Troubleshooting help needed! Exhaust Install

[Esham]

Hey!

Just got done doing an exhaust system swap on my 2023 manual. I installed it myself and I haven't really installed an exhaust on a car before, and I just have basic experience with putting slip on exhausts on motorcycles. I THINK I have a problem with my install but its entirely possible what i am experiencing is normal for the exhaust i chose.

The problem:
I am getting a large amount of vibrations during revving, particularly during the 2.5k rpm range.

The context:
- The system i put on is the Boostlogic duel exit titanium with the valves.
- I am using a catless downpipe from Boostlogic (for the racetrack) Chose them instead of other DPs because I wanted to have the smallest chance of possible of mating issues between the downpipe and the midpipe because i have heard of people having issues with the stock DP mating)
- I am aware that a catless system is just overall going to be significantly louder. However since I have never done a setup like this before, it is unclear if excessive vibrations also come along with catless
- when putting together the system, i used the included grease that boostlogic provides for the joints, as well as tightened the band clamps for the joints with a hand socket wrench (wasnt trying to use excesive force but tried to ensure things were snug. No torque specs or documentation provided by boostlogic.)
- My car is using an OTS 91 octane map for California gas and high flow downpipes. It’s tuned with bm3

My observations and investigation thus far:
- The most problematic RPMs for vibrations are around 2.3k to 2.5k and then it comes back around 5k
- In between these RPMs, with the valves closed, the system sounds about as loud as OEM sport mode (reasonable given that its catless)
- During these RPMs, the vibrations will be so bad that it feels like it 2-3xs the "volume" of the sound
- Anecdotally, the sound seems like it is heavily biased towards the right side when sitting in the drivers seat (which is odd to me since i am closer to the left exit and I would expect them to be equally as loud if there wasnt an install problem)
- I have crawled under the car while the engine was running to confirm that both valves are actuating when switching modes
- I am using the new boostlogic valve springs that come pre-bent to the angle described in this article: https://www.boostlogic.com/supra-valve-spring-mod/
- both valve springs seem to be positioned correctly
- videos of similar setups do not appear to have the vibration from what i can tell and at least one owner has personally given his account that his is quiet with the valves closed. that being said it is hard to capture the vibration on video.
,

The question:
-Is this vibration typical for a catless setup?
-If there is potential for install issues, where should i check?
-Is there any type of minor body contact i should avoid or be wary of happening without me knowing?

Please provide any input you have. I dont need to live with this build being catless and i am happy to throw the cat back on if the vibration cant be remedied, however the resources ive looked at have led me to believe that this might be install related so was hoping to crowd source some ideas in parallel with me reaching out to boostlogic directly

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[itzTang]

Make sure valves are rattling
Make sure it’s not touching the under brace if not removed

 

[lucky phil]

Hey!

Just got done doing an exhaust system swap on my 2023 manual. I installed it myself and I haven't really installed an exhaust on a car before, and I just have basic experience with putting slip on exhausts on motorcycles. I THINK I have a problem with my install but its entirely possible what i am experiencing is normal for the exhaust i chose.

The problem:
I am getting a large amount of vibrations during revving, particularly during the 2.5k rpm range.

The context:
- The system i put on is the Boostlogic duel exit titanium with the valves.
- I am using a catless downpipe from Boostlogic (for the racetrack) Chose them instead of other DPs because I wanted to have the smallest chance of possible of mating issues between the downpipe and the midpipe because i have heard of people having issues with the stock DP mating)
- I am aware that a catless system is just overall going to be significantly louder. However since I have never done a setup like this before, it is unclear if excessive vibrations also come along with catless
- when putting together the system, i used the included grease that boostlogic provides for the joints, as well as tightened the band clamps for the joints with a hand socket wrench (wasnt trying to use excesive force but tried to ensure things were snug. No torque specs or documentation provided by boostlogic.)
- My car is using an OTS 91 octane map for California gas and high flow downpipes. It’s tuned with bm3

