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Old 10-12-2020, 07:51 AM   #1
WRXXXED
Scooby Specialist
 
Member#: 432652
Join Date: Oct 2015
Location: Gap, PA
Vehicle:
2010 Subaru WRX STI
61K (Gray)

Default Do i need a retune?

Okay, so if youve been following a couple of my recent threads here you probably know that ive built a new shortblock and did hgs on my 2010 sti. This also may be a VERY STUPID thing to not do with a simple answer of yes but, do i need a retune?

The only things that have changed is going from a MLS headgasket to the IAG copper ring one (little wider) and 100mm pistons over the stock 99.5mm. Same turbo, same exhaust manifold etc.
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Old 10-12-2020, 07:55 AM   #2
subydude
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Member#: 80649
Join Date: Jan 2005
Chapter/Region: South East
Location: Columbia, SC
Vehicle:
2000 2.5 Auto-X RSTi
Dusty

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If compression didn***8217;t change then you don***8217;t need one. It wouldn***8217;t hurt to have it checked up after everything is running though just to make sure it***8217;s happy. But I would expect any changes to be minor, if at all.
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Old 10-12-2020, 09:31 AM   #3
BlackFighter
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Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:
2004 WRX STI Black
RalliSpec Shortblock

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I wouldn't worry to much about it. As long as no new parts were installed that can effect numbers, your fine.
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Old 10-12-2020, 10:52 AM   #4
rtv900
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Member#: 428511
Join Date: Aug 2015
Location: philadelphia
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2016 STI

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no don't waste your money
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Old 10-12-2020, 12:21 PM   #5
WRXXXED
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Member#: 432652
Join Date: Oct 2015
Location: Gap, PA
Vehicle:
2010 Subaru WRX STI
61K (Gray)

Default

Sounds good everyone, thanks for the quick responses
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