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01-23-2018, 03:50 PM | #1 |
Scooby Newbie
Member#: 461391
Join Date: Jan 2017
Location: Bay Area, CA
Vehicle:2017 WRX Base White |
17 WRX J-pipe hitting transmission mounting bracket issue
I finally got my car in stage 2 and I really love the performance and sound.
Only issue is during reverse gear ONLY and with load about 2000 RPM and above then the J-pipe is hitting the transmission bracket as the video shown. I can feel the gas pedal have some resistant when the issue occurring. link below has the videos and pictures of my setup, the bracket with natural sitting position and where we ended up installed and tighten the bolt (IMG_2788) to the bracket location because of less vibration during reverse gear, but now I am worry introducing stress to the turbo studs (or something else) by doing that since we have pushed the pipe toward passenger side (and that the max we can push). The two close up pictures didn't show the bolt was there but we has installed it (just to show how much we have pushed the pipe toward to the passenger side) during the video the bolt is there. Any way, the J-pipe is hitting the transmission mounting bracket ONLY in reverse gear. My mechanic told me it is to due with the drive shaft moves, during reverse it does till the pipe up closer to the car and during forward gear the pipe is further away, so even with the same amount of vibration it won't hit anything during forward gear. I have reach out to GS for help but seem like we couldn't figure out what's going wrong. Just wanna see if anyone who has the same setup as mine and lucky enough with the same issue. Hope can see if anyone has idea how to resolve it. My set up is GS Catted J-pipe and GS resonated CBE. http://drive.google.com/open?id=1-IA...O-VGp1geBCXQJU
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01-23-2018, 04:13 PM | #2 |
Scooby Specialist
Member#: 447566
Join Date: May 2016
Location: GA
Vehicle:2017 86 Black |
My GS catted j-pipe is close but no evidence of any contact, and I’ve checked multiple times. I’m running an OEM STI midpipe though. |
01-23-2018, 04:23 PM | #3 |
Scooby Specialist
Member#: 393629
Join Date: Jun 2014
Chapter/Region:
W. Canada
Location: Calgary
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stock engine and trans mounts right?
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01-23-2018, 04:41 PM | #4 |
Scooby Newbie
Member#: 461391
Join Date: Jan 2017
Location: Bay Area, CA
Vehicle:2017 WRX Base White |
yes, stock engine and trans mounts!
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01-23-2018, 04:44 PM | #5 | |
Scooby Newbie
Member#: 461391
Join Date: Jan 2017
Location: Bay Area, CA
Vehicle:2017 WRX Base White |
Quote:
Did you put a piece of exhaust wrap there? |
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01-23-2018, 05:01 PM | #6 |
Scooby Specialist
Member#: 447566
Join Date: May 2016
Location: GA
Vehicle:2017 86 Black |
I did, to check for contact, and then it fell off soon after.
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01-23-2018, 05:07 PM | #7 |
Scooby Newbie
Member#: 461391
Join Date: Jan 2017
Location: Bay Area, CA
Vehicle:2017 WRX Base White |
It is interesting, mine has more than 1/4" clearance for sure, but during reverse gear (as shown in the videos) it hit like crazy with load.
Hopefully, I don't need to change the engine and trans mount to group N for resolving this issue. LOL! |
01-23-2018, 05:13 PM | #8 | |
Scooby Specialist
Member#: 447566
Join Date: May 2016
Location: GA
Vehicle:2017 86 Black |
Quote:
I have a Group N pitch stop mount and transmission mount, but stock motor mounts. Maybe those 2 mounts are enough to prevent contact? |
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01-23-2018, 05:15 PM | #9 |
Scooby Specialist
Member#: 393629
Join Date: Jun 2014
Chapter/Region:
W. Canada
Location: Calgary
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i wouldn't worry about the turbo studs, you've got plenty of flex. it's the whole motor/turbo/intercooler etc assembly that moves a lot. try upgrading your transmission mount to the group N and see if it still makes vibration contact. i personally went all out and did all my mounts and the sheet metal banging stopped entirely.
