FP Turbo Install (FP3052) Question - Compressor Housing Retaining Bolt vs. Block?

[Peepers]

Hey Guys,
I just finished up installing my FP3052 and I have a question about the compressor housing and where one of its retaining bolts makes contact with the block.

With the turbo on the bench, the turbo compressor fins seemed to be 100% centered in the compressor housing and I thought all was good. When I bolted up the turbo and torqued all exhaust mani, downpipe and exhaust system’s nuts and bolts, I noticed that the compressor fins were now slightly (and I mean slightly) rubbing one side of the compressor housing. So I thought that maybe during my install, I banged the turbo a little causing things to come out of centre? So out it came, back on the bench and I centered everything up again – checked everything with a feeler gauge and all seemed perfectly centered. Everything went back in, again all the bolts torques and the same thing happened. So thinking about it a little more, I came to realize that one of the compressor housing retaining bolt heads was coming in contact with the block and when I torqued everything down, there was nowhere for this to move thus it caused one side of the compressor housing to slightly move. So out it came one more time and I ground down that specific nut's head to less than half its original size and bolted everything back up. When all was torqued, I didn't notice that issue anymore.

Now my question is, since that specific bolt is still slightly touching the block , should I be worried about this? With the motor vibrating, could it cause issues??

You must be logged in to view this image or video.

Here’s the clearance I have now with everything bolted up … but the car has only been started for 2 minutes, left to idle and then shut off. It hasn’t seen any street time or boost

You must be logged in to view this image or video.

You must be logged in to view this image or video.

Another question I had was what are those three tiny holes in the compressor housing for? Reason I ask is that when I did a boost leak test, air was coming from those holes and sneaking past my silicone coupler – even with a t-bolt clamp installed and cranked real tight. I’m thinking I might just put a tiny bit of JB weld in each one those holes to seal them up? Thoughts?

You must be logged in to view this image or video.

 

[brian9397gsx]

personally i would of ground a little from the block and probably still would till i had at least 1/16th. just so i felt good about it. as far as the holes i dont know what they are for (im guessing surge) but i would leave them they are there for a reason otherwise they wouldnt be there

 

[boosteclipse]

I had compressor fin clearance issues with my new fp green last week. Did'nt think of checking if it was bottoming out on block like yours. They had me send it back to check it out, should be there monday.

 

[romeen]

personally i would of ground a little from the block and probably still would till i had at least 1/16th. just so i felt good about it. as far as the holes i dont know what they are for (im guessing surge) but i would leave them they are there for a reason otherwise they wouldnt be there

Agreed.

You can also consider replacing that bolt with a socket button head bolt. They are low profile but more importantly (for your specific case) the edges of the bolt head taper down which may help.

BUT, in my experience the sockets of these tend to strip/round out easily so I would suggest using them only for low torque loads.