Koni rear shock for 4th gen
#1
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Koni rear shock for 4th gen
Hi.
Does anyone know if the Koni rear shock for the 4th gen (8241-1140sport) fits the third gen?
I suspect it will, but need confirmation.
Thank you.
Does anyone know if the Koni rear shock for the 4th gen (8241-1140sport) fits the third gen?
I suspect it will, but need confirmation.
Thank you.
#2
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: Koni rear shock for 4th gen
Yup, same rear suspension and floor pan (ish)
.
.
#3
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Re: Koni rear shock for 4th gen
Thank you.
So, no modification is necessary, right?
So, no modification is necessary, right?
#6
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Re: Koni rear shock for 4th gen
Thank you, guys.
I'll go for the 4th gen's.
I'll go for the 4th gen's.
#7
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Re: Koni rear shock for 4th gen
All suspension items will swap between 3rd and 4th gens in the rear. LCA, Panhard, Springs, Shocks, Sway bars, endlinks....etc.
About the only things that fit, but aren't exactly a direct fit is the Axle itself, and the parking brake cables, but those are fairly easy to take care of.
About the only things that fit, but aren't exactly a direct fit is the Axle itself, and the parking brake cables, but those are fairly easy to take care of.
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Car: 1987 IROC-Z
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Re: Koni rear shock for 4th gen
the 4th gen style Koni yellows are "ON CAR adjustable" and the 3rd gen specific ones need to be unbolted to be adjusted. that was the selling point for me. I need to adjust them if I am street cruising, drag racing, or autocrossing, so on car adjustment was key.
one version is mono tube, one is twin tube if i remember correctly. I forget now though so don't quote me on that
one version is mono tube, one is twin tube if i remember correctly. I forget now though so don't quote me on that
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Car: 86 Trans Am, 92 Firebird
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Re: Koni rear shock for 4th gen
4th gen Konis are also twin tube, 3rd gen ones are/were monotube, which is a better performing design. I cant comment on any differences in valving
#10
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Re: Koni rear shock for 4th gen
Interesting. Third gen's are better in performance than fourth gen's?
#13
Re: Koni rear shock for 4th gen
4th gen and 3rd gen Koni Yellow rears both work.
4th gen being on car adjustable
3rd gen are off car adjustable
4th gen=twin tube
3rd gen =monotube
the mono tube is the superior design, there is no arguing about it.
the monotube handles heat and Air ration better. They also have a MUCH larger Piston and valves that provide better dampening force.
As far as on car adjustment, if you are messing around with rebound settings mid race, you have completely failed and probably won't be winning any class you are racing in.
Set them to 60-70% critical dampening and leave them.
If you are oversteering, and decide to stiffen the front and soften the rear, you are LOWERING your car's maximum grip potential! You are lowering grip in the front and raising it in the rear.
the better move would be raising the rear grip with say different sway bar, roll center or spring rates.
Or better yet, rear downforce.
Pic is a shock Dyno of a 3rd gen Koni Yellow on full soft and full hard.
My math says the 1st click past full soft is correct for my Autocross 92 with 400lb rear springs
Autocross is typically in the 3in a sec range (0.07m/s)
4th gen being on car adjustable
3rd gen are off car adjustable
4th gen=twin tube
3rd gen =monotube
the mono tube is the superior design, there is no arguing about it.
the monotube handles heat and Air ration better. They also have a MUCH larger Piston and valves that provide better dampening force.
As far as on car adjustment, if you are messing around with rebound settings mid race, you have completely failed and probably won't be winning any class you are racing in.
Set them to 60-70% critical dampening and leave them.
If you are oversteering, and decide to stiffen the front and soften the rear, you are LOWERING your car's maximum grip potential! You are lowering grip in the front and raising it in the rear.
the better move would be raising the rear grip with say different sway bar, roll center or spring rates.
Or better yet, rear downforce.
Pic is a shock Dyno of a 3rd gen Koni Yellow on full soft and full hard.
My math says the 1st click past full soft is correct for my Autocross 92 with 400lb rear springs
Autocross is typically in the 3in a sec range (0.07m/s)
#14
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Thread Starter
Re: Koni rear shock for 4th gen
4th gen and 3rd gen Koni Yellow rears both work.
4th gen being on car adjustable
3rd gen are off car adjustable
4th gen=twin tube
3rd gen =monotube
the mono tube is the superior design, there is no arguing about it.
the monotube handles heat and Air ration better. They also have a MUCH larger Piston and valves that provide better dampening force.
As far as on car adjustment, if you are messing around with rebound settings mid race, you have completely failed and probably won't be winning any class you are racing in.
Set them to 60-70% critical dampening and leave them.
If you are oversteering, and decide to stiffen the front and soften the rear, you are LOWERING your car's maximum grip potential! You are lowering grip in the front and raising it in the rear.
the better move would be raising the rear grip with say different sway bar, roll center or spring rates.
Or better yet, rear downforce.
Pic is a shock Dyno of a 3rd gen Koni Yellow on full soft and full hard.
