My compound turbo set-up

[ApexVIII]

nice work! im stoked to see how it works out!!

 

[KGB Pilot125]

No, I'll be able to measure the work of each turbo my using two boost gauges (already mentioned this somewhere in this thread). I already have them in the dash. One will measure at the outlet of the 60-1 and the other will measure manifold pressure. And yes, I will have to do a bit of math to figure the 16g's individual output, but it's pretty simple stuff.


94awdcoupe - Quit posting about how things WILL work and problems that WILL occur. You're passing your theory off as fact and it's rather annoying. Unless you can show me how YOU'VE done this before and how it worked out for YOU.

Dont let anyone here discourge you, I think its awesome that someone is thinking outside the box and trying something new. At work today I was showing all the guys and everyone there (4 suby WRX guys) is excited about seeing the results.

 

[hdoerr]

My humble opinion is that if this setup makes just 300hp it is a great success. It would mean that the only thing wrong is the choice of turbos but I really don't see how it won't work toward your intended goals. Diesels are a bit different but the way they spool turbos and move oxygen is no different than any other internal combustion engine. I hope you shut all of these nay sayers up.

 

[gob4sho89]

Even if the setup only makes 300hp, it would have a crazy torque and hp curve, or should I say line...

 

[jrohner]

Even if the setup only makes 300hp, it would have a crazy torque and hp curve, or should I say line...

Um... my car would have a crazy torque/hp curve too at only 300hp. Set the boost curve so I never get more than 300hp, and I'd have a flat 300hp from 3300 to 8 grand.

 

[99gst_racer]

Since the bigger turbo is feeding the smaller then it is safe to assume it would build up pressure in the pipe between the inlet and outlet.

Yes, most definitely.

Do you think it is possible that the output in that pipe may be lower than the actual output of the turbo since the other is drawing in air ? It would seem to me that there would be some pressure drop equal to the work / draw of the smaller.

I'm not sure if it works that way. But even if it did, I'd bet that the 'draw' of the B16G is less than 1 in/hg. Interesting point though.

Is it necessary for the smaller turbo to recompress the largers air ? Or would the final lbs/min be the same if they fed the motor like a twin setup ?

It's my understanding that the majority of the work being done is the smaller turbo re-compressing the larger turbo's air charge. This is how the final air charge becomes so dense (basically more mass in the same volume). I'm not 100% sure what the lbs/min output is going to be in relation to another type of set-up.

 

[viperlp01]

You drive it yet Paul??? How close are you.. A lot of people i have talked about just don't understand it and it seems like a lot of people on here don't, either...

 

[gstryyder]

i don't get how people wouldn't understand it... pretty simple stuff...makes sense to me. i keep peeking my head in to hear how this thing is going. and i just want to see how this project is coming along. can't wait to see it when it's all mounted up!

 

[99gst_racer]

No, the car isn't complete yet. I've been slacking.

I just got the radiator back in, so I can put the turbos back in tonight and connect the plumbing. I need to fab some of the exhaust system still, fill fluids, finish the electrical, fix a leaky injector 0-ring, etc... All little boring things that I've been putting off.

And in recent news, I had a light ballast fall from the ceiling in the garage. Half of it landed on my head , and the other half on the engine bay. Lots of broken glass scattered around my engine bay and down in the timing belt cover. Now, I get to take all of that apart tonight to fish out shards of glass. FUN!

 

[RipperXX]

Well that sucks, at least it doesn't sound like you got cut.

 

[Black_Bullet]

Im not even going to get into trying to fully understand all this compound charging stuff but I just wanted to say good luck , make sure you do some videos and dynos when you get it running, also because I am interesting in how the Kelfords work out for you as well.

 

[99gst_racer]

These Kelfords are going to kick some ass. I sent the 272 specs over to my buddy who did my cylinder head work, and he said they should perform very well. Did you ever figure out which springs you're going with?

 

[99gst_racer]

Stage 2?

Just so everyone is clear, there's no staged "transition" from one turbo to the other being that they're both always functioning and working toward the overall output.

 

[talontd92tsi]

You are trying to utilize the best of both compressors here, the quick spool of the 16g, and the top end of the 60-1 here right. With the added benefit of neither compressor working as hard as 1 would by itself to reach your desired boost level.

Correct?

 

[99gst_racer]

^^^ Yup, pretty much.

 

[GofaST4life]

I understand this...and im really excited to see where this goes...my hats off to you Paul.

 

[talontd92tsi]

^^^ Yup, pretty much.

Sweet.... If this thing works flawlessly it is going to be sick.

 

[Black_Bullet]

These Kelfords are going to kick some ass. I sent the 272 specs over to my buddy who did my cylinder head work, and he said they should perform very well. Did you ever figure out which springs you're going with?

pm'ed

 

[99gst_racer]

so my funny didn't even get a laugh... why so serious

You forgot the emoticon.

 

[AWD_Hybrid]

Hi Paul. I've been watching this thread, but not able to post until making
it to a proven member. If you don't mind a sugestion, the b16g comp
entry can be milled as close to a 7deg taper to the wheel as possable.
A 7deg entry & a 12deg expansion has been flow bench measurements
in my head for years. It is an easy mod & might help the compounding.
Another thought in my head for you is 1 twisted blade in the pipe blowing
into the b16g comp. My reasoning is to give the air coming from the large
comp a directional spin to continue matching the b16g's spining direction.
I know it sounds like an ebay spiral pos, but in your case, you don't want
air hitting the b16g comp blade at an inconsistant directional spin. I think
your compounding system looks a goer. About the only thing I see neg, is
the b16g bearings will need checking for ware more offten than a single T.
I've never heard of a wheel (meaning the comp wheel) designed to suck
in & be blown at to spin. Thumbs up for all the DIY & time put in.
Cheers !

 

[94awdcoupe]

You must be logged in to view this image or video.

 

[Calan]

Wow...does that thing do continuous "stoppies" while rolling down the highway?

 

[99gst_racer]

Any updates?

Headed out to the garage right now. I'll have updates tonight. Will be firing it up on Tuesday probably.

 

[dsm-onster]

You must be logged in to view this image or video.

That's an sequential setup not a compound

 

[94awdcoupe]

That's an sequential setup not a compound

Looks like a one way valve on the inlet of big turbo. small turbo feeds compressed air to big turbo/engine. Looks to me like its compound during spool up. Then the small turbo is bypassed and it becomes big single. I thought it ingenious. but what do I know..