Installed 27Won RMM today

EdwarDallas

Senior Member
First Name
Edward
Joined
Oct 22, 2019
Messages
144
Reaction score
64
Location
Dallas, Texas
Car(s)
2020 Civic Si Sedan, 2016 HRV MT-6, 2015 Civic Si Sedan, 2010 Civic Si Coupe, 2004 Civic Si (EP3) AKA The Black Egg
Country flag
I installed the 27Won RMM today in my 2020 Si Sedan at 2,266 miles.

I may have slightly over-torqued the bolts due to not having a torque wrench so I am hoping it will not crack (? -Has this happened to anyone??)

NVH was there, I am hoping it dies down with time.

The noise is loud in the cabin, but too low to record on my phone. It does sound like an amplified exhaust sound and the vibration seems to be from 2,300-3,500rpm or so.

Shifting feels more direct and overall driving feels more solid.

It is an easy install and a beautiful piece of kit.

My engine bay is otherwise stock, but I plan to install a PRL stage 1 intake tomorrow and a PRL Intercooler in the near future (Hot as Hell here in Texas in the Summer!!)

Edward

CF909171-03F9-43A8-BBC8-C7FDFEB7AA10.jpeg
Advertisement

 

joshhjackson2112

Senior Member
First Name
Josh
Joined
Jul 3, 2018
Messages
714
Reaction score
451
Location
Raleigh, North Carolina
Car(s)
18' SI
Country flag
NVH was there, I am hoping it dies down with time.
I promise you the vibrations will die down. It wont go away completely but will be tolerable. Some people will swear that I am just getting used to it but it is total BS. Do some fun driving here and there and it will loosen up. I am not sure about the cabin noise though because I installed my 27won RMM the same day as my MAP exhaust. I want to say it was super loud when I first installed everything but then that died down too.
 

JT Si

Senior Member
Joined
Mar 17, 2019
Messages
1,218
Reaction score
1,022
Location
Place
Car(s)
Car
Country flag
Did you cackle maniacally for the first 30 minutes you drove due to the increased NVH? I did. It gets better, but it's still too loud when it's cold and I wear musicians etymotic earplugs sometimes.
 

shibles

Senior Member
First Name
Seth
Joined
May 12, 2018
Messages
247
Reaction score
158
Location
Athens, GA
Car(s)
2018 Honda Civic Si Coupe
Vehicle Showcase
1
Country flag
I'd get under there and torque it right. Basically it shouldn't crack but if you care about longevity and peace of mind, it may crack after a long time and cause fatigue failure, so proper torquing is best.
 
OP
OP
EdwarDallas

EdwarDallas

Senior Member
First Name
Edward
Joined
Oct 22, 2019
Messages
144
Reaction score
64
Location
Dallas, Texas
Car(s)
2020 Civic Si Sedan, 2016 HRV MT-6, 2015 Civic Si Sedan, 2010 Civic Si Coupe, 2004 Civic Si (EP3) AKA The Black Egg
Country flag
I'd get under there and torque it right. Basically it shouldn't crack but if you care about longevity and peace of mind, it may crack after a long time and cause fatigue failure, so proper torquing is best.
I think you are right. I ordered a torque wrench today. I'd like to have some piece of mind. You can literally feel the the pulsing of the crank at idle

Edward
 

JT Si

Senior Member
Joined
Mar 17, 2019
Messages
1,218
Reaction score
1,022
Location
Place
Car(s)
Car
Country flag
I think you are right. I ordered a torque wrench today. I'd like to have some piece of mind. You can literally feel the the pulsing of the crank at idle

Edward
That's probably not your torque being too high. It's because the mount is insanely stiff.

I'm not saying you shouldn't ensure proper torque, but a set of these will help. I use them all the time.

51fCQpOlN1L.jpg
 

[email protected]

REDEFINE the Aftermarket
Elite Sponsor
First Name
Vincent
Joined
Nov 24, 2017
Messages
1,953
Reaction score
3,799
Location
Las Vegas, NV
Website
www.27won.com
Car(s)
19 Ruckus, 18 SI, 18 CTR, 14 Ridgeline
Vehicle Showcase
2
Country flag
Looking forward to an update after you have had a few months with it. :)
 
OP
OP
EdwarDallas

EdwarDallas

Senior Member
First Name
Edward
Joined
Oct 22, 2019
Messages
144
Reaction score
64
Location
Dallas, Texas
Car(s)
2020 Civic Si Sedan, 2016 HRV MT-6, 2015 Civic Si Sedan, 2010 Civic Si Coupe, 2004 Civic Si (EP3) AKA The Black Egg
Country flag
UPDATE:

At 3,066 miles I decided to take off the RMM and inspect it and then re-install it to the torque specs.

The outside of the compound on the side the bolt goes in had some "skin" or outer surface worn off-probably due to being over-torqued for the last 800 miles of city/ highway driving.

So I flipped it over when I re-installed it and torqued it to spec (60/65 rear).

The sound has reduced considerably over time and re-torquing to specs (less tight than it was before) did not see to reduce much of the NVH from before--it is still there and the vibration has gone down too. It is much more liveable in terms if the NVH which is much less now.

There will always be some drone-make the exhaust sound really deep and grunty.

I'm keeping it-you can really feel it's stabilizing affects at high excelleration!!

Attached are pics. I'm glad it never cracked. That is one really tough piece of aluminum!

0190B1CA-626C-44FA-ABEA-EBC51BFA05D0.jpeg


CDD39687-5CCD-4C19-86EB-FE03BCD5F6C0.jpeg


AF55E60E-5C92-49D3-A99B-B86264710EE5.jpeg


04F8100A-6C57-450D-A1C6-FCB63398539C.jpeg



Edward
 
Last edited:
Advertisement

 
Advertisement
Top