My math says the 1st click past full soft is correct for my Autocross 92 with 400lb rear springs
Autocross is typically in the 3in a sec range (0.07m/s)
4th gen being on car adjustable
3rd gen are off car adjustable
4th gen=twin tube
3rd gen =monotube
the mono tube is the superior design, there is no arguing about it.
the monotube handles heat and Air ration better. They also have a MUCH larger Piston and valves that provide better dampening force.
As far as on car adjustment, if you are messing around with rebound settings mid race, you have completely failed and probably won't be winning any class you are racing in.
Set them to 60-70% critical dampening and leave them.
If you are oversteering, and decide to stiffen the front and soften the rear, you are LOWERING your car's maximum grip potential! You are lowering grip in the front and raising it in the rear.
the better move would be raising the rear grip with say different sway bar, roll center or spring rates.
Or better yet, rear downforce.
Pic is a shock Dyno of a 3rd gen Koni Yellow on full soft and full hard.
My math says the 1st click past full soft is correct for my Autocross 92 with 400lb rear springs
Autocross is typically in the 3in a sec range (0.07m/s)
In fact, I mainly drive on street or highways and I just want to adjust damping to my farorite in those situations, enjoying change in feeling at the same time.
In this case, do you think third gen's rear is good enough, by setting it to the softest? Or even on street or highways on-car adjustment is worthy to have?
#15
Re: Koni rear shock for 4th gen
If you have a street car, use Full soft with the 3rd gen Koni shocks.
koni already have a TON of rebound force compared to stock.
I have 400lb rear springs and and setting 1 is the fastest from my Autocross testing. (Koni 3rd gen shocks have click 0,1,2,3)
soft is often faster handling wise and won't hurt ride quality
koni already have a TON of rebound force compared to stock.
I have 400lb rear springs and and setting 1 is the fastest from my Autocross testing. (Koni 3rd gen shocks have click 0,1,2,3)
soft is often faster handling wise and won't hurt ride quality
#16
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Thread Starter
Re: Koni rear shock for 4th gen
If you have a street car, use Full soft with the 3rd gen Koni shocks.
koni already have a TON of rebound force compared to stock.
I have 400lb rear springs and and setting 1 is the fastest from my Autocross testing. (Koni 3rd gen shocks have click 0,1,2,3)
soft is often faster handling wise and won't hurt ride quality
koni already have a TON of rebound force compared to stock.
I have 400lb rear springs and and setting 1 is the fastest from my Autocross testing. (Koni 3rd gen shocks have click 0,1,2,3)
soft is often faster handling wise and won't hurt ride quality
For street use, maybe no need to set the rear to 1? Setting 0 is enough?
#17
Re: Koni rear shock for 4th gen
Only reason for a street car to go beyond click 1 or 0 would be if you had 200lb+ springs or a super heavy axle.
like a 9in, 8.8, or 12 bolt.
Many Folk seem to think: Stiff =better handling
when the reality is a koni has more than enough dampening forces even on full soft.
If you look at Dyno plots of say a KYB shock, the koni has 30%+ more rebound even on full soft
like a 9in, 8.8, or 12 bolt.
Many Folk seem to think: Stiff =better handling
when the reality is a koni has more than enough dampening forces even on full soft.
If you look at Dyno plots of say a KYB shock, the koni has 30%+ more rebound even on full soft
#18
Member
Thread Starter
Re: Koni rear shock for 4th gen
Only reason for a street car to go beyond click 1 or 0 would be if you had 200lb+ springs or a super heavy axle.
like a 9in, 8.8, or 12 bolt.
Many Folk seem to think: Stiff =better handling
when the reality is a koni has more than enough dampening forces even on full soft.
If you look at Dyno plots of say a KYB shock, the koni has 30%+ more rebound even on full soft
like a 9in, 8.8, or 12 bolt.
Many Folk seem to think: Stiff =better handling
when the reality is a koni has more than enough dampening forces even on full soft.
If you look at Dyno plots of say a KYB shock, the koni has 30%+ more rebound even on full soft
What about front? Likewise 0 or 1 is enough for street?
#19
Re: Koni rear shock for 4th gen
Koni yellow front struts for our cars are a twin tube design with a dial at the top of the shaft.
it has 2 1/2 turns total for rebound
First 2 turns is calibrated
Last 1/2 turn is the wild west, that last 1/2 turn could triple rebound, that would be bad, very bad.
the koni strut most accurate between 1/2 and 1 turn
Because again, Koni yellows have a TON of dampening force already, I'd try 1/2 turn to 3/4 turn.
If you have front springs that are 850lbs rate or higher, 1 turn would work.
I run 1 1/4 turns with koni double adj RACE struts and 1,200lb springs.
koni yellows on softer settings are pretty smooth overall.
Especially when paired with solid strut mounts.
it has 2 1/2 turns total for rebound
First 2 turns is calibrated
Last 1/2 turn is the wild west, that last 1/2 turn could triple rebound, that would be bad, very bad.
the koni strut most accurate between 1/2 and 1 turn
Because again, Koni yellows have a TON of dampening force already, I'd try 1/2 turn to 3/4 turn.
If you have front springs that are 850lbs rate or higher, 1 turn would work.
I run 1 1/4 turns with koni double adj RACE struts and 1,200lb springs.
koni yellows on softer settings are pretty smooth overall.
Especially when paired with solid strut mounts.
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