EB coilover rates - Pirate4x4.Com : 4x4 and Off-Road Forum

braxton357 · 10-28-2009, 02:45 PM

So I've been searching and reading for days about bronco weights and spring rates and still haven't made up my mind. I've never weighed my eb and it's sitting on jackstands at the moment so it would be pretty hard but I'll give the general specs if anyone has an idea. efi 5.8/c4/d20 , light front bumper, light winch w/synthetic rope, al radiator and a steering box up front. 14 gallon fuel cell in the rear, batt in the rear, no top but quite a few tools. Bronco has most of it's body and quite a bit of tube, so I'm guessing high 4000's? Drivetrain is d44/9" with beadlocked 36's.

Now the question...I'm running 2.5 16" travel coilovers in the front with 4" airbumps and 14" coilovers with timbrens and a swaybar in the rear. Plan on going fast with it eventually and want to know what people recommend for dual rate spring rates front and rear? Already have 350 over 450 springs for the front but am thinking that's too stiff?
Was thinking 350 over 200 for the front and 250 over 150 for the rear. Anyone see any problems with this? Should I go softer? Street driving isn't an issue.

soylent_green · 10-28-2009, 03:16 PM

I would guess that you're at the high end of the 4000's for weight.

That said, I think I would come up with the same numbers for coil rates as you did.

almostthere · 10-28-2009, 07:50 PM

The bronco in my sig has 2.5x16's with 250's/150's in the rear and 500's/150's in the front and seems to do well sitting with about 5" of up travel at ride height.

braxton357 · 10-28-2009, 09:10 PM

Quote:

Originally Posted by almostthere

The bronco in my sig has 2.5x16's with 250's/150's in the rear and 500's/150's in the front and seems to do well sitting with about 5" of up travel at ride height.

I try and refrain from looking at pictures of your bronco. It makes me want to cut mine up too much. Trying to keep it light.

Any reason why you went with such a huge step up on the front shock (150-500)? Looks like going with 200's over 350s would give me close to the same primary rate. Am looking for about 6-7" of uptravel myself. How does yours do at speed?

almostthere · 10-29-2009, 07:20 AM

I went with what the guys at offroad engineering advised and have been pretty happy. It does pretty well at moderate speed, it doesn't see much faster than 45 often. They dont ever really bottom out no matter how big the hit is. I probably need to try some different springs just to see, this is my first experience with coilovers.

10-28-2009, 02:45 PM	#1 (permalink)
braxton357 Zeus of the Sluice Join Date: Nov 2002 Member # 14685 Location: morganton/charlotte,nc Posts: 4,557	EB coilover rates So I've been searching and reading for days about bronco weights and spring rates and still haven't made up my mind. I've never weighed my eb and it's sitting on jackstands at the moment so it would be pretty hard but I'll give the general specs if anyone has an idea. efi 5.8/c4/d20 , light front bumper, light winch w/synthetic rope, al radiator and a steering box up front. 14 gallon fuel cell in the rear, batt in the rear, no top but quite a few tools. Bronco has most of it's body and quite a bit of tube, so I'm guessing high 4000's? Drivetrain is d44/9" with beadlocked 36's. Now the question...I'm running 2.5 16" travel coilovers in the front with 4" airbumps and 14" coilovers with timbrens and a swaybar in the rear. Plan on going fast with it eventually and want to know what people recommend for dual rate spring rates front and rear? Already have 350 over 450 springs for the front but am thinking that's too stiff? Was thinking 350 over 200 for the front and 250 over 150 for the rear. Anyone see any problems with this? Should I go softer? Street driving isn't an issue. __________________ In vino veritas 70 turbocharged 351w fastback mustang 73 linked 5.8efi Bronco 99 QCLB 4x4 twin'd cummins on meth.

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10-28-2009, 03:16 PM	#2 (permalink)
soylent_green Registered User Join Date: Apr 2008 Member # 112072 Location: Lindstrom, MN Posts: 30	I would guess that you're at the high end of the 4000's for weight. That said, I think I would come up with the same numbers for coil rates as you did.

10-28-2009, 07:50 PM	#3 (permalink)
almostthere Wheeler Join Date: Apr 2005 Member # 45521 Location: Chattanooga, TN Posts: 267	The bronco in my sig has 2.5x16's with 250's/150's in the rear and 500's/150's in the front and seems to do well sitting with about 5" of up travel at ride height.

10-29-2009, 07:20 AM	#5 (permalink)
almostthere Wheeler Join Date: Apr 2005 Member # 45521 Location: Chattanooga, TN Posts: 267	I went with what the guys at offroad engineering advised and have been pretty happy. It does pretty well at moderate speed, it doesn't see much faster than 45 often. They dont ever really bottom out no matter how big the hit is. I probably need to try some different springs just to see, this is my first experience with coilovers.