Boosted Twins and motor mounts

[nataku]

Originally Posted by OrbitalEllipses

Gotta disagree. Have you seen how much movement the engine has in the cradle in on/off throttle? Engine mounts are probably one of the best ways to improve driveline performance in on/off throttle and ensure that torque is going to the wheels instead of needless movement of the engine/trans assembly. You can literally feel the entire driveline moving during shifting and on/off throttle conditions.

That too. I remember a non-twin owner pointing out the engine wobble when I would hit redline free revs. You can see it in my dyno vids too when I was doing the stock baseline pulls.

[OrbitalEllipses]

Originally Posted by King Tut

I saw how much it could move when I installed my clutch, and I couldn't get the damn engine to stop moving so I could get the transmission to seat. I still prefer the less NVH approach of the OEM mounts on the street. I am not sure why we didn't get the rear dogbone mount that the WRX/STI have.

I wondered about the rear dogbone as well, but I never bothered upgrading mine on the WRX - Group-N engine mounts fixed all my concerns with no additional NVH outside of during cranking.

Originally Posted by nataku

That too. I remember a non-twin owner pointing out the engine wobble when I would hit redline free revs. You can see it in my dyno vids too when I was doing the stock baseline pulls.

Yup, you can clearly see it in my baseline dyno vid as well. @Mach V Dan even made a comment on it at the time, too.

[xxscaxx]

I'm debating on making the switch to some STi mounts in my Innovate equipped BRZ.

[PERRIN_Chris]

Originally Posted by Pete156

My Perrin mounts would not fit with the Perrin overpipe. I sent them back. After seeing these pics, I'm glad I stayed with stock.

Originally Posted by Sportsguy83

I think its safe to say over 90% of Perrin Engine Mounts customers and target market for them have an aftermarket header.

To extract the kind of power from the engine that merits upgrading mounts, one of the first steps is upgrading the stock header.

It is definetly possible to run the PERRIN engine mounts on a turbo or aftermarket header car. As long as there is proper airflow during dyno runs, with proper shielding, wrap, etc you will be fine. We've been selling these for a while, and I believe this is the first time I've heard of a melted mount!

[Sportsguy83]

Originally Posted by PERRIN_Chris

It is definetly possible to run the PERRIN engine mounts on a turbo or aftermarket header car. As long as there is proper airflow during dyno runs, with proper shielding, wrap, etc you will be fine. We've been selling these for a while, and I believe this is the first time I've heard of a melted mount!

I have them and will inspect them later on. I have been running with no tray under the engine since the new turbo kit got installed. This is just one more reason to not mount it

[evan]

I have the Perrin motor mounts, but will likely be going back to stock or going with different mounts.

Sent from my Nexus Five, I'm Alive!

[Sportsguy83]

Originally Posted by evan

I have the Perrin motor mounts, but will likely be going back to stock or going with different mounts.

Sent from my Nexus Five, I'm Alive!

I don't get why the drastic overreaction.....

It's one reported issue among a LOT of mounts sold....

Al least verify you have the problem before spending more money.

[tg_1981]

Originally Posted by PERRIN_Chris

That is not normal for sure, sending PM! Sorry for the hassle. I'm not sure how many customers of ours have turbo kits installed with our header, this is the first we've seen melt! It could be that it will need additional head shielding.

Chris thank you for taking care of the issue.

[evan]

Originally Posted by Sportsguy83

I don't get why the drastic overreaction.....

It's one reported issue among a LOT of mounts sold....

Al least verify you have the problem before spending more money.

Lol.

I do have a problem. I'm not a lemming.

I've noticed an annoying harmonic resonance from these mounts at highway speed on anything other than glass smooth roads. It could be due to also having the Perrin trans mount in combination. I don't know. Going back to stock mounts is a test to determine the true source of the resonance. It started right after I installed the Perrin motor mounts. I already had the Perrin trans mount in combination. I have many modifications, which I regret not doing in slow succession. It's hard to trace issues when too many things change.

From a dead stop launch, the mounts are doing their job no doubt.

I have little experience with imports. My prior experience has predominantly been on domestic platforms. On those platforms, I've experimented with solid mounts and the increased feedback through the chassis was welcome since it was mostly vibrational. I don't have a problem with a seat massage. This 'NVH' I'm getting from the poly-based Perrin's is more audible rather than vibrational. Combine with the lack of insulating material in the 86 and it gets old pretty quick.

Also, I don't always post my problems right away on the forum or any other. I don't want to be that guy. I tend to do a lot of troubleshooting before saying anything.

Sent from my Nexus Five, I'm Alive!

[xwd]

Just installed the Cusco mounts and they added a fair bit of NVH.

[Shit Luck]

cusco sitting in my garage waiting to go on

[xwd]

They definitely transmit more NVH than the ones on my WRX did. With a grabby clutch it would pretty brutal... Not an issue at highway speeds at all just low RPM starting and stopping and you feel it a bit at high RPMs through the pedal.

I put the Cusco mounts on along with a P&L header and Tomei front pipe, to go with my Perrin non-resonated catback. My wife says i ruined the car because it vibrates too much and sounds like shit.

Gonna have to get that resonated section for the Perrin.

[PERRIN_Chris]

Originally Posted by evan

Lol.

I do have a problem. I'm not a lemming.

I've noticed an annoying harmonic resonance from these mounts at highway speed on anything other than glass smooth roads. It could be due to also having the Perrin trans mount in combination. I don't know. Going back to stock mounts is a test to determine the true source of the resonance. It started right after I installed the Perrin motor mounts. I already had the Perrin trans mount in combination. I have many modifications, which I regret not doing in slow succession. It's hard to trace issues when too many things change.

From a dead stop launch, the mounts are doing their job no doubt.

I have little experience with imports. My prior experience has predominantly been on domestic platforms. On those platforms, I've experimented with solid mounts and the increased feedback through the chassis was welcome since it was mostly vibrational. I don't have a problem with a seat massage. This 'NVH' I'm getting from the poly-based Perrin's is more audible rather than vibrational. Combine with the lack of insulating material in the 86 and it gets old pretty quick.

Also, I don't always post my problems right away on the forum or any other. I don't want to be that guy. I tend to do a lot of troubleshooting before saying anything.

Sent from my Nexus Five, I'm Alive!

Sorry to hear about your mounts, from your experience, it sounds like keeping the stock mounts or using a softer upgraded mount would suit you better. Our mounts will add a noticeable difference in vibration and sound. Especially with other mods on your car which it sounds like you have, it could get pretty loud.

I know there's some customers though that have complete exhausts with a stiffer transmission mounts and our engine mounts that are fine though. It might be worth a shot checking the overpipe to make sure nothing's rubbing.

[evan]

Originally Posted by PERRIN_Chris

Sorry to hear about your mounts, from your experience, it sounds like keeping the stock mounts or using a softer upgraded mount would suit you better. Our mounts will add a noticeable difference in vibration and sound. Especially with other mods on your car which it sounds like you have, it could get pretty loud.

I know there's some customers though that have complete exhausts with a stiffer transmission mounts and our engine mounts that are fine though. It might be worth a shot checking the overpipe to make sure nothing's rubbing.

Chris.. I haven't yet written off the mounts since I haven't isolated the problem 100%. For all I know, it could be a wheel bearing that's toast. Everything is fine until I reach highway speeds on less than smooth roadway. I then hear this harmonic resonance. It's the best way to describe. It's not vibration coming through the steering wheel. I did recently do a compete overhaul of my exhaust from the header downpipe back, so any overpipe clearance issues should be addressed.

I'll see you at SyKart later. Maybe we can chat about it further then..

--
"wacks on..wax off"