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Old 08-15-2006, 05:08 PM   #1
AnorexicSTI
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Default Project 05 STI - modification recommendations

Ok, I want to start modifying my 05 STI a little more seriously now.

So far, just got a COBB cat back that came with the car. I've done a lot of weight reduction (probably around 150 lbs) but now it's time to get a little more serious. What do you think I should do next?

I was considering:
1. Downpipe and midpipe with no cat from COBB. I like the relative quietness of the COBB catback so I thought I would go with the same brand... however, feedback on other brands is appreciated. I want a nice throaty sound without sounding obnoxious and would like about the same sound levels as stock while cruising (which the COBB seems to do so far).

2. CF driveshaft at the same time as the downpipe/midpipe since it needs to be removed to install the driveshaft anyways.

3. Lightened pulley or underdrive pulley. I seem to be reading a lot of negative things about underdrive pulleys and a lot of people seem to be selling them... so I'm thinking I should just go lightened. Brand recommendations?
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Old 08-15-2006, 09:00 PM   #2
dwaynesti
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probably some sort of tuning would be best
access port, ecutek
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Old 08-15-2006, 09:11 PM   #3
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I wouldn't rush to do the drive shaft. a downpipe is a very easy job so paying to do the drive shaft down the road, you're not saving a tonne of money. Definitely do the tuning along with the DP or even before. The STi reacts VERY well to good tuning. For similar DP check www.rocketrally.com
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Old 08-15-2006, 09:11 PM   #4
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big no-no for underdriven pulley... and before putting everythin in, get a EM first... good luck!
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Old 08-15-2006, 10:02 PM   #5
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+4 for EM first and to go even further, get an AP.
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Old 08-15-2006, 10:22 PM   #6
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Quote:
Originally Posted by Dalton
+4 for EM first and to go even further, get an AP.
Would it be necessary to get guages before EM--or is it just "recommended" or not needed at all?
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Old 08-15-2006, 10:34 PM   #7
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I'm still researching this as well for the STi, from what I gather, for a Stage 1 set up one probably don't need much by way of guages;. but a boost guage would be nice. For Stage 2 then you'd want to get a boost guage, and EGT, and a Omidometer. You wouldn't want to over 43ma and cause $250 damage.
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Old 08-15-2006, 11:44 PM   #8
veightkiller
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dude,forget about the CF driveshaft get a bigger turbo instead.
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Old 08-16-2006, 01:01 AM   #9
Dalton
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Subtle modifications are kind of nice though. Ones that won't cause any issues anyway.

I mean I know that you can upgrade lots and lots of things but sometimes little gremlins can pop up and some people don't want to deal with those kinds of things. Easy way for more power, more get up 'n go, lighten up the car and any kind of rotating mass. Couple that with some mild modifications and you've something very drivable, faster than stock, but not insane and unreliable or noisy.
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Old 08-16-2006, 01:22 AM   #10
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TBE + tune is a great way to add significant HP and even better TQ! I did that initially then went to a 20g. I ended up going back because one of the things I loved about the STi was the instant spool and low end grunt. Bigger turbos generally come with increased lag so that's something to consider based on how important that is to you.

Gauges are a very smart idea anytime you're modding. I recommend EGT, boost and oil pressure. The driveshaft could open up a can of worms you man not want.

Best thing to do is to map out your goals and mod based on them. BTW, are you considering suspension or brakes?
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Old 08-16-2006, 04:45 AM   #11
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Old 08-16-2006, 03:56 PM   #12
AnorexicSTI
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Quote:
Originally Posted by ChrisF
TBE + tune is a great way to add significant HP and even better TQ! I did that initially then went to a 20g. I ended up going back because one of the things I loved about the STi was the instant spool and low end grunt. Bigger turbos generally come with increased lag so that's something to consider based on how important that is to you.

Gauges are a very smart idea anytime you're modding. I recommend EGT, boost and oil pressure. The driveshaft could open up a can of worms you man not want.

Best thing to do is to map out your goals and mod based on them. BTW, are you considering suspension or brakes?
Thanks for the reply.

I've read good things about the ACPT CF driveshaft. What can of worms might I be opening by getting one?

I haven't really researched suspension yet, but I would like to get lightweight coilovers and double adjustable dampers (both in rebound and compression). How much have you guys been lowering your cars?

For brakes, I want to get Ti or Al rotor hats to save weight, slotted rottors, and upgraded pads, lines (SS goodridge, and fluid (Motul 600).

Recommendations welcome.
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Old 08-16-2006, 04:20 PM   #13
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Not sure about the ACPT, but have heard about balance and separation issues with one of the CF driveshafts. I love the idea, but would want further long term testing. It's the last thing you want to give out at 6000RPM's in 4th gear.