either way. mounts were the best upgrade i did to the car. |
01-23-2018, 05:48 PM | #10 | |
Scooby Specialist
Member#: 447566
Join Date: May 2016
Location: GA
Vehicle:2017 86 Black |
Quote:
Agreed. And with rear diff and crossmember inserts, it’s even better. |
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01-23-2018, 06:02 PM | #11 |
Scooby Specialist
Member#: 393629
Join Date: Jun 2014
Chapter/Region:
W. Canada
Location: Calgary
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01-24-2018, 10:44 AM | #12 |
NASIOC Vendor
Member#: 136396
Join Date: Jan 2007
Chapter/Region:
MWSOC
Location: Minneapolis, MN
Vehicle:2020 STI, 2022 WRX |
Hey, we had worked with you on this before, and now it looks like you've posted this on Rally Sport Direct looking for help. Rally Sport Simply redirects the question back to us, so even though we've been working on this through email again, I'll help you out here as well.
You have a TON of movement, more than I have ever seen. Just as Chuckable showed, that while the clearance between that crossmember and the j pipe is tight, it does not contact. I know your mechanic's theory of the drive shaft shifting and causing this, but did you have him check the condition or existence of your engine mounts? There were reports of early cars with missing nuts or not tightened engine mounts, as well as cars that have broken the pitch stop mount on the firewall. SOMETHING is allowing the engine and transmission to move a substantial amount when the car is put into reverse, and my initial thought would be that a mount is loose. Check those FIRST. I could especially see that is one was loose and the other wasn't, it would let the engine easily pivot in one direction, in this case when loaded in reverse. So check out all three mounts, and then report back. The amount of movement you have, and how easy it moves is not normal at all. Chase Engineering |
01-24-2018, 10:58 AM | #13 | |
Scooby Newbie
Member#: 461391
Join Date: Jan 2017
Location: Bay Area, CA
Vehicle:2017 WRX Base White |
Quote:
I wish I live close to your shop, then I can just drop it off and I can be worries free, LOL! |
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01-24-2018, 11:14 AM | #14 |
Scooby Specialist
Member#: 447566
Join Date: May 2016
Location: GA
Vehicle:2017 86 Black |
Grimmspeed customer service is always awesome
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01-25-2018, 10:51 AM | #15 | |
NASIOC Vendor
Member#: 136396
Join Date: Jan 2007
Chapter/Region:
MWSOC
Location: Minneapolis, MN
Vehicle:2020 STI, 2022 WRX |
Quote:
I think you're going to find that this one comes down to something strange. As I mentioned the amount of movement that you have under basically no load in reverse is substantial. If every car did that, everyone's exhaust (stock or not) would be bouncing off their chassis. Let me know what you find out, because chances are you might find an issue that could have potentially ended up as something more serious to the car, especially if an engine mount is missing a nut or something. Why thank you! We don't usually have too many problems, so something like this can easily stump the CS guys, especially when it looks like the issue probably has nothing to do with our hardware. Either way, we always try and figure it out. Chase Engineering |
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01-25-2018, 02:23 PM | #16 | |
Scooby Newbie
Member#: 461391
Join Date: Jan 2017
Location: Bay Area, CA
Vehicle:2017 WRX Base White |
Quote:
As stated from my OP, I love the GS product, power, and sound. That's why most of my mod parts are from you guys. Also to clarify of the videos, those were under load, (my mechanic was up in the car stepping on the brake and throttle with letting the clutch go, that's why you can see my car got stalled few times) Any way, I have scheduled with my mechanic sometime next week to take a look for each mount see if all the bolts are tighten. I have also recorded a video today for my engine start up and lightly moving around with the hoop up, seem like my engine vibrate is not a lot, also I have the Process West Verticooler (the top of the cooler is super close to the plastic) there no sign of any contact at all. Also I have checked the pitch stop, nothing look crack at all. Will post that video later today. By the way, here is a picture I took in other day while I was trying to figure out how to route the hoses of the AOS, so it shows my pitch stop and mounting is not bad at all. Last edited by MR2SW21; 01-25-2018 at 03:19 PM. |
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01-25-2018, 06:02 PM | #17 | |||
NASIOC Vendor
Member#: 136396
Join Date: Jan 2007
