New 72mm and Motor Build- Odd Noise

[flippincgfighter]

Got my motor all put back together and everything seems great except under a full throttle load i get a real weird noise that sounds like it could be coming from the turbo. I have checked for exhaust and boost leaks but i cant find anything...Can anyone describe what it sounds like when the downpipe rubs the firewall?...It seems like i can feel it thru the pedal.

The noise only comes under hard acceleration and at full throttle or right as i let off. It does not happen every time. It makes 55lbs of boost and 69lbs of EBP in the Spartan 250 tune.

Stock fuel with a 72, No limit intake, HD uppipes and stock intake manifold. No wastegate and a heavy duty valvetrain

Thanks

 

[mclean]

Video?

Sent from my SGH-I337M using Tapatalk 2

 

[webb06]

What's the noise? Like a thump at your feet? Or a high pitched squeal?

 

[3brorce]

If its the DP hitting firewall you would hear, feel it when hitting bumps. Mine hit and you could feel it in the pedal. I just moved my cab back towards the bed some.

 

[black6.4]

Downpipe gets my vote mine does the same when motr twists.....also check your downpipe connection where the two bolts are mine was rubbing on frame or trans brace

 

[jugger13]

99.9% sure its a bolt on the firewall hitting your passenger side up pipe.

Myself and a few others have had the same thing happen.

 

[flippincgfighter]

The noise is like a muffled air horn. Short duration not a long high pitched noise. I can feel vibration thru the pedal. I'll check the downpipe and uppipes again and let you know what I find. I'll also try to get a video.
Thanks for the help

 

[flippincgfighter]

Update: Stud is not rubbing on the passenger side uppipe
My downpipe was real close to the High Pressure fuel line so i adjusted it out of the way but the noise is still there.

Ill try and get a Video today.

 

[flippincgfighter]

Update: Here is the link to the video. The noise occurs @27 Seconds and by watching the video now it looks like it happens right during the shift to overdrive.

http://youtu.be/GXljEcAzc-0

Another noise started occurring, but i think this is the downpipe. When i hit a large bump while turning, i hear a very loud knock/clunk underneath the cab of the pickup. I will move my cab back some and see if it fixes it because there is only currently about 2mm of clearance between the back of the downpipe and the firewall.

 

[Pmac21]

That sounds like air coming back through the intake during the shift and when you let off. Mine does it pretty loud on the 300 tune.

 

[3brorce]

I would agree. Mine does it as well. Noticed it when egr got deleted.

 

[Will@Rudy'sDiesel]

Don't be alarmed buddy, Its coming from the intake. I put the AFE upgrade on mine with a 72 and it makes the same noise.

 

[flippincgfighter]

Awesome thanks for the responses guys. I fixed the other noises last night. Downpipe was hitting the pinchbead on a big bump and making a lot of noise. Also had an uppipe rubbing the heatshield and the ebp tube resonating on the valve cover.

Thanks!