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Old 01-08-2010, 06:00 AM   #101
scobaru
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I hope to see you at more events in milwaukee this upcoming year.

in terms of practice, my friend alex built a race seat and steering wheel and has the game Live for speed which has an autocross set up that you can build courses and autocross on.

which has helped him a lot in the off season
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Old 01-08-2010, 07:38 AM   #102
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Thinking of adding any diagonal bracing from the strut towers to the forward area of the frame rails? She might become a little more of a flexible flyer without that material.

Thinking out loud.....

Jay
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Got bored.

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Old 01-10-2010, 10:28 PM   #103
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Is cutting that part legal for XP? I thought you couldn't hack the unibody...

-Tim
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Old 01-11-2010, 12:12 AM   #104
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I believe it's the floorpan and firewall cutting that is verboten.....

Jay
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Old 01-11-2010, 02:26 AM   #105
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Quote:
Originally Posted by Kotir View Post
Is cutting that part legal for XP? I thought you couldn't hack the unibody...

-Tim
Hi Kooter

Chris H.
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Old 01-12-2010, 02:03 AM   #106
speedyHAM
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Quote:
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Is cutting that part legal for XP? I thought you couldn't hack the unibody...

-Tim
What was cut out is inner fender, which is specifically allowed.
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Old 01-26-2010, 09:44 PM   #107
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Subscribed!

Nice build!
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Old 01-29-2010, 01:55 AM   #108
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i am in the process of building the same car, i was going to go more towards STX or SM setup, but after watching some of the videos, looks like yours is silly fast being so lite-weight! I hope to be autox-ing mine by this summer!

nice job on the car!
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Old 03-10-2010, 07:25 PM   #109
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Great job. Subscribed!!
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Old 03-13-2010, 02:34 AM   #110
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Thanks for the complements everyone.

A few updates-

As usual, I had reasonable plans for the winter this year for a few small upgrades here and there and after a few weekends of working on things the plans have ballooned to a much larger scope.

I've been continuing to cut weigh out of the car. It's amazing how much stuff there is that can be removed when you REALLY start searching and when saving an ounce with 20 minutes of work is an acceptable trade off. I hope to have the car under 2000 lbs by Nationals.

When changing out the springs I noticed one of my koni's was blown (absolutely zero rebound damping) so I sent them in for a rebuild and re-valve. So those are refreshed and I'm going to start out running 650F 500R springs with a 25mm from bar and no rear bar.

The rear suspension links were changed out for pillowball links (there are now only 6 bushings in the suspension total, with more to be removed next year).

The stock '96 L radiator had a tiny leak starting to show up so I changed it out for a Mishimoto and a Flex-a-lite fan. This should also help the slight overheating problems I was having last year.

To further aid in cooling and improve airflow through the engine bay I'm switching to a air-water intercooler with an icebox in the passenger compartment. Along with that I'll be removing or replacing the hood scoop to provide a vent for the engine compartment. A side benefit will be much colder air to the engine and a much smaller DP across the intercooler.

The gearing was a little short so I'm changing the final drive (again) and changing back to a 50/50 viscous center diff. The Cusco 35/65 center is cool, and fun at higher speeds, but for an autoX car it just doesn't work. For a road course car I imagine it would be perfect.

There are a bunch of other little things going on as well. Hopefully they add up to a competitive car.

(Now I just need to find a competitive driver to drive it well)
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Old 03-14-2010, 03:02 AM   #111
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The old stock WRX intercooler just wasn't cutting it anymore, so it was time for something better. With this setup I can add ice to cool the intake air below ambient. Colder intake air and less pressure drop across the intercooler = MORE POWER!

Should be nice not having to spray down the intercooler after each run.
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Old 03-14-2010, 04:25 AM   #112
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Im working on a awic right now with a ej20g core and exchanger. did you get that pump from frozenboost? thats the one i was thinking of using, or getting one off of a car with an aux. water pump.
for ice, you could freeze some large chunks of ice that fit in your reservoir nicely, and wouldnt melt down to nothing quite as fast or chips potentially clog the system or go through the pump.
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Old 03-14-2010, 12:49 PM   #113
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I did get the intercooler from frozen boost. I am fairly impressed with how well it's made.

