New manifold/turbo bolts

[DeNoZZo]

I ordered some arp manifold/turbo bolts from extreme psi because right now I have one that is broken off, and i think it may be causing a boost leak. My question is that the picture shows four bolts, and the car normally should have three bolts and one stud with a nut on top, correct? Is having just four bolts in there going to make any difference?

 

[turbosax2]

From the factory the car has 3 bolts and 1 stud. Replacing the stud with a bolt simply makes removing the turbo a little easier.

 

[zero97tsi]

the stock turbo has a stud, if you go after market they use 4 bolts instead of 3 + stud. I dont really understand your question but it will not be detremental to have 4 bolts instead of 3 and a stud. you could always just use the stud still and only 3 of your new bolts

 

[0001]

i'd use 4 bolts that stud pissed me off cause i couldnt get my turbo off cause of it.

 

[kahl23]

I ordered some arp manifold/turbo bolts from extreme psi because right now I have one that is broken off, and i think it may be causing a boost leak. My question is that the picture shows four bolts, and the car normally should have three bolts and one stud with a nut on top, correct? Is having just four bolts in there going to make any difference?

There is no way that you have a boost leak between your manifold and turbo, because there is no boost there. However, there is exhaust there, and a broken bolt could very likely be causing an exhaust leak. One other thing to consider is that I remember I had some ARP turbo bolts that I ended up not being able to use because I switched to a tubular manifold, but before I did I read that some people had been shearing off ARP turbo bolts in the turbine housing because the material ARP used expanded and contracted at different rates than the turbine housing/manifold. Just something to consider.

 

[99gst_racer]

One other thing to consider is that I remember I had some ARP turbo bolts that I ended up not being able to use because I switched to a tubular manifold, but before I did I read that some people had been shearing off ARP turbo bolts in the turbine housing because the material ARP used expanded and contracted at different rates than the turbine housing/manifold. Just something to consider.

It's actually a combination of two things. A 8740 chrome moly bolt threading into cast iron, and the fact that it's fine thread. I had issues breaking ARP and factory OE bolts in the turbine housings. The fix? I drilled out the holes in the turbine housing and tapped them for a slightly larger diameter, corse thread bolt. Never had an issue again.