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Old 07-25-2011, 10:50 PM   #1
Pirate Steveo
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Member#: 276925
Join Date: Mar 2011
Location: Northwood Ohio
Vehicle:
2005 WRX Wagon
Black

Default high rpm knock

Here's my issue , i recently bought an AP for my 05 wrx with current mods of sti up pipe, esx catless down pipe and blitz nur spec cat back. Every time i get on expressway or do some aggressive driving i get a very noticable higher rpm knock everytime. Ive been in contact with cobb for help but it never hurts to get some opinions from others. I have since swapped out MAF sensors as asked by cobb with no difference. Ive tried both 91 and 93 ots stage 2 maps. ive tried different gas from another station as well. I will be changing spark plugs in a few days as requested by cobb and also its good maint. (52k on motor) Is there something obvious i could look for. I am mechanically inclined but the tuning stuff is not my cup of tea. I do not have a wideband and it will be a few weeks to save up some $$ to get one and to get a tuner to look at it. Is there anything else i can test/check in the meantime cause i definitely do not want to destroy my car. In advance im sorry if i posted this in the wrong section just looking for help. Link to my data logs below, All pulls were done at WOT in third gear. If i missed any info needed let me know please


https://spreadsheets.google.com/spre...hl=en_US#gid=0
https://spreadsheets.google.com/spre...hl=en_US#gid=0
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Old 07-26-2011, 02:39 PM   #2
Cobb Tuning
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Location: Austin, DFW, Portland, SOCAL
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What do the stock and stage1 calibrations do? Are you seeing lots of knock all the time no matter what calibration you are running? We need to start digging into what is going on with your car. It is odd that you are seeing that much knock. If the MAF sensor did not solve the issue, then it might be a deeper problem!

Travis
COBB Tuning
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Old 07-26-2011, 04:04 PM   #3
Pirate Steveo
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Member#: 276925
Join Date: Mar 2011
Location: Northwood Ohio
Vehicle:
2005 WRX Wagon
Black

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I have not tried stage one maps I will keep that in mind. I am taking the car into a tuner tomorrow to see what's up I will update this thread when I find out something . Thanks for all the help so far Travis
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Old 07-26-2011, 04:27 PM   #4
WhyHelloOfficer
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Chapter/Region: South East
Location: Tampa, Fl
Vehicle:
2004 Matte White GTO
Australian Racecar

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Swapping to colder plugs is definitely a good idea. Look for the NGK BKR7E's, it is easiest to ask your local DAP to search by Stocking Number, the BKR7E's are #4644.

The other thing I would suggest is checking your car for boost leaks, with the heat cycling under the hood, it literally makes rubber vacuum lines hard and brittle, which can lead to them cracking. Any of these leaking hoses can allow unmetered air into the intake tract.

The factory rubber/plastic turbo inlet is also notorious for tears where it mounts to the inlet on the factory turbo, and can allow unmetered air into the motor at WOT, which can result in you leaning out and knocking.

A useful thread for checking your car for boost leaks is:
http://forums.nasioc.com/forums/showthread.php?t=879900
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Old 07-26-2011, 10:10 PM   #5
Pirate Steveo
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2005 WRX Wagon
Black

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UPDATE.....i swapped plugs and such a difference. Zero knock car is now fixed thanks!
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