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2014 Sierra RCSB Z71 On3 Turbo

Old 12-04-2018, 09:02 PM
  #261  
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Originally Posted by JRoyPDX View Post
I think the use of cheap flex joints plays a big part in it, but I've seen multiple posts about people showing where a braided flex joint blew apart inside and took out a turbo. Enough that I wouldn't use one.

Also, both of those are Vibrant parts, just fyi.
I agree cheaper part and the location I have compared the flex location to other turbo kits. I wish they just moved the flex to the middle of the crossover. It's so close to the edge. Mine blew right in the gap at the last flex ridge. but we also noticed the heat cycles of the exhaust made the pipe flex at both elbows away at the bottom of pipe. We checked a few times the vband and the triple bolt clamp. Turns out there are different flange donut sizes and the on3 flange can bottom out before full seal. I called on3 and they said RTV everything... Never had a issue with header flange leaking but at my torque and the rtv I knew it wouldn't be a issue.
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Old 12-07-2018, 11:24 PM
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Just saw a new kit for sale and the cross over pipe has the stainless braided flex joint. Not sure what the story behind that. If they switched to those or just did a few like that. First pic is of my first On3 flex joint.


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Old 12-08-2018, 05:16 AM
  #263  
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I ended up just getting rid of the flex joint, kept blowing them out. Have yet to have any issues with a solid crossover pipe. I did add a flex joint to my wastegate dump And the down pipe because they do move more Indipendently than the crossover.
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Old 12-08-2018, 10:58 AM
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Originally Posted by RySmDPT14 View Post
I ended up just getting rid of the flex joint, kept blowing them out. Have yet to have any issues with a solid crossover pipe. I did add a flex joint to my wastegate dump And the down pipe because they do move more Indipendently than the crossover.
that is my plan if this vibrant flex I have now lets out. The vband gives no room for error but the other side(passenger) has adjustable some what. I think ON3 just installs them to account for the differences in trucks and kits that may happen. I'm keeping a eye on mine, expecting it to go out.
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Old 12-08-2018, 11:39 AM
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Yeah, my truck is lifted 10 so I was able to sit under it and weld up the crossover... otherwise I see how a flex joint would make it much easier to install the crossover.
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Old 01-15-2019, 06:59 PM
  #266  
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wow i cant believe i remembered my pwsd, havent longed in since 2015! i seen your thread so i wanted to chime in.

after some research i dove in head first and bought an ON3 kit on my 2016 5.3 crewcab z71, read countless reviews both good and bad, so i took slow without any fear, first turbo install i have ever done by myself all done in my garage, put in this past june 18', no major issues during install except oil leak in oil drain hose. installed a hydraulic hose (problem solved).. have since put over 13,5xx miles on the kit, i drive it daily 100miles round trip....i installed the turbo kit as it came, trailer ed the truck to victoria tx from houston and PatG tunned it, been smoking camaro sss ever since i will post pics later.

question how often do i have to change plugs? installed ngks tr6s
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Old 01-16-2019, 07:36 AM
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^^^ awesome
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Old 05-08-2019, 11:14 PM
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I have just ordered the on3 kit for a 2015 silverado. Could you send me a copy of your tune? I would like to see what was changed and get my tune in the ballpark before driving it to a tuner.
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