Harsh riding GT, possible Bullitt spring swap - Ford Mustang Forums : Corral.net Mustang Forum
 
LinkBack Thread Tools Display Modes
post #1 of 12 Old 03-16-2011, 12:06 AM Thread Starter
Registered User
 
Trader Feedback: (4)
Join Date: Dec 2001
Location: Milwaukee, WI
Posts: 97
Harsh riding GT, possible Bullitt spring swap



Scenario- 91GT. 160K miles. Modified in 1990's(exact history unknown) with B springs(verified) and crappy struts- silver ones in front(KYB GR2?) And yellow ones in the back-- I think Monroe, they're not Billstiens. I'm pretty sure the struts are old and worn out as well. The car has the stock camber plates. There is poly bushings on the sway bar and under the transmission. Everything else appears to be stock.

I'm looking for ride quality first and handling performance secondary. Would like a slightly lowered look though so no stock GT springs.

This car rides so bad I'm almost mad that I let myself buy it. The front end bottoms out very easily. The car darts all over the road at any slight irregularity in the surface. Tons of NVH into the cabin. Just crap.

I'm trying to figure out an approach to get a decent ride-- keep in mind this is Wisconsin and are roads are terrible inside most of the cities. Slab concrete, pot holes, bumps, cracks, etc.

I'm thinking Bullitt springs and Tokico blues. Should I use poly isolators? Is there any other bushings to replace during a spring/strut swap I may need to address?

Looking for some veteran opinions on this so I can get this car setup so it's actually enjoyable to drive. Thanks!

Wes87GT is offline  
Sponsored Links
Advertisement
 
post #2 of 12 Old 03-16-2011, 10:03 AM Thread Starter
Registered User
 
Trader Feedback: (4)
Join Date: Dec 2001
Location: Milwaukee, WI
Posts: 97
Ok, so I did a ton of reading last night using the search function here. I've come up with Koni str.t dampers and Ford Bullitt springs(can get locally from a dealer). I've decided to avoid poly bushings. Are they any OE style bushings I will need to replace during the procedure? What's everyones feelings on spring ISO's?

Wes87GT is offline  
post #3 of 12 Old 03-16-2011, 11:46 AM
Registered User
 
Apocolipse's Avatar
 
Trader Feedback: (0)
Join Date: Jun 2008
Location: Bulrington, Ontario
Posts: 289
Throw a coilover kit in the front. New cc plates, struts, springs, you will thank me after feeling the ride! 10000x better then conventionally placed springs / strut setup.
Apocolipse is offline  
Sponsored Links
Advertisement
 
post #4 of 12 Old 03-16-2011, 11:59 AM Thread Starter
Registered User
 
Trader Feedback: (4)
Join Date: Dec 2001
Location: Milwaukee, WI
Posts: 97
Quote:
Originally Posted by Apocolipse View Post
Throw a coilover kit in the front. New cc plates, struts, springs, you will thank me after feeling the ride! 10000x better then conventionally placed springs / strut setup.
Can you install that on stock control arms? My front is all stock besides B-springs and possibly sway bar(just bought the car modified this way).
Wes87GT is offline  
post #5 of 12 Old 03-17-2011, 07:27 AM
Registered User
 
huesmann's Avatar
 
Trader Feedback: (6)
Join Date: Jul 2004
Location: DC burbs, MD side
Posts: 6,894
Of course!
huesmann is offline  
post #6 of 12 Old 03-17-2011, 11:40 AM Thread Starter
Registered User
 
Trader Feedback: (4)
Join Date: Dec 2001
Location: Milwaukee, WI
Posts: 97
Yah, I'm trying to find some MM coilovers for sale now. I hope I'm making the right choice.
Wes87GT is offline  
post #7 of 12 Old 03-18-2011, 02:05 AM
Registered User
 
Apocolipse's Avatar
 
Trader Feedback: (0)
Join Date: Jun 2008
Location: Bulrington, Ontario
Posts: 289
U are for sure. The way stock location suspension is designed, a coil over will feel like your driving on a cloud! So don't be afraid to go stiffer then what you think 'comfy' may be.
Apocolipse is offline  
post #8 of 12 Old 03-18-2011, 10:19 PM
Registered User
 
