Anyone running DIY Coilovers?
11-19-2013, 12:20 AM
Post: #1
Anyone running DIY Coilovers?
Hi,

Is anyone running DIY coilovers? What's your spec?

I'm planning to buid mine and until now the choices i made are the following:
- TRD shocks front and rear (48511-AE881 & 48531-AE881), 188 mm stroke
- Eibach Springs 39 N/mm or 44 N/mm, 8" (203 mm) or 9" (228 mm) long, 57 mm ID (2,25")
- Helper springs

It's about the springs that i have some doubts because i can only use 39 N/mm rate with 8" long (or 44 N/mm). With 9" long i can only use 44 N/mm rate.

Are 8" length springs long enough or should i go to 9" with 44 N/mm (Frequency will go higher of course)?

Thank you for your help.

Keeping the AE86 alive!
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11-19-2013, 12:52 AM
Post: #2
Anyone running DIY Coilovers?
I'm running AE86 suspension on my KE20 with 2T-G (910kg curb weight).

- Tokico HTS short stroke inserts on shortened housings.
- RallyDesign springs 325 Rate (google tells me, this should be 4,4 kg/mm), 10,5" Free Length, they are quite long, as i have the threaded bit sitting a bit low on the housing, because i was afraid of damaging the threads for the gland nut.

[Image: AEU86 AE86 - Anyone running DIY Coilovers?]

If you can get the threaded bit a bit more upwards then i did, i'd say 8" springs would be good enough, otherwise a set of springs from RallyDesign (2,25" inner diameter) is 30 pound.

I'm running without helper springs.

"It's all about the heart, the people who focus on parts, turbo's and all that stuff...they're just losers."
-Shinji Minowa
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11-19-2013, 11:16 AM
Post: #3
Anyone running DIY Coilovers?
Thanks.

About your spring rate i think it's higher than 4,4 Kg/mm.

1 lb = 0,45359237 kg
1 in = 25,4 mm

0,45359237 / 25,4 = .017857967322834645669291338582677

So 1 lb/in = 0,017857967322834645669291338582677 kg/mm.

325 lb/in = 5,8 kg/mm

Anyone else has DIY coilovers?

Keeping the AE86 alive!
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11-19-2013, 11:18 AM
Post: #4
Anyone running DIY Coilovers?
Teach a man how to fish etc..

http://performance-suspension.eibach.com..._worksheet

MotionRatio (MR): 1
ACF-front: 0.99
MR rear:
d3(shocks/coilovers) =1135
d3(spring-perches) = 900
d4 = ~1345

That should be enough to get this thing figured out.

A wheel to steer the front of the car
A pedal to steer the rear
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11-19-2013, 05:40 PM
Post: #5
Anyone running DIY Coilovers?
Hi NoHachi,

I've already made some calculations and read your old post about suspension.
I'm using the unsprung weight values you wrote somewhere (35Kg/side at front and 100 Kg at the rear).

What D3 do you use? I'm using the spring ones, not the shocks...

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11-19-2013, 06:17 PM
Post: #6
Anyone running DIY Coilovers?
Rasteirinho Wrote:Thanks.

About your spring rate i think it's higher than 4,4 Kg/mm.

1 lb = 0,45359237 kg
1 in = 25,4 mm

0,45359237 / 25,4 = .017857967322834645669291338582677

So 1 lb/in = 0,017857967322834645669291338582677 kg/mm.

325 lb/in = 5,8 kg/mm

Anyone else has DIY coilovers?

ah yes, you're right... I always mix lb/ft and lb/in in this situation Smile

"It's all about the heart, the people who focus on parts, turbo's and all that stuff...they're just losers."
-Shinji Minowa
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11-19-2013, 10:04 PM
Post: #7
Anyone running DIY Coilovers?
Rasteirinho Wrote:Hi NoHachi,

I've already made some calculations and read your old post about suspension.
I'm using the unsprung weight values you wrote somewhere (35Kg/side at front and 100 Kg at the rear).

What D3 do you use? I'm using the spring ones, not the shocks...

You use the D3 value that is correct for your springs.. when running rear coilovers use the one where the shocks (and now also the springs) attach.

A wheel to steer the front of the car
A pedal to steer the rear
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11-19-2013, 10:30 PM
Post: #8
Anyone running DIY Coilovers?
Your TRD front dampers will work really nicely with 225lb springs
and something like 190lb rears.

An analogue brain in a digital World
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