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Old 08-19-2012, 11:03 PM   #1
vonBiz
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Member#: 326306
Join Date: Jul 2012
Chapter/Region: NESIC
Location: Seacoast, New Hampshire
Vehicle:
2012 WRX
Black

Default 5th gear short shift knock

Not trying to beat a dead horse talking about knock here but i had 2 very high knock readings in the past few days under similar conditions and just wanted to get some thoughts on them.

Both happened in slowish moving highway traffic when I would short shift into 5th at between 50-60mph. I looked down at my accesport monitoring "Feedback knock" and had peak readings of -8.4 and -7 at around 1900-2300rpm heading at maybe a slight uphill with the car lugging under a bit of a load but very light throttle position.

i know it would be ideal to show log data and maybe this info is useless without it but not being able to consistently recreate the situation on demand is difficult. i have had a 3rd gear WOT pull log get checked out and everything looks good. I will log another WOT pull in 3rd and 4th this week to try and provide more info.

the car is a 2012 wrx with stage 2 cobb tune, AEM cold air, Cobb BPV and Cobb down pipe.
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Old 08-20-2012, 12:57 PM   #2
Cobb Tuning
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Location: Austin, DFW, Portland, SOCAL
Default

That is one of the most difficult situations you can put a car in. High gear, really low RPM, and trying to accelerate in any fashion are a recipe for timing corrections. The car may be able to pull it off if you are cruising on a flat road or downhill, but if you needed to climb any type of uphill incline or accelerate in any way, you need to downshift.

The best way I've had it explained to me that made sense was think about riding a bike. While slowly riding along, shift into the highest gear and try to accelerate. It's doable, but it takes a lot of effort and strength to do it. It would be much better to select an appropriate gear and pedal away.

Chris
COBB Tuning
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Old 08-20-2012, 01:00 PM   #3
vonBiz
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Member#: 326306
Join Date: Jul 2012
Chapter/Region: NESIC
Location: Seacoast, New Hampshire
Vehicle:
2012 WRX
Black

Default

Chris, thanks for the response, I'll make sure to drop a gear next time.
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