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Old 04-23-2003, 09:33 PM   #1
Wombat North
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Default Who else is Modding STI

It seems most on this forum are leaving the STI stock. While that might be fine for some it might not be enough for others

FWIW
I'm modding as soon as I get my car in 7 weeks. Only waiting for the motor to loosen up(about 4k)

The reason I sold Stage 4 and now WRX Its close to maxing the drivetrain and motor. I had alot of fun at track days but now I want a Z06 beater at the track(not Drag).
http://forums.nasioc.com/forums/show...9981&highlight
The AMG Kompressor was a SLK32

I'm first on the list at Turboxs for the STI Garrett and UTEC setup. Nathan thinks I'm crazier than most but 450WHP is being thrown around. BTW Nathan believes the AVCS, TBW and the UJ injectors shouldn't pose a problem when making UTEC.

Comparing EVO/STI the 2.5 has it for me. Won't have to use toluene so much.

BTW I Don't care about warranty

A couple of things for you guys modding the STI, it is confirmed the Shimless valves are in. This should allow a few higher revs

Injectors are UJ 534cc which are smaller than older STI so it will be interesting how much HP they will support before upsizing.

Whiteline in Australia is already working on Suspension parts having called them and Matt Weiss at Stoptech is looking into brake pads.

Track day in July.

YA GOTTA LUV THIS CAR
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Old 04-23-2003, 10:01 PM   #2
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Ill be modding it, just an exhaust at first then I will wait to see the results others have with mods then mod my car as well.
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Old 04-23-2003, 10:12 PM   #3
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I'm sure eventually I will mod it. But as it sits now I'll probably be happy enough with it at first. I think I will buy a set of wheels and tires (Pirelli maybe) that are more street friendly and save the stockers for track days. First my money will be going towards a helmet and some driving shoes and a few choice custom decals.
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Old 04-23-2003, 10:20 PM   #4
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Will start modding right away. In the end I will be shooting for 400+ whp. Told the dealership even before I put the deposti down at I will be doing this and had a talk to the service manager about whether or not his is going to not warrenty parts that are not effected be the modds. He said he would so fingers are crossed.
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Old 04-23-2003, 10:58 PM   #5
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shoracer
That's great to here about your dealer. Mine is also very reasonable about these things.

BTW
I have been invited to dealer STI training day in early may. What do you guys want to know about specs as I have a few USDM PDF's already like the Green brackets of death are not on the STI.

Fuel pump size?
Confirmation of Turbo Type etc

Let me know
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Old 04-24-2003, 10:09 AM   #6
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given that I will be trading up from a Saturn SL2 the biggest mod in my life will we the STi itself.

BTW, What are the green brackets of death? This is the first I have heard of these.
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Old 04-24-2003, 11:42 AM   #7
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I will be doing on a few mods Looking for 350-360hp or so at the motor, I think this will do it easily. Easily a mid 12's quater, and one heck of a track car.

K&N Drop in air filter
Turbo Back Exhaust
HKS SSBOV
UTEC w/ boost control
Silicon hoses
maybe a front mount intercooler (I will only do this if I feel it is really really needed.) ;plus they look ;pretty cool.

I will add some guages as well. Gotta have boost, oil pressure, EGT, oil temp guages at least. I probally import some real STi guages though. Anybody interested in doing a group buy on some guages.

Any upgrades I can do, I am going to try to use STI parts.

I am going to wait to see about suspsion. Maybe rear swaybar and strut bar.

BTW... You know I have to have sterio too. But I am probably leaving it at that. (at least I hope I will)

For what it is worth I am keeping all my stock stuff.
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Old 04-24-2003, 01:52 PM   #8
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I will definately be modding but am going to take things alot slower with the Sti than I have with modding cars in the past. I want each mod to be done in good taste and be of top notch quality. I think going that route I will appreciate each mod more and be able to make the best possible choice for each particular performance/appearance enhancing modifications
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Old 04-24-2003, 02:20 PM   #9
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First to go would be the stupid seats.
Cant believe Subaru put such crap seats(although with nice material) on such a performance car.

Then if there is a FMIC with a nice hood around, I'll use that to replace the bigass hoodscoop.

Maybe the WRC big front quarter panel would look good too.
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Old 04-24-2003, 02:32 PM   #10
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First i'll be sticking in my broadway mirror...... i can't believe they still don't put wider mirrors in cars, how can you people see out of those dinky stock units?

