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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 11-19-2019, 06:07 PM   #15
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I just confused when it said Sti vs Group N mounts. That's why thought these engine mounts were just sti and not group n.

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I bought the STI Group N mounts as per the links above. I think there is a difference between 'normal' STI and Group N STI. I moved from the OEM mounts to the Group N the change was pretty dramatic, the sloppy take up when changing gear has been banished..
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Old 11-19-2019, 06:25 PM   #16
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https://www.fastwrx.com/products/sti...5-wrx-2013-brz

These??

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Old 11-19-2019, 06:29 PM   #17
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https://www.fastwrx.com/products/sti...5-wrx-2013-brz

These??

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Yes, same ones me thinks. I ordered my set through a UK supplier, very good mod. The car drives much better as the mass of the engine and transmission is better locked in..
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Old 11-19-2019, 06:35 PM   #18
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Originally Posted by DarkPira7e View Post
Where are you finding a different durometer rating for the STI Group N mounts on our platform? I know on other Subaru chassis this is true, but for ours there seems to be no difference. I'm not being argumentative, I'm just hoping you're right.
Looks like the Group N ones have the same part numbers as the STI ones

https://sprintingharejdm.co.uk/ST410...20ST41022AS010 (Group N)

https://www.rallysportdirect.com/par...unt-right-side (STI)
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Old 11-19-2019, 08:53 PM   #19
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UPDATE: okay after a long drive, I can confidently say the crazy knocking sound is caused by the rough cold idle. Once the engine is hot, there are no crazy noises, even at idle. The only problem so far is a nasty gurgling rasp that is noticeable on acceleration, especially from 3K rpm onwards, but that may be due to the trans support, as it seems to come from directly below the trans tunnel. I put my back seats up and that helped the noise and I have to say, noises aside, the effect is very nice.

All those noises that we get new threads on from new owners once in a while with the title "does this sound normal?" are now amplified so the car sounds very much like a racecar. There is a bit of shudder on takeoff, but once warmed up, there is only a small increase in silent vibration felt at the pedals.

Go for them if on the fence, just keep in mind they're not as quiet as some reviews made them out to be. Then again, these are the new updated mounts so who knows if the change made them stiffer. Also, my combination of mods could be exacerbating the effects.

As for why the racket is so unbearable when the engine is cold, I've read on this website posts from other users saying that the engine runs rich when cold, which could be contributing to the rough idle, causing all kinds of clattery when the mounts are introduced. Whether a tune and/or Fluidampr might mitigate this are both options I'm willing to explore.

Thanks for the replies!
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Old 11-19-2019, 08:57 PM   #20
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I think a fluidamper would be good help. Even if you're going FI later it was be a nice upgrade as well.

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Old 11-19-2019, 09:04 PM   #21
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I think a fluidamper would be good help. Even if you're going FI later it was be a nice upgrade as well.

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That is the plan, which the new mounts are a part of!
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Old 11-19-2019, 09:21 PM   #22
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That is the plan, which the new mounts are a part of!
The new perrin or group n. Which ever is cheaper. I might as well get it in before FI.

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Old 11-20-2019, 08:56 PM   #23
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What's different between the old and new Perrin mounts? I have the original ones and other than idle being rougher, once the rev's climb everything is better and the car actually rides smoother over impacts. I went ahead and made heat shields for mine from header wrap and aluminum tape when I installed them and they have been holding up very well over the years.

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Old 11-20-2019, 09:54 PM   #24
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What's different between the old and new Perrin mounts? I have the original ones and other than idle being rougher, once the rev's climb everything is better and the car actually rides smoother over impacts. I went ahead and made heat shields for mine from header wrap and aluminum tape when I installed them and they have been holding up very well over the years.
I havenít looked into it tbh. Iím guessing they addressed the durability concerns. I absolutely love them btw. The car just absolutely rips now. Redlining is a joy
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Old 11-20-2019, 10:19 PM   #25
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What's different between the old and new Perrin mounts? I have the original ones and other than idle being rougher, once the rev's climb everything is better and the car actually rides smoother over impacts. I went ahead and made heat shields for mine from header wrap and aluminum tape when I installed them and they have been holding up very well over the years.

Slide me that shifter bruh... lol. Man that thing is sexy

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Old 11-20-2019, 10:25 PM   #26
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I haven’t looked into it tbh. I’m guessing they addressed the durability concerns. I absolutely love them btw. The car just absolutely rips now. Redlining is a joy
Visited the Perrin site and saw the difference... new ones are nicer, better done with a split through bushing design and all Perrin designed parts versus Perrin base for an Energy Suspension or whomever mount. Cheaper too!
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Old 11-20-2019, 10:36 PM   #27
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Slide me that shifter bruh... lol. Man that thing is sexy

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Been out of my car for years, dissassembled and sitting in a box in my closet... sheared the rod pin off the linkage rod because of improper tolerance. Had planned to custom redo the OME linkage with proper toleranced rod filled and bushing'd to the shifter lever but never got around to it...the sheared pin is still stuck in the shift lever as well. If you don't mind DIY to get it working I'd let you have it for 1/4 of its original price. Also have my modded original center console that would fit it so you don't have to hack up the stock one.
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