Compounds - Subaru WRX Forum
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#1 Old 08-23-2013, 03:08 PM
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Compounds

Has anyone heard of someone doing a compound kit on a STI before. there is a rumor i have heard around the Utah area about someone possibly trying it.

Whats the thoughts on it. would it be worth it to do something like that.
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#2 Old 08-23-2013, 03:43 PM
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If you want to completely waste your time and money, sure you can.
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#3 Old 08-23-2013, 04:56 PM
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Compound kit as in turbo and supercharger?

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#4 Old 08-23-2013, 06:14 PM
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Compound turbo.
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#5 Old 08-23-2013, 08:13 PM
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Yeah, probably a waste.

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#6 Old 08-24-2013, 03:45 AM
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The HP-TQ on these setups is awesome. But be prepared to fork out the money on building your motor to handle it first. 30psi is not anything like 14psi.
And make sure you hire somebody good with pipe and how it flows.
Your gonna need to custom make ups, downs IC piping. Gonna need two waste gate setups everything to feed it. Fuel, custom mapping. Two reliable different sized turbos that work well together... And your head on straight enough to realize, things on your car are now gonna break more often than before.

Oh yea, almost forgot... Upwards of 10k to get ya started

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#7 Old 08-24-2013, 08:49 AM
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Not to threadjack, but could you get a smoother power delivery and more low end punch with a duel supercharger/turbo setup? I would imagine even with a compound setup you would have some lag?
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#8 Old 08-24-2013, 09:47 AM
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Quote:
Originally Posted by Haw1es View Post
Not to threadjack, but could you get a smoother power delivery and more low end punch with a duel supercharger/turbo setup? I would imagine even with a compound setup you would have some lag?
You can get better response and low end. But, it's a extreme pain to meddle with and our cars don't have tons of room to shove a supercharger/turbo setup or two different sized turbos under the hood. Sometimes the two turbo system has a lag response between one turbo maxing out and the other one picking up good boost to take over the power delivery. So, expect to pay out the ass experimenting with the setup and things not working or breaking till you get it right.


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#9 Old 08-24-2013, 10:26 AM
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Yea, if money wasn't an issue I would definitely go for it. Mainly to have an engine compartment that looks like this,
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#10 Old 08-24-2013, 06:41 PM
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Originally Posted by Haw1es View Post
Yea, if money wasn't an issue I would definitely go for it. Mainly to have an engine compartment that looks like this,
Haha, that's crammed as shit though.


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#11 Old 08-24-2013, 08:28 PM
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^ so how long to change those spark plugs you say?
FOL

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#12 Old 08-29-2013, 08:26 PM
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If you want to completely waste your time and money, sure you can.
why would this waste your time?? ive heard of them doing it on diesel trucks. they say they spool quicker because of the small turbo and then the big turbo takes over. is that not how it works??
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#13 Old 08-29-2013, 10:16 PM
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Never seen a sti... But there are some guys in the Dsm community doing this... Think about it... Small turbo for low end and spool time, big turbo for top end... Sounds pretty legit to me... Sure you can get 700hp with one turbo... But that bitch won't spool until 6k... I think it's a good idea for people who have money, time, and are into actually racing instead of dyno numbers....
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#14 Old 08-30-2013, 07:48 AM
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Quote:
Originally Posted by Subi101 View Post
why would this waste your time?? ive heard of them doing it on diesel trucks. they say they spool quicker because of the small turbo and then the big turbo takes over. is that not how it works??
This is a sequential turbo setup:

Twin-turbo - Wikipedia, the free encyclopedia

"Sequential turbocharger systems provide a way to decrease turbo lag without compromising ultimate boost output and engine power. Perhaps the most noteworthy application of this system is the fourth-generation Toyota Supra (1993-1998), which is generally regarded as having the most reliable sequential turbo system yet fitted to a production automobile, with a reported failure rate of less than 1% as of 2011"

However, they are more costly and complex (affecting reliability and demanding more design knowledge) than a single turbo setup, and I see little support for sequential setups in the aftermarket industry.

Designed correctly, I'd expect a sequential turbo setup to address the typical performance tradeoffs of; 1.top-end plateau with a small turbo (e.g. OEM WRX, GTI, etc.) and 2. turbo lag of oversized turbos, tailored for high rpm running (e.g. '76 Porsche turbo).

It just may not be worth your while to engineer it yourself.
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Last edited by LW_Black4; 08-30-2013 at 08:36 AM. Reason: Add seq turbo diag
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#15 Old 08-30-2013, 08:31 AM
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Quote:
Originally Posted by Subi101 View Post
why would this waste your time?? ive heard of them doing it on diesel trucks. they say they spool quicker because of the small turbo and then the big turbo takes over. is that not how it works??
No, both turbos will always be working, one doesn't just take over. You will get slower spool up on either turbo individually than you would if you ran either one by itself since the exhaust is being split between them, which is why many cars that come TT stock are converted to single turbo when upgrading. Nor are the results cost efficient.
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