Chapter/Region:
MWSOC
Location: Minneapolis, MN
Vehicle:2020 STI, 2022 WRX |
Quote:
Quote:
Quote:
If no issues are found with the engine or transmission mounts, we can keep trying, but the main fact is that there are only so many mounting points for the entire exhaust system. regarding the J-pipe, it is the turbo, the transmission mount, and the catback. Assuming the catback is connected and using all 5 hangers, you can not remove any more movement than there is. Assuming everything is tight at the turbo, obviously the j pipe can not pivot, and assuming the bolt is tight at the transmission mount, it can only move so far as the engine and transmission mounts allow them to. This is how I came to the conclusion that I'm currently at. Assuming the fitment is spot on, which is appears to be, the only potential issue I can see would be with how much movement I can see in your videos. Particularly the second video, at like 0:08 you can see the transmission mount move up and down like an entire half inch or more. The movements are violent to say the least. We'll see what happens as we get further into it, but like I said: the fitment looks spot on, and we don't really have any reason to believe otherwise. The J-pipe can be adjusted out of the way with a combination of loosening and tightening the flange at the turbo, the transmission bracket (which you can also adjust at the transmission), and the junction at the catback, and I would do this again pending you don't find any issues with the mounts of the car. Chase Engineering |
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01-26-2018, 11:12 AM | #18 |
Scooby Specialist
Member#: 453427
Join Date: Aug 2016
Chapter/Region:
MWSOC
Location: Detroit, MI
Vehicle:2017 WRX Crystal White Pearl |
I just saw the videos and that definitely looks like a bolt is missing from the install or the transmission mount is gone.
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01-26-2018, 04:30 PM | #19 |
Scooby Newbie
Member#: 461391
Join Date: Jan 2017
Location: Bay Area, CA
Vehicle:2017 WRX Base White |
I captured a short clip this morning to see my engine and transmission's movement with forward and backward.
Compared with other clips on youtube, I don't really see mine has much difference than others. Anyhow, still waiting for next week to visit my mechanic to check the bolts out. In the mean while here is the clip. http://drive.google.com/open?id=1OC9...xvg_laST-cvj-L |
01-27-2018, 02:59 AM | #20 | |
Scooby Specialist
Member#: 141952
Join Date: Feb 2007
Chapter/Region:
MWSOC
Location: milwaukee'ish
Vehicle:2023 M340i |
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01-27-2018, 10:41 AM | #21 |
Scooby Newbie
Member#: 292133
Join Date: Aug 2011
Location: Iowa
Vehicle:2016 WRX LBP |
I have a16 WRX and when my shop here in Nebraska installed my GS j pipe to years ago it was binding the same way but only when shifting from high rpm. We looked it over and couldn't figure it out. Fast forward six months and I replaced trans (group n) and pitch stop (Perrin) mounts and the problem disappeared. Now over 330 tq and no issues. The factory trans mount is very very soft.
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01-28-2018, 12:02 AM | #22 |
Scooby Newbie
Member#: 461391
Join Date: Jan 2017
Location: Bay Area, CA
Vehicle:2017 WRX Base White |
I stopped by my buddy's house today we have check all the mounts' bolts, they are all there and we are pretty sure they are tight.
Since everyone recommended group N for my case, hope it won't be too bad for NVH, I have read a lot of other reviews seem pretty extreme and subjective when people start judging about vibration and noises. Will report back after installed. |
01-28-2018, 12:23 AM | #23 | |
Scooby Specialist
Member#: 141952
Join Date: Feb 2007
Chapter/Region:
MWSOC
Location: milwaukee'ish
Vehicle:2023 M340i |
Quote:
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01-28-2018, 12:52 AM | #24 | |
Scooby Newbie
Member#: 461391
Join Date: Jan 2017
Location: Bay Area, CA
Vehicle:2017 WRX Base White |
Quote:
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01-29-2018, 10:48 AM | #25 |
Scooby Newbie
Member#: 461391
Join Date: Jan 2017
Location: Bay Area, CA
Vehicle:2017 WRX Base White |
One thing that still concerns me though, since you guys mentioned my trans tailshaft moving quite large amount, is it normal?
I am little worry for just replacing the transmission mount (the trans force it the same) just now have the chassis to take the hit, something will need to give eventually. Am I just putting a bandage on top a bandage, instead of really "fixing" the real issue? |
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