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Well i get a massive pay rais in June and im very happy about it. And i will most likely get a new car. But keep the civic as a toy. Not till around My birthday in November. Me and a buddy were talking because I want to build a Supercharged k20a3, because I can get EP3 engine and Tranny combos for around $1200 here locally. And we were discussing the posibility of doing a Turbo/Superchared engine jsut to see if we could make it work. We already did a turbo car which is mine. And are working on a Supercharged B18 motor for his 95(basically he is waiting on enough money to buy the supercharger instead of piecing together a turbo kit form his garage so his engine is just sitting there.) I have seen the STi that they did this to and know it would be a tunnign nightmare. But if its a toy you think it is worth it. I also have a nitrious setup already. So maybe tap that into the IC. Yeah I know 3 power adders on one engine is playing with blowing up, but I would be redoing the internals, and it would be a cool thing to say you have

CLiff notes turbo and supercharger on a built EP3 engine, and anyways its will work well with proper tunning?

 
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I wouldn't do supercharger, turbo and nitrous. SC and Turbo should be more than enough. You will have boost all the time and lots of power at any rpm.

 
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I'm not saying i would run all 3, im jsut realy considersing superchargeing an EP3 a built engine, and getting an LSD and calling it a day. But how would a setup like this work? i guess the supercharger would be spooling the turbo? Which would mean you could run a bigger turbo and have boost at low rpm's? I'm just curious.

 
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The supercharger should be running like normal, and the turbo would blow into the supercharger. You should be able to get enough boost from the supercharger at low rpm to make up for the boost the turbo has yet to output. Then when it gets up to speed the turbo compresses the air going into the supercharger.
My only question is that at higher rpm is the supercharger compressing the air MORE, on top of what the turbo has already done?

 
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Thats a good question. Liek how would you exactly measure the boost it produces? Like would 7psi of supercharger and 10 psi of turbo equal 17 at top end or something? Or would the turbo cancel out the supercharger at top end? As I said it would be a tunning nightmare.

 
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i was talking about this with a guy i work with. how would you combat the 2 pressures working against each other. the only way i can see it working is using the super charger to spool the turbo then you could run a large turbo with no turbo lag, and you wouldnt have the turbo in the exhaust path. you would have less heat than a normally turbod car also.

 
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but thenn again how would a supercharger spool a turbo? seeing as it spools the engine from sucking in air and all the pressure it produces is jammed right into the engine.

 
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Use a Centrifugal type blower.... it would work the same as twin sequentials. Blow the S/Ced air into the turbo inlet at 5 or 6 pounds, then compress it more with a turbo.
I don't know if I'd use a roots blower to do a SC/Turbo setup, down low, it would be forced to suck through the turbo, then up high you'd be backing up the turbo with it. Use the turbo as the high stage compressor, use the SC as the low stage.

 
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Nothing is gonan happen until november at the earliest when i get a daily driver anyways, so ima do some research.

 
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i haven seen the same thing done with 2 turbos.. a really small turbo for the low rpms then a big one for the top end

 
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Twin Charging eh? I posted this thread up elsewhere. It really yeilds no signifacant beinifit from what i found out.

 
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Yeah, but it sure is cool
I saw it on an sti too, I think the one i saw had two turbos and a s/c! I might have seen one iwth just a single turbo and s/c as well though, cannot remember.


check this out:
http://www.autoblog.com/2005/08/23/v...-turbo-engine/

http://forums.corvetteforum.com/show...98&forum_id=87

There are two gt30 turbos and one amg supercharger on that STI, it gets 6mpg!

 
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nitrous cooled IC, with the above 2, and your good to go, lol. With tons of tuning as you know. The last Subaru cruise I went on, there was a supercharged/turbo wrx. It was sick. Musta been such a nightmare to tune, as I hear they are. Can definately be done though on a built motor. As a toy for reliability sake....cuz you know how reliable it would be.

 
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You woun't see any real HP gains, but the power curve would be awsome!
This was done in the dark ages (before car computers)

 
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Yeah i know. ITs an interesting concept, but ide rather just go with a Step boost kind of system. Ie. 4psi in 1st, 8 in second. and so on and so forth. I cant remember the name right now having brian fart. Spent all day in the attick running surround sound for the parents.

 
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why not just CO2 then? Nitrous is a waste if its going to be sprayed and won't even get into the engine. CO2 is cold enough to do the job, can be had nearly anywhere, and is really cheap

 
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ok, if you had a supercharger that made 7psi and a turbo that made 10psi. and lets say the turbo goes to the supercharger. that would not make 17psi, because the 10psi going into the supercharger isnt going to stay at that because the supercharger can only make 7psi..so the air would just pass through it. thats how i see it...i maybe way off, just thought i would input.

 
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Link here: http://www.k20a.org/forum/showthread.php?t=8993&page=17

So i was browsing K20A.org and found this. WTF over?



I think i want this now

 
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the wastegate to the turbo would open at 10 psi, sot there would never be more than 10 psi in the system. the most efficient thing for this setup would be for the supercharger pully to dissengage at an rpm where the turbo is making full boost so that it doesnt interfere with top-end power. that way, you would have the best of both worlds. a supercharger that would never choke out, and the benefits of the high-rpm power from a turbo.

 
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there was an 5 issue article on this in import tuner with that guy who work with chris rado for his celica.they twin charger a mr2 and got it to work if i were u i would try to find those issues i know i have them some were if u want to know the issue #.

 
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Ok well one of my friends in Clemson has a EG hatch with a B18 and it is twincharged. It works by having a bypass valve. What you so is have the supercharger work as normal. Once the turbo gets over 12 psi the valve opens and the compressed turbo air bypasses the supercharger and goes into the engine. It is the same as twin turbo systems except they replace the small (LP) turbo with a supercharger. It works really well. From 3k to 9k the Tq curve is completly flat. Right now the engine is goin to 2.1L. Once he finishes tuning it im sure hell have a Dyno ill post. I can't wait to see it running in SM at nationals.

 
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do it. it will kill any turbo lag you think you will have.

 
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there was also an article on it a while ago in a prelude with an h22. this is a viable option but it wouldnt be ideal for racing. if your building a street car that is just fun to drive then yeah go for it. but you can build a higher power level with just one. of course it will help with you torque and power at lower rpms but it all depends on how you build the motor and what you are using it for

 
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You can spray to spool. Great drag set-up.........

With S/C, Turbo and Nitro........YOU HAD BETTER HAVE STRONG INTERNALS, GREAT FUEL DELIVERY TOO, Top Knoch EMS & A HELL OF A TUNE ON IT. NO SKIMPING OUT ON THIS SET-UP. Your looking at realisitically $10-20K to do it and do it right.

 
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Or you could skip all this and work on an anti-lag turbo set up? Might be a little loud and not street leagal. But hey it would be fun!

 
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i thought that was the point of the supercharger. to kill any lag for the turbo

 
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That is the point of the super, athough you can use timing to kill trubo lag. Creating an anti lag system. Its not really street leagle, but it pushes fuel in to the exsahust manifold witch in turn creates an explotion keeping the turbo spooled up. Makes a lot of popping out the exsauhst pipe.

 
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There are consequences to that type of tune.