|
|
|
|
Thread Tools | Display Modes |
05-09-2005, 04:24 PM | #301 |
Scooby Specialist
Member#: 7555
Join Date: Jun 2001
Chapter/Region:
South East
Location: Charlotte NC
|
|
05-09-2005, 04:32 PM | #302 |
Scooby Specialist
Member#: 58647
Join Date: Apr 2004
Chapter/Region:
Tri-State
Location: Here for now...gone tomorrow
Vehicle:02 Exedy Carbon clutches SLIP and SUCK $! |
I remember seeing something like this done years ago in things that should have worked but didn't. His idea looks good but on the switch over from supercharger to turbo How smooth is the swap over? Is the a stuter like when a UTEC is not smoothly tuned or is there a big surge
If it works good it would be the Shiznite but if it don't you just blew a huge chunk of cash |
05-09-2005, 04:52 PM | #303 |
Scooby Specialist
Member#: 7555
Join Date: Jun 2001
Chapter/Region:
South East
Location: Charlotte NC
|
I remember an arrticle in SCC magazine a while back where they did this on a MR2 turbo model. In the end they got rid of the SC'R in favor of just the straight turbo set up. IIRC, they couldn't get the two components to play well together and the turbo ended up making more power alone.
|
05-09-2005, 06:25 PM | #304 |
Scooby Newbie
Member#: 86730
Join Date: May 2005
Chapter/Region:
TXIC
Location: Austin, TX
Vehicle:2005 STi 460 WHP @ 28 PSI |
Oh my, turbo + s/c, awesome!
What I don't understand is why people are saying the S/C is for down low. S/C boost pressure is directly related to rpms - thus they make max boost at max rpms. Now, if this is a roots type s/c like it looks, it still wouldn't be putting out that type of boost down low. My guess is a real small turbo with killer spool plus the s/c to make boost from midrange to up top. |
05-09-2005, 06:36 PM | #305 | |
Scooby Specialist
Member#: 58647
Join Date: Apr 2004
Chapter/Region:
Tri-State
Location: Here for now...gone tomorrow
Vehicle:02 Exedy Carbon clutches SLIP and SUCK $! |
Quote:
|
|
05-09-2005, 06:45 PM | #306 | |
Scooby Newbie
Member#: 62220
Join Date: May 2004
Chapter/Region:
SWIC
Location: Glendale, AZ
Vehicle:'02 WRX '94 Supra |
Quote:
I don't see how this is such an hard idea to grasp, you CAN tune a turbo system around STOCK hardware, the original dyno numbers were done at Dynocomp here in PHX, and after the fuel system was installed the tune/dyno pulls were done at the EXACT same place... call Richard at Dynocomp if you think we are full of crap, ask him about Robert Ansick's STI... I'm sure that he will tell you that they tuned the car with the 550cc injectors and that the A/F ratios were perfect across the board. If you really think about it, it is not mind boggling how someone made a kit and tuned it to Stock specifications (psi) but instead of having crazy pull from a GT35R uptop at about 15-18psi, you have it throughout the whole powerband. I'm not a mechanic or a tuner, but I see this car everyday and it is a BEAST. Not one to mess with, that's for sure. I'll see if I can get a dyno graph from before and after the tune and fuel system... and post them. |
|
05-09-2005, 06:50 PM | #307 | |
Scooby Newbie
Member#: 86730
Join Date: May 2005
Chapter/Region:
TXIC
Location: Austin, TX
Vehicle:2005 STi 460 WHP @ 28 PSI |
Quote:
You are incorrect, sorry. |
|
05-09-2005, 06:56 PM | #308 | |
Scooby Specialist
Member#: 58647
Join Date: Apr 2004
Chapter/Region:
Tri-State
Location: Here for now...gone tomorrow
Vehicle:02 Exedy Carbon clutches SLIP and SUCK $! |
Quote:
A roots style or any mechanical compressor will make boost as soon as you spin it. |
|
05-09-2005, 07:07 PM | #309 |
Scooby Newbie
Member#: 86730
Join Date: May 2005
Chapter/Region:
TXIC
Location: Austin, TX
Vehicle:2005 STi 460 WHP @ 28 PSI |
Perhaps you are right, but I still contest that S/Cs are not made for low-end power.
