Poly or rubber on the firebird? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Suspension - Brakes - Steering
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 09-26-2006, 03:00 PM
Registered User
 
Join Date: Jun 2006
Location: G.P. TX
Posts: 9
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Poly or rubber on the firebird?

hey guys im trying to decide wether or not to buy a palyurethane suspension kit for my 68 firebird. ive heard lots of good stuff but ive also heard that you cant tell the diff beetween new rubber and new urethane. also ive heard that urethane is stiffer and gives a harsher ride during regualer driving. besides that, the urethane kit im looking at from energy suspension is a whopping 170 dollars! does anyone have any experience beetween the rubber and urethane?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-26-2006, 03:53 PM
302 Z28's Avatar  
Last photo:
Join Date: May 2003
Location: North Texas
Posts: 10,839
Wiki Edits: 0

Thanks: 1
Thanked 86 Times in 73 Posts
I prefer the poly bushings as they impart a more positive feel to the suspension. On a car like a Firebird or Camaro that is a plus IMO. I would not call the ride more harsh as much as I would call it positive. Just get the poly bushings that are graphite impregnated or you will be fighting squeaks until you change them out.

Vince
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-26-2006, 06:09 PM
Registered User
 

Last journal entry: In the beginning
Join Date: Mar 2006
Location: New Jersey
Posts: 16
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
poly or urethane

Im doing a 72 nova and I have the same concerns, I've already purchased the bushings and I am hesitant to install them !!
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-26-2006, 06:28 PM
Member
 
Last wiki edit: Ford axle ratio codes
Last journal entry: Rear Suspension
Last photo:
Join Date: Aug 2005
Location: Prattsville
Posts: 6,415
Wiki Edits: 31

Thanks: 2
Thanked 61 Times in 57 Posts
Quote:
Originally Posted by 302/Z28
I prefer the poly bushings as they impart a more positive feel to the suspension. On a car like a Firebird or Camaro that is a plus IMO. I would not call the ride more harsh as much as I would call it positive. Just get the poly bushings that are graphite impregnated or you will be fighting squeaks until you change them out.

Vince
any time there is a center shaft involved with a poly bushing, a little teflon tape stop's the squeaks.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-26-2006, 09:52 PM
1969NovaSS's Avatar
turbo lag......yeeeeehaaaaaaw
 
Last photo:
Join Date: Feb 2005
Location: oxnard,ca
Age: 27
Posts: 685
Wiki Edits: 0

Thanks: 0
Thanked 4 Times in 4 Posts
I used the poly bushings on my whole car and it does make a difference. It stiffened up a lot, makes the car feel mor solid, but you can feel big bumps in the road. The only time my car squeeks is when I go over a big dip with both tires at the same time.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-26-2006, 10:03 PM
larryblack's Avatar
Certified Lead Foot
 
Last photo:
Join Date: Jan 2003
Location: Houston, TX again
Age: 63
Posts: 519
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
With poly bushings, the car goes where you point it. RIGHT NOW! Not next week when things catch up with the steering wheel.

They will feel harsh at first, but so do BRAND NEW rubber ones. With poly bushings, the stiffness just does not go away. Mine lower control arms are now 105K and still tight.

It is a move you will NOT regret.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 09-26-2006, 10:15 PM
Registered User
 
Join Date: Jun 2006
Location: G.P. TX
Posts: 9
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
thanks guys i will go with the polyurethane and tell you how it turns out! I just need to scrape up 170 dollars! anyone wanna buy a 350 pontiac core with 5C heads?
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 09-26-2006, 10:25 PM
smoke's Avatar
Member
 
Last photo:
Join Date: Jun 2005
Location: Portland,Or
Age: 48
Posts: 113
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The reason the ride feels stiffer to most people is because the car is more solid I feel. It does not give as much as rubber does.
I put polly all around on my s10 with zq8 pacage and it helped body roll going around corners. I would put some good shocks on at the same time if you are looking for good handling.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 09-27-2006, 12:08 AM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: Found an LQ9 today
Last photo:
Join Date: Dec 2005
Location: Carlisle, PA
Age: 41
Posts: 5,312
Wiki Edits: 16

Thanks: 20
Thanked 23 Times in 18 Posts
I'm gonna go a bit different here. I did the PST polygraphite kit on the front of my 96 Impala SS and I am VERY disappointed. The ride firmed up a bit and cornering is decidedly crisper, but the penalties aren't worth it for me. Every bump is an intrusion on my ears, no matter how they are greased, lubed, tefloned, graphited, whatever, they just squeak... period. I even went as far as scuffing some of the bushings to reduce the squeaks and that's all it did... reduce the squeaks.