As for ice, I put a strainer in the tank with tons of very small holes in it. With how small the holes are the ice chips won't be large enough to damage anything. You also want smaller chunks of ice as they will cool the water more effectively while the intercooler is heating it up. To make sure I have enough I'll just pick up a bag of ice before each event.
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Old 03-14-2010, 06:34 PM   #114
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You wouldn't happen to know how much the cooler and piping weighs? I am considering a similar setup but only if it saves me some weight. Otherwise it wouldn't be benificial for me.

jake
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Old 03-15-2010, 12:36 AM   #115
speedyHAM
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Quote:
Originally Posted by KONKILR View Post
You wouldn't happen to know how much the cooler and piping weighs? I am considering a similar setup but only if it saves me some weight. Otherwise it wouldn't be benificial for me.

jake
Everything added together including the water weighs about 15 lbs more than the stock WRX intercooler. Keep in mind there's about 1-1/2 gallons of water in the car that didn't used to be there. Just the water weighs about 10 lbs.

At least it's weight behind the front axles.

Given the trade offs involved I think the extra weight it worth it in this case. It will allow me to make more power and it solves a few other problems with the car.
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Old 03-15-2010, 02:29 AM   #116
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so this is the water to air setup you spoke of

so did you weigh the pro's and con's of simply keeping the TMIC and running water injection?
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Old 03-18-2010, 12:17 AM   #117
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Quote:
Originally Posted by Homemade WRX View Post
so this is the water to air setup you spoke of

so did you weigh the pro's and con's of simply keeping the TMIC and running water injection?
I thought about running water injection and still have not dropped the idea. The problem with that was the pressure drop across the stock intercooler is huge, robbing power and turbo efficiency. The AWIC setup also helps out in a few other areas that I was having problems with.

I will probably still run water injection at a future date to try to reach my power goals while on the smallest turbo possible to keep lag down.
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Old 03-18-2010, 01:58 AM   #118
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sounds good. What is your displacement limt per weight?...does XP have that too?...now that I'm thinking of it

I heart you Sean
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Old 03-21-2010, 02:50 AM   #119
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i think you guys may give sean a little too much credit here... he's more like a special ed kid that someone gave a sawzall too

So, am i gonna get another chance at the wheel this year sean?
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Old 03-21-2010, 03:51 AM   #120
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Only if you are nice to me.

And I prefer the cut off wheel on an angle grinder, much better accuracy.
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Old 03-21-2010, 04:10 AM   #121
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Quote:
Originally Posted by Homemade WRX View Post
sounds good. What is your displacement limt per weight?...does XP have that too?...now that I'm thinking of it

I heart you Sean
The weight limit for XP for an AWD Forced Induction car is:

1200 + 250 *displacement *1.4

So for a 2.0L Turbo Impreza it comes out to 1900 lbs. For a 2.5L it's 2075 lbs. With a fuel cell and 6 point roll bar a 2.5L car should be able to add ballast to improve the weight distribution and get up to 2075 lbs. That's my (long term) plan anyway.
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Old 03-21-2010, 04:18 PM   #122
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I have an AWIC setup for my car and am contemplating going back to a TMIC setup.

I had a about a 2 gallon reservoir and as much as I tried to shield the IC, with it sitting above the engine it just wasn't working all that well. That is also with a fairly large heat exchanger in the front of the car, although the heat exchanger has no fans. I was contemplating adding some fans to it so I could cool the water while the car was sitting. I was worried about events like ProSolos where the car would be doing back to back runs and sitting idle for perhaps extended amounts of time.

Maybe I should finish the car so I can actually test out the theory.

I do like your piping, my core is too large to do the piping like that...
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Old 03-21-2010, 06:03 PM   #123
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Sean, there are some better, IMHO, engine setups than a 2.5L. They're smaller and thus lighter too
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Old 03-29-2010, 11:59 PM   #124
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Doors lost a little more weight.



Now this is cross drilling!



New strut tower bar installed, the old one didn't fit with the new IC, so I made one that's almost as light (1/2 lb heavier) and much stiffer. Should help offset some of the cutting that happened.



I just get a kick out of this every time I read "inability to determine the use". :LOL
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Old 03-30-2010, 12:26 AM   #125
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Very nice build so far. I especially like the craftsmanship you put into the engine setup.
I'll be checking this thread often for more autox videos.
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