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Old 08-06-2018, 03:34 AM   #1
Psycho-82
Scooby Newbie
 
Member#: 489746
Join Date: Aug 2018
Question Overheating and Hesitation issues

Hello, I have a 2016 WRX Sti ~45k miles (~20k on built block). A month or so ago I was headed to vegas in 120 degree whether in stop and go traffic. I noticed my temp started to rise with the AC on. Not wanting to stop or get stuck on the side of the road I decided to suck it up and turn off the AC and deal with the heat. Once back to cruising speeds (85-95ish) The care was constantly around 220-230. Anyways, being as I love my AC so I decided to purchase a koyorad radiator and figured that would take care of the issue. I take another trip the week after the install up to big bear, and while heading up the mountain with a few friends in the car no AC on the car would like''' hesitate. I would be in 3rd (or any gear with higher RPMs) and when I would go for a WOT pull to get around some slower people the car felt like there was someone that would hit the brakes. It was inconsistent and varied in how hard the car would hesitate, but it's enough to worry me. Fast forward to now... Nope, still gets stupid hot super fast and still has this hesitation issue that only happens when the car is "tired" It only appears to happen when its hot outside, been driving it a while, and when going up hills. The cooling system was properly burped and there are zero leaks. I dropped my car off at the place who built the short block and has been my tuner for some time to see if they could figure out what it's overheating... AND the hesitation issue... but of course, it wouldn't do it for them. I get no CELs, I see no coolant in the oil, or visa versa, I see no smoke to indicate ringland failure (shouldn't anyways with forged pistons). I am at a loss as to what this could be. Anyone have similar experience and able to find that cause? Thoughts would be much appreciated. Heres the list of mods if it helps.


Metro Performance built stage II short block
SoCal Porting stock turbo, ported, polished with 20g wheel
ACT Heavy Duty Performance Street Clutch Kit
AEM 320 LPH Fuel pump
AEM 3.5 Bar Map Sensor
Cobb V3 AccessPort
Cobb Downpipe
Cobb Cat-Back Exhaust
Cobb SF Intake with Airbox
Cobb Turbo Heat Shield
Cobb FPR
Cobb Flex Fuel Package
Cobb Battery Tie Down
Cobb "710" Oil Filler Cap
Cobb Wastegate Bracket
Cobb Map Sensor Adapter
FatHouse Fabrications FMIC
FatHouse Fabrications Bumper Bar
GrimmSpeed 38/40mm EWG Uppipe
GrimmSpeed Boost Control Solenoid
Grimmspeed Hella Horn Bracket
GrimmSpeed Radiator Hoses
Hella Horns Supertone Kit
IAG Street Series AOS
IAG Top Feed Fuel Rails with Fuel Dampers
IAG Braided fuel line kit routed into parallel set up
IAG Windsheild Washer Fluid Cap
IAG Engine Oil Dipstick
IAG Power Steering Reservoir Cap
IAG TGV Housings with Phenolic Spacers
IAG MAF Block Off Plate
IAG Air Pump Delete
ID 1000cc Injectors
JT Speed Density Kit
Killer B Oilpan, Baffle, Oil Pickup
Killer B 4-1 Holy Header
Koyorad Aluminum Radiator
Mishimoto Upper Radiator Brackets
Perrin Turbo Inlet Hose
Perrin Protoype Gurney Flap
Perrin Master Cyliner Brace
Perrin Boost Solenoid Cover
Perrin Pulley Cover
Perrin Radiator Shroud
Perrin Pitch Stop Mount
Perrin Pitch Stop Brace
Perrin 25MM Wheel Spacers
Powerslot Slotted Front and Rear Rotors
Stoptech Stainless Steel Front and Rear Brake Lines
Tial Q Blow Off Valve
Turbosmart Compgate 40 EWG
Whiteline Front and Rear Sway Bar Kit with Endlinks
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Old 08-06-2018, 06:21 AM   #2
billyboy999
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Member#: 292919
Join Date: Aug 2011
Location: Seattle, WA
Vehicle:
2007 STi
Silver

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Could be spark plugs getting worn. Are the plugs 20K miles old, and have you had the 20G all 20K miles as well? Happened to me shortly after I got my 20G, although for me it was during winter when air density is higher, so easier to get spark blowout on worn plugs.
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Old 08-06-2018, 10:39 AM   #3
Psycho-82
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Member#: 489746
Join Date: Aug 2018
Default

Quote:
Originally Posted by billyboy999 View Post
Could be spark plugs getting worn. Are the plugs 20K miles old, and have you had the 20G all 20K miles as well? Happened to me shortly after I got my 20G, although for me it was during winter when air density is higher, so easier to get spark blowout on worn plugs.
The sparks plugs have the same mileage as the build ~20k, and yes the same mileage on the turbo.
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Old 08-13-2018, 03:33 AM   #4
subaru_gc8
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Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
Vehicle:
2004 WRX wagon
silver

Default

have you been able to datalog the problem?
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Old 08-18-2018, 07:10 AM   #5
Psycho-82
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Quote:
Originally Posted by subaru_gc8 View Post
have you been able to datalog the problem?
No I have not. If I do... what should i be logging?
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Old 08-18-2018, 08:43 AM   #6
Chaudruc
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Member#: 490311
Join Date: Aug 2018
Chapter/Region: South East
Location: Florida
Vehicle:
2006 WRX STI
World Rally Blue

Default

What oil are you running? I know it sounds weird to think it could be a oil problem but on my 06 it did the same thing because i was running a 10w40 in the Florida heat and switched over to 5w30 and it never did it again.
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Old 08-18-2018, 04:11 PM   #7
Psycho-82
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Member#: 489746
Join Date: Aug 2018
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Im running Schaffers 5w40
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