step, not total boost?

 

what are the benefits of this?

 

Looks cool and sells a lot of units.

 

It's cheap, it's just a slight variation of another manufacturers design that they copied. It will also make 200-300 horsepower less than other turbos that are available in that particular "size".

 

Its a swept blade design. I see it alot at work with turbine engines. The turbo aftermarket just blindly copied it IMO and its #1 benefit isn’t performance. With turbine applications it was mainly used to increase mechanical strength by reducing stress, vibration, etc. This bumped the life limit on the part slightly. Which is huge with aircraft. It also slightly smooths airflow into the compressor with less losses/drag than a standard straight blade design so it is more efficient as well, but not a massive difference like they play it out to be. Quieter too.

 

hard pass, lol