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Old 08-26-2003, 02:55 AM   #1
imprezive one
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2k3 wrx wagon
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Default Help me diagnose my engine problem!

Long story short:

Parts on the car as of now: Turboxs UTEC stage 4, off the shelf stage 4 map, throttle body coolant bypass mod, halman MBC... turbo (vf-30), injectors, fuel pump, and uppipe have been on the car for about 600 miles... turboback has been on there a bit longer. I've noticed the exhaust backfiring a bit before problems started happening, but I think this was just simply due to the conservative off the shelf map and a rich A/F. I was having issues boosting too high (~20 psi) and was knocking the slightest bit on the rare occasions that I pushed the car in the higher gears.

Two days ago I got on the throttle in second gear to pass a car when I hear my exhaust suddenly get a lot raspier and a lot louder from the engine side. The car sounds like it has an old rusted out muffler on it, except I think I've isolated the origin of the new sound to the uppipe/turbo/downpipe area. I checked all of my boost lines, my intercooler piping is secure, my egt probe didn't pop out of my uppipe, I'm not overheating, not leaking any fluids, still building/holding boost just as before, car idles fine and drives fine. Performance is the same with just a slight drop in throttle response and maybe a little bit slower spooling up. I suspect it's my uppipe and the subydude gaskets that I used... maybe those have blown out like they did for other people. Does an uppipe leak have more of a squeeling sound though? This is just a really raspy gurgly type of noise when I get on the gas over ~3k rpm's.

Anyone have any other ideas?
Is internal engine damage a possibility here? Please note that the Nitrous Oxide 50 shot is/was not currently on the car and when it was, only used around 4 times. Also, a compression test was done after uninstalling the nitrous and everything was fine. any suggestions or agreements on the uppipe leak? Thanks.

-DK
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Old 08-26-2003, 08:23 PM   #2
imprezive one
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anyone? anyone? bueller? bueller?
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Old 08-26-2003, 09:43 PM   #3
Unabomber
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You more than likely have a uppipe leak. This is because it is taking longer to get boost and have slower response. I am guessing that you aren't hitting your normal boost level as well.

I would probably guess you have a problem with your subydude gaskets.....JUST LIKE I DID! This thread talks about the problems people have been having with them. This is exactly what my problem looked like:



There was a chunk missing on the engine side of the uppipe to manifold gasket. You can't see it unless you have an inspection mirror. I got my money back from subydude, which is really cool, but feel he does lead people astray. The reason for this is he recommends you re-tighten the gaskets after 100 miles of use. This was emailed to me 2 weeks after my purchase and after 1000 miles of gasket use. After 1500 miles or so on my gaskets, I had a blow out. This advice is also not on the purchase page of his site where you buy the gaskets either. Had I known prior to purchase, I wouldn't have messed with it.

$70 in OEM gaskets and I am good as new now, but really wouldn't recommend these gaskets to anyone. Subydude for other stuff, but not these gaskets.

FYI, I discovered the problem as follows, which is rather different than the other uppipe leak sounds I have read about in the past. Upon start up, I heard say 50% of the regular muffler noise and it seemed like 50% of the noise was coming from under the motor. It really sounded like a loud VW engine. It was tolerable under 3k RPM and no boost. Boost or over 3k RPM and it sounded like a top fuel VW.

Check your gaskets, I am willing bet it is a blow out and maybe in the same location. The pic used above is the blow out from another subydude gasket user with the SAME exact blow out. Best of luck.
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Old 08-27-2003, 10:42 AM   #4
imprezive one
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Default

Thanks a lot man. I managed to get under the car after work yesterday and I did feel a stream of hot air coming from under the car around the area you've described. I'm almost certain that you're right because it does sound like the 50/50 sound mixture that you described, dead on consistent with the below 3k rpm's and no boost also.

Now my question is, $70 in OEM gaskets? They cost that much? I was under the impression that they were a lot cheaper. How many gaskets in total did you change out? Thanks.

-DK
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