Originally Posted by Element Tuning
It's a tough situation because Subaru won't let anyone know what has or hasn't changed and when. We have 704 blocks built over 700 whp and we've had 3 failures at 550-600 whp. We reinforced a block and the problem magically goes away?
You will never know if your older 704 block is good or not until it's too late. If Subaru fixes what I believe is a problem, we'll never know because we won't take that chance with our customer motors
I can tell you with the number of calls I'm getting about these block failures, some in their 3rd block, it's far more widespread and issue than is being posted about. Now the fact they are breaking under 400whp has to do with using the oem ecu and letting too much detonation through which massively spikes cylinder pressure so it might as well be 600 hp.
How long have you tested this block reinforcement? With only 3 failures that you have seen, its not like they are failing daily or even weekly. I guess so far the blocks you have reinforced haven't failed, how many have this done and what kind of mileage so far on them?
Im just really curious into your block reinforcement, care to show pics or what has been done to block?
Originally Posted by aboothman
Kellygnsd already covered this one...although it would be interesting to hear from someone inside SOA, or more likely a dealership mechanic, if this is a legit issue.
I have worked for 2 different dealers in NC. I talk to quite a few dealer techs and talk to subaru at training centers and on occasion with reps. I havent heard or seen any failures in OEM builds. I did see one block with cracked cylinder wall that was build by another shop, but I was told that car was running untuned with larger turbo and boost control would vary from 15lbs to 30lbs. So I think reason for that failure was high cylinder pressures, not a problem with block manufacturing.
Now I have seen some cracked ringlands but thats not this issue.