The 913 Experiment

[rickshaw]

There seems to be a lot of mystery surrounding the OME 913's Lift Springs. When compared to the more common OME 912's. Some say the 913 is taller, some say the 913 is shorter and some say the 912 and the 913 are the same with different spring rates. I'm going to put all that to rest by being the guinea pig. I found this thread OME 912 vs. 913...what's the difference?!? was somewhat helpful in the fact that the 913 was shorter.

I recently had new wheels and tires installed, Nitto Terra Grapplers 285/60/18. The tire place cranked the torsion bars about 2" to get tires to fit. I couldn't tell you how many turns on the torsions because the tire shop did that. With the front end lifted and aligned, the rear sat way too low. Now my challenge was to lift the rear to have a proper stance.

I had originally planned for a larger lift so I previous purchased OME 912's. The next day I installed the 912's which looked OK but was a bit too high when compared to the front. Then I tried the Spring Spacers on the Stock Springs. It was too low, needed something in between. Thats when I tried the 913's. Below is some measurements I made that may help someone else.

Instructions for installing OME Rear Coil Springs
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The Experiment: Comparing different lift options


Set of Old Man Emu 912 & 913 Springs



Set of Daystar Spring Spacers - KC09103BK
(94-08 Dodge 1500-3500 2WD)
1 1/2 in. Front Budget Boost
Actual measurement of spacer is only 1 in. not 1 1/2 in. as stated on box

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Base measurements with Stock Springs:
with Nitto Terra Grapplers 285/60/18 (Diameter 31.38 in)

Front:
Gap between tire and cladding: 5 3/4 in.
Distance from floor to edge of cladding: 36 1/4 in.

Rear:
Gap between tire and cladding: 4 1/2 in.
Distance from floor to edge of cladding: 35 in.


The front lifted and aligned, the rear with Stock Springs

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Spring measurements:

Stock Springs
measured height: 15 1/2 in.
measured spring wire diameter: 10.8 mm.

OME 913 Springs
measured height: 15 1/2 in.
measured spring wire diameter: 15 mm.

OME 912 Springs
measured height: 16 1/2 in.
measured spring wire diameter: 15 mm.

Daystar Spring Spacers - KC09103BK
Actual measurement of spacer is 1 in.



Stock & OME 913 are the same height, OME 912 measures 1 in. taller

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Experiment #1
Daystar Spring Spacers on stock springs
Gap between tire and cladding: 5 1/2 in.
Distance from floor to edge of cladding: 36 in.


Test with Daystar Spring Spacer on Stock Spring & OME 912

Daystar Spring Spacers on stock springs
with stock spring isolator inserted
Gap between tire and cladding: 5 3/4 in.
Distance from floor to edge of cladding: 36 1/4 in.


Stock spring isolator fits nicely into the Daystar Spring Spacer, added an extra 1/4 in.

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Experiment #2
Set of OME 913's
with stock spring isolators
Gap between tire and cladding: 6 1/4 in.
Distance from floor to edge of cladding: 36 3/4 in.

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Experiment #3
Set of OME 912's
with stock spring isolators
Gap between tire and cladding: 7 in.
Distance from floor to edge of cladding: 37.5 in.



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Rear Lift Test Conclusion:

Lift with Daystar Spring Spacers on stock springs: 1 in. lift

Lift with Daystar Spring Spacers on stock springs with stock spring isolators: 1 1/4 in. lift

Lift with OME 913's with stock spring isolators 1 3/4 in. lift

Lift with OME 912's with stock spring isolators: 2 1/2 in. lift


The 913's gave me the stance I was looking with a very slight forward rake

I drove around with the 912's for 2 weeks before I installed the 913's. The 913's seems to ride stiffer than the 912's, the 912's felt softer and the 913's has less body roll in turns.

The Daystar Spring Spacers were less than half the price of the 1 in. Independent 4X Spring Spacers.

The Spring install is very easy to do. I counted 7 times I changed out the Springs to do these tests. got it down to 15 min. a side.

I ended up selling the 912's and Spring Spacers to "Jofotz"

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Some other rear lift possibilities, better left for someone else to test.

OME 919's

Other Daystar Spring Spacers

Prothane Spring Spacers

Independent 4X Spring Spacers (I wonder who really makes these, Daystar?)

Any Spring Spacer that fits (94-08 Dodge 1500-3500 2WD)

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Sources I used:

OME 912 and OME 913
http://www.davesport.com/

Daystar Spring Spacers - KC09103BK
http://www.amazon.com/

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Additional Info:

OME913
Free Height: 390 mm., 15.35 in.
Number of Coils: 9.3
lbf/in spring rate: 180-300
Application: (medium Amigo/Rodeo 5door coil spring 98-02)
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OME912
Free Height: 420 mm., 16.54 in.
Number of Coils: 10.8
lbf/in spring rate: 180-300
Application: (medium load Trooper 92-02)
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OME919
Free Height: 430 mm., 16.93 in.
Number of Coils: 10.8
lbf/in spring rate: 200-280
Application: (heavy load Trooper 92-02)
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Source: OME 912 vs. 913 post #9

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Source: ARB Application Guide

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The final result with OME 913's

I hope this answers some questions about the OME 913's.
rickshaw