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Old 10-09-2006, 12:34 PM   #1
JamesWilson
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Default Project H-Stock Impreza is Aliiiiive!

Hello all! After a semi-disappointing 4th Year-End in STS2 in the ProSolo National Series, time to switch classes. Picked up a 1998 Subaru Impreza L sedan (2.2L AWD) to serve as a family car, discovered it may have some potential in HS as well. MSN Autos lists the car at 2690lbs (vs 2730 for the L coupe and 2800-2825 for the 2.5RS), no sunroof or wing, rear drums.

We ran the car bone-stock with M/S tires in San Diego, finished 3rd against a Mazda 3 and (believe it or not) a Honda Insight, both on V710's.....back 0.06X seconds. Picked up some very used 205/50-15 Falken Azenis from Leslie Cohen's STS Civic, ran in a local region's Street Tire Stock class (indexed Stock class with no race rubber), finished 3rd again, less than 0.04X back from a very well set-up Civic with dedicated Azenis (sticky and in plastic bags). Still running all-stock 160K mile struts/bushings.

Started replacing parts, found the spark plugs to be worn down to the ceramic insulators-- measured at 0.081 gap! New plugs and wires and paper air filter made the car much more responsive. Porterfield R4-S pads and shoes added as well, and Gruppe-S front sway bar end links. Tried to install the Whiteline 22mm FSB, but couldn't remove some bolts. Same deal on the struts, got ahold of a set of new KYB-AGX's but did not install.

Ran again in San Diego this past weekend, this time with the new lightweight race wheels and 225/50-15 Hankook Z211 C-50 tires, a road-race compound, but I figured good for testing and practices as they can take a little heat. First run group in the morning, first lap put me ahead of HS by over 8 seconds. Ended up winning on my first lap, by a margin of nearly 3 seconds on a 65-sec course. I coned away a lap that was 1 second faster than that, and then did some practice runs in the next run group and ran faster still. Ran faster raw times than ES, GS, and would have been top 3 in CS! All while still on stock old suspension!

Got video of the event, http://www.youtube.com/watch?v=gzKy7IisQpc , forgot to set the video quality higher-- YouTube reduces resolution anyway.

I plan on running at most of the ProSolos and Tours in the western US next year as work and family time allows. With the Mazda 3's and Civics sneaking in on the MINIs, I think it's nice to have a little variety in the class. I have been impressed overall so far with the Subaru, I like the torque and drivability, and a ton of rubber fits on the stock size wheel and tires are cheap in the 15" size.

If any guys used to run HS/GS in the Impreza, I would love some input!

Thanks,

JW
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Old 10-09-2006, 01:01 PM   #2
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Congrats James

-Max.
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Old 10-09-2006, 01:18 PM   #3
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Hey James, hope you make it out this sunday to run SK2.

Later Tom. #965
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Old 10-09-2006, 01:19 PM   #4
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Awesome! It would be nice to see a 2.2L Impreza shaking things up in H-Stock!!!
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Old 10-09-2006, 02:50 PM   #5
JamesWilson
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Quote:
Originally Posted by GEARHEAD23 View Post
Hey James, hope you make it out this sunday to run SK2.

Later Tom. #965
Nope, I am "out" of SK2 tires (the old ones I ran last time are now toast). I will also be in Kansas this weekend for the Runoffs. There is a slight chance I will be back before Sunday, but not likely. Next event will be the SCNAX Cup, depends on the tire situation as well.
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Old 10-09-2006, 03:24 PM   #6
GEARHEAD23
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Have fun at the runoffs.
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Old 10-09-2006, 03:31 PM   #7
David Boeren
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Good to see more non-turbo Subarus doing well.

I just started solo and I'm driving a 1998 2.5RS here in Atlanta. I've still got a lot to learn, but I'm slowly improving.
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Old 10-09-2006, 04:30 PM   #8
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James, you will find a ton of good info in this thread.

http://forums.nasioc.com/forums/showthread.php?t=587449

Though, I'm completely revamping my setup for this season.
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Old 10-09-2006, 06:30 PM   #9
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I'm currently prepping a 96 Brighton for FSP. So far, so good.....

The EJ22 is a nice little torque monster!!!


