Pennock's Fiero Forum
  Technical Discussion & Questions
  Good rear coilovers to have 245/60R16 tires?

Post New Topic  Post A Reply
Email This Page to Someone! | Printable Version


next newest topic | next oldest topic
Good rear coilovers to have 245/60R16 tires? by Squall86GT
Started on: 10-16-2020 09:32 AM
Replies: 9 (136 views)
Last post by: fieroguru on 10-18-2020 09:06 AM
Squall86GT
Member
Posts: 11
From: Warsaw, IN
Registered: Oct 2020


Feedback score: N/A
Leave feedback

Rate this member

Report this Post10-16-2020 09:32 AM Click Here to See the Profile for Squall86GTSend a Private Message to Squall86GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
Hey guys,
The tires on the back of this thing just look too small. There’s some aftermarket wheels that are 16“ x 7“ wide I believe. Anyway I’ve got plenty of room in the wheel well and it would help out those RPMs a little bit- what is a good solid coil over kit for the rear that would give me plenty of space to have tires are a lot wider and a little bit taller? Thanks!
IP: Logged
PFF
System Bot
Spadesluck
Member
Posts: 1741
From: New Mexico
Registered: Jul 2016


Feedback score:    (6)
Leave feedback

Rate this member

Report this Post10-16-2020 11:30 AM Click Here to See the Profile for SpadesluckSend a Private Message to SpadesluckEdit/Delete MessageReply w/QuoteDirect Link to This Post
You have really two options:

1. Make your own

2. Purchase from Fieroguru
IP: Logged
olejoedad
Member
Posts: 14168
From: Clarendon Twp., MI
Registered: May 2004


Feedback score: (5)
Leave feedback





Total ratings: 190
Rate this member

Report this Post10-16-2020 11:46 AM Click Here to See the Profile for olejoedadClick Here to Email olejoedadSend a Private Message to olejoedadEdit/Delete MessageReply w/QuoteDirect Link to This Post
Depending on wheel offset, you may not need coilovers.

I run 245/45/17's with original struts.
IP: Logged
pmbrunelle
Member
Posts: 3620
From: Grand-Mère, Québec
Registered: Sep 2008


Feedback score: N/A
Leave feedback





Total ratings: 55
Rate this member

Report this Post10-16-2020 12:14 PM Click Here to See the Profile for pmbrunelleClick Here to Email pmbrunelleSend a Private Message to pmbrunelleEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by olejoedad:

Depending on wheel offset, you may not need coilovers.

I run 245/45/17's with original struts.


Offset of your wheels that work without coilovers?

And original GM struts? Or aftermarket such as KYB, Monroe, Gabriel?
IP: Logged
olejoedad
Member
Posts: 14168
From: Clarendon Twp., MI
Registered: May 2004


Feedback score: (5)
Leave feedback





Total ratings: 190
Rate this member

Report this Post10-16-2020 05:22 PM Click Here to See the Profile for olejoedadClick Here to Email olejoedadSend a Private Message to olejoedadEdit/Delete MessageReply w/QuoteDirect Link to This Post
17x7x40

88 Formula
Probably has KYB's on it.
IP: Logged
fieroguru
Member
Posts: 11304
From: Champaign, IL
Registered: Aug 2003


Feedback score:    (45)
Leave feedback





Total ratings: 255
Rate this member

Report this Post10-16-2020 08:14 PM Click Here to See the Profile for fieroguruSend a Private Message to fieroguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
The 88s have more room to the spring perch as the strut mounts a little higher and more of an angle to the knuckle.
IP: Logged
Squall86GT
Member
Posts: 11
From: Warsaw, IN
Registered: Oct 2020


Feedback score: N/A
Leave feedback

Rate this member

Report this Post10-16-2020 11:25 PM Click Here to See the Profile for Squall86GTSend a Private Message to Squall86GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
Got an 86. Would this work? https://www.ebay.com/itm/381755089522

How does one know how much bigger of a tire or a particular coil over will let you have?
IP: Logged
fieroguru
Member
Posts: 11304
From: Champaign, IL
Registered: Aug 2003


Feedback score:    (45)
Leave feedback





Total ratings: 255
Rate this member

Report this Post10-17-2020 10:25 AM Click Here to See the Profile for fieroguruSend a Private Message to fieroguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
The interference issue is with the lower spring perch and the larger diameter spring (4.5" OD) that sits on top of it.
To maximize the clearance, most people remove the spring perch (the linked coilovers do not do this) and switch to a 2.5" ID (3.5" OD spring).
For extreme fitments (9.5"+ wide) some keep the weld bead for the stock spring perch and mount the adjuster sleeve on top.
IP: Logged
Squall86GT
Member
Posts: 11
From: Warsaw, IN
Registered: Oct 2020


Feedback score: N/A
Leave feedback

Rate this member

Report this Post10-17-2020 10:18 PM Click Here to See the Profile for Squall86GTSend a Private Message to Squall86GTEdit/Delete MessageReply w/QuoteDirect Link to This Post
So you can simply remove the perch and change the springs and that allows you to have a taller and wider tire if you want to? Roughly speaking how much taller and wider than stock? I don’t wanna put monster truck tires on - just wanna understand what that will look like. Any negatives? Thanks a lot
IP: Logged
fieroguru
Member
Posts: 11304
From: Champaign, IL
Registered: Aug 2003


Feedback score:    (45)
Leave feedback





Total ratings: 255
Rate this member

Report this Post10-18-2020 09:06 AM Click Here to See the Profile for fieroguruSend a Private Message to fieroguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
Here is a picture of a stock spring setup with a stock 15" wheel:



This is the interference you want to avoid with coilovers:


How large of a diameter tire you can run, really depends on how low you want the chassis to sit. Too large and too low the tire will hit the upper wheel well liner and upper frame rail. Stock tire diameter is about 24.6" running 25" or 26" tire with a moderate stance normally isn't an issue with frame rail clearance (but depending on width and offset you will need to make sure the tire will clear the springs on the struts).

There are several ways to build coilovers. One of the options is how to mount the sleeves.
On the weld bead of the stock spring perch. When you go this route, the need to be very careful with the spring length (10 or 8) as well as make sure there is enough compression range in the spring to avoid coil bind. If you get springs that are too long, you will be limited on how low you can lower the car. The spring shown in the picture is 10" 275 lb/in and WILL coilbind before bottoming out the strut. It also runs out of adjustment at the bottom with the car only lowered about 1".


Removing the weld bead and placing the adjuster sleeve on the knuckle bracket. This setup almost always runs a 12" spring and doesn't have any issue with coil bind and gives you largest range of adjustability.


The struts in these pictures are Konis and they have been discontinued. KYB is the most common strut used now and it has a black strut body.

[This message has been edited by fieroguru (edited 10-18-2020).]

IP: Logged

next newest topic | next oldest topic

All times are ET (US)

Post New Topic  Post A Reply
Hop to:

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock