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Old 04-07-2020, 01:39 PM   #2292
Scooby Specialist
Member#: 118630
Join Date: Jun 2006
Chapter/Region: South East
2005 Wrx wagon


Originally Posted by SubyManV7 View Post
quick synopsis, I messed up and it cost me an engine. I accidentally had the wrong map in my ECU from my AP. Stage 2 vs. Stage 2+ Got a CEL code for lean conditions after the car started surging at highway speeds. Changed it to the correct one after driving it like that for maybe 30 miles. But when I went to start it up after work it made a momentary rod knock sound for maybe 1 second then went away. On the drive home of 20 ish miles it progressively got worse and was most noticeable when I would lift off the gas. Haven't completely tore down the engine but I did go ahead and buy a replacement short block and all the recommended replacement parts ie oil pump and cooler etc.
About to break in the new one soon. Will see how it turns out. Definitely getting a pro tune after break in.
I blew an engine after a 'pro tune' because protunes are usually just dynotunes at and around WOT. What REALLY Saves these engines are the road-tune portion which takes more time than most professional tuners will put into it.

If the shop you're working with on the tune is willing to look at logs with you on a regular basis and make adjustments as the seasons change then go for it. Otherwise I'd just make sure you're familiar with logging and making sense of the learned fuel and knock-correction values and making appropriate changes to your tune to keep them within safe limits.

As I learned, you can spin a rod at 30% throttle in 5th or 6th gear cruising down the highway if you get into heavy knock conditions, no dyno will pick that stuff up, that's gotta be done on the road.
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BrandonDrums is offline   Reply With Quote