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Old 05-11-2004, 03:14 PM   #1
zoomfactor
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Default "Required" mods for a competitive ESP WRX?

Now that the WRX has been actively campaigned for a while and with the debate still raging about the STi's future in ESP, what would you consider to be requirements for a regionally competitive ESP car.

Due to the unfavorable rule-set the WRX will likely be significantly outclassed in the horsepower department, but...For the sake of argument assume we are starting with a decent STX car, less motor mounts and brake upgrades.

Flat-bed trailer
Front diff
Larger TMIC of FMIC (assuming plumbing doesn't impact other necessary components)
Walbro fuel pump + Injectors + tune (Ecutek?) - how to control boost spikes?

Since the brakes need to stay, would wide 15's or 16's be better?

I got kind of irrationally irritated reading the STi/ESP threads on the SCCA boards and thought I'd undertake a research project
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Old 05-11-2004, 03:16 PM   #2
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What about the application of Anti-lag? Since it is primarily a function of timing and fuel delivery.

<I'm aware of some of the drawbacks>
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Old 05-11-2004, 03:33 PM   #3
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If you want to compete in ESP and not worry about a re-class, start with A Forester XT.

- Steve
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Old 05-11-2004, 03:40 PM   #4
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Huge wheels and race tires

245 would be ok in some regions, but Id aim to find a way to make 275s work.

some coilovers with stiff springs, camber plates and lots of camber all around.

turboback exauhst

id skip the LSD, not necessary with all this tire. No point in spending every last cent on stuff like this, you aren't trying to win nationals anyway.

with huge tires, stiff suspension and good driving you should be able to do ok regionally
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Old 05-11-2004, 03:40 PM   #5
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Quote:
Originally posted by zzyzx
If you want to compete in ESP and not worry about a re-class, start with A Forester XT.

- Steve
the WRX is in no danger of being reclassed either.

i'd personally do more then the front diff. i'd do them all. after that, attack the fenders so you can run 275s or whatever.

anti-lag isn't legal. modifying boost isn't legal.
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Old 05-11-2004, 03:48 PM   #6
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Quote:
anti-lag isn't legal.
Why not...If you can modify timing/fuel you can approximate elements of antilag. I didn't see the explicit prohibition of its "effect".
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Old 05-11-2004, 03:58 PM   #7
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Buy my wagon then add:

Front Diff
Fender Flares with as wide a tire you can run
Upgraded IC (Don't think you'd be able to run a FM)
IC hoses
No cats
Fuel pump/Injectors
Remove AC
Small tires 15's?
Brakes are adequate
Seats
Clutch
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Old 05-11-2004, 04:02 PM   #8
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Ohg yeah, can you do lateral links?
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Old 05-11-2004, 04:03 PM   #9
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Quote:
Originally posted by KC
Ohg yeah, can you do lateral links?
As long as the bushings are the same type I believe.
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Old 05-11-2004, 04:48 PM   #10
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Ya know I still need to get definitive clarification on the lateral links. The MRT untis would be the way to got - STi lateral links have different bearings.

Hmm, front diff, coilovers, stiff springs, 275s, no cats, camber plates... that sounds all too familiar.

- Steve
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Old 05-11-2004, 07:14 PM   #11
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Not just wider, but shorter wheels and tires would do wonders with the WRX gearing.

Mike
02 WRX Wagon
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Old 05-11-2004, 07:53 PM   #12
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You won't be able to find any decently wide 15-inch rubber, they stop at either 225 or 245/50 (older Celicas ran these.) I would shoot for the 265/45-16s on like a 16x9.

This would make a good DSP choice for the 2.5RS too.

Chris H.
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Old 05-11-2004, 08:29 PM   #13
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Instead of buying a POS wagon, buy my STX WRX and add the 265/45/16s that chris h. is talking about and you will not only smear regional competition, but win on a national level as well

You could add an IC and front diff, but why would you need to when you can win as is

-Tom
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Old 05-11-2004, 09:32 PM   #14
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Quote:
Originally posted by trhoppe
Instead of buying a POS wagon, buy my STX WRX and add the 265/45/16s that chris h. is talking about and you will not only smear regional competition, but win on a national level as well

You could add an IC and front diff, but why would you need to when you can win as is

-Tom
My car has a proven track record.
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Old 05-11-2004, 09:40 PM   #15
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Quote:
Originally posted by KC
My car has a proven track record.
Oh snap.
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Old 05-11-2004, 11:08 PM   #16
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Quote:
Originally posted by KC
Ohg yeah, can you do lateral links?
can't do lateral links in ESP as far as I know.
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Old 05-11-2004, 11:59 PM   #17
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I agree with most of this. A couple points I don't agree with is about the LSD. You NEED a front LSD of some sort. If I can light up 245 Hoosiers on a 98RS w/open diffs....A WRX is gonna do the same. The front LSD transformed the car and actually made better use of the rubber. Spending money on the LSD(s) is arguably more important than bigger wheels/tires.

