Wheel Spacers and Handling - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 20 Old 12-27-2005, 12:19 PM Thread Starter
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Wheel Spacers and Handling

Have not seen this topic addressed so I thought I'd throw it out here.

I am currently running '95 Cobra R rims with 275/40/17 tires (Pirelli's for the street, V710's for the track) all around on the car in my sig. There is room to move the rear wheels outward maybe 3/4" or so. I am curious as to what might happen to the handling with the wider rear track. The car is a daily driver but also is used for Autocross (12-16 events per year) and HPDE's (couple days per year, more to come this year - Thank You HPT). Future mods include front coilovers and, eventually, rear coilovers and new LCA's (The current ones have been on there a while).

Any thoughts?

Al H


1997 Cobra, Born 3/19/1997, #3978/6961
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post #2 of 20 Old 12-27-2005, 01:58 PM
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push, plow, understeer......noticeably? Maybe not. How's the balance currently?

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post #3 of 20 Old 12-27-2005, 02:02 PM
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It will increase understeer. Most people who run sn95 a arms on the front are doing it to increase front track, and reduce understeer
Kart guys use spacers as a tuning tool.
Maybe a Kart site could give you more insights.

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post #4 of 20 Old 12-27-2005, 08:10 PM Thread Starter
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Well, I don't need any more understeer so adding spacers sounds like it would be a waste of time and money.

Thanks for the input.

Al H
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post #5 of 20 Old 12-27-2005, 08:40 PM
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I would like to run 1/2" or 3/4" spacers (do they make them this size?) for the rear of my car, and i was also wondering how SAFE they are to use on my daily driven Mustang?

1988 Coupe 5spd

Windsor JR's, XE264HR-14, Cobra intake, BBK long tubes, frame connectors, 4.10's, 03 Cobra brakes and wheels, FMS B springs

Last edited by Mavrick; 12-27-2005 at 09:09 PM.
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post #6 of 20 Old 12-27-2005, 09:30 PM
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H&R trak+ spacers

I don't know if you can space each rear wheel out .75", i used 25mm H&R hubcentric spacers on the rear of my car (6.25" backspace) and the tread of my 275s rubbed my rolled rear quarters a bit. It *felt* as if the car was a bit more level in corners, but this was probably placebo effect more than anything. I did not see a marked increase in understeer, however. your results may vary.

1996 Cobra
Maximum Motorsports 3-link rear, M/M Race valved Bilsteins, 475/350 coilover springs, Torsen T2R, full length subs, 17x10, 275s all around, Powerslot/Hawk HP+, Fluidyne 2 row
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post #7 of 20 Old 12-28-2005, 07:43 AM
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Quote:
Originally Posted by Micha
It will increase understeer. Most people who run sn95 a arms on the front are doing it to increase front track, and reduce understeer
Are the SN95 arms shorter than the Fox arms or something?
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post #8 of 20 Old 12-28-2005, 04:14 PM
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Quote:
Originally Posted by huesmann
Are the SN95 arms shorter than the Fox arms or something?
They are longer.

1988 Coupe 5spd

Windsor JR's, XE264HR-14, Cobra intake, BBK long tubes, frame connectors, 4.10's, 03 Cobra brakes and wheels, FMS B springs

Last edited by Mavrick; 12-28-2005 at 04:17 PM.
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post #9 of 20 Old 12-29-2005, 07:14 AM
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Then why did Micha say that guys running SN95 arms will reduce understeer (due to the wider track), yet he says wheel spacers will increase understeer?
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post #10 of 20 Old 12-29-2005, 08:41 AM
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I don't think you should run any spacers in the rear without a PanHard Bar if you are tracking the car.

I have a 98 Cobra with 03 Cobra wheels. I installed 1/4" spacers before I installed the panhard bar and the tires were hitting the lip of the wheel well on hard cornering at Summit Point Raceway.

I now have a MM Panhard Bar and I run 1" spacers with no problems.

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post #11 of 20 Old 12-29-2005, 10:15 AM
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Quote:
Originally Posted by huesmann
Then why did Micha say that guys running SN95 arms will reduce understeer (due to the wider track), yet he says wheel spacers will increase understeer?
SN95 arms(front control arms) on a FOX will widen the front track, which will reduce front weight transfer which effectively reduces understeer.

He was refering to spacers in the rear, which would increase understeer.

If you want a safe spacer setup,go to Maximum Motorsports and get their 1/2"
hubcentric spacer with longer wheel studs. I currently autocross this setup on the front with R-compound tires with no problems.

http://www.maximummotorsports.com/spacers.asp
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post #12 of 20 Old 12-29-2005, 04:36 PM
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I run the H&R hubcentric 1 inch spacers on the rear of my Cobra with 275/40 Michelin Pilot Sports on R58 Cobra Rs... The rear wheels now sit perfectly flush with the fenders and I noticed no *dramatic* increase of understeer... Car is full MM tubular in front with a MM panhard bar and adjustable MM arms in rear...


