Feels like motor is twisting? - Page 3

Medusa · 11-25-2009, 06:43 PM

Looking won't always tell you their condition. The best way to check them is to take them out and feel the play in them with your own two hands.

And my throttle doesn't feel very stiff. it's not like its really loose, it feels...just right I guess. It doesn't just sink to the floor when I barely step on it, but I don't have to seriously exert myself to press it down either.

Jason.MZW20 · 11-25-2009, 08:11 PM

Your mounts need to be replaced. Rubber may last 20 years, but its composition changes. The mounts have been hardening over time. The front mount is where most of the movement occurs, and I suppose Toyota designed it that way because my new OEM front mount broke itself free after replacing the other 3 mounts too, but because the rubber was softer, it actively reduced the shock load on the engine/chassis and my engine no longer clunked on acceleration and deceleration.

The side mounts are basically torque stays designed to reduce transient engine twist. The front and rear mounts take the beating.

como · 11-26-2009, 06:38 PM

I'm curious if anyone makes "softer" than stock mounts, or if there are ways to manage reducing vibration transferr further. It's a big problem in mine.

nitrofreak06 · 11-28-2009, 11:42 AM

I have more road noise from my tires than i do the motor i think. Wish my car was a little bit more quieter on the inside. But not much i can do really.

328FTW · 11-28-2009, 01:13 PM

Quote:

Originally Posted by como

I'm curious if anyone makes "softer" than stock mounts, or if there are ways to manage reducing vibration transferr further. It's a big problem in mine.

If you are the experimental type you could try the same setup as lexus did with the es300 they used really soft mounts and put a little damper (shock absorber basically) on the engine. I have one and it transmits nothing through although it's a smooth 6 not a screaming 4. Still you could make some real soft mounts and attach a damper to try it.......no idea if it would work though.

Medusa · 11-28-2009, 07:33 PM

Be a man and run solid metal motor mounts like racecars use.

como · 11-28-2009, 09:48 PM

Quote:

Originally Posted by Medusa

Be a man and run solid metal motor mounts like racecars use.

If I was driving a race car, or racing a street car, I might- I happen to do neither... I drive like an old man.

And I *am* the experimental type! yay!
When I get a garage (soon, hopefully... in the market for a house) I'll look into it.

Medusa · 11-29-2009, 05:08 PM

I'm 18 so some passenger compartment vibration doesn't bother me. But I can completely understand wanting to keep it as quiet as possible. My best guess would be to install fresh stock motor mounts and maybe add some sound insulation. When MKII MR2's first came out, they were praised for smoothness in the passenger compartment. This makes me doubt anything softer than stock mounts would be required.

But if you go for the shock absorber route, I would mount 2 shocks, on the front and rear mounts. Just make sure they have equal bump and rebound rates. I think this is a pretty cool idea, so best of luck!

como · 11-29-2009, 06:44 PM

I'm only 23

I think I'll probably stick with stock mounts, or custom mounts if anything... shock absorbers sound like a-lot of work.

What I really need to do is put a bunch of closed cell foam throughout the interior. The stock sound insulator that came with it doesn't seem to do squat (I've driven the car with nothing but a drivers seat and a steering wheel for interior, wasn't much louder)
and I added a bunch of this paint on deadener... Quietcar I think it was. Also doesn't seem to make a difference. But I've killed the engine while driving before, and road noise is definitely not my problem! She was nice and quiet with the engine off.

Medusa · 11-30-2009, 04:08 AM

The 5S-FE is known for being a buzz-bomb. I have no exhaust right now (just headers and cat, everything else is off), and it's not really any louder on the highway. Around town it is obviously noticeable louder, but I expected that.

nitrofreak06 · 11-30-2009, 09:41 PM

When i was working on the muffler for my 2, i didn't have one on mine either. It wasn't the noise that bothered me, but the way it sounded. At times it sounded like a little tractor or something, haha. Sporty car needs sporty sound, so i got the exhaust on quickly.

Medusa · 12-01-2009, 03:48 AM

I was actually surprised at how good it sounds. Mine actually has a nice throaty growl to it. It never whines or screams or anything. That's the only reason I didn't get a new exhaust right away.

nitrofreak06 · 12-02-2009, 08:50 PM

hey guys. today when i picked up my brother from school. on the way back to the house, i was in 2nd gear around 3500-4000rpm and i floored it. and it felt like the whole back shocks was fully decompressing or something. That is almost impossible because the shocks are super stiff. So the motor has to be torquing a whole lot. I really need to get a vid of it some how and show you fellas.. I'm assuming the motor mounts have gotten really soft.

Medusa · 12-02-2009, 10:16 PM

If it felt like the back end of the car squatted down, it probably did. A motor twisting in it's mounts feels completely different than acceleration-induced squat.

Many stiff shock are still pretty soft on low speed dampening. And 2nd gear provides a pretty significant torque multiplication. So even with stiff shocks, if you floored it while your engine while it's in the powerband (beginning around 4K RPM or so) while in second gear would cause some pretty good squatting.

nitrofreak06 · 12-03-2009, 07:29 AM

Oh ok, well that makes pretty good sense then.

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11-25-2009, 06:43 PM	#41 (permalink)
Medusa HAY GUISE! Join Date: Sep 2008 Location: Reno, NV Posts: 752 Thanks: 9 Thanked 18 Times in 17 Posts iTrader Rating: (0/0% )	Looking won't always tell you their condition. The best way to check them is to take them out and feel the play in them with your own two hands. And my throttle doesn't feel very stiff. it's not like its really loose, it feels...just right I guess. It doesn't just sink to the floor when I barely step on it, but I don't have to seriously exert myself to press it down either.

11-25-2009, 08:11 PM	#42 (permalink)
Jason.MZW20 Pig Snout Join Date: Jul 2006 Location: Victorville, CA Posts: 1,373 Thanks: 15 Thanked 111 Times in 102 Posts Blog Entries: 6 iTrader Rating: (2/100% )	Your mounts need to be replaced. Rubber may last 20 years, but its composition changes. The mounts have been hardening over time. The front mount is where most of the movement occurs, and I suppose Toyota designed it that way because my new OEM front mount broke itself free after replacing the other 3 mounts too, but because the rubber was softer, it actively reduced the shock load on the engine/chassis and my engine no longer clunked on acceleration and deceleration. The side mounts are basically torque stays designed to reduce transient engine twist. The front and rear mounts take the beating.

11-26-2009, 06:38 PM	#43 (permalink)
como Road Warrior Join Date: Jan 2009 Location: Southern Maine Posts: 652 Thanks: 13 Thanked 10 Times in 9 Posts iTrader Rating: (2/100% )	I'm curious if anyone makes "softer" than stock mounts, or if there are ways to manage reducing vibration transferr further. It's a big problem in mine.

11-28-2009, 11:42 AM	#44 (permalink)
nitrofreak06 Cage Fighter Join Date: Jan 2009 Posts: 235 Thanks: 2 Thanked 9 Times in 9 Posts iTrader Rating: (0/0% )	I have more road noise from my tires than i do the motor i think. Wish my car was a little bit more quieter on the inside. But not much i can do really.

11-28-2009, 07:33 PM	#46 (permalink)
Medusa HAY GUISE! Join Date: Sep 2008 Location: Reno, NV Posts: 752 Thanks: 9 Thanked 18 Times in 17 Posts iTrader Rating: (0/0% )	Be a man and run solid metal motor mounts like racecars use.

11-29-2009, 05:08 PM	#48 (permalink)
Medusa HAY GUISE! Join Date: Sep 2008 Location: Reno, NV Posts: 752 Thanks: 9 Thanked 18 Times in 17 Posts iTrader Rating: (0/0% )	I'm 18 so some passenger compartment vibration doesn't bother me. But I can completely understand wanting to keep it as quiet as possible. My best guess would be to install fresh stock motor mounts and maybe add some sound insulation. When MKII MR2's first came out, they were praised for smoothness in the passenger compartment. This makes me doubt anything softer than stock mounts would be required. But if you go for the shock absorber route, I would mount 2 shocks, on the front and rear mounts. Just make sure they have equal bump and rebound rates. I think this is a pretty cool idea, so best of luck!

