home news shop history forum membership galleries regions calendar contact
   

Go Back   106 Rallye Register Forum > TUNING, MODIFICATIONS & UPGRADES > Suspension, Handling & Brakes

Suspension, Handling & Brakes Suspension set ups, uprated brakes

Reply
 
Thread Tools Display Modes
Old 11-04-2017, 10:22 PM   #1
Spanker
106 RALLYE REGISTER MEMBER
 
Join Date: Nov 2014
Location: London
Posts: 211
User Gallery
Turn in issues

I recently replaced a number of suspension parts and it has resulted in the initial turn in getting worst even at very low speed, the first quarter of a turn almost does nothing, looking for causes to this...

Replaced:

B6 dampers with B8 shortened dampers
Fitted secondhand 160lb H&R springs from standard springs
Removed Slavesta's negative camber kit and refitted Powerflex purple bushes
Re-tracked to account for camber returning to standard
New lower arms, both sides
Lowered rear beam to match new H&R springs, plus fitted Powerflex purple bushes

I am thinking that it is either incorrectly fitted bushes, incorrect lower arms or tracking needs re-adjusting.

I had the car looked at today, and nothing was obviously wrong, waiting for the senior mechanic to return from the N'ring this Thursday.

Appreciate any advice...

Spencer

Last edited by Spanker; 11-04-2017 at 10:25 PM.
Spanker is offline   Reply With Quote
Old 11-04-2017, 10:27 PM   #2
Petros
SOON TO BE FREELOADER - PLEASE JOIN UP NOW!
 
Join Date: Jul 2015
Location: Croatia
Posts: 92
User Gallery
Many changes

Make front toe more open (negative)
Lowered rear probably did less agile rear end
Petros is offline   Reply With Quote
Old 12-04-2017, 07:31 AM   #3
welshpug
106 RALLYE REGISTER MEMBER

 
welshpug's Avatar
 
Join Date: Mar 2006
Location: cwmcarn
Posts: 4,847
User Gallery
rear too low can massively affect turn in.

what tyres and pressures? play in steering rack?
welshpug is offline   Reply With Quote
Old 12-04-2017, 12:46 PM   #4
Spanker
106 RALLYE REGISTER MEMBER
 
Join Date: Nov 2014
Location: London
Posts: 211
User Gallery
Front springs were a 30mm drop, we roughly matched the rear to the front ride height.

Tyres are Nankang NS-2R 185/60 R14 track compound, 31 PSI
Spanker is offline   Reply With Quote
Old 12-04-2017, 01:26 PM   #5
Petros
SOON TO BE FREELOADER - PLEASE JOIN UP NOW!
 
Join Date: Jul 2015
Location: Croatia
Posts: 92
User Gallery
Quote:
Originally Posted by Spanker View Post
Tyres are Nankang NS-2R 185/60 R14 track compound, 31 PSI
31 hot?

You can try lower front pressure or raise rear.
Optimal hot pressure for that tire is between 28-32psi
Petros is offline   Reply With Quote
Old 12-04-2017, 01:31 PM   #6
Spanker
106 RALLYE REGISTER MEMBER
 
Join Date: Nov 2014
Location: London
Posts: 211
User Gallery
I do not believe the tyre pressure is the cause here, I run them 29 hot on the track and 31 cold on the road, either way the tyre pressure is not making a significant difference to the issue.

What else could cause the initial turn in response to decrease? This happens even at low speed, and was a result of the changes listed..

Maybe we did go too low on the rear..

Could incorrect tracking make that much of a difference to the turn in/steering response?
Spanker is offline   Reply With Quote
Old 12-04-2017, 01:45 PM   #7
Petros
SOON TO BE FREELOADER - PLEASE JOIN UP NOW!
 
Join Date: Jul 2015
Location: Croatia
Posts: 92
User Gallery
Quote:
Originally Posted by Spanker View Post
Could incorrect tracking make that much of a difference to the turn in/steering response?
Yes
You probably changed cambers and toe, but too low rear end could be a cause.

Did you do optical alignment after all modes and is there a difference to previous one?
Petros is offline   Reply With Quote
Old 12-04-2017, 02:33 PM   #8
Harv
Slower Than Mike
 
Harv's Avatar
 
Join Date: Mar 2007
Location: Louth, Lincs
Posts: 3,356
User Gallery Car Blog
I'd put the rear up another notch and see how it feels - chances are the tracking's OK if done properly, but the weight transfer will be disrupted with stiffer springs and a lower rear.

The differential spring rate front to rear will probably have an effect as well, not sure how much mind.
Harv is offline   Reply With Quote
Old 12-04-2017, 03:02 PM   #9
welshpug
106 RALLYE REGISTER MEMBER

 
welshpug's Avatar
 
Join Date: Mar 2006
Location: cwmcarn
Posts: 4,847
User Gallery
check the sill heights, you want a slight rake, i.e rear slightly up.

stiff front with standard rear doesn't make a nice handling car either in my experience, I've matched 21mm bars to 180 lb springs.
welshpug is offline   Reply With Quote
Old 12-04-2017, 03:34 PM   #10
ejarvo
106 RALLYE REGISTER MEMBER
 
ejarvo's Avatar
 
Join Date: Sep 2008
Location: Milton Keynes
Posts: 332
User Gallery
+1 for the rake.

I remember going up a notch and noticed the difference. It was way more responsive on turn-in. They're not designed to be flat to the floor (not saying yours is), they're designed with a bit of "rake" in mind.
ejarvo is offline   Reply With Quote
Old 12-04-2017, 03:51 PM   #11
welshpug
106 RALLYE REGISTER MEMBER

 
welshpug's Avatar
 
Join Date: Mar 2006
Location: cwmcarn
Posts: 4,847
User Gallery
stop this notch business!!!

do it properly, pull torsion bar out, move arm, refit bar after indexing to where both splines slide in without mashing the end of the bar in, that way you get about 2-3mm adjustment in height, not 30+
welshpug is offline   Reply With Quote
Old 12-04-2017, 05:03 PM   #12
Harv
Slower Than Mike
 
Harv's Avatar
 
Join Date: Mar 2007
Location: Louth, Lincs
Posts: 3,356
User Gallery Car Blog
Sorry, I'd forgotten about the bodger's rear beam method, perhaps not the best choice of phrasing!
Harv is offline   Reply With Quote
Old 12-04-2017, 05:26 PM   #13
Spanker
106 RALLYE REGISTER MEMBER
 
Join Date: Nov 2014
Location: London
Posts: 211
User Gallery
Thank you for all the answers

The rear has standard torsion bars with b8 dampers, it was lowered properly with the bars out etc, how many mm would you recommend bringing the rear back up by? Or just get it higher than the front by?
Spanker is offline   Reply With Quote
Old 14-04-2017, 07:17 PM   #14
Spanker
106 RALLYE REGISTER MEMBER
 
Join Date: Nov 2014
Location: London
Posts: 211
User Gallery
It was the tracking, too much toe out.
Spanker is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT. The time now is 10:13 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.