1.5L power loss due to heatsoak?

[J-DUB]

Hi everyone,
I have driven about 2K miles with my 22 Big Bend since I purchased it (used with 13k miles). My issue is, for the first 2 or so fill ups I was running 87 octane and I felt like the power of this thing was terrible and very sluggish (would either feel like it was going to bog or would have to downshift and accelerate slowly). I then started running 93 octane for the last coupe tanks and the power/drivability has changed for the better substantially, however i have noticed once I drive it for 30+ minutes or sit in a drive through/idle for a bit that sluggishness returns and again this thing starts to lose power. I am assuming that the issue is the computer pulling timing due to hot intake temps/maybe intercooler heatsoak but that is just a guess. I do live in Florida and it has been quite hot and humid lately but the difference between when this is running good vs bad is quite apparent and im was surprised that even running 93 the issue shows its face. Has anyone seen similar issues? does this seem worthy of a trip to the service department? I did notice the previous owner has a K&N drop in filter installed as well.
Thanks for any input!

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[CactusBS]

however i have noticed once I drive it for 30+ minutes or sit in a drive through/idle for a bit that sluggishness returns and again this thing starts to lose power. I am assuming that the issue is the computer pulling timing due to hot intake temps/maybe intercooler heatsoak but that is just a guess.

I think that is fairly "normal", my BS sits in a parking lot at work getting beat down by the sun and on the especially hot days I noticed it hesitating a bit when I first start driving. Once I get a little down the road it starts going away, but definitely some heat soak going on.

I had an older WRX a few years back and the heat soak was unreal on that car, especially with the intercooler on top of the block.

 

[Hot Rod Mike]

110 degrees here in Rocklin Ca. 2023 Big Bend never had a problem with what you’re saying. I have 8000 miles on it and it has never changed performance no matter how hot it gets

 

[thomasm23]

Heat soak?
I have a 21 OB with 96,000 miles. I always use 87 octane. Why would I waste money. I have been in all kinds of weather and altitudes. In August, I was in 110 plus weather all week. No issues.

What mode are you driving in? Normal, Eco, Sport?

Go to a dealer and purchase the proper engine air filter. Throw that K & N filter in the trash.

 

[rocks]

Heat soak?
I have a 21 OB with 96,000 miles. I always use 87 octane. Why would I waste money. I have been in all kinds of weather and altitudes. In August, I was in 110 plus weather all week. No issues.

What mode are you driving in? Normal, Eco, Sport?

Go to a dealer and purchase the proper engine air filter. Throw that K & N filter in the trash.

It's amazing how many people get sucked into buying a K&N filter.

 

[Hot Rod Mike]

It's amazing how many people get sucked into buying a K&N filter.

Your right.

 

[jkeaton]

It's amazing how many people get sucked into buying a K&N filter.

Same with cold air intakes. Don’t get me started on throttle body spacers.

 

[Mark S.]

Heat soak is an issue for any turbocharged engine that's dependent on an intercooler to control intake air temperature. You can confirm this is your issue with a simple test. The intercoolers on these engines are entirely satisfactory for day-to-day driving situations, but it won't work if the car isn't moving--you need to get air flowing through it. When you notice the symptoms occurring get the car on a road allowing you to drive at speed (+50 mph) for a few minutes. If your symptoms do not abate after that then heat soak is not your issue.

A few owners have reported issues with the louver system installed that controls the flow of air into the engine bay. These are supposed to close at highway speed to reduce drag. If yours are malfunctioning they may be staying closed all the time, which would increase engine temperature and cause the PCM to reduce power output.

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