Next would definately some stickier rubber, and suspension down the line, since i came from a wrx with a bit of a torque difference, i wanna get used to the car before i put more power into it, you know, don't want the car to be fiercer than the driver
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Old 04-24-2003, 03:10 PM   #11
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Quote:
Originally posted by RA29
First to go would be the stupid seats.
Cant believe Subaru put such crap seats(although with nice material) on such a performance car.

Then if there is a FMIC with a nice hood around, I'll use that to replace the bigass hoodscoop.

Maybe the WRC big front quarter panel would look good too.
I am assuming that the seats are not the blue and black ones. If so then you might as well get recaros or something because those puppys are in the JDM version too. They have a solid black set from the S202 on Yahoo Japan for 190000 Yen. I like the seats but thats just my .02
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Old 04-24-2003, 03:22 PM   #12
RA29
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Thinking of Recaro SRD seats
They are very supportive and comes in black or blue.
I sat in both the '04 wrx seats and the Recaro SRD seats back to back and the Recaros are so much better.
A full set isnt that expensive too and cheaper than the JDM STi seats.
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Old 04-24-2003, 03:26 PM   #13
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Quote:
Originally posted by T-WRX Racer
I will be doing on a few mods Looking for 350-360hp or so at the motor, I think this will do it easily. Easily a mid 12's quater, and one heck of a track car.

K&N Drop in air filter
Turbo Back Exhaust
HKS SSBOV
UTEC w/ boost control
Silicon hoses
maybe a front mount intercooler (I will only do this if I feel it is really really needed.) ;plus they look ;pretty cool.

I will add some guages as well. Gotta have boost, oil pressure, EGT, oil temp guages at least. I probally import some real STi guages though. Anybody interested in doing a group buy on some guages.

Any upgrades I can do, I am going to try to use STI parts.

I am going to wait to see about suspsion. Maybe rear swaybar and strut bar.

BTW... You know I have to have sterio too. But I am probably leaving it at that. (at least I hope I will)

For what it is worth I am keeping all my stock stuff.
UTEC? has TXS already figured out the STI's ECU? Throttle by wire. This is a question I ask about once a week. For those want more HP or adding a different turbo and/or FMIC or perhaps bigger TMIC.. what ECU or piggyback will you use and how will it control the throttle?
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Old 04-24-2003, 03:59 PM   #14
T-WRX Racer
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Don't get discouraged, I am sure Utec or another company will come out with a piggy back or stand alone unit for the sti. I just said UTEC because they will probably have one. But If not I believe the Greddy emanage would work.
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Old 04-24-2003, 05:48 PM   #15
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Quote:
Originally posted by DuoMaxwell


I am assuming that the seats are not the blue and black ones. If so then you might as well get recaros or something because those puppys are in the JDM version too. They have a solid black set from the S202 on Yahoo Japan for 190000 Yen. I like the seats but thats just my .02
Look closely at the JDM seats....they are much more supportive in the bolster and hip/thigh region. The USDM STi seats are made for us "fat" americans. Anybody who has a set of JDM STi seats can attest to how supportive they are
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Old 04-24-2003, 06:15 PM   #16
RA29
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Yea, the JDM seats are a lot more supportive than the US seats.
The JDM seats would be nice too but for the same price, I would get the Recaro seats as the recaro seats are built better (not as flimsy as the JDM STi seats).
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Old 04-24-2003, 06:23 PM   #17
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i really don't recommand the RECARO SRD'S if you plan on using your car as a daily driver. i had these in my car for 2 weeks and i swear to God they were a pain in the a#$ to use daily. they are too stiff and they are not comfy at all for more than 20 min rides. i replaced them with JDM wrx seats and they are much better seats overall for daily drives. i already bought STI v7 seats to put in my STI due to the fact that they are the best overall seats. supportive, comfy, match the interior.
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Old 04-24-2003, 09:45 PM   #18
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I'm going to mod mine as soon as I get the thing as well. I've called a couple places and everyone is telling me that 250whp is enough and that I don't need to mod it. More power is better!!!!

I want as many whps as I can get. I was looking at the garret gt3037 turbo, as well as a FMIC and everything else that comes with this project. This is the first time that I am hooking up a Suby so I need help, if anyone can give me some good mod tips, I'd appreciate it a lot. Money is not going to be a problem...as of yet, I plan to make this thing into a magazine cover worthy dream Sti. The first thing I want to change is the performance. I can care less about looks, all I want is power for now.

My goal is to get over 450whp without race gas and blowing my engine.

