Lozer Posted April 26, 2017 Report Share Posted April 26, 2017 I'm about to order some rear bushing and I'm on the fence on which way to go. The car is mainly street but is used for autox. How noisy are the solid bushings? Quote Link to comment
flatcat19 Posted April 26, 2017 Report Share Posted April 26, 2017 Both your options will be noisy. And both will create a real ridged drive. Poly will be the least harsh...But still annoying. Quote Link to comment
datzenmike Posted April 26, 2017 Report Share Posted April 26, 2017 Rubber is best. It's why car makers use it. Quote Link to comment
q-tip Posted April 26, 2017 Report Share Posted April 26, 2017 Solid will be really harsh on the street, shit poly is going to be pretty bad too. If the noise and vibration isn't a big deal I would still go poly over solid, save yourself some agony. Quote Link to comment
datzenmike Posted April 26, 2017 Report Share Posted April 26, 2017 I don't know why people still continue to use poly. Maybe the rubber ones are not available? This is another 'racing' innovation that does not translate well for the street. You will have to drive the car harder than what's allowed on the street to notice anything. Rubber grips both moving parts, twists internally and has superior vibration/noise isolation. Poly is too stiff and one part slips leading to wear and noise. Polly needs maintenance like regular replacement (racing) or lubrication. 1 Quote Link to comment
hobospyder Posted April 26, 2017 Report Share Posted April 26, 2017 Because they're readily available. It's easier to find the poly than it is to find rubber stateside for me. But I'm probably doing something wrong not wanting to wait on shipping from Thailand when I can have it brought up the i5 corridor so much cheaper and quicker. Quote Link to comment
DISLEXICDIME Posted April 26, 2017 Report Share Posted April 26, 2017 I run aluminum i don't mind it Quote Link to comment
shacks510 Posted April 26, 2017 Report Share Posted April 26, 2017 Run dual side drafts to cover the noise. 2 Quote Link to comment
paradime Posted April 26, 2017 Report Share Posted April 26, 2017 How much HP are we talking though? Rubber bushings are designed for a 97hp engine. I have poly and ball joints all through my street/auto-x toy 510 and I can tell you, it's damn noisy, but if it's about performance, who gives a damn about noisy? 1 Quote Link to comment
KoHeartsGPA Posted April 26, 2017 Report Share Posted April 26, 2017 I'm with Paradime, if you're running auto X and don't mind noise, poly. Quote Link to comment
Icehouse Posted April 27, 2017 Report Share Posted April 27, 2017 Who sells solid bushing? I want them!!! Quote Link to comment
datzenmike Posted April 27, 2017 Report Share Posted April 27, 2017 How much HP are we talking though? Rubber bushings are designed for a 97hp engine. I have poly and ball joints all through my street/auto-x toy 510 and I can tell you, it's damn noisy, but if it's about performance, who gives a damn about noisy? Exactly! From a strictly purpose built car for racing (or equivalent) you don't need rubber, you could make them out of aluminum if you want, but for this, noise transmission and vibration are secondary to handling... probably closer to tertiary. In that venue, they are inspected and replaced regularly. If you choose to run them on the street, expect noise, vibration and early wear. I imagine the GTR uses rubber bushings. It has nothing to do with HP numbers. No one wants to spend that much money on a noisy squeaky ride with lots of vibration transmission.. Quote Link to comment
DISLEXICDIME Posted April 27, 2017 Report Share Posted April 27, 2017 Who sells solid bushing? I want them!!! http://www.dpracing.co/datsun-510-rear-suspension-1 2 Quote Link to comment
q-tip Posted April 27, 2017 Report Share Posted April 27, 2017 http://www.dpracing.co/datsun-510-rear-suspension-1 They do lots of good bits. Quote Link to comment
q-tip Posted April 27, 2017 Report Share Posted April 27, 2017 Mike you're such an old guy, "it's too noisy," "the engineers designed it that way so why change it?". "It came with rubber stock that will be good enough" 3 Quote Link to comment
Lozer Posted April 27, 2017 Author Report Share Posted April 27, 2017 I'm running r1 carbs on a ka24de so noise is not so much a worry for me. I'm gonna snatch up those aluminum ones and run those. I will run rubber trailing arm bushings tho. 1 Quote Link to comment
Noflers Posted April 27, 2017 Report Share Posted April 27, 2017 The only reason I have poly in my 510 is because rubber replacements aren't available for most. I've got poly mustache bar bushing I just installed, and poly subframe bushings that aren't on yet. The rest are new rubber. If I find rubber I'll go with that, otherwise it's poly for me. Have I not been looking long enough, or are there rubber bushings available for the subframe, mustache bar, and rear trailing arms? I agree with Mike, rubber is preferred by me too. Quote Link to comment
datzenmike Posted April 27, 2017 Report Share Posted April 27, 2017 Mike you're such an old guy, "it's too noisy," "the engineers designed it that way so why change it?". "It came with rubber stock that will be good enough" This is true. Why didn't they use solid or poly then? Quote Link to comment
Icehouse Posted April 27, 2017 Report Share Posted April 27, 2017 I don't care about noise either, it is my daily but max legal speed I see on the way to work is 40mph. So it can't we that loud. I'm so going to order some. I used a decibel meter phone app and it turns out my Sunny on the highway is louder than the plane ride I took to Hawaii. haha. 1 Quote Link to comment
q-tip Posted April 27, 2017 Report Share Posted April 27, 2017 This is true. Why didn't they use solid or poly then? Strictly for comfort, not performance. 2 Quote Link to comment
datzenmike Posted April 27, 2017 Report Share Posted April 27, 2017 But is the 'performance' really so dramatic over good rubber that it's worth it? Would the average Datsun driver even know it's better? 1 Quote Link to comment
paradime Posted April 28, 2017 Report Share Posted April 28, 2017 Once again Mike, I think it comes down to not everyone is as passionate about pragmatism as you. 2 Quote Link to comment
KoHeartsGPA Posted April 28, 2017 Report Share Posted April 28, 2017 But is the 'performance' really so dramatic over good rubber that it's worth it? Would the average Datsun driver even know it's better? Moot point, he's racing it. 1 Quote Link to comment
DISLEXICDIME Posted April 28, 2017 Report Share Posted April 28, 2017 If you don't do solid just do the savage washers Quote Link to comment
Noflers Posted April 28, 2017 Report Share Posted April 28, 2017 Well, the "standard" 15% power loss in the drivetrain can be brought down to 5% with poly bushings, and -15% with solid mounts. Kidding, nobody has that kind of proof. Anyway, poly makes things rougher, so maybe people see that as a power adder? Keep the pragmatism coming, Mike. I like it. 1 Quote Link to comment
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