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Old 07-01-2021, 07:12 PM   #1951
De36
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Member#: 475437
Join Date: Oct 2017
Location: Connecticut
Vehicle:
2018 WRX
White

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Quote:
Originally Posted by basyager View Post
You mean the fluid overheats cuz calipers can't dissipate the heat? If so, wouldnt it have to start boiling to have an effect? I just dont understand how calipers can overheat. Theyre just pieces of iron
Larger calipers & rotors = more mass = more heat (aka thermal energy) absorption. Which means the pad can take more thermal energy & stay cooler longer. Pads have a working-heat range that they have to stay within. Above this working heat range will cause brake fade.

Cooling comes from things like ducts, rotor fins, etc... You can use thermal paint to determine cooling: LINK

Fluid boiling is a function of fluid type (e.g. Motul 600 vs 660). Which causes a spongy pedal.

Hope I explained that clearly...
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Old 08-06-2021, 09:51 PM   #1952
milkywitness
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Member#: 522156
Join Date: Feb 2021
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Quote:
Originally Posted by De36 View Post
Larger calipers & rotors = more mass = more heat (aka thermal energy) absorption. Which means the pad can take more thermal energy & stay cooler longer. Pads have a working-heat range that they have to stay within. Above this working heat range will cause brake fade.

Cooling comes from things like ducts, rotor fins, etc... You can use thermal paint to determine cooling: LINK

Fluid boiling is a function of fluid type (e.g. Motul 600 vs 660). Which causes a spongy pedal.

Hope I explained that clearly...
Helps me at least lol
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Old 03-09-2022, 04:08 PM   #1953
spkrfrk
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Member#: 529167
Join Date: Mar 2022
Default Newbie here with a broken clutch and Tranny 2015 Wrx limited. :/

Hey guys and gals, iím a newb to this forum and stoked to be here! Unfortunately iím also here because according to Subaru my clutch broke and screwed up my transmission. I bought the car at a used car dealer @54k miles and it drove great, no upgrades, completely stock to 89k mikes.

The Dealer is saying i need a new clutch and tranny rebuild. They want to charge $5,140 dollars. I can afford it so thatís not an issue i just wanted to reach out to see, since iíve almost paid off the car and do plan on keeping it and modding it down the road what other options are out there as far as upgrading to a used Sti tranny for example or upgrading the clutch. Though Iíve owned 4 STiís and this my first WRX iíve always had them stock - Iíve seen plenty of posts on these forums about Ďgoing to stage 2í etc and was wondering since its gonna cost a pretty penny what you all think i should do.

Any advice is greatly appreciated, thank you.
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Old 03-09-2022, 06:14 PM   #1954
my name is joe
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Member#: 171412
Join Date: Feb 2008
Chapter/Region: SCIC
Location: SQC-NY
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Quote:
Originally Posted by spkrfrk View Post
Hey guys and gals, iím a newb to this forum and stoked to be here! Unfortunately iím also here because according to Subaru my clutch broke and screwed up my transmission. I bought the car at a used car dealer @54k miles and it drove great, no upgrades, completely stock to 89k mikes.

The Dealer is saying i need a new clutch and tranny rebuild. They want to charge $5,140 dollars. I can afford it so thatís not an issue i just wanted to reach out to see, since iíve almost paid off the car and do plan on keeping it and modding it down the road what other options are out there as far as upgrading to a used Sti tranny for example or upgrading the clutch. Though Iíve owned 4 STiís and this my first WRX iíve always had them stock - Iíve seen plenty of posts on these forums about Ďgoing to stage 2í etc and was wondering since its gonna cost a pretty penny what you all think i should do.

Any advice is greatly appreciated, thank you.
Upgrade to a 6 speed. It's about the same cost as Subaru fixing it.ep
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Old 04-18-2023, 09:39 AM   #1955
MarkC
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Member#: 533947
Join Date: Apr 2023
Chapter/Region: International
Vehicle:
2015 WRX
Blue

Default New to WRX

Thanks for this info. Never knew about NASIOC
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Old 09-22-2023, 02:39 AM   #1956
ilikain
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Member#: 535195
Join Date: Aug 2023
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Was going to post a help request but since this is about a 2015 WRX thought maybe I could post it here.

2015 WRX, manual 6 speed transmission. 160k miles. Just had $3k work done on the Timing Chain, also had a solenoid replaced... can't find the paperwork, but think it was cam shaft related.

During acceleration the car becomes extremely jerky the majority of times (very rarely it runs smoothly with no issues).
Happens around 2.5k rpm and seems to happen pretty consistently up into high speeds/rpms, but the jerkiness tails off at highway speeds and only happens during acceleration. More pronounced at lower speeds.
As the boost starts to engage it feels like a delay in the power transfer a short lag and the the acceleration hits hard and jerks the car around. PSI on the boost meter bounces with the jerks.
The turbo itself has a more pronounced whine to it that also persists longer than normal.
Fuel efficiency has dropped from about 23mpg combined to under 17mpg combined.
There is no engine light on and it never turns on.
Subaru dealership reset my ECU and updated the firmware and it seemed to go away on the drive home, but was there the next time I ran the car. They found no other issues.
When the car is shut off after driving I am smelling something that smells a bit more like burning rubber than oil, but is light and isn't as pronounced as straight burning rubber, if that makes sense.
In California and always use premium 91 octane gas. No knocking during acceleration either.

Just trying to point a mechanic in the right direction to get this fixed, but no one seems sure of what it is. Definitely wasn't the timing chain. Not mechanically learned, so ask any questions that would help.

Thanks in advance.
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Old 09-22-2023, 02:40 AM   #1957
ilikain
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Member#: 535195
Join Date: Aug 2023
Default

duplicate

Last edited by ilikain; 09-22-2023 at 05:49 PM.
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Old 11-07-2023, 08:38 AM   #1958
grifone1977
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Member#: 534773
Join Date: Jul 2023
Default timing belt

goodbay..sorry for my english....
i have to replace the kit timing belt to my wrx sti 2015 modello gj 221 kw ej25
which kit gates is correct for my car?
gates KP25612XS-3??
thanks for your help
Stefano
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Old 11-20-2023, 08:43 PM   #1959
stopdroprocknroll
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Member#: 478560
Join Date: Dec 2017
Default awesome

great post man. have had great times in my 2015
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Old 02-12-2024, 11:46 PM   #1960
charlie24
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Join Date: Feb 2024
Default So helpful

This is awesome. Thank you so much
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Old 02-27-2024, 04:12 AM   #1961
legrand
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Join Date: Feb 2024
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thank you very helpful
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Old 03-02-2024, 01:44 AM   #1962
kamillenielsen
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Join Date: Nov 2023
Chapter/Region: SCIC
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Nicely done Gro!
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Old 03-20-2024, 02:58 PM   #1963
JIGG
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Join Date: Jul 2009
Chapter/Region: Tri-State
Vehicle:
2005 STI
BLACK GOLD RIMS

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