Offsets and handling

Coupe-R · 13th August 2007, 10:23 PM

Will increasing the front track relative the the rear increase or decrease understeer and overall handling charactistics? Turn in levels etc etc

Rears have a 15x7 +40 and fronts having a 15x7 +35

so thats a total of 10mm wider front track.

What would be the best setup?

Coupe-R · 14th August 2007, 09:46 AM

I read that changing the offset from say a +45 on a 15x7 rim to a +20 for example could increase the scrub radius.

That is the angle from the king pin pivot point to the centre line of the tyre.

Effects are:
Increased torque steer and bump steer
Also it will reduce spring rate cause effectively you have a larger leaver acting on the suspension (weight further out) (dunno how true this is)

Also wheels with larger offset can hurt the bearings etc with more loading further out.

It also said double wish bone (a arm honda setup) is better for reducing toruqe steer cause the angle of the scrub radius is reduced. (So what about the DC5 etc)

However I think all of this would only be noticed if say I went to a +20 offset or something from a +45 stock offset (which would be stupid anyways)

Still no mention of increasing grip and reducing under steer from increasing track?

turbozxi · 14th August 2007, 05:53 PM

My teg with fairly low offset rims has much more torque steer now, even though it has less power then before. It turns in ok but the steering seems to easy I am probably not used to it yet but am going to get a manual rack. Need to get rid of some the camber in the rear before I could comment about increased grip..

tianporn · 14th August 2007, 08:19 PM

Lower offset will create a more reponsive turn and smaller turning circle right?

Coupe-R · 14th August 2007, 09:05 PM

hmm thats the idea that the drifters have yeh

sirwags_np · 18th August 2007, 07:25 AM

Quote:

Originally Posted by Coupe-R

I read that changing the offset from say a +45 on a 15x7 rim to a +20 for example could increase the scrub radius.

That is the angle from the king pin pivot point to the centre line of the tyre.

Effects are:
Increased torque steer and bump steer
Also it will reduce spring rate cause effectively you have a larger leaver acting on the suspension (weight further out) (dunno how true this is)

Also wheels with larger offset can hurt the bearings etc with more loading further out.

It also said double wish bone (a arm honda setup) is better for reducing toruqe steer cause the angle of the scrub radius is reduced. (So what about the DC5 etc)

However I think all of this would only be noticed if say I went to a +20 offset or something from a +45 stock offset (which would be stupid anyways)

Still no mention of increasing grip and reducing under steer from increasing track?

when i put 25mm spacers on my wagon, i noticed i could wind the coilovers down a fair bit more to match the cert height, and it does seem to tram track a lil bit more

Non Vtec · 18th August 2007, 09:24 AM

my old mans classic we put 10mm spacers on the back, car handles about 100% different.

Coupe-R · 28th August 2007, 09:30 AM

Ill see how my turn in is affected by 35mm front and 40mm rear soon.

Coupe-R · 13th January 2008, 12:10 AM

saw this old post that is sorta related to tim putting big spacers on the EK.

Cause i don't race my car much I noticed no differences with only a 10mm increased track on taupo circut.

13th August 2007, 10:23 PM	#1 (permalink)
Coupe-R Senior Member 9,000rpm (S2000 Redline!) Join Date: Apr 2002 Posts: 6,965 Location: Tauranga	Offsets and handling Will increasing the front track relative the the rear increase or decrease understeer and overall handling charactistics? Turn in levels etc etc Rears have a 15x7 +40 and fronts having a 15x7 +35 so thats a total of 10mm wider front track. What would be the best setup?

14th August 2007, 08:19 PM	#4 (permalink)
tianporn Senior Member 7,000rpm (Peak Power) Join Date: Sep 2003 Posts: 2,683 Location: Auckland	Lower offset will create a more reponsive turn and smaller turning circle right? __________________ NZH PhotoCrew.

18th August 2007, 09:24 AM	#7 (permalink)
Non Vtec Senior Member 7,000rpm (Peak Power) Join Date: Jun 2002 Posts: 2,521 Location: Te Awamutu	my old mans classic we put 10mm spacers on the back, car handles about 100% different. __________________ need porsche parts? PM me.. www.europacific.co.nz

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

14th August 2007, 09:46 AM	#2 (permalink)
Coupe-R Senior Member 9,000rpm (S2000 Redline!) Join Date: Apr 2002 Posts: 6,965 Location: Tauranga	I read that changing the offset from say a +45 on a 15x7 rim to a +20 for example could increase the scrub radius. That is the angle from the king pin pivot point to the centre line of the tyre. Effects are: Increased torque steer and bump steer Also it will reduce spring rate cause effectively you have a larger leaver acting on the suspension (weight further out) (dunno how true this is) Also wheels with larger offset can hurt the bearings etc with more loading further out. It also said double wish bone (a arm honda setup) is better for reducing toruqe steer cause the angle of the scrub radius is reduced. (So what about the DC5 etc) However I think all of this would only be noticed if say I went to a +20 offset or something from a +45 stock offset (which would be stupid anyways) Still no mention of increasing grip and reducing under steer from increasing track?

14th August 2007, 05:53 PM	#3 (permalink)
turbozxi Senior Member 7,000rpm (Peak Power) Join Date: Feb 2002 Posts: 4,248 Location: Auckland	My teg with fairly low offset rims has much more torque steer now, even though it has less power then before. It turns in ok but the steering seems to easy I am probably not used to it yet but am going to get a manual rack. Need to get rid of some the camber in the rear before I could comment about increased grip..

14th August 2007, 09:05 PM	#5 (permalink)
Coupe-R Senior Member 9,000rpm (S2000 Redline!) Join Date: Apr 2002 Posts: 6,965 Location: Tauranga	hmm thats the idea that the drifters have yeh

28th August 2007, 09:30 AM	#8 (permalink)
Coupe-R Senior Member 9,000rpm (S2000 Redline!) Join Date: Apr 2002 Posts: 6,965 Location: Tauranga	Ill see how my turn in is affected by 35mm front and 40mm rear soon.

13th January 2008, 12:10 AM	#9 (permalink)
Coupe-R Senior Member 9,000rpm (S2000 Redline!) Join Date: Apr 2002 Posts: 6,965 Location: Tauranga	saw this old post that is sorta related to tim putting big spacers on the EK. Cause i don't race my car much I noticed no differences with only a 10mm increased track on taupo circut.