Suspension wise, there are great simple mods that will make the car handle a lot better. Coils unless setup properly can make the car handle like crap. Make sure if you go that route, you find someone who understands suspension tuning. I personally loved just JDM pinks, Group N mounts and sway bars. Car handled fantastic and was very livable.

Brake wise, all I found necessary was pads, lines, fluid for general track abuse. Loved the Ferodo D2500's and still use them on my EVO.
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Old 08-16-2006, 04:20 PM   #14
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Quote:
Originally Posted by 02wrx88
I haven't really researched suspension yet, but I would like to get lightweight coilovers and double adjustable dampers (both in rebound and compression). How much have you guys been lowering your cars?
I've been reading a lot of good things about RCE springs which are designed specifically for the STI:

http://forums.nasioc.com/forums/show....php?t=1024146

Unofficial RCE spring review

I'm thinking that this is what I would like to go with.
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Old 08-16-2006, 04:22 PM   #15
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OOh definitely....Myles and RCE have probably done as much testing on the STi as anyone. I would highly recommend him for any of your modding and especially suspension.
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Old 09-07-2006, 03:47 AM   #16
AnorexicSTI
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Default Sept 7th update

Installed COBB crank pulley. Read review here:

http://forums.nasioc.com/forums/show...0#post15157630

To sum up, it provided about a 2% gain... well worth it.

Next up:
COBB shifter bushings - I figure all the brands have them made by the same company except in a diff. color?

Group N tranny mount (should I have gone even harder, or is the hard rubber used in this mount sufficient?) - the problem I have is that in 1st gear making a turn and then "gunning it," (100% throttle) the tranny and engine sway too much and often cause me to miss the 1-2 speed-shift whch isn't a problem in a straight line or at 75% throttle while doing the turn...

COBB up-pipe - hopefully this is compatible with other headers out there.

COBB downpipe - I was told I should port the wastegaste while I've got this out... any pointers or links?

Tune at Rocket Rally.

Thanks!

Last edited by AnorexicSTI; 09-07-2006 at 08:11 PM.
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Old 09-07-2006, 06:51 AM   #17
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STI's come with catless UP so it's not necessary to upgrade it

I say save ur money for other mods
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Old 09-07-2006, 07:50 AM   #18
semaj
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RiceBuster ^^ Is your FXT Lowered on Rota's with a Yakima carrier on top???
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Old 09-07-2006, 03:43 PM   #19
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^^ no i just bought my car and its pure stock right now

but it will be like that in couple month but minus the yakima carrier
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Old 09-07-2006, 07:34 PM   #20
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Quote:
Originally Posted by RiceBuster View Post
^^ no i just bought my car and its pure stock right now

but it will be like that in couple month but minus the yakima carrier
Ah ok...I saw one downtown, and I thought maybe it was someone on here But no one knows whose it is.
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Old 09-07-2006, 09:11 PM   #21
A-Dev
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lightened pulley, lightened flywheel, and some lighter wheels.. take a lil more weight out of the car if possible. then tune it PROPERLY and you'll be sitting pretty.
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Old 09-07-2006, 11:32 PM   #22
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Go see Jamie at rocketrally and he'll take care of you. Or save your money for a gun. Other car won't be able to outrun a bullet no matter how fast it is off the line.
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Old 09-07-2006, 11:40 PM   #23
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Quote:
Originally Posted by A-Dev View Post
lightened pulley, lightened flywheel, and some lighter wheels.. take a lil more weight out of the car if possible. then tune it PROPERLY and you'll be sitting pretty.
Your money is WAY better spent doing power mods than trying to get a few pounds out of the car with a pulley and flywheel or even lightweight wheels. For $2K+ you can get a 20-25% increase in power. Hit it up ROB!
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Old 09-08-2006, 01:02 AM   #24
AnorexicSTI
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Quote:
Originally Posted by tora View Post
Your money is WAY better spent doing power mods than trying to get a few pounds out of the car with a pulley and flywheel or even lightweight wheels. For $2K+ you can get a 20-25% increase in power. Hit it up ROB!

I'll be visiting rocket rally for the tune after the dp install. What else do u recommend power wise for 2k?

Flywheel will go in once the clutch dies. I want 2 sets of wheels/tires anyways... stock for track, something else for street. Anybody got a set of 17x8 BBS takeoffs for sale? I need an extra set to mount my nokian snow tires for later... sick of paying $80 to switch them all the time.

Last edited by AnorexicSTI; 09-08-2006 at 01:14 AM.
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Old 09-08-2006, 01:31 AM   #25
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get the CF driveshaft. Those things ROCK! Soooo much more torque and real tough when you smack them on rocks. Easy to repair too. I can't think of a better way to spend money.
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