Hoverjetb

Hello Folks,

I would first like to say that If there is another thread that has already answered this, please point me in the right direction!

I have a 2006 Legacy GT with ~170,000 miles on the chassis and about 6000 miles on a completely rebuilt motor. It has forged pistons and rods, brand new long block with stage 2 cams, and a VF52 turbo on a 0% waste gate duty tune for break in.

I finished my break in at 5000 miles and I was about to begin tuning when my OEM thermostat died. I know, I know... should have changed it when I was rebuilding but I missed that. I changed it with an Advanced Auto thermostat and that died after 60 miles. It killed my radiator because I thought i could push the high temps for longer then I actually could so I ended up having to replace the radiator and the thermostat. I now have a Napa Thermostat and radiator with roughly 1000 Miles on them together and that Thermostat just died.

I am looking for suggestions on what I can do for troubleshooting because something is wrong and it cant be the thermostat. I would like to fix it before I run through any more thermostats.

Thanks for your input!

May be of the other older members may recall a discussion from years back about opening up the OEM gap also.

It makes sense, considering the higher temps and pressures.

manley pistons & rings? http://www.manleyperformance.com/dl/tech/Subaru-Piston-and-Ring-Installation.pdf

Yep that's the exact page that came in the box.

I would trust what the piston manufacturer says, assuming they are pistons made specifically for your application. OEM piston ring clearances are made specifically for the stock pistons in stock boost conditions; too much boost and the rings can squeeze together and crack the piston ringland.

 

Aftermarket pistons are obviously made for increased performance, they keep in mind that you're running more boost and are stronger than stock. All of this can effect piston ring gap. On top of it all, forged pistons have different thermal expansion than cast pistons and can change things too. Call the piston manufacturer if you're really concern and let them know the boost targets you're planning to run. They can properly advise you.

Thanks! I pretty much came to that conclusion myself. I appreciate your time and response! Have a good one!

Hello, I am in the middle of rebuilding my EJ 257 and I have come to the step of installing the Piston Rings and Pistons. I have a sheet of paper that came with the Manley Pistons I bought that has a specific gap measurement (Bore x 0.006 in) but that conflicts with the Ring gaps specified in the maintenance manual.

I didn't see any previous Forum Post on this subject so I thought I would see if anyone has prior experience/knowledge and might be able to shed some light on this.

Thanks!

there is no getting it to work unless you have access to a machine shop with some serious machining equipment.

 

But if your in a bad bind, the only thing I can think of is gears on the starter, they are setup to work with a specific sized flywheel! So the only thing you have a chance of changing thats cheap is probably the sprocket on the starter. I'm not sure if its pressed on, welded, or a one piece mold. If you can change the sprocket, then maybe, and that is even a long shot

 

Why not return the flywheel?

 

And not all flywheels work with one another, i'm not sure how it is for subaru. but in a lot of cases, certain clutch kits need their own specific flywheel, because the size might be different and won't align with the stock bolt pattern. So make sure ACT clutches don't need a specific designed flywheel that they sell. If it can mount to stock flywheel, then you need to get an 06 wrx flywheel that works with stock application clutch kits.

I plan on returning the flywheel and getting the ACT Flywheel that goes with this specific pressure plate. The kit as well as the engine specify the 2006 WRX Flywheel as compatable so it is still a mystery to me.

There is most likely a different issue. If you were able to install the pressure plate to the flyweel then it's the correct flywheel. Non turbo flywheels have a different bolt pattern for the pressure plate because it is a smaller diameter.

Ok, thanks for the info. I was able to install the pressure plate so that must not be the issue.

Ya, I get what you mean. I definently dont want to buy a new starter on top of everything else.

There is a difference between the Turbo and Non Turbo Flywheels? I've never head/read about that before but it would explain my issue.

I have a 2007 Legacy GT and I am in the process of putting an ACT Clutch kit in it.

https://www.advancedclutch.com/product/hd-perf-street-sprung-sb5-hdss-2?gfid=p4014-c303529

I found out that it needs a WRX Flywheel. No big deal, I thought, so I got one. That brought me to the problem I currently have and hope I can get some help with. The stock starter is having trouble interfacing with the new Flywheel and as a result is making some noise when you try and start it.

I have searched this site along with a couple others to try and see if anyone has had a similar problem but no luck.

Any insight is greatly appreciated.