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07-08-2020, 10:17 AM | #26 | |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
Quote:
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07-08-2020, 12:27 PM | #27 | |
Scooby Newbie
Member#: 434904
Join Date: Nov 2015
Location: Spokane, WA
Vehicle:2002 Impreza WRX WRB |
Quote:
IHI VF24 vs Garrett G25-660. Last edited by tsrapophis; 07-08-2020 at 12:43 PM. |
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07-08-2020, 09:21 PM | #28 |
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Member#: 158864
Join Date: Sep 2007
Location: Aussieland
Vehicle:2003 SOHC destroker |
Yeah they are. They're still waiting on an IWG version. Still.
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07-08-2020, 10:11 PM | #29 |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
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07-10-2020, 04:14 AM | #30 |
Scooby Newbie
Member#: 269226
Join Date: Jan 2011
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07-20-2020, 04:03 PM | #31 |
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Member#: 512816
Join Date: Mar 2020
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I am running this g25 660 on my 1.8L audi TT, and want to swap it onto my foz honestly, especially after reading this. It would spool much better with the 2.5L over the 1.8. I may go for the G25-550 for the audi which would then push me to put it in the foz. I would also need to build the engine which would be a costly process.so really to get it in the foz I would need a FMIC, new inlet, downpipe, possibly intake manfiold...one day!
I would think you should be running the turbo at closer to 27PSI and even above that it gets more efficient. I think these turbos can run in the low to mid 30's safely. |
07-20-2020, 09:32 PM | #32 |
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Member#: 33782
Join Date: Mar 2003
Chapter/Region:
MAIC
Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
I'd love to see a 6258 vs G25-550 comparison on that 1.8.
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07-21-2020, 12:04 AM | #33 |
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Member#: 269226
Join Date: Jan 2011
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The G25-550 really is a better compressor/turbine wheel size match than the G25-660.
This guy had a 660 and swapped to a 550 on his Audi A3. |
07-21-2020, 02:01 AM | #34 |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
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11-03-2020, 06:27 PM | #35 |
Scooby Newbie
Member#: 434904
Join Date: Nov 2015
Location: Spokane, WA
Vehicle:2002 Impreza WRX WRB |
Post Autocross season update! Won my local class season championship (combined SM, SSM, Prep classes and Street Prep classes) Ironed out some new build issues and am preparing for next season.
Things found during season: - Leaking cam seals, resolved - Leaking turbo kit, resolved - inadequate crank case venting Things to do this winter for the Engine setup: - improve Crank case venting. - replace WRX intake manifold with port matched STI manifold, Power drops off at 7200rpm and engine builder has given me the green light for 8000rpm. - Improve water flow in A2W intercooler system. Turns out my intercooler is undersized as well, so there's power left on the table. For now it works but gains 8 degrees of IAT per second and only recovers at about 3.5 degrees per second. The hoses are undersized to try and keep the underhood less busy, but I'm going to have to upsize. Also considering going to an electric water pump made for a small displacement engine's coolant. - Convert to STI hubs/wheel bearings. I blew up 6 rear WRX wheel bearings during the season with 255mm wide 200tw BFG's. Going to do something custom. I'm an engineer and love my car above all, so I'm going to fabricate myself some drop knuckles for my 5x114.3 conversion. The reasons for this are: (1. I can make them to accept bolt in 2008 STI wheel bearings all round instead of just the fronts like GD STI's (2. Going to do a Camaro Brembo brake conversion, The price savings of buying camaro Brembos versus STI brembos is ridiculous. (3. Roll center and bump steer correction. Wise fab makes drop knuckles already but this kind of design exercise is something I enjoy so I don't mind the time invested. Since I have to buy Wheels and tires anyway, I'm going to widebody and go to 285's on 18x10.5 wheels. Stay tuned. |
11-03-2020, 10:34 PM | #36 |
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Member#: 33782
Join Date: Mar 2003
Chapter/Region:
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Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
First of all, congrats!
As another engineer, I like where this is going. I too had been looking into doing my own knuckles for my coupe, with the same thoughts of bolt-in rear bearings. But I'm planning on doing them billet and modular. Sounds like a good call on the core. Curious how steady is the water inlet temps when you're comparing the IAT temps. Wondering if the heat exchanger might be struggling to dump heat to ambient as well. What's wrong with your crankcase? What do you have done as of now? |
11-04-2020, 12:03 AM | #37 |
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Member#: 519491
Join Date: Oct 2020
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I didn't see it in your mod list but with those numbers and with autocrossing, an air oil separator may alleviate some of your crank case pressure issues and at the very least, increase the life of your build.
I'm sure you've considered it; just tossing it out as a +1. After putting mine on, there's no more issues with oil buildup in the intercooler or turbo inlet. Sweet build! |
11-04-2020, 09:34 AM | #38 | ||
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Member#: 80649
Join Date: Jan 2005
Chapter/Region:
South East
Location: Columbia, SC
Vehicle:2000 2.5 Auto-X RSTi Sparkly |
Quote:
I have a DBC JDM STi manifold on the shelf if you're interested I built my own front and rear knuckles about 4-5 years ago now and while it saves money, the weight savings of a good aluminum knuckle is pretty substantial. I gifted my old setup to my 05 daily STi so it doesn't care about the extra weight, but it's still something like 7 lbs per side added. Don't whimp out on wide body stuff. If you want to compete, shoot for at least 315's. A good percentage of SM nationally is on 335's now (including me). Quote:
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11-04-2020, 11:31 AM | #39 |
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Member#: 469585
Join Date: Jun 2017
Chapter/Region:
W. Canada
Vehicle:2009 STi White |
Nice to hear, it's give me some motivation to get my build done. Any idea why your cam seals were leaking?