|
05-09-2005, 07:17 PM | #310 | |
Scooby Newbie
Member#: 56229
Join Date: Feb 2004
Chapter/Region:
MWSOC
Location: Hudsonville, Michigan
Vehicle:2001 Subaru Forester Blue Ridge Pearl |
Quote:
Jon |
|
05-09-2005, 09:48 PM | #311 | |
Scooby Specialist
Member#: 58647
Join Date: Apr 2004
Chapter/Region:
Tri-State
Location: Here for now...gone tomorrow
Vehicle:02 Exedy Carbon clutches SLIP and SUCK $! |
Quote:
[The second type of supercharger utilizes a more efficient design which actually compresses the air as it's drawn through the unit. Some examples of centrifugal blowers are those from Paxton, Vortech Engineering and, to some degree since the air is compressed inside the unit, the Whipple Industries screw-type supercharger. Turbos also fall into this category.] So it can go either way depending on what kind of supercharger you are using. However they are using the S/C for the low end and the Turbo for the top end in this situation. You can look at this page Supercharger FAQ for a quick bit of info on these S/C's. |
|
05-09-2005, 10:26 PM | #312 |
Scooby Specialist
Member#: 7555
Join Date: Jun 2001
Chapter/Region:
South East
Location: Charlotte NC
|
2002 WRX, thanks I was going to explain the SC specifics but looks like you schooled it already
|
05-10-2005, 11:11 AM | #313 | |
Scooby Guru
Member#: 13617
Join Date: Dec 2001
Chapter/Region:
MWSOC
Location: MN
Vehicle:2001 Legacy GT back to stock is a project too |
Quote:
Ben |
|
05-10-2005, 11:57 AM | #314 | |
Scooby Newbie
Member#: 62220
Join Date: May 2004
Chapter/Region:
SWIC
Location: Glendale, AZ
Vehicle:'02 WRX '94 Supra |
Quote:
|
|
06-07-2005, 09:30 PM | #315 |
Scooby Newbie
Member#: 926
Join Date: Feb 2000
Chapter/Region:
South East
Location: Raleigh, NC, USA
|
fyi I cant spell or type:
a roots SC will make plenty of boost at low rpm. I get 14 psi at 1500 rpm ( well as low an RPM as I can let the clutch out under load anyway) in my SC mr2. a lysholm SC is very efficient, as are the cyntrifical paxton / ati / vortech ones that have impellers like a turbo. the lyshom will let you make boost from idel to redline, the cyntrifical has to get going fast enough to produce bost so wont create boost till a certain engine rpm. All SC's have parasitic loss that turbos do not have, so even at 80% the lysholm falls short of the turbo at 70% because this is a measure of compressor eficiency.. not overall system efficiency. main goal of a twincharge system is to make more power than a turbo only system over a larger rpm band. How can you accompliosh this.. *must* disengange SC once the turbo is spooled, and must use a bigger turbo than the tubo only setup. if you run your SC at 14 psi on a STI motor you can spool a turbo that is sized for a 5 liter motor.. and you can run a large turbine housing, and end up with boost pressure higher than backpressure. All the Sc ends up being is a spool up aid.. that aids so much yu can run a much larger turbo than a turbo only setup. The limit becomes compresor surge feeding a 2.5l motor.. imagine a big GT40 spoled at 3k rpm.. it is gong to surge like crazy. |
06-07-2005, 10:10 PM | #316 |
Scooby Specialist
Member#: 63605
Join Date: Jun 2004
Chapter/Region:
SWIC
Location: Moms...yours
Vehicle:04 Wrx Wgn TimeAtk 10 Golf TDI, 08 Stang GT |
i'll just say that this car truly is a daily driver...matter of fact, he joined us az scoobies on a recent day long cruise up north. the car runs killer, smooth and the owner is very knowledgable. and yes, call dynocomp and ask about the car, rich would love to give some info.
|
06-07-2005, 10:38 PM | #317 |
Scooby Specialist
Member#: 24447
Join Date: Sep 2002
Chapter/Region:
SWIC
Location: Tucson, Arizona
Vehicle:2016 Mustang GT w/PP Red |
It has been a daily driver for a long time now too. Makes me feel very confident that my STI will handle anything I throw at it (with in reason).
Ryan |
06-08-2005, 12:29 AM | #318 |
Scooby Specialist
Member#: 84809
Join Date: Apr 2005
Location: Germantown, WI.
Vehicle:2005 Forester XT Black |
Superchargers make nearly instant low-end power. Just about any kind you'd care to try. I have drag raced B, C and D/GS cars for many years, as well as other supercharged classes, with my brother-in-law. The GMC 8/71 was always my favorite. Of course it won't fit under your hood.
Anyway, back on topic. One of the german car manufacturers has announced a regular production model that uses twin forced-air induction, with a supercharger and turbo. I wish I could find the article; I think it was Mercedes, but I'm not sure. [Deleted image of our supercharged drag car.... not a Suby] Last edited by Balr14; 06-08-2005 at 01:14 AM. |
06-08-2005, 07:38 AM | #319 |
Scooby Specialist
Member#: 51537
Join Date: Dec 2003
Vehicle:2004 WRB WRX STI 62 Corvette/11 Cherokee L |
One of the things that's left out is how much heat turbos create underneath the hood, contributing to engine performance. Also, efficiency of a "turburu" is less because of the distance of piping from the headers to the turbo, unlike other setups like the evo for instance. In terms of overall efficiency this is something that often not factored in. This is why I think a twin screw like a kenne bell, or whipple, maybe better overall for pump gas setups. The twin-screws may have theoretically less peak efficiency than a turbo, but they can be more efficient over a broader range of PR and CFM. It would be interesting to see how an excellent twin-screw like a kenne bell or whipple supercharger would compare to say a stock vf39 for power under the curve.
|
06-08-2005, 08:21 AM | #320 | |
Scooby Specialist
Member#: 7555
Join Date: Jun 2001
Chapter/Region:
South East
Location: Charlotte NC
|
Quote:
I'm imagining compressor surge. |
|
06-08-2005, 09:04 AM | #321 |
Scooby Newbie
Member#: 926
Join Date: Feb 2000
Chapter/Region:
South East
Location: Raleigh, NC, USA
|
haha was it good for you too?
|
06-08-2005, 10:53 PM | #322 |
Scooby Newbie
Member#: 28568
Join Date: Nov 2002
Chapter/Region:
SWIC
Location: mesa,AZ.
Vehicle:09 G8 GXP silver/silver |
July issue of Car and Driver,page32. VW is about to produce a twin charge 1.4 lt good for about 168hp. This is from the magazine.
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Compound charged , fully built . | FATCanuck | Proven Power Bragging | 670 | 10-19-2012 05:22 PM |
RENNTech Mercedes-Benz C 63 AMG with 548-hp | AVANTI R5 | Non-Subaru News & Rumors | 1 | 09-05-2008 12:33 PM |
FS: Compound Charged 2004 STi | AaronB | Private Vehicle 'For Sale' Classifieds | 22 | 01-06-2007 03:04 AM |
Compound charging stock STI? | Bc Rich | Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo) | 21 | 08-03-2006 01:33 AM |
R-Compounds for STi | DonA | Motorsports | 27 | 04-30-2004 01:42 AM |