GTM S/C Stage 2 after installation problem
 

I have finished installation of GTM SC Stage 2 KIT in my Infiniti M37S. I have driven my first short ride. I have noticed that car is inside much louder that before installation when engine is idle. Additionally I feel vibrations on steering wheel and my seat when engine is idle. It is very annoying - now I feel like I have diesel engine in my car.

Is it normal due to changed the engine mount on the passenger side or I have something wrong installed?

Do you have any idea what I should check first?

Did you feel any difference in loudness or vibration on idle after SC installation?

Not sure about vibration but for loudness please dont tell me you want a fast car but quiet car.

its like saying a beast with pussycat voice

the additional noise and vibration when idle is very normal. I just installed stg 1.5 on my nismo and it feels exactly like you described, congrats!

poly mounts do tend to transfer more vibrations because they are stiffer.

It's the mount for sure. Take your panties off and enjoy it. That's boosted for you. In a couple days you'll forget it.

The car turns into a total monster after the s\c installation especially with exhaust and test pipes.

PS. Make sure to data log your afr correction as per instructions to make sure the tune is correct.

pozdro

Guys, thank you very much for your comments. I realize that fast car should be loud. I have Toyota Supra MK3 too and it is fast and loud and I love it (she) for it :)

M37 is my (any my family) DD car and I'm afraid of it reliability. In other hand my wife do not realize I do that modification :) On hearing strange noise after SC installation I was afraid to drive it harder. I'm still afraid on 7AT reliability, so I will have installed transmission cooling this week. I'm would have to up pressure line too using Osiris but I'm not sure to find someone in Poland to do this.

In Poland I'm first who install SC in Infiniti car. I don't have someone to verify my car, so I'm counting on your help.

I have AFR correction between 80% and 120% on low load and more less 100% when engine is over 3500 RPM.

pozdro :)

Get the logs as what is told by the instructions and send it to GTM. Chances are you will either need to recheck installations, or they'll send you a modified tune.

All you have to do is put the stock drivers side motor mount back in and the problem is solved.

There is no enough space to back to stock engine mount - stock mount is in the same place as supercharger.

I made two videos how my engine woks on idle.

Infiniti M37S GTM Supercharger Stage 2 - YouTube
Infiniti M37S GTM Supercharger Stage 2 - YouTube

There is strange repeated noise from belt. Could it have some influence on vibrations felt inside?

The drivers side mount,I replaced mine with the stock one and the vibrations are gone.

On drivers side I have the stock mount - I've replaced the mount only on passenger side - it is a part of the KIT.

My idle RPM is 680-725.

I know I have the same kit,I was making sure you did that.

The noise that you hear from the belt is the white lettering/label on the actual belt. If you look closely at the belt, the noise happens when the label goes over the pulleys. Sounds something like this right?, tick.. tick.. tick.. tick