Old Man Emu +2" - JeepForum.com
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post #1 of 24 Old 09-30-2009, 08:27 AM Thread Starter
JMOSS
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Old Man Emu +2"

I have installed +2" OLD MAN EMU on my WJ 4.7v8 , OME model: light wheight front an medium weight rear.

Is it normal that i have a difference ( rear >front ) that is about 1.3" (3 cm) beetwen front and rear?

More taan 1.000 miles runned with the new coil springs...

tx


99 WJ 4.7V8 Limited QTII , LPG system, 180 Tstat, Magnaflow cat, Up country coil springs, Procomp MX6 shocks absorber, ADDCO swaybars & gresonable bushings, General Grabber AT2 tires, Usa spec pa-chr11 Ipod interface.
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post #2 of 24 Old 09-30-2009, 08:59 AM
99avant
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Yes, different lift heights to the front and rear are normal. The rear is higher from the factory, so many kits lift the front more to compensate for this.

But it sounds like the rear is higher than the front on yours? This must be because you used the light in the front and the meduim in the rear, those achieve different lift heights.

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post #3 of 24 Old 09-30-2009, 09:03 AM
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Check your hub to fender measurements and give us those. That will help to see the difference.

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post #4 of 24 Old 09-30-2009, 09:18 AM Thread Starter
JMOSS
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Front from the hub = 85.5 cm = 33.6"
Rear frorm the hub = 88.5 cm = 34.8"

Tires 245/70/16 general grabber at2 - new.....with the old ones, GY Hp all wehater , it was 0.2" less...

Before, with Up country coil springs :

front= 83 cm = 32.6"
rear = 84 cm = 33"

Olm Man EMU sayd this springs is not +2" but + 1.6" - 4 cm

99 WJ 4.7V8 Limited QTII , LPG system, 180 Tstat, Magnaflow cat, Up country coil springs, Procomp MX6 shocks absorber, ADDCO swaybars & gresonable bushings, General Grabber AT2 tires, Usa spec pa-chr11 Ipod interface.
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post #5 of 24 Old 09-30-2009, 09:47 AM
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JMOSS - normally folks measure from the center of the wheel hub to the bottom of the opening of the fender flare. Do this for each corner of the jeep. You should probably be getting something around 19-21 inches.

Your numbers suggest that you got about 1 in front and 1.8 in rear from your previous Upcountry configuration. Considering a UC probably gives you about 1/2 in over stock, I would conclude you got a little short changed. Probably because of Light Load springs in front and medium load springs in rear. You could add a OME 10mm trim packer or 3/4in spacer for a little more perhaps.

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Last edited by txtumbleweed; 09-30-2009 at 10:00 AM.
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post #6 of 24 Old 09-30-2009, 09:51 AM
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And the measurements from OME is for the stock springs probably, not the UpCountry. Those were longer than regular springs.

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post #7 of 24 Old 09-30-2009, 10:11 AM Thread Starter
JMOSS
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This mesuraments are from the ground > center ub > opening of the fender flare

we do in this way in italy.....

i'll measure like you do and tomorrow I'll post them

anyway, 1.2" inch of difference is uncontrovertible data, is not real important the eight of the front and of the rear, or not?

stoke difference REAR> FRONT is about 0.4 inch......the same with up country coil springs......

Should be that the OME rear ones need more miles to adjust to the normal eight?

99 WJ 4.7V8 Limited QTII , LPG system, 180 Tstat, Magnaflow cat, Up country coil springs, Procomp MX6 shocks absorber, ADDCO swaybars & gresonable bushings, General Grabber AT2 tires, Usa spec pa-chr11 Ipod interface.
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post #8 of 24 Old 09-30-2009, 10:13 AM
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Quote:
Originally Posted by JMOSS View Post
This mesuraments are from the ground > center ub > opening of the fender flare

we do in this way in italy.....

i'll measure like you do and tomorrow I'll post them

anyway, 1.2" inch of difference is uncontrovertible data, is not real important the eight of the front and of the rear, or not?

stoke difference REAR> FRONT is about 0.4 inch......the same with up country coil springs......