Something to consider. The low durometer of the rubber bushings allows pretty free suspension movement, but its almost like a very low tension spring. If you are designing a "proper" suspension (I say that in quotes because I don't know how precise and anal you want to be) you want to reduce any friction as much as possible. Race suspensions go to great lengths to remove the "fifth spring" by adding rigidity to the frame while using liberal amounts of heim joints and spherical joints on suspension pieces to make sure none of that unpredictability shows up in turn four.

when you switch to urethane, the durometer is exponentially stiffer. When I first installed mine on the lower arms, I could stand my 240-lb person on the ball joint and the arm would only deflect a few inches. If I bounced I could get it to move the bushing, but it truly adds an unpredictable amount of spring rate to the setup.

I'm going to remove mine in favor of Delrin/Aluminum sleeves. I came to this conclusion after experimenting some. I had a 66 Bonneville that I was itching to get on the road so I bought some race-style steel-on-steel bushed upper control arms in the right size to get it temporarily mobile. I expected it to be awful, but the freedom of motion made it actually a more pleasant ride than the original rubber. Zero deflection and a more compliant ride wasn't what I expected but its what happened. There was no discernable noise or harshness increase, but that is also largely to do with the geometry. The upper arms are dead-level, meaning that any hits don't produce any side loads on the bushings. Your F-body might get a bit of noise on a good bump since your upper arms hang down a bit at ride height.

This led me to the decision that (if solid bushings didn't make an appreciable difference on a 66 Bonneville marshmallow) that Delrin would be a good choice for the 96 SS. I've driven other SSs with the Delrin since that decision and I can tell you that hands down the Delrin eliminates the trade-offs of durometer and noise found in urethane. Its more expensive, but worth EVERY penny and I think you'll be very happy.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 09-27-2006, 02:53 AM
Member
 
Last wiki edit: Vacuum brake bleeder set up
Join Date: Nov 2003
Location: So Cal
Posts: 1,245
Wiki Edits: 8

Thanks: 0
Thanked 0 Times in 0 Posts
I'm with curtis. I am going to try some more tricks to get the poly to move some...but in the end I think I will replace them. One of the only good places to use poly is the anti-roll bar end links. That is because there is no relative motion. With rubber there is zero friction (there is however some spring rate). They make shoe soles and wheels out of poly because of how much friction it has!!! That should tell you it is not a good bearing material! If I bounce my truck up and down I can see the cross shaft twisting before the bushings move

IMO either go rubber or all the way to Delrin or Teflon lined spherical bearings.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 09-27-2006, 10:01 AM
1969NovaSS's Avatar
turbo lag......yeeeeehaaaaaaw
 
Last photo:
Join Date: Feb 2005
Location: oxnard,ca
Age: 27
Posts: 685
Wiki Edits: 0

Thanks: 0
Thanked 4 Times in 4 Posts
what Ive recently heard is that the poly bushings tend to bind your suspension on bumps. Thats why they have a harsher ride. Im not to sure about it but it was talked about on here.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 09-27-2006, 04:08 PM
Registered User
 
Join Date: Jun 2006
Location: G.P. TX
Posts: 9
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
thats exactly what ive been finding everywhere some say go others dont. which is good i suppose. no i think im going to use bout rubber and poly. im thinking poly on the control arms and on the frame and the rest rubber. hows that sound?
Reply With Quote Quick reply to this message

Recent Suspension - Brakes - Steering posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
1970 firebird rubber nose piece helpp!!!!! robfirebird70 Body - Exterior 0 03-15-2006 04:16 PM
Installing New Door Rubber horvath Interior 10 06-05-2004 09:27 PM
Poly vs rubber 71 Red Sled Suspension - Brakes - Steering 1 05-23-2004 09:39 PM
Poly vs. Rubber Bushings? Billy Boy Suspension - Brakes - Steering 6 04-28-2004 06:36 PM
Aluminum fuel line vs. rubber near engine McDeuce Engine 1 02-16-2004 07:39 PM


All times are GMT -6. The time now is 04:16 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.