Please email me if you have any suggestions to ananamus007@yahoo.com
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Old 04-25-2003, 09:24 AM   #19
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I would bet that the STi, stock, is already a Vette-killer at the track. You'd be on the throttle so much earlier than the Vette driver coming out of corners, and thanks to those big Brembos, late braking should be easily attainable. It's hard to argue with V8 thrust on the straights, but the STi should have enough power, given its weight and traction, to hold its own.

Ultimately, the real answer is "hey, it's your car." But if I were getting an STi, I wouldn't touch it. Even with plenty of Skip Barber training, I'm not a good enough driver to extract all of the performance potential from my WRX, never mind an STi, which should be a crazy fast car.

Wallbanger, Sam Rigoli seems to be the guy who gets the most from WRXes. His car is unreal, though I don't know how streetable they are.

Kevin
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Old 04-25-2003, 11:02 AM   #20
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I plan to do light modding to mine. Maybe relocate the battery (and switch to a lighter weight batter) in the rear for better weight distribution. Drop the spare tire, jack, and possibly air conditioning to save a hundred pounds. Switch to some better interccoler hoses (if the stockers are inadequate) to make the turbo's job easier. Maybe a new exhaust to drop another 30 pounds and flatten out the already sure to be impressive torque curve.

I want to keep the car legal for SCCA track days though, I don't want to be racing against modded Porsches or such because I droped a cat after the turbo

I'm not a large person (5'6" and 170 pounds); my WRX seats are bigger than I'd like. I imagine changing the seats will be a priority. The new seats will have to have provisions for the side air bags and be approved with my insurance company before installing them. I'd hate to be in an accident and have a claim denied for aftermarket seats.

And of course I'll get all the standard stuff; gauges (from my old WRX), SS brake lines, kartboy shifter bushings, better brake fluid, etc...
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Old 04-25-2003, 03:39 PM   #21
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I see everyone is all excited about modding the STI..but would existing ECUs such as UTEC work well with drive by wire? DBW is a pain in the A$$ to tune for
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Old 04-25-2003, 04:58 PM   #22
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Ok, someone answer me this:

What wouldn't you mod?

How much power would the Sti have to come with for you to say 'Well that should be enough for me.' or 'Now I just need to learn to drive to really use this power'


Not flaming.. Just really curious..
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Old 04-25-2003, 05:22 PM   #23
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Quote:
Originally posted by nt5k
Ok, someone answer me this:

What wouldn't you mod?

How much power would the Sti have to come with for you to say 'Well that should be enough for me.' or 'Now I just need to learn to drive to really use this power'


Not flaming.. Just really curious..
Personally, I am modding for more than just power. For example, if I get a new catback exhaust; I've just dropped EGTs a fair bit, and dropped 20+ pounds from my car. Overall, that's a good thing IMO. Remember too, a new exhaust will flatten the torque curve a little, which is always a good thing.

If I replace the stock intercooler hoses with better aftermarket ones then the turbo has to do less work to make the same power, or it can make more boost under maximum load.

Of course both of these mods means I have more top end power if I choose to use it, but it also makes the car more driveable.

I do not want to upset the balance of the STi. If I could get ~320-330HP with bolt-ons, and drop 200-300 pounds by swapping in a lighter battery, removing the spare tire and jack, pulling the AC, etc: Then I'll be thrilled.

Imagine how much better the Brembos, 300 HP/300 torque, suspension, and everything else would work if the STi was under 3000 pounds
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Old 04-25-2003, 05:40 PM   #24
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how much is too much???????????


Well, I imagin to a drag racer, ther is never enough.
But for me 350-360 flywheel hp is enough.

I just want to unlock a little hidden hp. On AWD it gets pretty expensive to shoot for the moon on HP. More drivetrain parts to break and a lot of blown clutches. (Although I know the STi will handle a pretty good bit of HP)

If someone else wants to build a 1000hp STI, Boy I sure would like to see what it can do. (Of coarse it probably can only do it in a straight line.)
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Old 04-25-2003, 06:23 PM   #25
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Quote:
Originally posted by nt5k
Ok, someone answer me this:

What wouldn't you mod?

How much power would the Sti have to come with for you to say 'Well that should be enough for me.' or 'Now I just need to learn to drive to really use this power'


Not flaming.. Just really curious..
Powerwise, "enough" for me is the point where the car just starts to have behaviors that I don't care for and/or a few steps before reliabitity becomes very threatened. In other words, if it came with 600 hp and was Cali legal, quiet, super comfortable, completely worry free, I would want to mod it further. However, in all likely hood, a car like that straight from the factory would be $130,000 at least. 300/300 won't hold my interest very long. My WRX had more than that, and it still wasn't enough. I do plan to be patient with this one though.
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