Am I "missing out" by not upgrading to solid subframe bushings?

[slonik]

Originally Posted by azndrunk74

very cool. does the two piece design shift at all? any drawbacks to a 1 piece? also, please PM me a price shipped to the US

no drawbacks to 1 piece).

I suspect you still have to press them in... just from both sides as opposed to one side. Might not be much easier.

i'm working with cars myself,not sitting in the office and watching thru large window, so i can really compare which easier

we make less preload on our bushings, because subframe clamping between 2 pieces and could not move when bolt tightened. you can easily insert them with light strokes of hammer.

in one piece design you need to have really good preload (so needs a lot force for pressing bushings to subframe), to have good fixing of subframe, other way if preload will not sufficient, subframe can shifts on bushings.

[D1ESEL]

Just ordered MRF Engineering Subframe Bushings and Turner Delrin Diff bushings.

Malek also has me talked into doing a CF driveshaft. I will probably order through VAC tomorrow.

[pbonsalb]

If VAC is using Driveshaft Shop, I would be concerned about vibration. DSS eliminates the guibo.

[SYT_Shadow]

Originally Posted by pbonsalb

If VAC is using Driveshaft Shop, I would be concerned about vibration. DSS eliminates the guibo.

If VAC is selling gummy bears I'd be concerned as well

[D1ESEL]

Originally Posted by pbonsalb

If VAC is using Driveshaft Shop, I would be concerned about vibration. DSS eliminates the guibo.

Originally Posted by SYT_Shadow

If VAC is selling gummy bears I'd be concerned as well

I talked with Malek and he spoke highly of their quality in the driveshaft they offer. I will talk to them and M Factory and figure out who can offer the best price/service.

[pbonsalb]

MFactory is not in production. They did make good shafts. I have one. I actually bought it from VAC (the place MFactory got theirs from was selling to other shops, which led to a legal dispute that stopped production for everyone). Hopefully they will find another maker or buy the equipment to make their own. But NLA at present, which is why I commented that you should make sure VAC does not supply you with a DSS shaft.

[Bartledoo]

Originally Posted by SYT_Shadow

If VAC is selling gummy bears I'd be concerned as well

Unless they are just rebadged haribos...golden bears...

[MPG_LOL]

i'm on 100% stock suspension except for solid rear subframe mounts. Compared to before, the car hooks up much better off the line. There's more traction and wheel hop has been nearly eliminated in most conditions.

Also, I'm 6MT and aggressive shifts feel more "direct" with the solid subframe bushings.

If you like occasionally launch your car and drive aggressively with a manual then you will feel the difference. If you are DCT I'm not sure the benefits will be felt as clearly other than reduced wheel hop on a launch

[pbonsalb]

If you want to do a lot of drag racing off the line, I would add stiffer diff bushings as well as subframe. There are a few reports of broken bolts and damage to the diff cover and subframe. There are 2 front and 1 rear bushing for the diff.

[Obioban]

Originally Posted by pbonsalb

If you want to do a lot of drag racing off the line, I would add stiffer diff bushings as well as subframe. There are a few reports of broken bolts and damage to the diff cover and subframe. There are 2 front and 1 rear bushing for the diff.

Yeah, but stiff diff mounts come with a HUGE NHV penalty.

[roastbeef]

Originally Posted by MPG_LOL

If you are DCT I'm not sure the benefits will be felt as clearly other than reduced wheel hop on a launch

the benefit is huge. very direct and feels solid. especially with a one piece driveshaft. response feels very good.

[pbonsalb]

Originally Posted by Obioban

Yeah, but stiff diff mounts come with a HUGE NHV penalty.

NVH depends on how stiff they are. I have driven an E93M3 with solid diff mounts and my E90M3 has AKG 95A poly diff mounts. On both cars, there is a light audible whine at some speeds. On my car, I can hear it sometimes but do not find it objectionable. E93 has more noise but also more sound deadening so the best choice for it may be different. I chose 95A as a conservative choice. I have an E36M3 with one solid mount and two 75D mounts and it sings obnoxiously at some speeds. I did not want that. I also did not want to risk breaking my subframecor diff Dover as a few have done due to excess diff movement.

