FC3S_nataku

iTrader: (3)

hey im going to put a new motor in my 7 soon and i was wondering if i should get solid motor and tranny mounts? is it worth it? how much will i lose in ride comfort? thanks Gabe

ddub

I have them. Only difference I noticed was in 5th gear or above 55mph. You get some serious vibration at 55+ but I live with it.

BlaCkPlaGUE

If its a daily driver, and you want comfort, stick with the stock ones.

ddub

Eh, I think more people think it's a big deal than it really is. I daily drive mine, it's no big deal. If you do the majority of your daily driving in the city you'll never notice it. I never notice a difference until 55+ mph or 5th gear.

RotaryEvolution

iTrader: (30)

why not just get poly mounts?

they are a ton stiffer than the stock mounts and obviously not as stiff as solid mounts...

beamer242

yeah i have poly on my car and i love it the only vibration i get is between 1000 and 2000 rpms, and above 55mph. the only reason i get the vibration at 1000 to 2000 is cuz there is only 1000 miles on them and they havent broken in yet.

ps. i got mine from chris at banzai racing.......visit banzairacing.net and check them out.

ddub

I've heard of people still breaking poly ones at the drag strip, plus I got all my solid ones for WAY cheaper.

RotaryEvolution

iTrader: (30)

well, solid ones can rattle things to death which is why i try to stay away from them at least for daily driven cars, they would be fine for strip cars and for weekend warriors.

Impreza2RX7

the only vibration I noticed was through the pedals..

SmogSUX

iTrader: (12)

Why would anyone go solid if it vibrates so much?

Impreza2RX7

You dont have your drivetrain moving around as torque is applied, it stays in one straight line..

SmogSUX

iTrader: (12)

So solid is more for low speed courses?

trochoid

iTrader: (6)

By stiffening most anything in the car, the energy that was used to flex or twist, is now availalbe for the wheels. Doesn't make more hp, just puts it where we most want it.

Impreza2RX7

Solid is betetr, it just depends on how much NVH you can put up with..

RotaryEvolution

iTrader: (30)

NVH

*cringe*


i feel like i'm in school again....

ddub

Less torque loss to the tires and some people don't care. I don't use the freeway much so it doesn't bother me. Like I said I only get vibration above 55mph.

RotaryEvolution

iTrader: (30)

shouldn't lose any torque to the tires it just isn't as instantaneous because the drivetrain has to 'wind up', also helps prevent wheel-hop.

ddub

The wheel hop is more the solid differential mount from my experience than the motor/tranny.

Impreza2RX7

Well, with a solidly mounted drivetrain, shifting is also more precise since the drivetrain isnt shifting slightly

RotaryEvolution

iTrader: (30)

it does help though, but most of it is in the rear end.

BlueTII

There was only one instance of someone "breaking poly ones" at the track, and that individual didn't have any tranny mounts and he didn't actually break the mounts, only the bolts. These can easily be replaced.

buttsjim

As a compromise, how about the "engine torque brace" sold by Racing Beat? In effect, it accomplishes much the same as the solid mounts by bracing the motor against twisting from its torque. It has rubber bushings that you can adjust to help limit vibration. At about $70, it's not too expensive. On the downside, it adds clutter to the engine compartment, and it tends to get in the way when you work in the firewall area.

I'm not recommending this, I'm just throwing the idea out as a target for everyone to take pot shots at because I'd like to see your opinions.