Hello, Well. I had my car on a dyno getting it checked over last thurs in preperation for friday at Oran Park. The bloke sorted out a few idle issues I was having, and then started on to some low boost power runs at around 8 PSI. The car made around 250rwkw which I was happy with. Did another run at the same for some fine tuning and made slightly more power. Then on the third run at around 13 psi right near the end of the run power suddenly dipped right off and when he backed off the gas there was a quite large puff of smoke out of the passenger side exhaust, and at the same time a puff of smoke out from near the pass front tyre, right where one of my pod filters is. After that the car definatly did not sound right. Obviously not running on all cylinders and sounded very much like a WRX. The tuner suspected cracked piston or ring land, but evidence might suggest my turbo seals are on the way out also. Drove the car home laying a smoke screen the whole way and noise seemed to get worse, but it was never a metal on metal or clanking sort of noise, just the Subaru boxer engine sort of noise. Relevant info on my car: Stock internals and heads HKS 2530 Turbo's Front mount intercooler (so each bank is fed by opposite turbo) Microtech ECU Dual pods in front corners, no MAF Symptoms: Smoking all the time from passenger side exhaust, extremely bad when revved. Slight smoke from drivers side and has for a little while. Barely noticable, might only be during warm up not sure. Sounds like it's missing at least one cylinder. Some oil in the intercooler pipes coming from the drivers side turbo. Passenger side pipes near turbo seem pretty clean. Reasonable amount of oil in passenger side plenum Alot of oil in drivers side plenum. enough to pool and cover the bottom so it's like looking at a mirror. I then did a compression test and here's what I got. Drivers side Front: 108 Middle: 90 Rear: 110 Pass side Front:98 Middle: Big fat Zero Rear: 111 The zero cylinder spark plug had oil on it, but all plugs were black. Video of smoke http://s111.photobucket.com/albums/n125/infernalmajesty666/?action=view¤t=DSCF7361.flv So it's looking pretty obvious something bad has happened. Zero compression could also be caused from a broken or burnt valve couldn't it? I mean to me I would think the piston would have to be pretty badly damaged to give no compression at all. Most things i've read about people busting ring lands etc either have next to no compression loss or reduced compression, not zero. Thinking about the intake system and how the oil could be getting where it is dosent make sence to me unless it's two unrelated problems ie. Broken piston/valve, and turbo seal or seals. Thanks for reading, and any insights or analytical responces would be very much appreciated. Ben
Definately something wrong there. May be a blown head gasket also. Most likely would be #1 piston failure, #2 head gasket, #3 bent, broken valve. Turbo seals will give you oil in the cylinders but wont affect compression. About the only thing to do is pull the head and check it out. Compression was quite low anyway, so a rebuild wasn't far off.
I agree with you about a rebuild not being far off. The all round low compression sort of explains why the car wasen't making the kind of power a few people said it should be capable of. Soooo, what would I be looking at for you to duplicate all your mounts and manifolds etc so I can just drop in a V8?? hehe Ben
If you are serious, You would be looking at about $1000 for manifolds to suit turbo and mounts. Or an extra $250 for extractors.
Im still trying to wrap my brain around this... "...low boost power runs at around 8 PSI. The car made around 250rwkw..." ...How is that possible? MoulaZX
ah the joys of dyno blowups.... 1st time i put car on dyno, had 1 cyl con 80 compression.... cost me a rebuild. Fun stuff ;/ Welcome to my world. Now save up 5-15k
All I can say is that I had my boost controller set to position 1 (of 4) and the lowest setting is for 8-9 psi. And the number that came up on the computer after the run was 335hp. I don't know what settings the dyno was on or correction values or any of that stuff, just that the guy was tuning as he went so i'm assuming he wasen't doing any sort of "shootout mode" or anything like that. I don't know a huge amount about dynos, but I can certainly read a few numbers off a screen Ben
Yep ... I have GTiR Turbos which are supposed to flow the same as 2530's ... I got 290rwkw @ 12psi ... lowest I could go due to the wastegate springs
My last car did the same, one of the wastegate lines split and had my 2530's unlimited on a mountain run, only took a fraction of a second to lean out and burn a thumb size hole through piston 4. Just became a monstrous WRX sounding oil pump. Whoever had it on the dyno should have been paying closer attention to the motor, it sound like a massive leanout and buggered piston. Rebuild time, or drop in a healthy 2nd hand short block and swap over your modded bits. And rebuild time.
Those dynos sure are hard on engines. I know i wouldn't be going anywhere near one especially with a stock ~20 year old engine, unless I already had a short term rebuild in mind and didn't mind when/if it grenaded... Most original stock zed engines seem to keep going indefinately without major problems UNTIL boost/mods are done. There are many stories of stock TT's clocking 200K+ miles in the states (when appropriately cared for...
Thanks for the replys fellas. I've got another video here, almost certainly another nail in it's coffin http://s111.photobucket.com/albums/n125/infernalmajesty666/?action=view¤t=DSCF7466.flv Smoke coming out the dip stick tube. I can't say i've ever had the dip stick out while the engine is running but I doubt it should be doing this. I've started disconnecting everything. I'll try to get the box out this week and maybe the engine out on the weekend. Time for a look see inside to see where I stand. Thanks Tekky i'll keep it in mind. Hopefully the bores in mine are ok but who knows till I get it all apart. I was going to try to get my hands on a bore scope just to be sure but I guess all the evidence so far is pretty convincing that something major has happened so it's engine out. On the upside i'll finally be able to do a decent clean of the engine bay. Probably just re-spray it while I can. Ben
