Poly, Delrin, or Billet mounts?
05-20-20, 07:13 PM
#1
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Poly, Delrin, or Billet mounts?
About to order some new mounts across the board, all mine are original., engines are completely shot.
What does everyone think about Poly vs Delrin vs Billet? Is Billet really that bad in terms of vibrations? Are the benefits of going completely solid going to outweigh the cons? Is the solid going to be that much better than say, Poly? Is Delrin the best middle ground.
I’m not at all averse to vibrations, I’d just like my car to not feel like it’s going to shake itself apart every time I drive.
What does everyone think about Poly vs Delrin vs Billet? Is Billet really that bad in terms of vibrations? Are the benefits of going completely solid going to outweigh the cons? Is the solid going to be that much better than say, Poly? Is Delrin the best middle ground.
I’m not at all averse to vibrations, I’d just like my car to not feel like it’s going to shake itself apart every time I drive.
05-20-20, 07:23 PM
#2
Originally Posted by lespaul166
About to order some new mounts across the board, all mine are original., engines are completely shot.
What does everyone think about Poly vs Delrin vs Billet? Is Billet really that bad in terms of vibrations? Are the benefits of going completely solid going to outweigh the cons? Is the solid going to be that much better than say, Poly? Is Delrin the best middle ground.
I’m not at all averse to vibrations, I’d just like my car to not feel like it’s going to shake itself apart every time I drive.
What does everyone think about Poly vs Delrin vs Billet? Is Billet really that bad in terms of vibrations? Are the benefits of going completely solid going to outweigh the cons? Is the solid going to be that much better than say, Poly? Is Delrin the best middle ground.
I’m not at all averse to vibrations, I’d just like my car to not feel like it’s going to shake itself apart every time I drive.
It depends on how soft you are. There are people that complain about poly; only an OEM rubber mount would satisfy. I personally have delrin and I absolutely hate it. I will probably switch to poly. Plus the mounts have compliance for a reason. You do want SOME give; delrin and aluminum really don't offer that.
05-20-20, 07:27 PM
#3
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Delrin is not a middle ground...it is considered a "solid" mount and is only slightly less harsh than aluminum.
It depends on how soft you are. There are people that complain about poly; only an OEM rubber mount would satisfy. I personally have delrin and I absolutely hate it. I will probably switch to poly. Plus the mounts have compliance for a reason. You do want SOME give; delrin and aluminum really don't offer that.
It depends on how soft you are. There are people that complain about poly; only an OEM rubber mount would satisfy. I personally have delrin and I absolutely hate it. I will probably switch to poly. Plus the mounts have compliance for a reason. You do want SOME give; delrin and aluminum really don't offer that.
05-20-20, 07:39 PM
#4
Have you considered the Mazdaspeed competition mounts? I would imagine fresh Mazdaspeed comp mounts (which are stiffer than stock) or a poly set would be a significant difference vs worn out 30 year old OEM mounts. Also your poly come in different durometer options as well, in case you weren't aware.
05-20-20, 07:44 PM
#5
Rotary Freak
I went to Poly mounts after that, and don't mind it too much. I can't even say I've put enough miles on them to break them in properly, since I started taking the car apart soon after they were installed. They definitely weren't as bad as Delrin, and definitely vibrated more than the stock rubber ones. There is a bit of vibration coming off of idle, otherwise they aren't bad. Once I get everything back together and put more miles on them I'll know whether I'm keeping them or buying stock mounts.
If you are okay with some vibrations but don't want to rattle your spine apart, I recommend Poly mounts.
05-21-20, 09:49 AM
#6
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i would do the Mazda comp mounts. they are 40% stiffer than stock, but the NVH is ok
i'm not a fan of solid mounts, we tried it in the race car, and the drive couldn't drive because he was seeing double and then the gas tank fell out. no benefits there...
i'm not a fan of solid mounts, we tried it in the race car, and the drive couldn't drive because he was seeing double and then the gas tank fell out. no benefits there...
05-21-20, 12:08 PM
#7
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I think im going to order Banzais Poly mounts in the Race variant. If I don't like them I can always switch to the street variant, But id assume that poly is significantly more than 40% stiffer?
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05-21-20, 12:11 PM
#8
Originally Posted by lespaul166
I think im going to order Banzais Poly mounts in the Race variant. If I don't like them I can always switch to the street variant, But id assume that poly is significantly more than 40% stiffer?
05-21-20, 12:24 PM
#9
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I wouldn't think so, seeing as how they sell a "Race to Street conversion kit" that just eliminates like a steel stiffener and adds and extra damper on the bottom of the mount?
05-21-20, 12:31 PM
#10
Originally Posted by lespaul166
I wouldn't think so, seeing as how they sell a "Race to Street conversion kit" that just eliminates like a steel stiffener and adds and extra damper on the bottom of the mount?
05-21-20, 01:53 PM
#11
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Quite frankly for morons who don't think about getting the hardest one and later going softer if they have to.
05-21-20, 06:48 PM
#12
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ive been meaning to make a little chart of the durometer of the competition mounts, its in the catalog. i'm not sure how it really works, is a 50 durometer rubber and 50 durometer poly the same?
05-25-20, 07:59 AM
#16
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Do the competition mounts require you to reuse anything from the stock setup? Looks like the original mounts had a separate metal "cup". Not cheap at $20 + tax each!
