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Old 09-07-2006, 02:27 AM   #1
AnorexicSTI
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Member#: 85227
Join Date: Apr 2005
Chapter/Region: VIC
Location: Vancouver, BC, Canada
Vehicle:
2005 STI
Silver

Default COBB crank pulley review

I'll keep this short and sweet. Install was easy. Remove coolant reservoir, belts... and then use 2ft breaker bar and 22mm socket on the crank pulley bolt... get a pipe that is a little longer than 2ft (I've kept one of these around since my Honda days... if u don't have one, u can usually get one for free from any muffler shop... they have them lying around as scrap...) and install over the breaker bar... put some towels above the lower rad hose to bring the breakerbar "assembly" up higher so it is nearly pressing against the driver side subframe... put a towel in the gap between the bar and subframe... the purpose of the towel is so that when u crank it, the bar doesn't WHAP your subframe and put a dent or scratch in it or anything...

Turn ignition for 0.5s and it's off... install COBB pulley, put car into 5th or 6th, crank the e-brake... and torque to 80ftlbs... replace belts, coolant reservoir and you're done.

Gains are about 2%... feels about the same improvement as when I yanked about 60 lbs out of the car (roughly 2% of 3000 lbs). U get slightly easier revving for heel-toe as well... saves 4 lbs from stock... feels like lightening the stock flywheel about 2 lbs (since flywheel is larger in diameter) in terms of the quicker revving... can't wait to do the flywheel.

On the agenda...
Group N tranny mount
Cobb shifter bushings
COBB uppipe
COBB downpipe

Anybody know if there is any negative to removing all the heatshields from the downpipe back? Besides the engine bay heat shield that shields the intercooler from exhaust heat, and all the heat shields for the exhaust manifold, can I remove all of them from the downpipe to the muffler and not have any adverse affects besides a slightly warmer interior? I want to save weight.

I understand that pre-turbo, u want as much heat in the gases as possible to help with spool... but post-turbo, I would think it doesn't matter. Those heat shields post turbo are only on one side anyways, so the amount of heat they keep "in the exhaust" would seem negligible since u have all the cold air virtually blowing past the exhaust and tranfering heat through (mostly) convection.
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Old 09-07-2006, 02:32 AM   #2
Wylde Horses
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Join Date: May 2004
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Location: Port Coquitlam, BC
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2002 WRX
dirty silver

Default

I'd leave the heat shield that is under the gas tank. You could look into getting your downpipe ceramic coated, or if you haven't bought it yet, get one that is (at a fraction of cobb's price).
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Old 09-07-2006, 02:40 AM   #3
AnorexicSTI
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Quote:
Originally Posted by Wylde Horses View Post
I'd leave the heat shield that is under the gas tank. You could look into getting your downpipe ceramic coated, or if you haven't bought it yet, get one that is (at a fraction of cobb's price).
I guess I f$cked up because I already bought the COBB lol... I had the COBB cat back (came on my car) and I like the sound of it... I don't like something so loud that I can't hear the hottie in my car whining in my ear .... so I just figured from a fit and performance point of view (they are prob. designed to work with each other), I would stick with COBB...

However, while we're on the subject... which brands are coated and a fraction of the COBB price?

Will warmer gas be a detriment? I would think that Subaru would design the gas tank to withstand heat from the exhaust in the event crazy mofo's like us nasioc guys remove the heat shield for the sake of saving 1-2 lbs...

Last edited by AnorexicSTI; 09-07-2006 at 09:22 PM.
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Old 09-07-2006, 02:52 AM   #4
Wylde Horses
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Quote:
Originally Posted by 02wrx88 View Post
However, while we're on the subject... which brands are coated and a fraction of the COBB price?

Will warmer gas be a detriment? I would think that Subaru would design the gas tank to withstand heat from the exhaust in the event crazy mofo's like us nasioc guys remove the heat shield for the sake of saving 1-2 lbs...
Most DPs, and all UPs are cheaper then the cobb units. Don't get me wrong, cobb makes some really nice stuff, it's just to me, a pipe is a pipe (to some degree at least, I always researched the parts I bought to make sure fitment was good). There are a number of companies that do ceramic coating, you could even get some heat resistant coating and do it yourself, but it won't be quite as effective and may wear off over time. The only company that I can think of that sells a ceramic-coated DP is crucial racing.

As for the heat shield under the gas tank, I'd be more concerned about the electrical stuff down there, and what would happen if there were a gas leak in the event of a bad accident.
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Old 09-07-2006, 02:55 AM   #5
AnorexicSTI
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Quote:
Originally Posted by Wylde Horses View Post
As for the heat shield under the gas tank, I'd be more concerned about the electrical stuff down there, and what would happen if there were a gas leak in the event of a bad accident.
Once I get down there this weekend, I'll see if I can snap some pics... and come up with a creative solution to protecting whatever electrical is down there... thanks for the heads up.
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Old 09-07-2006, 09:00 PM   #6
andys
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FYI:

"Fit" is the adjective that describes the ability of parts to mate together.

"Fitment" is a noun that means something entirely different.

Last edited by andys; 09-08-2006 at 12:25 AM. Reason: spelling
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Old 09-07-2006, 09:23 PM   #7
AnorexicSTI
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2005 STI
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Quote:
Originally Posted by andys View Post
FYI:

"Fit" is the adjective that describes the ability of parts to make together.

"Fitment" is a noun that means something entirely different.
Fixed... I have a patented "non stop writing style" that can sometimes produce errors such as the one above.
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