My quest to FI *56K no no*

[Mr.3000]

Originally Posted by BigTyla

I'm not a fan of solid motor mounts AT ALL. Very bad idea IMO, unless you want to risk extra stress and fatigue on your engine block.

I have KSport coilovers and 245/45/17 Khumo Ecsta ASX's. No traction problems here with a correct launch.

Why do you think that it is extra stress and fatigue. In laymens terms, F=mass*acceleration. If you don't have any acceleration, then you don't have much of a force. The rocking of the engine causes a bigger DT loss because you lose some of that rotational energy. Also, IMO, it will = less traction because that engine rotating is going to make your car squat on it's back wheels even more and thus, there is even less weight on your front tires. Don't get me wrong but my bro has poly mounts in his lude, there is something unnerving to me about watching and engine rock all about at startup.


Oh and btw John, I know how to use the SAFC2 but not profec B so maybe I can help lol.

[green-lantern]

Originally Posted by Mr.3000

Why do you think that it is extra stress and fatigue. In laymens terms, F=mass*acceleration. If you don't have any acceleration, then you don't have much of a force. The rocking of the engine causes a bigger DT loss because you lose some of that rotational energy. Also, IMO, it will = less traction because that engine rotating is going to make your car squat on it's back wheels even more and thus, there is even less weight on your front tires. Don't get me wrong but my bro has poly mounts in his lude, there is something unnerving to me about watching and engine rock all about at startup.


Oh and btw John, I know how to use the SAFC2 but not profec B so maybe I can help lol.

not to mention wheel hop will destroy a drive train.

[tabasco122]

Originally Posted by Mr.3000

Why do you think that it is extra stress and fatigue. In laymens terms, F=mass*acceleration. If you don't have any acceleration, then you don't have much of a force. The rocking of the engine causes a bigger DT loss because you lose some of that rotational energy. Also, IMO, it will = less traction because that engine rotating is going to make your car squat on it's back wheels even more and thus, there is even less weight on your front tires. Don't get me wrong but my bro has poly mounts in his lude, there is something unnerving to me about watching and engine rock all about at startup.


Oh and btw John, I know how to use the SAFC2 but not profec B so maybe I can help lol.

i think hes saying that if you have solid mounts (like maximal's, not polys) that if the frame rolls or flex's slightly, it stresses the engine because theres nothing to dampen that force with a completely solid mount.

[BigTyla]

Originally Posted by Mr.3000

Why do you think that it is extra stress and fatigue. In laymens terms, F=mass*acceleration. If you don't have any acceleration, then you don't have much of a force. The rocking of the engine causes a bigger DT loss because you lose some of that rotational energy. Also, IMO, it will = less traction because that engine rotating is going to make your car squat on it's back wheels even more and thus, there is even less weight on your front tires. Don't get me wrong but my bro has poly mounts in his lude, there is something unnerving to me about watching and engine rock all about at startup.


Oh and btw John, I know how to use the SAFC2 but not profec B so maybe I can help lol.

No offense, but you REALLY need to take some structural analysis classes before I can get into the reasons why solid mounts are bad. I'll try to explain anyway though. However, I never said anything about poly mounts though. They aren't nearly as bad as solids.

The defining principles of why I disapprove of solid mounts have to do with harmonics. The absence of a rubber or poly insert completely negates the system's ability to dampen a vibration, so the motor soaks all of this up instead of transferring it through the motor mount. It sort of goes along with the idea of a harmonic dampener on your crank pulley.

By adding a solid mount, the system is now completely overdampened. This is no good since there needs to be some time for decay so that the engine is not as likely to absorb these vibrations.

I really wish I could explain it better than that, but without you having some knowledge in vibrations and systems classes it's kind of a pain.

To start, read this:

http://en.wikipedia.org/wiki/Vibration

Also take note of this quotation which is 100% why I am against solid motor mounts as they cause these kinds of internal vibrations:

More often, vibration is undesirable, wasting energy and creating unwanted sound -- noise. For example, the vibrational motions of engines, electric motors, or any mechanical device in operation are typically unwanted. Such vibrations can be caused by imbalances in the rotating parts, uneven friction, the meshing of gear teeth, etc. Careful designs usually minimise unwanted vibrations.

[J-Groove]

I had to drive the car around, I mean she is just begging me to do so.

3 things happened while driving.

1: I felt AWESOME being back in my car, especially since I cleaned her up a little bit yesterday.

2: Around the neighborhood I drove past two different groups of kids, both times the kids yelled out nice car. One group with probably middle school kids, the other probably high school.

3: 4th gear popped out when I go on it!

At that point I turned off of the main road and into a neighborhood. I drive listening to the transmission, it sounded fine, I got back on the main road to get home, 1st, 2nd, and 3rd felt fine, 4th popped out.

Not violently, so I drove home in 3rd and got her into the garage. I went looking with a light, found that my intake pipe from my front turbo to the side mount was coming into contact with my shifter linkage when in 4th. Which I'm willing to bet once air passes gives just enough force to pop it out of gear.

I wont know for sure if that was it until I reroute the pipes, but it makes sense and I'm pretty sure that is the culprit.

-John

[green-lantern]

Originally Posted by J-Groove

I had to drive the car around, I mean she is just begging me to do so.

3 things happened while driving.

1: I felt AWESOME being back in my car, especially since I cleaned her up a little bit yesterday.

2: Around the neighborhood I drove past two different groups of kids, both times the kids yelled out nice car. One group with probably middle school kids, the other probably high school.

3: 4th gear popped out when I go on it!

At that point I turned off of the main road and into a neighborhood. I drive listening to the transmission, it sounded fine, I got back on the main road to get home, 1st, 2nd, and 3rd felt fine, 4th popped out.

Not violently, so I drove home in 3rd and got her into the garage. I went looking with a light, found that my intake pipe from my front turbo to the side mount was coming into contact with my shifter linkage when in 4th. Which I'm willing to bet once air passes gives just enough force to pop it out of gear.

I wont know for sure if that was it until I reroute the pipes, but it makes sense and I'm pretty sure that is the culprit.

-John

If it wasn't coming out of gear before then I am pretty confident you found your problem.

[defyboy]

Youll have to get a FMIC while ur re-routing the pipes :P

[NeoValentine]

Dyno it!

[J-Groove]

Originally Posted by defyboy

Youll have to get a FMIC while ur re-routing the pipes :P

Haha, my car mod money is already tapped for '08. But in '09, hell yeah.

Originally Posted by NeoValentine

Dyno it!

trust me, once she is tuned I will be. I want to know what she is safely capable of.

-John

[NeoValentine]

Can't wait to see your numbers..... and then beat them.