My observations and investigation thus far:
- The most problematic RPMs for vibrations are around 2.3k to 2.5k and then it comes back around 5k
- In between these RPMs, with the valves closed, the system sounds about as loud as OEM sport mode (reasonable given that its catless)
- During these RPMs, the vibrations will be so bad that it feels like it 2-3xs the "volume" of the sound
- Anecdotally, the sound seems like it is heavily biased towards the right side when sitting in the drivers seat (which is odd to me since i am closer to the left exit and I would expect them to be equally as loud if there wasnt an install problem)
- I have crawled under the car while the engine was running to confirm that both valves are actuating when switching modes
- I am using the new boostlogic valve springs that come pre-bent to the angle described in this article: https://www.boostlogic.com/supra-valve-spring-mod/
- both valve springs seem to be positioned correctly
- videos of similar setups do not appear to have the vibration from what i can tell and at least one owner has personally given his account that his is quiet with the valves closed. that being said it is hard to capture the vibration on video.
,

The question:
-Is this vibration typical for a catless setup?
-If there is potential for install issues, where should i check?
-Is there any type of minor body contact i should avoid or be wary of happening without me knowing?

Please provide any input you have. I dont need to live with this build being catless and i am happy to throw the cat back on if the vibration cant be remedied, however the resources ive looked at have led me to believe that this might be install related so was hoping to crowd source some ideas in parallel with me reaching out to boostlogic directly

Just get back under it and double check the exhaust clearances and clamp tensions to begin with.
Phil

 

[Esham]

Planning on getting back under it and triple checking the contact points. I can say though that a small thing I tried that I was surprised by is I was originally running without the trunk cover because I wanted to maximize trunk space, upon putting the trunk cover back on it removed the worst of the harshness.

Assuming I don’t find any bad contact the next time I am under the car, I think the simple answer might be that the harmonics of this exhaust system weren’t really designed with having the trunk cover off in mind. The fact that putting in this cover helped so much, to me indicates this might be less of a physical contact thing and more of an acoustic tuning thing of the cabin thing. Will let you know if I find anything else.

 

[Esham]

Climbed under the car, noticed a few things but not sure if I really found a main cause. As far as components contacting the body goes, the only thing that looked like it might be doing so is that I saw that the downpipe’s flexible area was contacting a piece of metal attached to the transmission. That being said. This is the same piece of metal that the 2 bolt bracket for the downpipe hangs off, and I am not convinced that it touching is delivering any more vibrations then it would already get through the bracket.

that being said though, I did realize that the tail section of the system was sitting a good deal farther back then it needed to be and it was slightly skewed in one direction. Before I tightened over thing back up I pushed the tail section into the pipes it connects to as strongly as I could and removed a good deal of slack from the setup. Did this help my fitment? Oh ya. Will this help my resonance problem at all? I doubt it, but we’ll see when I test her again.

 

[Strat-Supra]

Make sure it's not too close to the heat shield material. you should be able to put your fingers between the heat shield and the exhaust. if you can't in spots either readjust the exhaust alignment or slightly push on heat shield so you can get the room. Exhausts expand and move around a little bit.

You can also check the pipes to see if there's any marks from it rubbing.

 

[Esham]

Some long overdue updates:

- I discovered that one of my valves was seated improperly and the spring was getting seized against the actuator housing. This is what caused the right bias in the sound and the weird resonance. Properly seating the valve massivly improved interior accoustics

- I am dealing with some remaining valve vibrations, particularly on cold start. They are not able to be heard from the interior and this is mainly something i want to resolve so it sounds less janky from the exterior with the valves closed. This is a work in progress, but my testing leads me to believe that the pre-bent springs in got from boostlogic were not applying enough pressure and i needed to bend them further. Related reading:
https://www.boostlogic.com/supra-va... of our titanium,pressure on the valve itself.


Mostly wanted to document this due to the lack of troubleshooting information on this exhaust system so if somebody like me is bashing their head against the wall they at least have one more resource.

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