Polyurothane Motor Mounts

[SlowWhite]

After Dynoing this weekend I was watching the Video on Sunday.

And noticed something about motor mounts. And I really wish I could give you guys the video's.

Anyrate....

- I have video of John Lacroix Dynoing
- I have video of Andy Nash Dynoing

that I watched right after video of my car. And All I have to say is DAMN. Watching there motors flex under WOT, in comparison to mine was kind of nerve racking.

I run a complete set of Polyurothane Motor mounts on my car (all 4) and my motor is almost Rock Solid through out a WOT Run.

Compared to there stock motor mounts I was shocked to see how much there motors Move apon WOT, and when they let off.

anyways Just wanted to say that the amount of Motor Flex compared to mine is huge. And I was thinking it might be a reason both of you are having Tranny problems.... Not possitive if that's a cause but still I'm surprised you don't have to replace motor mounts ever Pull due to Rippage or something.

But really if you see the video's you'd probably say WOW as well.

[A//// Guy]

Yea but how is the vibration in the car? Anyone have opinions against teh poly?

[Raptor]

I have had mine for 2 years now and never had a complaint. After the first 10 minutes I stopped noticing any additional vibration.

[JET]

If you are worried about vibration, just do the front and back one. That is what I have in right now. That is the roll axis so it will prevent most of the roll from accel/decel.

[SlowWhite]

IMO you get used to the vibrations.


And I for one would rather deal with Vibrations then have to replace Tranny's, or anything else that might get have pressure put on it by the movement of the motor.


Really if I was able to post the video's - at least for me I was suprised to say the least. about how much the stock motor mounts flexed.

I seriously was thinking that there motors didn't even have a front or back motor mount. From the Video's Andy's motor looks to flex about 6"s.

anyways I'm not sure what kind of effect this might have but just thought I'd put this out there.

[MustGoFaster]

There isn't room for them to move much more than 3" or so. I have front and rear prothane mounts, noticed the car hooked up better.

[carltalon]

I have a full set of the prothane's. There we'll worth the added vibrations. I get no wheel hope in my FWD.

[Kracka]

When I installed my set of Prothanes the tranny shifted a lot smoother and quicker. The vibrations were pretty bad and got quite annoying, more-so in cold weather (wasn't as bad during the summer). If I were to do it again I would probably just do the front and back rather than all 4.

[TheBlizzard]

There is definetly more advantages to having them to not having them. I could really notice last year when driving Jets car. Even with it being crankwalked you could tell it shifted a lot better until WOT after the motor mounts were installed.

Another thing that should go hand in hand with motor mounts is some decent suspension. I notice at the track a lot of cars take off and the nose of the car lifts way up in there air and then comes back down inbetween shifts. Which I guess you could say the weight transfer might be good for traction but it seems like it would hurt shifting somewhat. Even just by the jerking up and down. The cars that seem to have consistant smooth one two shifts have stiffer suspension and less body travel.

What suspension is the best for traction/shifting for straight racing? Is there a inbetween setup thats the best of both worlds or do you have to lose something to gain something? Are there any supsension setups that work to help FWD traction?

CRAIG

[JET]

That shifting difference on my car came from just the front motor mount too. This year I did the back one too.

If you think about it, your motor moving around is just like you moving the cables, it is making them effectively longer or shorter.