96 Cobra
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post #13 of 20 Old 12-30-2005, 02:26 AM
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Quote:
Originally Posted by Pach95GT
If you want a safe spacer setup,go to Maximum Motorsports and get their 1/2"
hubcentric spacer with longer wheel studs. I currently autocross this setup on the front with R-compound tires with no problems.

http://www.maximummotorsports.com/spacers.asp
Are longer wheel studs necessary? For the rear, using stock ranger axles, i'd like atleast 1/2" spacers. Do i need longer studs installed?

1988 Coupe 5spd

Windsor JR's, XE264HR-14, Cobra intake, BBK long tubes, frame connectors, 4.10's, 03 Cobra brakes and wheels, FMS B springs
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post #14 of 20 Old 12-30-2005, 12:59 PM
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It all depends on how much thread is exposed after you put the wheels on.

If the lug nuts can grab 6 or more threads with the spacer + wheel on , you should be ok. Would you want a wheel falling off at speeds because the lug nut wasnt threaded in enough ?
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post #15 of 20 Old 12-30-2005, 10:19 PM
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Ofcourse not.. but the way it looks, you do not need longer studs with the hub centric spacers, only the "bolt on" or "regular" spacers. Is this true?

1988 Coupe 5spd

Windsor JR's, XE264HR-14, Cobra intake, BBK long tubes, frame connectors, 4.10's, 03 Cobra brakes and wheels, FMS B springs
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post #16 of 20 Old 12-31-2005, 12:44 AM
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hubcentric spacers

yes, if you have the hubcentric spacers which have a set of studs pressed into them (ala the H&Rs which M/M sells), you do not need extended studs on your stock rear axles. you'll have to make sure that the recesses on the inside face of your wheels can accomodate any extra bit of stud that protrudes beyond the spacer, however.

1996 Cobra
Maximum Motorsports 3-link rear, M/M Race valved Bilsteins, 475/350 coilover springs, Torsen T2R, full length subs, 17x10, 275s all around, Powerslot/Hawk HP+, Fluidyne 2 row
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post #17 of 20 Old 12-31-2005, 05:08 PM
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Quote:
Originally Posted by mtbkr3
yes, if you have the hubcentric spacers which have a set of studs pressed into them (ala the H&Rs which M/M sells), you do not need extended studs on your stock rear axles. you'll have to make sure that the recesses on the inside face of your wheels can accomodate any extra bit of stud that protrudes beyond the spacer, however.
Thanks for clearing that up for me.

1988 Coupe 5spd

Windsor JR's, XE264HR-14, Cobra intake, BBK long tubes, frame connectors, 4.10's, 03 Cobra brakes and wheels, FMS B springs
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post #18 of 20 Old 01-16-2006, 12:05 AM
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I've got the R58 cobra rims on my car and am looking to get rid of the funny look of the rear wheels being tucked in. Will 1/4" MM non-hubcentric spacers work with my stock wheel studs? (kinda difficult to count threads with these wheels)

I'm gettin a panhard from them at the same time so i wont have rubbing issues to worry about anyways.

Matt
'95 GTS - (no engine) | TR-6060 | 9" w/Tru-Trac | Griggs T/A | MM Panhard | Koni DAs
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post #19 of 20 Old 01-16-2006, 02:57 AM
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you're not gonna notice a very big difference appearance-wise, but you'll be able to thread your lug nuts in without resorting to aftermarket studs (if the r58s have the same specs as the konig villains). if you're getting the panhard, you can get the 25mm h&r hubcentric spacers that have integrated studs, and use them with 9" wide, 6.25" backspace wheels without rubbing problems. It still looks odd though, especially as you decrease fender gap in the rear.

1996 Cobra
Maximum Motorsports 3-link rear, M/M Race valved Bilsteins, 475/350 coilover springs, Torsen T2R, full length subs, 17x10, 275s all around, Powerslot/Hawk HP+, Fluidyne 2 row
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post #20 of 20 Old 01-16-2006, 05:21 PM
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yeah well i dont want to change the rear track enough to change the car's handling. I just wanna push those wheels a little closer to the lip of the quarter panel so that it doesn't look like the axle is too narrow for the car like all the rest of the SN-95s out there. I figured that 1/4" would make a small difference.

Matt
'95 GTS - (no engine) | TR-6060 | 9" w/Tru-Trac | Griggs T/A | MM Panhard | Koni DAs
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