Front Swaybar upgrade for Evo IX?
#31
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i'm thinking of install FSB over the winter. i should have done it last winter when the engine was out but i was building the car for TTA and didn't have the point. and i didn't know it would be that much work to install one, so though i could install one down the road.
i had a SmallFortuneRacing blade style FSB for my s2000. wonder if this style of FSB would make it easier to install. i know the cross tube is straight and not bent like oem one.
i had a SmallFortuneRacing blade style FSB for my s2000. wonder if this style of FSB would make it easier to install. i know the cross tube is straight and not bent like oem one.
Last edited by honda-guy; Nov 11, 2011 at 03:38 AM.
#33
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i'm thinking of install FSB over the winter. i should have done it last winter when the engine was out but i was building the car for TTA and didn't have the point. and i didn't know it would be that much work to install one, so though i could install one down the road.
i had a SmallFortuneRacing blade style FSB for my s2000. wonder if this style of FSB would make it easier to install. i know the cross tube is straight and not bent like oem one.
i had a SmallFortuneRacing blade style FSB for my s2000. wonder if this style of FSB would make it easier to install. i know the cross tube is straight and not bent like oem one.
Thanks, Smike. Gonna look into the Whiteline today.
#34
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If you want to get rid of the understeer, I highly recommend getting an upgraded rear diff from Shep Racing or TRE or someone.
I can get the rear to step out slightly at 80mph under WOT with 255 A6's and I've got stock front and stock rear swaybars! Shep Racing 1.5 way rear diff is awesome!
I can get the rear to step out slightly at 80mph under WOT with 255 A6's and I've got stock front and stock rear swaybars! Shep Racing 1.5 way rear diff is awesome!
Next season i just picked up the whiteline front sway bar so ill let you know how it feels on the track.
#36
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Do it while the subframe is down if you can afford it. With the subframe dropped it is probably a 15 minute job to make the change.
#37
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IMO if you're going to go through the trouble of installing a FSB, then get an adjustable one. H&R makes one (which I run) and I believe Robispec also sells one.
l8r)
l8r)
#38
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Robi-spec bar doesn't have enough stiffness IMO. Its soft setting is softer than stock and stiff setting is only like 10% more than stock.
I just re-did the numbers for re-drilling the FSB and the stiffness change is actually on the order of 20% stiffer based on the best info I could find. If I remember, Ill measure the bar myself tonight and refine the numbers.
If you want to check it your self, based off Fred Puhns sway bar stiffness equation, the change in stiffness change is:
x = ( 1.875 * A^2 * B + A^3 )
( 1.875 * (A-L)^2 * B + (A-L)^3 )
For now this is assuming the angle of lever arm is negligible, which it actually isn't but I didn't have my bar to measure since I'm at work (Shhh )
So the variables,
A = Lever arm
B = Base length of the bar
L = Change in the center of the hole.
For 20% I used A = 9, B = 40, and L = 0.75.
Conversely, if you have a larger diameter bar with the same leg length then the equation for stiffness change is:
x = (d2)^4 / (d1)^4
Changing from a stock 24mm to the whiteline 26mm (again, assuming the leg length is the same which I have NOT verified), then the stiffness change is on the order of 37%.
I just re-did the numbers for re-drilling the FSB and the stiffness change is actually on the order of 20% stiffer based on the best info I could find. If I remember, Ill measure the bar myself tonight and refine the numbers.
If you want to check it your self, based off Fred Puhns sway bar stiffness equation, the change in stiffness change is:
x = ( 1.875 * A^2 * B + A^3 )
( 1.875 * (A-L)^2 * B + (A-L)^3 )
For now this is assuming the angle of lever arm is negligible, which it actually isn't but I didn't have my bar to measure since I'm at work (Shhh )
So the variables,
A = Lever arm
B = Base length of the bar
L = Change in the center of the hole.
For 20% I used A = 9, B = 40, and L = 0.75.
Conversely, if you have a larger diameter bar with the same leg length then the equation for stiffness change is:
x = (d2)^4 / (d1)^4
Changing from a stock 24mm to the whiteline 26mm (again, assuming the leg length is the same which I have NOT verified), then the stiffness change is on the order of 37%.
#39
EvoM Guru
iTrader: (1)
i'm thinking of install FSB over the winter. i should have done it last winter when the engine was out but i was building the car for TTA and didn't have the point. and i didn't know it would be that much work to install one, so though i could install one down the road.
i had a SmallFortuneRacing blade style FSB for my s2000. wonder if this style of FSB would make it easier to install. i know the cross tube is straight and not bent like oem one.
i had a SmallFortuneRacing blade style FSB for my s2000. wonder if this style of FSB would make it easier to install. i know the cross tube is straight and not bent like oem one.
