Nissan 370Z Forum  

My Invidia Gemini issues.

A couple of months ago I started hearing a faint exhaust leak on the drivers side. Did some investigating and research and it was clear the leak was coming from

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

Reply
 
LinkBack Thread Tools Display Modes
Old 01-17-2012, 01:23 PM   #1 (permalink)
Enthusiast Member
 
Join Date: Aug 2010
Location: Tamarac FL
Posts: 324
Drives: 10 Nissan 370Z MB M6
Rep Power: 177
gaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond repute
Default My Invidia Gemini issues.

A couple of months ago I started hearing a faint exhaust leak on the drivers side. Did some investigating and research and it was clear the leak was coming from the drivers flex pipe on decel. No problem. Wrote Invidia and they shipped me out 2 new flex pipes for free. Which was good customer service as far as I am concerned as my ex-gf bought me it and I have no idea what vendor she went to. Finally got them and I figured all would be well.

Wrong.

Sunday night I throw the car up on jackstands and start on replacing the flex pipe portions. Drivers side was done. Fired the car up,drove a bit and heard a little leak from the passenger side. Replaced the passenger side and fired the car up again to check. Whoa, car sounds significantly louder...great. Get back under the car and start looking around. Apparently, the flex pipes sent were just SLIGHTLY shorter than the original. When i tightened the bolts on the rear section it broke the weld on the flange for the X-pipe. So basically the pipes were just kind of hanging there.

Awesome. So now I have a much bigger leak than before and no way to fix at the time (12:30AM Monday morning). The exhaust shop I normally go to opens at 7:30am so I figured I would pop over there a little early and get it rewelded back on.

Get 5 hours of sleep and head to the shop. Guy rewelds the pipes back on (with them on the car, I don't know why he didn't do some spot welds and remove, but whatever). $40 and I am on my way. Until I get home and realize I am still hearing a leak coming from the xpipe area. Turn around and go back to the shop. Guy redoes it and said there was a small leak on the top of the pipe. No problem, welds it up and I am on my way.

Drive to work today and I am still hearing a leak, and it is coming from the rear where the xpipe is located.. Won't be able to take it back until Saturday. I emailed invidia about it and they want $100+shipping for a new xpipe section. I think the price is a little steep as it is to replace a broken weld from them. However, since they were helpful with the replacement of the flex pipes, I can't be mad at them for anything. I'm in no way trying to rip them off.

My only options now are to just wait it out and go to the exhaust shop on Saturday in hopes they can hear what I am hearing and fix it or just say screw it and go with something like the CNT or topspeed exhaust. I really like the way the gemini sounds, but I am not sure if I want to deal with any other issues with welds breaking or flex pipes leaking.
__________________
2010 Magnetic Black Metallic 370Z 6M
stillen gen 3 CAI - topspeed test pipes - invidia gemini CBE - UpRev tune
301whp (HP Logic Mustang Dyno)
gaveup is offline   Reply With Quote
Old 01-17-2012, 03:15 PM   #2 (permalink)
The370Z.com Sponsor
 
Mike's Avatar
 
Join Date: Jun 2009
Location: Loganville, GA
Posts: 5,941
Drives: 370z
Rep Power: 2182
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

I would just have the muffler shop fix it.
__________________
NISSAN: 86 300ZX GLL / 09 370Z Racecar
BMW: 10 Z4 35i
PORSCHE: 12 13 911 S / 15 Cayenne Diesel
RAM: 16 Sport Crew Cab Hemi
Mike is offline   Reply With Quote
Old 01-19-2012, 09:14 AM   #3 (permalink)
Enthusiast Member
 
Join Date: Aug 2010
Location: Tamarac FL
Posts: 324
Drives: 10 Nissan 370Z MB M6
Rep Power: 177
gaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond reputegaveup has a reputation beyond repute
Default

That's what I will most likely end up doing. Just sucks that this had to happen. Usually welds don't just break with tightening up a bolt. Hell, most exhausts I have had and worked on I had it hit the flange with a mini sledge to remotely even thin about breaking a weld. Let alone pull the pipe clear off.

When I brought it to the exhaust shop on monday, I had to go twice because there was still a little leak. When it was up in the air and they were reving it, I didn't hear it anymore. Now I am noticing the distinct ticking like sound of a leak.

It just bothers me to think that if the quality control over the exhaust was better, maybe this wouldn't be the case. But, knowing it's one of the cheapest exhausts out there, what can be expected?
__________________
2010 Magnetic Black Metallic 370Z 6M
stillen gen 3 CAI - topspeed test pipes - invidia gemini CBE - UpRev tune
301whp (HP Logic Mustang Dyno)
gaveup is offline   Reply With Quote
Old 01-21-2012, 08:13 PM   #4 (permalink)
Base Member
 
ronn1's Avatar
 
Join Date: Aug 2011
Location: Los Angeles Ca
Posts: 53
Drives: Nissan 350Z M6 08
Rep Power: 10
ronn1 is on a distinguished road
Default

Quote:
Originally Posted by gaveup View Post
That's what I will most likely end up doing. Just sucks that this had to happen. Usually welds don't just break with tightening up a bolt. Hell, most exhausts I have had and worked on I had it hit the flange with a mini sledge to remotely even thin about breaking a weld. Let alone pull the pipe clear off.

When I brought it to the exhaust shop on monday, I had to go twice because there was still a little leak. When it was up in the air and they were reving it, I didn't hear it anymore. Now I am noticing the distinct ticking like sound of a leak.