11-29-2009, 06:44 PM	#49 (permalink)
como Road Warrior Join Date: Jan 2009 Location: Southern Maine Posts: 652 Thanks: 13 Thanked 10 Times in 9 Posts iTrader Rating: (2/100% )	I'm only 23 I think I'll probably stick with stock mounts, or custom mounts if anything... shock absorbers sound like a-lot of work. What I really need to do is put a bunch of closed cell foam throughout the interior. The stock sound insulator that came with it doesn't seem to do squat (I've driven the car with nothing but a drivers seat and a steering wheel for interior, wasn't much louder) and I added a bunch of this paint on deadener... Quietcar I think it was. Also doesn't seem to make a difference. But I've killed the engine while driving before, and road noise is definitely not my problem! She was nice and quiet with the engine off.

11-30-2009, 04:08 AM	#50 (permalink)
Medusa HAY GUISE! Join Date: Sep 2008 Location: Reno, NV Posts: 752 Thanks: 9 Thanked 18 Times in 17 Posts iTrader Rating: (0/0% )	The 5S-FE is known for being a buzz-bomb. I have no exhaust right now (just headers and cat, everything else is off), and it's not really any louder on the highway. Around town it is obviously noticeable louder, but I expected that.

11-30-2009, 09:41 PM	#51 (permalink)
nitrofreak06 Cage Fighter Join Date: Jan 2009 Posts: 235 Thanks: 2 Thanked 9 Times in 9 Posts iTrader Rating: (0/0% )	When i was working on the muffler for my 2, i didn't have one on mine either. It wasn't the noise that bothered me, but the way it sounded. At times it sounded like a little tractor or something, haha. Sporty car needs sporty sound, so i got the exhaust on quickly.

12-01-2009, 03:48 AM	#52 (permalink)
Medusa HAY GUISE! Join Date: Sep 2008 Location: Reno, NV Posts: 752 Thanks: 9 Thanked 18 Times in 17 Posts iTrader Rating: (0/0% )	I was actually surprised at how good it sounds. Mine actually has a nice throaty growl to it. It never whines or screams or anything. That's the only reason I didn't get a new exhaust right away.

12-02-2009, 08:50 PM	#53 (permalink)
nitrofreak06 Cage Fighter Join Date: Jan 2009 Posts: 235 Thanks: 2 Thanked 9 Times in 9 Posts iTrader Rating: (0/0% )	hey guys. today when i picked up my brother from school. on the way back to the house, i was in 2nd gear around 3500-4000rpm and i floored it. and it felt like the whole back shocks was fully decompressing or something. That is almost impossible because the shocks are super stiff. So the motor has to be torquing a whole lot. I really need to get a vid of it some how and show you fellas.. I'm assuming the motor mounts have gotten really soft.

12-02-2009, 10:16 PM	#54 (permalink)
Medusa HAY GUISE! Join Date: Sep 2008 Location: Reno, NV Posts: 752 Thanks: 9 Thanked 18 Times in 17 Posts iTrader Rating: (0/0% )	If it felt like the back end of the car squatted down, it probably did. A motor twisting in it's mounts feels completely different than acceleration-induced squat. Many stiff shock are still pretty soft on low speed dampening. And 2nd gear provides a pretty significant torque multiplication. So even with stiff shocks, if you floored it while your engine while it's in the powerband (beginning around 4K RPM or so) while in second gear would cause some pretty good squatting.

12-03-2009, 07:29 AM	#55 (permalink)
nitrofreak06 Cage Fighter Join Date: Jan 2009 Posts: 235 Thanks: 2 Thanked 9 Times in 9 Posts iTrader Rating: (0/0% )	Oh ok, well that makes pretty good sense then.