#40
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i'm thinking of install FSB over the winter. i should have done it last winter when the engine was out but i was building the car for TTA and didn't have the point. and i didn't know it would be that much work to install one, so though i could install one down the road.
i had a SmallFortuneRacing blade style FSB for my s2000. wonder if this style of FSB would make it easier to install. i know the cross tube is straight and not bent like oem one.
i had a SmallFortuneRacing blade style FSB for my s2000. wonder if this style of FSB would make it easier to install. i know the cross tube is straight and not bent like oem one.
I have the whiteline FSB & Perrin RSB. Both are set to full soft. I didn't notice much of a difference after the FSB was installed. the rear bar made the most noticable difference IMO, but I agree with Nate that the TRE was the best mods to eliminate understeer all together.
I'm going back to OEM suspension over the winter and I'm going to try to use the adjustability of the sways to tune the roll stiffness of the car.
#43
Evolved Member
So the general consensus is that I should upgrade to the 25mm swaybar versus the stock?
Yes, at some point when I get the money, I will upgrade the rear differential to the 12 plate; that's a no brainer. I'm just wondering about the front swaybar for now. Thanks for all of your input!
Yes, at some point when I get the money, I will upgrade the rear differential to the 12 plate; that's a no brainer. I'm just wondering about the front swaybar for now. Thanks for all of your input!
I'm going with the GTWorx must have basics. Bilstien HDs, GTWorx Springs, Rear Bar, Rear Trailing Arm Bushings and Bump Steer Kit. And a TRE Diff ASAP.
I'll see how that is before thinking about anything else.
#44
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Originally Posted by Rmeister007
So the general consensus is that I should upgrade to the 25mm swaybar versus the stock?
Yes, at some point when I get the money, I will upgrade the rear differential to the 12 plate; that's a no brainer. I'm just wondering about the front swaybar for now. Thanks for all of your input!
Yes, at some point when I get the money, I will upgrade the rear differential to the 12 plate; that's a no brainer. I'm just wondering about the front swaybar for now. Thanks for all of your input!
I'm thinking why bother with designing a setup around an open diff in the rear, only to have it change with the diff upgrade? I think it makes sense to plan around the Diff upgrade from the beginning or even get it first and then get the rest of the stuff based on that.
I'm going with the GTWorx must have basics. Bilstien HDs, GTWorx Springs, Rear Bar, Rear Trailing Arm Bushings and Bump Steer Kit. And a TRE Diff ASAP.
I'll see how that is before thinking about anything else.
I'm going with the GTWorx must have basics. Bilstien HDs, GTWorx Springs, Rear Bar, Rear Trailing Arm Bushings and Bump Steer Kit. And a TRE Diff ASAP.
I'll see how that is before thinking about anything else.
1. stock KYB suspension - understeering pig
2. TRE rear diff - car handled very neutral
3. Bilstein/Swift spec-r - car still neutral, much better ride than stock, less body roll
4. Perrin psrs, front LSD, front bar - less body roll, still neutral, turn in feels different with the added caster
5. Works rear bar - set to softest setting - noticeable increase in rear end response after initial turn in, can get power oversteer if I want
So based on my experience, I would caution the OP about running a larger rear bar, esp.on full stiff with an upgraded rear diff. You're going to have a tail happy car. I ended up getting a Works rear because I got a great deal on a used one with Perrin mounts and endlinks. If I were to go new I'd go with a Swift rear bar based on Smike's driving impressions.
l8r)
#45
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I'm thinking why bother with designing a setup around an open diff in the rear, only to have it change with the diff upgrade? I think it makes sense to plan around the Diff upgrade from the beginning or even get it first and then get the rest of the stuff based on that.
I'm going with the GTWorx must have basics. Bilstien HDs, GTWorx Springs, Rear Bar, Rear Trailing Arm Bushings and Bump Steer Kit. And a TRE Diff ASAP.
I'll see how that is before thinking about anything else.
I'm going with the GTWorx must have basics. Bilstien HDs, GTWorx Springs, Rear Bar, Rear Trailing Arm Bushings and Bump Steer Kit. And a TRE Diff ASAP.
I'll see how that is before thinking about anything else.
Besides my car already oversteers and has gentle understeer with full throttle. I can already drift it (and spin out ) on a dry track with hankook RS3s. This is all road course though.