Jay Storm
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Old 10-09-2006, 07:25 PM   #10
JamesWilson
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ratt_finkel, thanks for the thread...basically followed my line of thinking for the past month. Here is what I will initially be running:

K&N drop-in filter
Subaru/OEM tune-up parts (plugs, wires, O2sensors, fuel filter)
Motul 5w-40 Biosynthese diester engine oil, K&N Gold oil filter, UOA.
Motul MotylGear 75w-90 gearbox and diff oil
Future- Remus axle-back or similar exhaust....very far down on the list of To Do's
May need a clutch and OEM engine/trans mounts as well before too deep into the ProSolo season.
Timing belt, rollers/tensioners, seals for sure....at 162K miles with unsure maintenance history.

Whiteline 22mm FSB
KYB AGX struts, OEM upper mounts/bearings.
Subaru/OEM RSB bushings and end links
Alignment

15x6" +50mm 13lb wheels
225/50-15 Hankook Z211 C-50 tires (wet/practice/local)
225/50-15 Hankook Z214 C-70 tires (ProSolo/Tour)

FWIW, I had been running 39-40psi hot Front and 48-50psi hot rear on fairly grippy asphalt in San Diego. Very little push, great transition, and decent in the sweepers....video should show it.


It's so nice to have such a short list! Lots of seat time and testing will be my priority this year, I think in years past we had focused too much on trying to change the car, when often all that was needed is a Driver Tweak. Worked for us in a very "basic" STS Civic setup, good for many Tour trophies and a solid trophy at Nationals in 2004.....driver was more important than $$ and parts.
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Old 10-09-2006, 07:43 PM   #11
10th Warrior
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might want to throw on a half-way decent brake pad as well.

Do you have a deal with Hankook or something? There's a 225/50 15 710.
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Old 10-09-2006, 10:41 PM   #12
JamesWilson
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Quote:
Originally Posted by 10th Warrior View Post
might want to throw on a half-way decent brake pad as well.

Do you have a deal with Hankook or something? There's a 225/50 15 710.
D'oh-- yes, I have installed Porterfield R4-S pads in the front and had them make me a set of R4-S shoes for the rear, and replaced all hardware and hydraulic pieces (calipers, wheel cylinders, hardware, etc.) to eliminate a possible problem area later.

Yes, deal with Hankook Motorsports :-P
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Old 10-10-2006, 09:57 AM   #13
ratt_finkel
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James, the L springs are even softer than my RS springs. And while my upgrade to the 22mm bar was a great benefit. The car's really need as much spring in the front as possible. I would highly recommend upgrading the bar to a 25mm Addco bar made for the legacy.

I have the Part numbers if you're interested. That is one of the changes I'm making in the off-season. Also, for air pressures, I typically run between 32-35 all around on my 225 V710's. Not sure how the hankooks are. But very rarely did I have to run a huge pressure difference in the rear for rotation.

In addition, copius amounts of toe out in the front will do wonders for turn-in. I run at the minimum 1/8, usually 1/4" though. I've yet to tacke the rear-toe, cause like I've mentioned in the past, I've never had a real problem with rotation, trail braking is your friend!

I would actually put an exhaust higher on the list. The entire stock system from the heads back is a giant bottle-neck. You will see appreciable gains with a high-flow system.
And lastly eek out every tenth of negative camber in the front as you can.
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Old 10-10-2006, 11:00 AM   #14
JamesWilson
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True. Maybe I will have an asphalt and a concrete setup. I really wanted the Whiteline blade-adjustable bar. I had a similar design on my Porsche 931, really versatile. Shoot me that Addco part number, and I will do a little research. It's my birthday today, maybe I can con someone to get it for me :-P
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Old 10-10-2006, 11:05 AM   #15
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A very good "feel" mod is the tranny mount. Replace it with a new one or a new car take-off (if that's allowed). Makes the car feel more solid and mathematically you are putting more power to the wheels and this will cut down on mis-shifts.
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Old 10-10-2006, 12:54 PM   #16
10th Warrior
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Quote:
Yes, deal with Hankook Motorsports :-P
Awesome

Like Jeremy mentioned, you'll start playing with toe quite a bit. You can get about 3/4" out in the rear, making it one of the few broad adjustments allowed. Running a 1/4" out in the rear is not uncommon. Obviously alot depends on your driving style and tires.