It just bothers me to think that if the quality control over the exhaust was better, maybe this wouldn't be the case. But, knowing it's one of the cheapest exhausts out there, what can be expected?
I have 08 350Z with Gemini. Had it on with stock cats..no problems..and now with FI resonated HFC..no problems. I wonder if your initial problem was caused by the test pipes? Maybe the fit caused some added stress to the flex sections? Test pipes also give off more HEAT, but Invidia offers a TP...so that *shouldn't* be the problem.
__________________
08 Touring 6sp/Nismo intake/Gemini CB/FI RHFC/Tanabe Rear SB/ Nismo S Tune Springs-Shocks/Konig 9.5" with Cooper Zeon Rs-3/Osiris Tune
ronn1 is offline   Reply With Quote
Old 01-23-2012, 05:40 PM   #5 (permalink)
A True Z Fanatic
 
esfourteen's Avatar
 
Join Date: Mar 2010
Location: LI, NY
Posts: 1,375
Drives: 40th TT
Rep Power: 14
esfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud of
Send a message via AIM to esfourteen
Default

Flex pipes on the gemini break quite easily if you don't re-use the factory cat-bracket that connects the cats to the transmission. Its typically removed when installing test pipes and people tend to forget to re-install it.
esfourteen is offline   Reply With Quote
Old 01-23-2012, 05:57 PM   #6 (permalink)
A True Z Fanatic
 
Join Date: Jan 2010
Location: Windermere, FL
Posts: 1,618
Drives: '13 XKR-S, '10 370Z
Rep Power: 15
AlphaSnacks is on a distinguished road
Default

New Invidia flex pipes have been changed actually. They've moved the flex section further back away from the test pipe/HFC area, which prevents them from flexing at the worst location. They are now at the elbow/bend portion, about 10 inches further back. I received the new ones are replacements, they're much better.
AlphaSnacks is offline   Reply With Quote
Old 01-24-2012, 02:09 AM   #7 (permalink)
Base Member
 
ronn1's Avatar
 
Join Date: Aug 2011
Location: Los Angeles Ca
Posts: 53
Drives: Nissan 350Z M6 08
Rep Power: 10
ronn1 is on a distinguished road
Default

Quote:
Originally Posted by esfourteen View Post
Flex pipes on the gemini break quite easily if you don't re-use the factory cat-bracket that connects the cats to the transmission. Its typically removed when installing test pipes and people tend to forget to re-install it.
My FI Resonated HFC doesn't use the factory bracket...no problems with Gemini (350Z HR) flex sections. HFCs weigh much less than stock cats (mine weighed 5 lbs less each), so the need for bracing should not be an issue. Just my take.
__________________
08 Touring 6sp/Nismo intake/Gemini CB/FI RHFC/Tanabe Rear SB/ Nismo S Tune Springs-Shocks/Konig 9.5" with Cooper Zeon Rs-3/Osiris Tune

Last edited by ronn1; 01-24-2012 at 02:14 AM.
ronn1 is offline   Reply With Quote
Old 01-24-2012, 12:05 PM   #8 (permalink)
A True Z Fanatic
 
esfourteen's Avatar
 
Join Date: Mar 2010
Location: LI, NY
Posts: 1,375
Drives: 40th TT
Rep Power: 14
esfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud ofesfourteen has much to be proud of
Send a message via AIM to esfourteen
Default

Quote:
Originally Posted by ronn1 View Post
My FI Resonated HFC doesn't use the factory bracket...no problems with Gemini (350Z HR) flex sections. HFCs weigh much less than stock cats (mine weighed 5 lbs less each), so the need for bracing should not be an issue. Just my take.
I broke 2 flex pipes within 100 miles of each other (both passenger side) after installing test pipes. After re-installing the bracket I never had an issue. I started a thread on it sometime last year, quite a few users had the exact same problem.

Bracing isn't just about weight, it's about controlling the vibrations/flexing that can occur. You have a 350 with an HR and while similar, they are different enough for an issue like this to be present in our cars but not yours.
esfourteen is offline   Reply With Quote
Old 01-26-2012, 01:41 AM   #9 (permalink)
Base Member
 
ronn1's Avatar
 
Join Date: Aug 2011
Location: Los Angeles Ca
Posts: 53
Drives: Nissan 350Z M6 08
Rep Power: 10
ronn1 is on a distinguished road
Default

Quote:
Originally Posted by esfourteen View Post
I broke 2 flex pipes within 100 miles of each other (both passenger side) after installing test pipes. After re-installing the bracket I never had an issue. I started a thread on it sometime last year, quite a few users had the exact same problem.

Bracing isn't just about weight, it's about controlling the vibrations/flexing that can occur. You have a 350 with an HR and while similar, they are different enough for an issue like this to be present in our cars but not yours.
Glad it worked out with the bracket fix. Good points...so weight wasn't an issue there. Like OP, I see you installed a TP...not an HFC. I wonder if TPs tranmit more vibrations than HFCs?
__________________
08 Touring 6sp/Nismo intake/Gemini CB/FI RHFC/Tanabe Rear SB/ Nismo S Tune Springs-Shocks/Konig 9.5" with Cooper Zeon Rs-3/Osiris Tune
ronn1 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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
Looking for a Invidia Gemini CBE Lobo1114 Wanted 3 01-08-2012 08:28 PM
Invidia Gemini - Anyone else having issues? esfourteen Intake/Exhaust 74 05-13-2011 06:27 PM
Invidia Gemini + Invidia HFC's - anyone experience with this setup? JTTZR Intake/Exhaust 17 03-27-2011 06:11 AM
FS: Invidia Gemini Exhaust I Run L.A. Parts for sale (Private Classifieds) 23 03-13-2011 04:57 PM
FS: Invidia Gemini HOOPZ Parts for sale (Private Classifieds) 14 03-02-2011 12:02 AM


All times are GMT -5. The time now is 03:12 AM.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 PL2