Should be that the OME rear ones need more miles to adjust to the normal eight?
Tire size, thread depth, and level of inflation can throw off those readings, that's why we measure center of hub to bottom of fender. Then the tire cannot make any difference.

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post #9 of 24 Old 09-30-2009, 01:08 PM
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Quote:
Originally Posted by the88thpianoman View Post
Tire size, thread depth, and level of inflation can throw off those readings, that's why we measure center of hub to bottom of fender. Then the tire cannot make any difference.

Um, since the tire is mounted TO the wheel...yes it will make a difference. Unless you make sure all tires are perfectly equal in every way, it doesn't matter how you measure, it'll always be off because of the tires.

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post #10 of 24 Old 09-30-2009, 01:11 PM
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Quote:
Originally Posted by WXman View Post
Um, since the tire is mounted TO the wheel...yes it will make a difference. Unless you make sure all tires are perfectly equal in every way, it doesn't matter how you measure, it'll always be off because of the tires.
When you measure hub to fender, it doesn't matter if you 100psi or 0 psi in your tire. The hub stays in the same place and tire pressure won't effect it. Yes the jeep may be lower but the spring is what is holding the axle at the height, not the tire.

Go out to your jeep, measure hub to fender. Let all the air out of your tires and measure it again. I bet it is the same.

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post #11 of 24 Old 09-30-2009, 01:15 PM
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I disagree. If a tire is low on one corner, it's going to cause the suspension to be offset on the opposite side, and especially the opposite corner. That's why a vehicle with a flat tire sags and sits all awkward if you look at it from behind. 0 psi somewhere is going to give you much different readings hub to fender than all tires at 40 psi or whatever.

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post #12 of 24 Old 09-30-2009, 01:20 PM
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Yes true but who is measuring the hub to fender with tires varying that much in psi. If they are close, it isn't going to make a that much of a difference. How else would you recommend measuring to figure out lift height?

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post #13 of 24 Old 09-30-2009, 01:54 PM
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You put light duty springs in the front of a Jeep with a big *** V8 and then heavier duty springs in the rear. You also had the UC package before so the OME spring wont net the normal amount of height. With the lift configuration you now have the rake was to be expected.
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post #14 of 24 Old 10-01-2009, 02:02 AM Thread Starter
JMOSS
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Ok, here we are.

From tthe hub to the fender:

front 19.45 inch
rear 20.65 inch

no rilevant difference from different corners.

I changed tires two weeks ago, there were always 1.2 inch of differnece......

99 WJ 4.7V8 Limited QTII , LPG system, 180 Tstat, Magnaflow cat, Up country coil springs, Procomp MX6 shocks absorber, ADDCO swaybars & gresonable bushings, General Grabber AT2 tires, Usa spec pa-chr11 Ipod interface.

Last edited by JMOSS; 10-01-2009 at 02:25 AM.
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post #15 of 24 Old 10-01-2009, 02:10 AM Thread Starter
JMOSS
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Quote:
Originally Posted by Fraser_Brown View Post
You put light duty springs in the front of a Jeep with a big *** V8 and then heavier duty springs in the rear. You also had the UC package before so the OME spring wont net the normal amount of height. With the lift configuration you now have the rake was to be expected.
Sorry, not a lot of confidence with language.....Do you thing i have the wrong springs front ?

Consider that the ones who as "obligated" me to use them is OME Italy.
The front OME SPRING mesure correctly, + 1.6 inch respect stoke ones..

99 WJ 4.7V8 Limited QTII , LPG system, 180 Tstat, Magnaflow cat, Up country coil springs, Procomp MX6 shocks absorber, ADDCO swaybars & gresonable bushings, General Grabber AT2 tires, Usa spec pa-chr11 Ipod interface.

Last edited by JMOSS; 10-01-2009 at 02:25 AM.
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