Pressure wise, I did run alot of pressure and alot of stagger (with usually 5-9 psi more in the rear) with the S03s, E700s, and Avons. I hopped cars before the 710 was available in a usable size but they do seem to run low pressure wise, at least on a SP car.

oh, happy birthday
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Old 10-10-2006, 01:04 PM   #17
ratt_finkel
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I'm having problems finding the pm I had with the part numbers, etc. It is listed on their site though. Under 98-04 Legacy AWD. And Happy Birthday!
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Old 10-22-2006, 03:05 AM   #18
JamesWilson
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Got the Whiteline 22mm FSB, KYB AGX struts, gearbox and engine oils, and brake fluid all changed out today....practice day at California Speedway tomorrow.

Last event I was 10th on the PAX/Index, very difficult in SoCal....using all-stock stuff. I hope to God that I haven't ruined a Good Thing!

-JW
ChaseCam.com
Hankook Motorsports
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Old 10-23-2006, 02:12 AM   #19
JamesWilson
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Man I suck...but still ran about a second faster than the other HS cars there. Good video, but only a few...left my larger CF card at home. Mako got a few shots, I will post them later. Much flatter cornering, but I am not sure the added stiffness is helping the crappy steady-state cornering.

-JW
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Old 10-23-2006, 10:36 AM   #20
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JW,
If the added stiffness isn't helping steady-state and you remain the same there, how is the car through transition? If you gain time in one area without losing time in another, I'd call that a net gain for sure.

-Biggly
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Old 10-23-2006, 12:54 PM   #21
ratt_finkel
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Like he said, the big gains are going to be had in transitonal elements. Also, try taking a tighter line. I know that I had to adjust my driving stlye when I added the FSB. Less Trail-braking, less late-apexing, etc. Course dependent of course.

Also, what type of air pressures are you running? Have you adjusted the alignment yet? Camber is going to be the most important on this car. Toe next.
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Old 10-23-2006, 02:14 PM   #22
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Quote:
Originally Posted by ratt_finkel View Post
Like he said, the big gains are going to be had in transitonal elements. Also, try taking a tighter line. I know that I had to adjust my driving stlye when I added the FSB. Less Trail-braking, less late-apexing, etc. Course dependent of course.

Also, what type of air pressures are you running? Have you adjusted the alignment yet? Camber is going to be the most important on this car. Toe next.
I maxed out the camber with the stock eccentric bolt, did not check toe....car needs to be aligned with a new set of tires, as mine are all not necessarily the same shape :-) True, my line has now changed as well. Car is still fast nonetheless, just need more seat time and testing. Tire pressures started at 35F and 37R, then heated up to 39-40psi F and 40psi rear, bled down to 35-37psi rear and 36psi front, all with no change in lap time (like 10 laps within 0.05X sec). Final lap I did set the front struts to #2 and it felt better all over, but was 0.3 slower....wish I could have done more adjustments, but the practice layout did not allow for changes.

http://www.youtube.com/watch?v=fQkMRzvP--k
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Old 10-23-2006, 02:31 PM   #23
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JW,
Have you tried making the rear loose somehow? (i.e. high pressure, toe-out, etc)?

"Loose is fast"

-Biggly
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Old 10-23-2006, 02:36 PM   #24
ratt_finkel
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Well defintely work on getting that alignment. To give you any indicator. I run %99.9 run 32psi all the way around. Occasionally I'll run 35 in the front. Though, I've found in my RS, the steering input will be somewhat slower with lower air pressures. You can defintely tell a loss of grip going above 32. So I usually run more toe-out in the front to gain the steering response back.

This is on 225/50/16 V710's, FYI.

I'm still amazed at the courses you guys have there. Minus the slalom, it looks like more of a road course than auto-x, lol.

The car looked good on course though.
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Old 10-23-2006, 03:55 PM   #25
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Quote:
Originally Posted by JamesWilson View Post
Shoot me that Addco part number, and I will do a little research. It's my birthday today, maybe I can con someone to get it for me :-P
Check out this thread:25mm sway bar... TOO BIG?
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