A stiff suspension is paramount. SP doesn't follow tradional setup trends. It is completely different. I would argue that a good stiff WRX with a front Quaife and 245s would be DIVISIONALLY competitive with a "decent" driver.

Quote:
Originally posted by jmott
Huge wheels and race tires

245 would be ok in some regions, but Id aim to find a way to make 275s work.

some coilovers with stiff springs, camber plates and lots of camber all around.

turboback exauhst

id skip the LSD, not necessary with all this tire. No point in spending every last cent on stuff like this, you aren't trying to win nationals anyway.

with huge tires, stiff suspension and good driving you should be able to do ok regionally
If it were me I'd do this:

F/R Quaife diffs and STi 20Kg center

SA or DA Konis valved for 9-1klb springs.

850lb springs to start(all around).

big sways at each end.

lightest 16x9(or10) wheels with 245-275 tires
(optionally custom15x10's w 265-50-15 old skool tires).

Careful attention to track width and appropriate fender clearancing to make it work.

the best header I could afford and a good lightweight open exhaust.

a fuel/timing controller w/a higher rev limit.

plenty of toluene.

light seats, no power windows, stereo, A/C, cruise or anything else that is within the rules to reduce weight.

finally, I'd try to gasketmatch each port for the intake and exhaust.


I'm confident that I could do reasonably well with something like this....and I'm no schumacher.



Jay Storm
There's a fine line between "hobby" and "mental illness".....

Last edited by Storm; 05-12-2004 at 12:04 AM.
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Old 05-12-2004, 02:51 AM   #18
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Alright Jay, the race is on. Let's see who makes it to an autox with the BIG meats on the car first!

- Steve
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Old 05-12-2004, 09:02 AM   #19
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Jay,
what did you do to fit 245s on a RS? What wheel were you running? On 16 or 17 inch? Suspension, camber? Any issues or limitation?

Thanks.
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Old 05-12-2004, 09:10 AM   #20
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Quote:
Originally posted by zoomfactor
For the sake of argument assume we are starting with a decent STX car, less motor mounts and brake upgrades.
FYI: Street Prepared allows upgraded motor mounts as of January 2004 (as long as they bolt to the same locations and don't have more metal than the stock ones).

Shane -- SM 729
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Old 05-12-2004, 09:15 AM   #21
zoomfactor
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Missed that...
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Old 05-12-2004, 10:05 AM   #22
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zoomfactor - will you be racing locally/regionally or nationally?

I don't think there are any fast ESP guys in the SE except Tommy Pulliam from Atlanta. You should be able to take out everyone with a STX WRX with race rubber. I wouldn't mod it past that because you can go back to STX whenever you want.

-Tom
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Old 05-12-2004, 01:13 PM   #23
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Quote:
Originally posted by trhoppe
zoomfactor - will you be racing locally/regionally or nationally?

I don't think there are any fast ESP guys in the SE except Tommy Pulliam from Atlanta. You should be able to take out everyone with a STX WRX with race rubber. I wouldn't mod it past that because you can go back to STX whenever you want.

-Tom
The caveat there is that Strano has the basic recipe to transform any year F-body into a very competitive ESP machine. Add a driver that is not known, but did a good buildup....and you have a sleeper awating. There is no such recipe for the Imprezas yet.

I didn't list engine/trans mounts because, to me they are like race rubber. A prerequisite of sorts.

Quote:
Alright Jay, the race is on. Let's see who makes it to an autox with the BIG meats on the car first!

- Steve
Been there with 245s on 16x9 wheels, Steve. The difference is....staggering!

Quote:
Jay,
what did you do to fit 245s on a RS? What wheel were you running? On 16 or 17 inch? Suspension, camber? Any issues or limitation?

Thanks.
We bolted them on...... We have low offset 16x9 wheels and used 16x7 Hart cp-035s last season with 245s. Camber and fenders have been massaged. We rub with the new wheels, but didn't with the Harts.
http://server.tekro.com/~autox/gallery/album11/DSC00802

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Old 05-12-2004, 01:25 PM   #24
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Quote:
Originally posted by Storm
We rub with the new wheels, but didn't with the Harts.
http://server.tekro.com/~autox/gallery/album11/DSC00802

Jay Storm
There's a fine line between "hobby" and "mental illness".......
With high spring rates and properly valved struts, the rubbing will go away. You'll only get it on full lock.. and how often are you at full lock on an auto-x? (if you're full lock, then you need to look at your driving)

--kC
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Old 05-12-2004, 01:34 PM   #25
zoomfactor
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I'll probably stick pretty close to home. I'm in it for fun and self improvement.

FWIW - I have been daily driving the car and the whole STX thing appealed to me because I could change the tires at home and run the car as-is. Well two weeks ago someone ran a red-light and hit the car causing minor damage. So I'm thinking that I really don't want to invest a lot of sweat and $$ into something that could get wiped out by an idiot in a second.

The next (il)logical step was to turn the WRX into a track/auto-x only car and ESP seems like a nice compromise. I just wanted to explore the "required" mods and potential $$ to have a reasonably competitive ESP car.

That...and I've never been a big fan of Mustangs
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