Trader Feedback: (1)
Join Date: May 2009
Location: Nowhere, Special
Posts: 574
Don't forget that coil over rates are much different than non-coil over rates. Call Maximum Motorsports for their recommendations.
MJ91GT is offline  
post #9 of 12 Old 03-20-2011, 12:59 PM
Registered User
 
Trader Feedback: (11)
Join Date: Nov 1999
Location: Where the Navy sends me...
Posts: 4,137
While I agree that the coil-over geometry up front improves the ride quality, I'm not sure the difference is big enough to justify the added cost, particularly when he's talking about just running normal stock-ish spring rates. The difference in ride quality between a 350# coil-over spring and the equivalent ~1250# conventional spring would be substantial, but I think it wouldn't be nearly as substantial when you're talking conventional springs that aren't even 1/2 that firm. That's just a guess, though - I don't know of anyone that has done a comparison of stock springs vs. equivalent coil-over springs (which would only be ~175#).

I see on another forum that Wes87GT has already ordered some Bilsteins for up front. That should make a nice difference when paired with some appropriate springs, either normal or coil-over.

'89 GT convertible, N/A 357W, MM front susp w/425# coil-overs and Koni D/As, MM TA/PB rear setup (Koni Yellows, 390-430# springs), Stoptech 332mm / 12" Baers, MM 6 point rollbar, Maier 1.5" flared fenders & quarters, 18x9.5" front/18x10.5" rear Enkei RPF-1s (street), 18x10" CCW C-10s (track), etc...
Patrick Olsen is online now  
post #10 of 12 Old 03-20-2011, 02:11 PM
Registered User
 
Trader Feedback: (0)
Join Date: Jun 2001
Location: Earth
Posts: 1,688
Aren't B springs about the same rate as Bullitts? They're longer though.

I had very short springs for looks. In town they were fine but at higher speeds the ride and geometry were crap.
I also had a bushing go bad and that made it very darty.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
terryr is offline  
post #11 of 12 Old 03-20-2011, 03:37 PM
Registered User
 
qtrracer's Avatar
 
Trader Feedback: (34)
Join Date: Jun 2004
Location: Maryland
Posts: 5,354
I ran C springs (F-650 linear; R-200-300 progressive) on my 86 for a bunch of years with Monroe Formula GPs (a Saleen spec strut/shock back when). Ride quality was crap (also used poly upper strut and sta-bar bushings). Finally switched to a Bilstein damper F/R and ride quality improved. Was still firm but not harsh. Then I went to an MM C/O kit for the Bils using 300# Hypers. As Partick surmised, not a lot of difference in ride quality. In fact a far cry from "cloud-like" but keep in mind that the front wheel rate with the Cs is 162.5# whereas with my C/O springs it's 270#. So for a higher wheel rate the ride quality more-or-less stayed the same. My points are (i) make certain the damper is equal to the spring rate and (ii) don't expect miracles in ride quality unless the wheel rate is substantially reduced.
qtrracer is online now  
post #12 of 12 Old 03-20-2011, 09:38 PM
Registered User
 
Apocolipse's Avatar
 
Trader Feedback: (0)
Join Date: Jun 2008
Location: Bulrington, Ontario
Posts: 289
If you want to float on the street don't drive a sports car... Nuff said.

My ride is comparable to the '11 bmw 3 series in the driveway too.
Apocolipse is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Mustang Forums : Corral.net Mustang Forum forums, you must first register.
Please enter your desired user 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:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
For Sale 95 mustang gt and 97 mustang cobra swap gt 1lo94 Mustangs For Sale/Wanted, 1994-1998 0 03-14-2011 12:25 PM
04 GT to 04 Mach1 2V/4V Swap questions... quikbluewagon SVT & DOHC 2 03-08-2011 08:32 AM
For Sale Bullitt Intake Swap hawks05 Modular Engine Parts 9 02-16-2011 11:00 PM
V6 to V8 swap questions tvanlant 94/95 Tech 8 11-10-2010 09:31 PM
LOW mileage 01 GT (03 cobra swap) adam` Mustangs For Sale/Wanted, 1999-2004 5 09-13-2009 06:13 AM

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

 
For the best viewing experience please update your browser to Google Chrome