[slicer]

Originally Posted by Obioban

Yeah, but stiff diff mounts come with a HUGE NHV penalty.

Originally Posted by pbonsalb

NVH depends on how stiff they are. I have driven an E93M3 with solid diff mounts and my E90M3 has AKG 95A poly diff mounts. On both cars, there is a light audible whine at some speeds. On my car, I can hear it sometimes but do not find it objectionable. E93 has more noise but also more sound deadening so the best choice for it may be different. I chose 95A as a conservative choice. I have an E36M3 with one solid mount and two 75D mounts and it sings obnoxiously at some speeds. I did not want that. I also did not want to risk breaking my subframecor diff Dover as a few have done due to excess diff movement.

+1. I have had delrin and now powerflex purple diff bushings on my e92. AKG red on e46 iirc. I have also driven e92's with solid diff bushings. Diff whine is increased but it's far from "huge". I somewhat regret not going with delrin or solid on my e92 this time.

[pbonsalb]

Purple is 80A and soft enough that it is only a little stiffer than stock. I think 95A is a good choice. There is also a vibration damper from another application that may help. It is mentioned in some posts by Malek. Might be from a 135i. I recall seeing a damper like thing that screwed into the front of an E36 diff but never knew it’s purpose.

[Longboarder]

Couple years back when I did mine on my old 2013, car launched out of the hole like a rocket. I did the MRF subframe bushings only not the diff.

At an airstrip event on a pretty bad surface for launching IIRC I was on Pilot Super Sports was doing 0-60mph in mid to high 3 seconds and out launched an R8v10 and other stuff like that. Def going to do it again when my 2012 arrives even tho I'll be keeping this one NA.

[roastbeef]

Originally Posted by Longboarder

Couple years back when I did mine on my old 2013, car launched out of the hole like a rocket. I did the MRF subframe bushings only not the diff.

At an airstrip event on a pretty bad surface for launching IIRC I was on Pilot Super Sports was doing 0-60mph in mid to high 3 seconds and out launched an R8v10 and other stuff like that. Def going to do it again when my 2012 arrives even tho I'll be keeping this one NA.

If you want to see how a car feels with solid/derlin bushings and a carbon driveshaft feels like I'd let you drive my car. I know you wouldn't break it.

[Longboarder]

Originally Posted by roastbeef

If you want to see how a car feels with solid/derlin bushings and a carbon driveshaft feels like I'd let you drive my car. I know you wouldn't break it.

You have the solid diff bushings also? Heard there is some NVH on a DCT car. I'd love to hear what it's like in your car.

[roastbeef]

Originally Posted by Longboarder

You have the solid diff bushings also? Heard there is some NVH on a DCT car. I'd love to hear what it's like in your car.

i have the MRF solid subframe bushings, turner derlin bushings, and Mfactory carbon one piece driveshaft. i'll be out of town this weekend, so next week should be better.
the driveshaft doesn't really make any more noise, but it enhances the direct feel of the bushings. it sort of magnifies that feeling of rigidity you get with the bushings. i mention it because it is very enjoyable to me. we'll have to go for a drive.

[Redd]

Sorry to go off topic, but +1 for the MFactory CF DS. Zero NVH, in fact it got rid of the notorious M clunk. And I'm seeing around 10% improved fuel consumption, too!

[pbonsalb]

I have it and no change in mpg nor would I expect any. But it does change the clunking. It’s still there but a different clunk.

[AWDBooSTIn90]

Originally Posted by slonik

i thought that 300$ for this work here in russia is not cheap


anyway, we make this lightweight set

Pme me prices

[cmontym3]

Originally Posted by roastbeef

i have the MRF solid subframe bushings, turner derlin bushings, and Mfactory carbon one piece driveshaft. i'll be out of town this weekend, so next week should be better.
the driveshaft doesn't really make any more noise, but it enhances the direct feel of the bushings. it sort of magnifies that feeling of rigidity you get with the bushings. i mention it because it is very enjoyable to me. we'll have to go for a drive.

I see Turner has two sets that say Delrin diff bushings, one is $199, the other is $239, which one should I get? Also would you recommend doing engine or trans mounts or anything else? Mine is 6mt