Attachment 740943
Attachment 740943
05-25-20, 07:59 AM
#17
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I just ordered a set of race grade Banzai motor mounts and a set of Mazda Comp tranny mounts, seeing how I was having a hard time finding readily available Poly trans mounts (that weren’t an EBay special). I’m sure between the two I’ll notice a fairly substantial benefit on the track.
does anyone have an opinion on the Mazda Comp Diff mounts? I know engine and trans are going to be the most significant in terms of wear and noticeable driveability, but is it worth the couple hundred or so for the Comp diff mounts? I’m sure mine aren’t in the best health but I’m sure they aren’t horrible...
does anyone have an opinion on the Mazda Comp Diff mounts? I know engine and trans are going to be the most significant in terms of wear and noticeable driveability, but is it worth the couple hundred or so for the Comp diff mounts? I’m sure mine aren’t in the best health but I’m sure they aren’t horrible...
05-25-20, 08:06 AM
#18
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does anyone have an opinion on the Mazda Comp Diff mounts? I know engine and trans are going to be the most significant in terms of wear and noticeable driveability, but is it worth the couple hundred or so for the Comp diff mounts? I’m sure mine aren’t in the best health but I’m sure they aren’t horrible...
05-25-20, 08:07 AM
#19
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05-25-20, 08:18 AM
#20
Originally Posted by j9fd3s
they replace the 39-040 exactly. why would you replace the metal cup? its a metal cup.
Originally Posted by j9fd3s
the comp diff mounts are great, it gets rid of the rubber bandy driveline slop. highly recommend. the front diff mount is the trouble spot
After a lot of research and consulting with one of the 2nd gen suspension "gurus" on this forum, I have a pile of parts waiting to add to the existing delrin upper diff mounts. The general consensus is the back end likes to be solid mounted. This add up quick though as you need to basically change everything on the backend to make this work properly, and of course introduces gear whine. If you haven't had a problem, then the comp mounts will probably suit you fine.
05-25-20, 08:28 AM
#21
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Because they're MIA. Likely went in the trash when the current junk delrin mounts went in.
Yes, the front mount is a problem...myself and many others have torn brand new comp front mounts fairly easily if you're in a turbo car making some decent power and aggressive takeoffs.
After a lot of research and consulting with one of the 2nd gen suspension "gurus" on this forum, I have a pile of parts waiting to add to the existing delrin upper diff mounts. The general consensus is the back end likes to be solid mounted. This add up quick though as you need to basically change everything on the backend to make this work properly, and of course introduces gear whine. If you haven't had a problem, then the comp mounts will probably suit you fine.
Yes, the front mount is a problem...myself and many others have torn brand new comp front mounts fairly easily if you're in a turbo car making some decent power and aggressive takeoffs.
After a lot of research and consulting with one of the 2nd gen suspension "gurus" on this forum, I have a pile of parts waiting to add to the existing delrin upper diff mounts. The general consensus is the back end likes to be solid mounted. This add up quick though as you need to basically change everything on the backend to make this work properly, and of course introduces gear whine. If you haven't had a problem, then the comp mounts will probably suit you fine.
05-25-20, 06:09 PM
#23
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05-27-20, 12:46 PM
#24
Back on topic, everyone knows about the AWR mounts, which are a unique design compared to the traditional "puck" mounts. But did anyone notice Xcessive released a similar design for the FC?
The AWR mount uses a single large diameter pair of bushings with new engine brackets, while the Xcessive uses dual smaller pairs and looks to use the factory engine brackets.
It seems AWR and Xcessive both offer these base designs for other chassis and just adapt them with a vehicle specific bracket. So not sure if one is better than the other.
AWR:
https://store.awrracing.com/engine-m...1992-urethane/
Xcessive:
https://xcessivemanufacturing.com/ma...fc-umm-s8.html
06-05-20, 07:08 PM
#25
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So I just wanted to provide an update, I installed the race poly mounts from Banzai racing today and for the most part they are absolutely brilliant. 2k-7.5K is flawless, almost no increase in vibration.
My only concern is that from 1.5-2k the car feels like it’s going to rattle itself apart. Violent shaking and shuttering, horrible noises. As soon as you cross the 2k threshold it’s perfect. But under that you better be ready for some very very severe shuddering and vibrations. Not so much at idle to be honest, only while accelerating or cruising in that 1.5-2k range.
has anyone else experienced this? Does it get better with time as the poly breaks in? Should I just go right for the street downgrade kit or should I give it time? Could the transmission torque mount from Racing Beat fix something like that? Looking for input. I absolutely love it 90% of the time but that 10% you’re taking off almost completely ruins the other 90%
My only concern is that from 1.5-2k the car feels like it’s going to rattle itself apart. Violent shaking and shuttering, horrible noises. As soon as you cross the 2k threshold it’s perfect. But under that you better be ready for some very very severe shuddering and vibrations. Not so much at idle to be honest, only while accelerating or cruising in that 1.5-2k range.
has anyone else experienced this? Does it get better with time as the poly breaks in? Should I just go right for the street downgrade kit or should I give it time? Could the transmission torque mount from Racing Beat fix something like that? Looking for input. I absolutely love it 90% of the time but that 10% you’re taking off almost completely ruins the other 90%