Engine mount inserts ... don't !

[djw8282]

Hey JFP,

So when you say real time do you mean while driving? Anyway to monitor it with the Durametric while driving? What about the transmission mounts? Do they aid in retarding the timing? Any insight is much appreciated. Just trying to decide if I will keep the transmission mounts. I'm definitely taking the front mount out.

[JFP in PA]

Originally Posted by djw8282

Hey JFP,

So when you say real time do you mean while driving? Anyway to monitor it with the Durametric while driving? What about the transmission mounts? Do they aid in retarding the timing? Any insight is much appreciated. Just trying to decide if I will keep the transmission mounts. I'm definitely taking the front mount out.

In the Durametric system, you can see the amount of ignition timing; if vibrations triggered the knock sensors, the timing amount would suddenly step down until the vibrations fall off, then the timing would come back up in a step like function. You can set the Durametric system up to record the timing and take the car for a run.

Solid or near solid engine mounts can trigger this phenomenon, transmission mounts less so because they are further away from the sensors.

[maytag]

Yes, the durametric will allow you to monitor any systems while driving. I understand that there's also a utility to record a session, though I've never used that feature.

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[djw8282]

I've used the Durametric for other issues, but I'm not sure which feature to select for the knock.

My main concern is the transmission mounts. I want to know if they have an effect on the knock as well.

[maytag]

Well to be honest, I don't think that you can monitor the knock sensor directly. I think you'll be looking for the DME's RESPONSE to knock.

I'd watch for things like ignition angle, for instance.

JFP may know more.

I've used mine mainly for watching the o2 sensors and the fuel trims. (And cam deviation, etc).

To be honest though, I seriously, SERIOUSLY doubt that you're going to be able to demonstrate that the knock sensor is being triggered by the engine mount. I just don't believe it is, so I don't know how you'll demonstrate that it is.

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[djw8282]

I gotcha Maytag. I'm not sure what to think to be honest.

[Radman]

Are we talking the inserts or the replacement bushings they offer? My understanding is the replacement bushing largely feels like stock, maybe a little more stiff, but that the inserts drastically increase the stiffness. Is this correct?

[JFP in PA]

Race cars typically either remove the knock sensor or disable them as they serve no purpose on a race car; and quite often run an aftermarket computer as well. And race cars run either very hard or totally solid mounts as softer mounts actually consume some HP that would other wise be transmitted to the rear wheels. Racing is a totally 10 tenths world, were small differences add up to winning or losing.

Competition cars and street cars are two totally different worlds, and neither one tends to do well in the other's environment.

[djw8282]

Oh just want to piggy back off of what JFP said about softer mounts consume HP. That's why I changed my mounts so I can put the power down to the ground better. Honestly I'm not sure if I can feel a difference.

[10/10ths]

....just to tie a ribbon on this, a street car makes a lousy race car and a race car makes a lousy street car.

A lot of these aftermarket parts that people think will improve their street cars actually make things much, much worse on the street in the real world.

Now I’m done.

[JayG]

Originally Posted by 10/10ths

....just to tie a ribbon on this, a street car makes a lousy race car and a race car makes a lousy street car.

A lot of these aftermarket parts that people think will improve their street cars actually make things much, much worse on the street in the real world.

Now I’m done.

yup! Applies to aero as well. What you think looks good can reduce performance

[djw8282]

Originally Posted by 10/10ths

....just to tie a ribbon on this, a street car makes a lousy race car and a race car makes a lousy street car.

A lot of these aftermarket parts that people think will improve their street cars actually make things much, much worse on the street in the real world.

Now I’m done.

You live and learn..

[djw8282]

Question for those in the know...I was in the process of installing the OEM 987 part. The Porsche plastic wrapping had the latest part number of 987-375-023-05 but the part itself had the very first 987 part number of 987-375-123-02. Is the insert the new part number or is it just an old mount? I understand the latest version is more robust so I definitely want it. I did not buy this from a Porsche dealer so I'm thinking of returning this part. Thanks.

[djw8282]

If anyone is interested in the Poweflex engine mount insert, I will be putting it in the classifieds.

[Radman]

Originally Posted by djw8282

If anyone is interested in the Poweflex engine mount insert, I will be putting it in the classifieds.

Did you try it out? Too much vibration? I'm hoping to put mine in sometime in the next couple of weeks.

Also, black or yellow insert?

[Radman]

Just to update this thread, I installed the yellow Powerflex bushing into my car today replacing a worn mount that literally fell out when I removed it today. There may have been a small increase in vibration but if there was, it felt good, not bad because I absolutely loved every second I drove it today.

I can see how the inserts could cause problems, but the replacement engine mount bushing was a huge improvement for me. Lifetime warranty too. Just my .02 to add to the discussion.

[djw8282]

Originally Posted by Radman

Just to update this thread, I installed the yellow Powerflex bushing into my car today replacing a worn mount that literally fell out when I removed it today. There may have been a small increase in vibration but if there was, it felt good, not bad because I absolutely loved every second I drove it today.

I can see how the inserts could cause problems, but the replacement engine mount bushing was a huge improvement for me. Lifetime warranty too. Just my .02 to add to the discussion.

Glad it worked out for you Radman. That bushing has too much NVH right behind me for my taste. I don't feel that anymore. I also was concern with triggering knock sensors. Now there is some NVH from the Transmission mounts but I'm willing to live with it because there's zero axle hop. Come around a turn really hard and the rear end "dances" around instead of bouncing all over the place. All shifts are nice a crisp. You really feel the difference when you drive the car hard. I think I'm going to settle on the blue inserts for the Rennline tuneable mounts. I have the yellow ones installed now. The NVH is the same for both but the yellow feels a tad bit softer.

[Radman]

Originally Posted by djw8282

Glad it worked out for you Radman. That bushing has too much NVH right behind me for my taste. I don't feel that anymore. I also was concern with triggering knock sensors. Now there is some NVH from the Transmission mounts but I'm willing to live with it because there's zero axle hop. Come around a turn really hard and the rear end "dances" around instead of bouncing all over the place. All shifts are nice a crisp. You really feel the difference when you drive the car hard. I think I'm going to settle on the blue inserts for the Rennline tuneable mounts. I have the yellow ones installed now. The NVH is the same for both but the yellow feels a tad bit softer.

Wonder if the combo of trans mounts and the engine mount combined are too much. When I replace the trans mounts, I'll likely go stock.

[berni29]

Hi

I filled the lower voids of my (good condition) transmission mounts with polyurethane and it introduced a fair bit of NVH, nearly all of it at idle.

Berni