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Underdog

I Donated Too
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Posts posted by Underdog

  1. I have the Mishimoto x-line in 08 STI fitment. I’ve had it for maybe 13-14 years. The thicker core is a bit of a pain and the extra capacity is unnecessary for a street car. The only modification I needed to do was trimming the radiator hoses and clearancing the fan shroud slightly. I would recommend the standard thickness, or the Koyo. Haven’t looked at the price differences recently but I’d lean Koyo if they are in the same ballpark. 

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  2. Decided to change the oil & filter, so pulled off the undertray and gave it a quick visual once-over. Everything looks pretty good - definitely would refresh the brakes in the near future and maybe send the Bilsteins in since they are 10y/o now. They still ride great but could use some TLC cosmetically. 

    Warmed up the car - same misfire symptoms although it did idle very nicely for a good 10 minutes once warm, which had me hopeful the B12 had worked through and confirmed a sticky injector. However the misfire returned. Frustrating!

    Drained the oil and cut open the old filter - pristine. Put on a new Tokyo Roki and filled it up with Rotella T6. 

    Cleaned up the GTspec tray and reinstalled. Now it waits for the injectors and a new OEM O2 sensor. Fingers crossed one of those resolves it because I’m running out of ideas short of pinning out the harness or replacing the ECU.

    Since I still have the Cobb SF intake box out I decided to look at some ways to seal it up better. It draws a lot of hot air from the engine bay and fender well (the GTspec tray doesn’t seal like OEM). Nothing obvious jumped out so now I’m looking for an OEM STI airbox to try fitting in there. Can’t use an LGT airbox because of the STI MAF. Womp womp!

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  3. Only ever been on Mustang dynos so the difference isn’t intuitive to me, but having experienced a few 1.5xtr’s (including my own) I was surprised to see that number on 93 octane. Sorry that it ended catastrophically for you cheeseenlo! 

    When I had my car tuned last I asked for a target boost of 20-21PSI and conservative timing through the midrange. I’m sure that left some on the table, along with other design choices I made, but we ask a lot from pump gas and it’s no fun when it goes wrong.

     

     

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  4. 9 hours ago, Pleides said:

    During tuning the car doesn't seem to exhibit the issue, so maybe something happens when I go over neighborhood bumps or whatever that the ECU reacts to. It generally doesn't happen if I let the car warm up by idling it during cold starts.

    That's a pretty solid clue right there - if it only happens when the car is cold and moving. I'm assuming you've checked the sensor itself? Tightened it down, looked at the wiring, etc.?

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  5. Yes lash was set to the factory spec. 0.2mm intake and 0.35mm exhaust. I only had to do final checks on the engines I built - the machine shop would match the buckets and grind valve stem tips to set the lash. Saved me a ton of time.

    The spec card below says Procam but is a translation from the opposite side which is in Japanese and has them listed as Poncam - the part numbers are the same on both sides of the card (143062 for the set).

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  6. I think my Legacy is still on the original wheel bearings? Only 90k miles though. I know I did the front bearings and axles on my OBXT, but I don’t think I ever touched them on the LGT. 

    I don’t automatically assume anything off eBay must be junk but there are some things that I wouldn’t try if it were a pain to do it twice. Wheel bearings aren’t too bad if you’re not dealing with a ton of rust, which I’m assuming you’re not with only 27k on them. 

  7. 3 minutes ago, Enlight said:

    What ended up being the source of your pulsation? Mine had the same problem but I'm hoping my next tune will take care of that.

    FWIW, I also got the Fluidampr and noticed much smoother idling as well, but I don't think it would solve a stutter issue.

    I'm 99% sure it's due to the front O2 sensor being relocated to the downpipe bellmouth on the twinscroll setup. It appears to be a common issue on USDM cars running twinscroll setups (which is not a large pool to begin with, so take that with a grain of salt) - the last tuner I worked with explained that our ECU lacks the delay parameter to deal with the altered location. It's not definitive but I've turned over pretty much every other stone.

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  8. I went from the Grimmspeed LWFW to the Fluidampr pulley. My car did not have the stutter/false knock issue but did have a slight pulsing at low-load/steady-rpm cruise that I was hoping it would smooth out, and it did to some effect, although I’ve since discovered the cause elsewhere in the system. The main difference I noticed was a smoother idle (in terms of NVH) and the improved flywheel effect at take-off and in between shifts. I suppose the lessened NVH could contribute to fewer perceived knock events but have nothing to back that up. 

    If you go with the Fluidampr you will need to dremel the timing belt cover to make some clearance. Not a big deal, just fyi. 

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  9. No apparent problem with the AVCS - both banks sitting right at 0 degrees during idle while misfiring. No change in symptoms since the other day - cyl #1 near constant at anything under 1500rpm and random intermittent strings on cyl #2. I did sit in the car and watch the O2 and WBO2 while slowly raising and lowering the engine speed - below 1500rpm it stops holding at 14.7 AFR and drops to low 13 before the stumbles start. So right now all I can think is injectors, by process of elimination as well as it making some sense due to the car sitting for long periods of time in between drives.

    It’s going to be sitting for a couple weeks more while I wait for cheeseenlo’s injectors to get serviced at ID and make their way to me, so I washed it and put it up on stands for an oil change. Sure tugs at the heart strings when it’s all cleaned up .

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