Cobb or Vishnu

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Feb 11, 2004 | 05:01 PM

#16

DOHCammin

Registered User

Joined: Feb 2003

Posts: 307

From: Burbank, California

Car Info: 05 CGM FXT STi

thanks for the info shiv. I was hoping for over 200whp with the flash and those numbers sound very impressive.

Feb 13, 2004 | 05:40 PM

#17

WRXncrew

Registered User

iTrader: (6)

Joined: Aug 2003

Posts: 692

From: San Jose, CA

Car Info: http://goo.gl/XpkO0b & '99 SF 'S'

Quote:

Originally posted by Vishnu
Hi there,

[snip]... As for porting and polishing the factory turbo, it shouldn't make much of a difference if done well. If done improperly (which is more common from what I've seen), performance will be compromised for good. It is my opinion that you leave the factory turbo untouched

Could you please explain more about what you've seen regarding the P&P? There are people who get their turbos reworked, so that they can eliminate boost creep. Are you saying this was not done correctly, or that it doesn't make any difference, or that it made things worse?

Feb 14, 2004 | 06:36 PM

#18

Vishnu

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iTrader: (3)

Joined: Nov 2002

Posts: 439

From: Blackhawk, CA

Car Info: 996 Turbo,Gallardo,BMW 335,125cc shifter kart,etc

Quote:

Originally posted by WRXncrew
Could you please explain more about what you've seen regarding the P&P? There are people who get their turbos reworked, so that they can eliminate boost creep. Are you saying this was not done correctly, or that it doesn't make any difference, or that it made things worse?

All of the above. About the only thing I would ever consider doing to a turbo is extrude honing the exhaust housing. Nothing else. No porting, polishing, etc,. No mods to the compressor side. Most of the turbos that I've tested with ported wastegate housings usually leak (don't seal properly). This is caused by human error which, unfortunately, is pretty common.

Just my experience though...

Shiv
________
Circle l engine

Last edited by Vishnu; Mar 7, 2011 at 04:21 AM.