subframe delrin vs solid alum

[steven_s]

So I've done the search and no one (vendors nor personal) has really answered this question. Well at least not that I've found.

For the subframe bushings is there a performance difference? I know the 2 piece delrin was to enter specific races with non-solid requirements.

The car in question will be

- tracked
- never will be fully gutted
- never will be supercharged

Anyone?

[roastbeef]

is this car your daily driver? i have solid sub, and derlin diff bushings. i enjoy them, but they magnify the clunky nature of the dct. i also have a one piece carbon driveshaft that makes it even more direct. car feels pretty raw, but i have to say i like it. the whine is noticeable with the windows up, but not noticeable with the windows down. i'd do this mod again if i crashed my car and bought another.

[Redd]

Solid subframe bushings add zero NVH

[steven_s]

Originally Posted by roastbeef

is this car your daily driver? i have solid sub, and derlin diff bushings. i enjoy them, but they magnify the clunky nature of the dct. i also have a one piece carbon driveshaft that makes it even more direct. car feels pretty raw, but i have to say i like it. the whine is noticeable with the windows up, but not noticeable with the windows down. i'd do this mod again if i crashed my car and bought another.

Thanks, as quoted below you subframe doesn't add NVH. It's the diff bushing (as well as the CF driveshaft) that added the NVH.

I have the solid diff on its way. I don't mind a little NVH.

My question is specifically regarding performance of the subframe bushing with regards to solid aluminum and the delrin one.

Does the delrin ever feel less "planted" and "connected" than the pure aluminum being 2 pieces whether as a daily or on the track. I'm not looking for hearsay or raw science being that delrin is not metal, expands more than alum, etc Looking for real world application with regards to our car.

[Redd]

I doubt there's anyone who's installed Delrin first and then removed it and installed solid. So will be hard to find someone who can tell you differences of both.

[roastbeef]

Originally Posted by steven_s

Thanks, as quoted below you subframe doesn't add NVH. It's the diff bushing (as well as the CF driveshaft) that added the NVH.

I have the solid diff on its way. I don't mind a little NVH.

My question is specifically regarding performance of the subframe bushing with regards to solid aluminum and the delrin one.

Does the delrin ever feel less "planted" and "connected" than the pure aluminum being 2 pieces whether as a daily or on the track. I'm not looking for hearsay or raw science being that delrin is not metal, expands more than alum, etc Looking for real world application with regards to our car.

i don't think it is going to matter to be honest with you. i don't have real world data, and i can't think of why someone would switch subframe bushings. i know someone swapped solid/derlin diff bushings, but thats it.

[dparm]

Look at it this way: BMW switched to solid mounts in the F-series M3 and it's not exactly like owners are complaining en masse about NVH.

[steven_s]

Yeah so maybe this got confusing somewhere lol

I currently still have my oem bushings.

For a fact I know subframe bushings are a positive game changer for our cars.

I have the opportunity to buy both. I can actually save almost a $100 buying delrin in this instance (whereas vendors have it the other way ie delrin costs more)

I want to know if there is a difference in performance. I'll gladly pay the extra $100 for solid aluminum if it yields better results and longer lasting.

[pbonsalb]

I doubt anyone other than a race car driver could notice the difference. 75D poly or Delrin is a major improvement and the 2 piece poly/plastic bushings are easier to install. I am very happy with the 75D poly that I installed and happy that I installed only 95A poly for the diff bushings since they still sing/whine a bit in the 65-75 mph range on the highway. But I’d rather have stiffer diff bushing than a broken diff bolt or broken diff cover or bent subframe - things that have happened to a few forum members.

[roastbeef]

Probably not a significant difference. I just went metal because why not have 100% metal? It's cool. Realistically, it probability doesn't matter.

[Redd]

Solid bushings won't wear. If you ever have to replace the Delrin ones, $100 won't be anywhere close to the labor charges you will incur. Just go solid. There is no downside.

[steven_s]

Originally Posted by Redd

Solid bushings won't wear. If you ever have to replace the Delrin ones, $100 won't be anywhere close to the labor charges you will incur. Just go solid. There is no downside.

Well... technically Delrin is not supposed to either.

[Hujan]

There's zero reason to avoid solid aluminum in the subframe. Going to more solid bushings in the subframe does not affect NVH. Even if it did, I can't imagine you'd gain anything by going with delrin over aluminum. Delrin is very hard stuff. Just go aluminum and don't look back.

[steven_s]

Well that's the thing. Delrin is there as an option for reasons. Now for me specifically my case to go delrin over the aluminum is to save $100. But that's if everything is the same. If aluminum is proven to last longer provide better feedback etc then I'll be glad to spend the extra 100.

[buddalun]

How about the Turner Aluminum and Delrin option:

https://www.turnermotorsport.com/p-1...e82-1m-e9x-m3/

[steven_s]

Lol that's the one in question. Their delrin and their aluminum ones.

[buddalun]

So you are comparing these:



With these:



I doubt you could feel any difference b/w the two. If you're not class limited like the Delrin/Aluminum are intended for, go solid and be done with it (and save $200).

[steven_s]

I get what everyone is saying and coming from.

But if it's identical no one wants to save $100 and go delrin? They're both considered solid bushings.

My scenario is different that going delrin is cheaper. Turner sells delrin more expensive.

$100 is $100...

[Redd]

Jayzus. Just buy the Delrin.

[spazzyfry123]

Originally Posted by Redd

Jayzus. Just buy the Delrin.

Delrin is great stuff. Will there be a potential maintenance concern later on down the line that would not have been apparent with true solid bushings, however? Save $100 now and spend xxx later to replace again. Of course, if we're talking 50 years from now the Delrin will start to show wear then moot point....

[atopa2002]

Remember ease of install too plays a roll , I went with AKG because of this fact and I was installing it myself .

[MTBislife]

If $100 is so important that you can't make a decision about bushings, I think you may have bought the wrong car.