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11-04-2020, 12:34 PM | #40 |
Scooby Newbie
Member#: 434904
Join Date: Nov 2015
Location: Spokane, WA
Vehicle:2002 Impreza WRX WRB |
So, as far as the crank case pressure goes. I was running a single AOS of my own design that I had setup to mount where my AC comp used to be and drain back into the pan with a ball valve, and it was just undersized. I added an extra AOS mid season to handle just the crank case venting and then the head venting was going to the original AOS. I think this will be fine, except that I bent up some hardlines for the head vents and they are undersized as well. I completely underestimated how much air needs to move there as well as the oil spewing effects of any backpressure whatsoever. I'll go overkill with it and never worry again, easy peasy.
A2W, I do not have water temps yet as I ran out of sensor inputs on my Megasquirt so just IAT. But I have the largest heat exchanger offered on frozen boost (rated 1200hp theoretically) which is always cool to the touch. I never have to spray it between runs or even idle the car for more than 30 seconds after a run. Everything recovers well and I knowingly undersized the hoses, so I'm going to fix the known issue first and see how it reacts. even so, on 100 degree days my IAT's are under 165 on an autocross run and I have a very conservative progressive timing retard (0.5 degree at 125f, 1 degree at 145f, 2 degree at 160f and 4 degree at 170). The cam seals leaked because I reused the intake cam pulleys from a fubar'd engine. Those cam pulleys had some minuscule roughness on the sealing surface that tore apart the cam seals. replaced them with OEM and it stopped immediately. I am setting everything up to be able to run 315's eventually, the wheels and wide body I'm using will be able to accept them but there's a cost consideration and I'm a bit nervous about whats going to break first. so I'm looking at 285 falken 660's. I'm running XSA, I fit the minimum weight pretty well and I like the savings of street tires vs Hoosiers. Thanks for the input everyone! I appreciate it. |
11-04-2020, 12:41 PM | #41 | |
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Member#: 434904
Join Date: Nov 2015
Location: Spokane, WA
Vehicle:2002 Impreza WRX WRB |
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11-04-2020, 03:15 PM | #42 | ||
Scooby Guru
Member#: 80649
Join Date: Jan 2005
Chapter/Region:
South East
Location: Columbia, SC
Vehicle:2000 2.5 Auto-X RSTi Sparkly |
Quote:
But I'll tell you the wear and tear is less component related and more "check your subframes more often for tears" related. Quote:
All that to say, don't spend time on things that don't make you faster. Don't do half steps knowing you'll need to redo them later to take a full step. |
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11-04-2020, 09:00 PM | #43 | |
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Member#: 191967
Join Date: Oct 2008
Location: Vancouver
Vehicle:2005 EVO VIII open source tuning subaru |
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11-05-2020, 09:28 AM | #44 |
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Member#: 434904
Join Date: Nov 2015
Location: Spokane, WA
Vehicle:2002 Impreza WRX WRB |
I don't remember what rpm I crossed the line, but I run 13.5 degrees timing at 7200. The 9 degrees was a product of my IAT based timing retard. I used to run more timing, but I've got air flow restrictions that mean I don't make any power past 7200, so in the future when I upgrade to fix that I'll pay more attention to that section of the tune. I'm not monitoring egts, but only because I ran out of analog inputs. Working on expanding I/O. The car is driven a lot and never gently so I don't mind keeping the tune a little gentle up top and full in the mid range.
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11-05-2020, 08:27 PM | #45 | |
Scooby Specialist
Member#: 191967
Join Date: Oct 2008
Location: Vancouver
Vehicle:2005 EVO VIII open source tuning subaru |
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11-06-2020, 05:03 PM | #46 | |
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Member#: 434904
Join Date: Nov 2015
Location: Spokane, WA
Vehicle:2002 Impreza WRX WRB |
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11-06-2020, 05:57 PM | #47 | |
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Member#: 191967
Join Date: Oct 2008
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Vehicle:2005 EVO VIII open source tuning subaru |
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11-30-2020, 09:37 PM | #48 |
Scooby Guru
Member#: 33782
Join Date: Mar 2003
Chapter/Region:
MAIC
Location: Milton Keynes, UK
Vehicle:96 3MI Racing search FIRST, then PM!!! |
For me it's more of the "if I'm in there, I may as well" type of feature to add. Makes a potential track side repair much faster, and much more doable for those without a press. <-----someone still me, without a press
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12-01-2020, 05:32 PM | #49 |
Scooby Newbie
Member#: 434904
Join Date: Nov 2015
Location: Spokane, WA
Vehicle:2002 Impreza WRX WRB |
Exactly my thinking. I've already decided I want to design my own for the experience and to adapt camaro brembos, so while I'm there I might as well make it more serviceable and arguably stronger. Same amount of work either way.
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12-01-2020, 05:46 PM | #50 |
Scooby Newbie
Member#: 434904
Join Date: Nov 2015
Location: Spokane, WA
Vehicle:2002 Impreza WRX WRB |
Update, I've sourced some used wheels and tires and I will be going to 315 as advised. Thank you all for the input. Found some WedsSport TC105N's in 18x10.5 +12mm wrapped in some very cheap BFG rivals.
https://photos.app.goo.gl/AxDfvsCJYDiGnb8z7 |
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