Nissan 370Z Forum  

Some questions after HFC install

After being able to get the stock cats out and the FI RHFCs on, i have some 'issues' that I have came around, especially in reverse! 09 7at I did

Go Back   Nissan 370Z Forum > Nissan 370Z Tech Area > Engine & Drivetrain > Intake/Exhaust


Reply
 
LinkBack Thread Tools Display Modes
Old 06-23-2017, 04:44 PM   #1 (permalink)
Enthusiast Member
 
Join Date: Jun 2016
Location: NorCal
Posts: 259
Drives: 09 Z. 06 Zx636
Rep Power: 29
NRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond repute
Default Some questions after HFC install

After being able to get the stock cats out and the FI RHFCs on, i have some 'issues' that I have came around, especially in reverse!
09 7at

I did have to unbolt the Y pipe- and eventually had to rebolt the whole catback from the cats to the back mufflers so everything will sit norm again.

The rattles like to come around randomly and goes away when stopped. Rattles for sure in reverse. Cruising is as quiet as stock cats.

Vibrations/rattles! I have found the first suspect which is where the midpipe sits. After a quick wrap and wedge, the midpipe rattle that was hitting the brace was out.
License plate rattle was fixed with a quick wedge of rubber.

This last vibration is happening to what I feel like is under me- at the cats. I dont see anything touching. The brace that held the stock cats was removed due to not being able to fit with the o2 bung in the way.
BUT one problem i had is where the 'demon bolts' are, two top bolts. After many cuts and bruises i managed to get the nut on the other side. But now all i can do is turn the bolt tight enough to when the nut on the other side starts turning with.. which is tight... but not as i want them to be. Ha.
Squirt bottle test shows no leak at the demon bolts, both idle and slight rev in park. Everything else to the axled is goodtogo.
No check engine.


When going from a stop, it feels hard. Which is around 1.5-4k when the exhaust sounds the loudest before smoothing out to a mellow vq rumble.






Sent from my SM-G950U using Tapatalk

Last edited by NRGz; 06-27-2017 at 05:26 PM.
NRGz is offline   Reply With Quote
Old 06-27-2017, 05:49 PM   #2 (permalink)
Enthusiast Member
 
Join Date: Jun 2016
Location: NorCal
Posts: 259
Drives: 09 Z. 06 Zx636
Rep Power: 29
NRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond reputeNRGz has a reputation beyond repute
Default

Since no input yet.. i went back under.

Hoping that everything has now settled with the new gaskets all around during the install, I went back down and retightened all the bolts from the cat to the back. Tightened the demon bolts down from the top. T handle clamps for the stillen intakes are a savior. Went for a drive. Vibrations still in the cross bar area for the midpipe.
I went ahead and removed the ARK midpipe and wrapped where it comes close to the bar. Snug fit but now it shouldnt be rattling metal on metal.
Startup sounds much more normal.
Park vibration is gone.
Parking with AC ON vibration is gone.
Reversing vibration is gone.

Driving has some vibrations in the throttle.
Completely stopped at a light in drive. The worst rattle/vibration than before!

Where else could it be hitting? I will usually just ignore it since my rear is gutted, but i have some free time



Sent from my SM-G950U using Tapatalk
NRGz is offline   Reply With Quote
Old 06-30-2017, 04:21 PM   #3 (permalink)
Track Member
 
ZeroZeta's Avatar
 
Join Date: Aug 2013
Location: Austin TX
Posts: 543
Drives: 2013 Z
Rep Power: 13
ZeroZeta is just really niceZeroZeta is just really niceZeroZeta is just really niceZeroZeta is just really niceZeroZeta is just really nice
Default

Check the "W" (tunnel brace) where the midpipe of your exhaust is.

I had to make some adjustments after hfc install as it changed the angle of the rest of the exhaust just slight enough that it would make contact with the brace.

Also check heat shields around the exhaust and adjust for extra clearance if needed.
ZeroZeta is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Last minute install questions Crucified Audio & Video 5 06-25-2016 12:36 AM
Pioneer Install not so good...Questions? Tomboy Audio & Video 26 05-22-2014 04:33 PM
sway bar install questions 370guy Brakes & Suspension 4 04-10-2012 10:20 AM
Kenwood DNX6960 Install Questions xodus Audio & Video 5 06-21-2010 10:47 AM


All times are GMT -5. The time now is 03:17 PM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2