Evo Bolt on coil over spring rates for 392 V8

marcus37

marcus37

New member
I have a Evo Long Arm setup with bolt on coil overs , UD 60 axles with 40" tires.
Last year I had a 392 V8 conversion done and have been trying to dial in the spring rates.
My ride height at around 3" of lift. I added HD springs up front on the lowers (400lb springs)
and now my have a rake in the front at zero preload setting. I was wondering what custom spring rates
people are running?

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@marcus37 I’m running their kit in the JT and after the hemi swap I went to 300/350 with an inch of preload. Currently sitting a little over 4.5 inches of lift.

honestly if your wanting to come down in hight. I would go with a lighter spring rate so you can add in more preload and have more adjustability with ride hight.

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Lperdue said:
@marcus37 I’m running their kit in the JT and after the hemi swap I went to 300/350 with an inch of preload. Currently sitting a little over 4.5 inches of lift.

honestly if your wanting to come down in hight. I would go with a lighter spring rate so you can add in more preload and have more adjustability with ride hight.

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Nice setup! Thank you for the feedback if dropped the lower front spring down that would help on the preload maybe run a 300lb spring
 
marcus37 said:
I have a Evo Long Arm setup with bolt on coil overs , UD 60 axles with 40" tires.
Last year I had a 392 V8 conversion done and have been trying to dial in the spring rates.
My ride height at around 3" of lift. I added HD springs up front on the lowers (400lb springs)
and now my have a rake in the front at zero preload setting. I was wondering what custom spring rates
people are running?
Click to expand...
I'm pretty sure 14" 400s IS what you want to be running for your secondaries with a 392. What are your primaries? Also, nothing wrong with adding in a bit of preload.
 
wayoflife said:
I'm pretty sure 14" 400s IS what you want to be running for your secondaries with a 392. What are your primaries? Also, nothing wrong with adding in a bit of preload.
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That makes sense, I never knew what spring rates EVO went with for the 392. Do you know what upper rates they use?
 
Lperdue said:
That makes sense, I never knew what spring rates EVO went with for the 392. Do you know what upper rates they use?
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I just talked to Mel about this yesterday. I believe he said he's running 200/400. Not sure what the rears were unfortunately. He said that he purposefully made his 392 have a taller stance and found that it offered a better ride. And, as luck would have it, I got to test it out and can confirm as much.
 
wayoflife said:
I just talked to Mel about this yesterday. I believe he said he's running 200/400. Not sure what the rears were unfortunately. He said that he purposefully made his 392 have a taller stance and found that it offered a better ride. And, as luck would have it, I got to test it out and can confirm as much.
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Was that just on the front? Or did he change the rear as well.

disregard, I need to read better.
 
wayoflife said:
I just talked to Mel about this yesterday. I believe he said he's running 200/400. Not sure what the rears were unfortunately. He said that he purposefully made his 392 have a taller stance and found that it offered a better ride. And, as luck would have it, I got to test it out and can confirm as much.
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I can see that especially since you don’t have as much up travel due to engine clearance. A little taller lift would give the suspension room to cycle.
 
Disciple Off Road said:
Was that just on the front? Or did he change the rear as well.

disregard, I need to read better.
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LOL - Give Andrew a call. I'm pretty sure this is how they're going to be selling it now for 392s.
Lperdue said:
I can see that especially since you don’t have as much up travel due to engine clearance. A little taller lift would give the suspension room to cycle.
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Yes, this exactly. There is a lot more room for the springs to do their job instead of just relying on the shocks. It offers a nicer ride and I hit some pretty big cutouts without bottoming out.
 
wayoflife said:
LOL - Give Andrew a call. I'm pretty sure this is how they're going to be selling it now for 392s.

Yes, this exactly. There is a lot more room for the springs to do their job instead of just relying on the shocks. It offers a nicer ride and I hit some pretty big cutouts without bottoming out.
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With a 200 spring rate I would imagine it’s pretty plushy on road until you get into the secondaries. Any idea on the spacing between the slider and the stop nut.
 
Lperdue said:
With a 200 spring rate I would imagine it’s pretty plushy on road until you get into the secondaries. Any idea on the spacing between the slider and the stop nut.
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Yup, you always are riding on both springs and 200/400 = about 133 for daily driving. Basically, pretty plush. I didn't look but if I could guess, the timing rings are set about an inch or so above the slider up front.
 
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