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Old 05-27-2013, 12:39 AM   #1
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Coilovers going in - got questions.

So my Pedders XA coilovers are getting installed this week (Pace car package). I'll need to measure, but I am pretty sure the front of my car sits higher than the rear right now. I want to be as aggressive as I can with the stance and level it off. I anticipate 1.5 -1.75 of drop. I'm running Forgelines with Nineball's offsets, 275 up front and 315s in the rear. Anyone see an issue with that?

Right now it seems to me the stock ride was a little more "bounce" in the rear than the front. I'd like to tame that. What settings are recommended on the coilovers to maintain stock ride feeling (or slightly stiffer if need be) while still dialing up the performance?

Any other thoughts, comments, or things you'd do different if you were doing it all over?
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Old 05-27-2013, 01:06 AM   #2
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Old 05-27-2013, 12:21 PM   #3
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Good luck. Not knocking the Pedders XA's, but I couldn't get mine dialed in no matter what setting I tried.
There was either too much bounce or the ride was overly firm and squirrelly. During aggressive driving (road course) my car never felt planted. And yes, I had the bushings timed and alignment done twice by a skilled performance shop just to be sure that wasn't the issue.

I eventually put the stock suspension back on my car.

I'm now looking for a more easily tuned coilover setup. I've heard Pedders supercar coilovers offer a better ride and more control.
The basic Pedders XA just didn't offer the control or ride quality I was looking for.
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Old 05-27-2013, 05:07 PM   #4
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Good luck. Not knocking the Pedders XA's, but I couldn't get mine dialed in no matter what setting I tried.
There was either too much bounce or the ride was overly firm and squirrelly. During aggressive driving (road course) my car never felt planted. And yes, I had the bushings timed and alignment done twice by a skilled performance shop just to be sure that wasn't the issue.

I eventually put the stock suspension back on my car.

I'm now looking for a more easily tuned coilover setup. I've heard Pedders supercar coilovers offer a better ride and more control.
The basic Pedders XA just didn't offer the control or ride quality I was looking for.
Man, I hope I have a better experience than that. Truth is I think it rides pretty good stock. I just want to take it up a notch improving the performance and get her dropped.

Man I will not be happy if I spend all that money on the install, and then have to pay it again to go back to stock . I know I could recoupe on the coliovers, but not the labor - nor the frustration. I assume you contacted Pedders about your disatisfaction? Pete has been great helping me out thus far - I have no complaints about that.
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Old 05-27-2013, 05:14 PM   #5
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Depending how the roads are where you live (pot holes, etc.) you may not want to drop the front 1.75". It's also good to remember that the rear cradle bushings will raise the rear end just a hair.

I have mine set at 14/16 for daily driving.
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Old 05-27-2013, 11:04 PM   #6
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Old 05-27-2013, 11:08 PM   #7
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Depending how the roads are where you live (pot holes, etc.) you may not want to drop the front 1.75". It's also good to remember that the rear cradle bushings will raise the rear end just a hair.

I have mine set at 14/16 for daily driving.
Coilover valving depends on other things like tire size, pressure , road condition and what the user finds comfortable.
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Old 05-27-2013, 11:13 PM   #8
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Old 05-27-2013, 11:16 PM   #9
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Coilover valving depends on other things like tire size, pressure , road condition and what the user finds comfortable.
Very good point.
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Old 05-27-2013, 11:40 PM   #10
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Very good point.
My front coilover setting didn't go so well with the stock 20x8s with Pirellis but the 19x9.5" and 275-40-19s Hankook V12 evos inflated to 42psi is the bees knees LOL. Side wall of these Hankooks is too soft but the center tire section is firmer than the stock Pirellis. The overall result is a well balanced, neutral cornering feel and firm not harsh like the Pirellis feel over bumps. So the car stays flat but still compliant over severe bumps.
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Old 05-28-2013, 02:01 AM   #11
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So I was searching posts and Pete had recommended 16 off full hard front, and 8 off full hard rear. Seems like there has been some confusion about the numbers regarding counting up from softest, or down from hardest. What are you guys doing? The range is 30 (hardest) to 0 softest?

Okay - just found this also from Pete - LOL, so now I don't know where to start ...

Highlights from the 160086 Instructions

Rear Coil Pre-Load 10mm

Adjustment Starting Setting from Full Soft
Comfort Front 6 Rear 3
Street Sport Front 12 Rear 6
Sport Front 15 Rear 18
Road Course Front 18 Rear 28
Drag Front 3 Rear 16

Last edited by IPT; 05-28-2013 at 03:22 AM.
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Old 05-28-2013, 07:15 AM   #12
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30 is full hard.
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Old 05-28-2013, 08:29 AM   #13
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I've got basically the same size and tire setup that L99cama2011 does and I've been running 12 front 10 rear on the street, and 20 front 14 rear on the track but now that I've seen what IPT posted about Pete's recommendations I'm a bit mystified about his road course settings. Are you sure he recommended 18 front and 28 rear? It wasn't the other way around; 28 front and 18 rear??

Do you have the link for his recommendations?
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Old 05-28-2013, 10:27 AM   #14
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I know that pedders reccomends 10mm's of preload but I think that is way too much and it reduces the effectivness of the dampening. The result is an uncontrolably bouncing ride or a very stiff ride because you have to max out the dampers to the point where they are no longer allowing enough rebound and compression.

... and yes I am aware you need to time the factory bushings after you change the ride height.
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Old 05-28-2013, 10:52 AM   #15
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The issue of XA settings came up in the latest GM High Tech Magazine.

GM High Tech Mag put Pedders XA coilovers and Nitto NT05R tires on their shop car and it ran slower (on average) than it did stock around the road course. They admitted they needed more time to try to dial in the coilover settings. But the fact that the car felt unstable and ran slower than stock proves a major point. You can't just throw XA coils on your car and expect it to perform better than stock.


I really don't think the basic XA coils are the best setup for a serious racer. They'll will work fine for someone wanting to lower their vehicle for daily driving, but I'd invest in something else if you're really into road course type racing.
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Old 05-28-2013, 11:58 AM   #16
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Quote:
Originally Posted by jeremywes View Post
I know that pedders reccomends 10mm's of preload but I think that is way too much and it reduces the effectivness of the dampening. The result is an uncontrolably bouncing ride or a very stiff ride because you have to max out the dampers to the point where they are no longer allowing enough rebound and compression.

... and yes I am aware you need to time the factory bushings after you change the ride height.
What did you go with for your preload?
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Old 05-28-2013, 12:52 PM   #17
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I've got basically the same size and tire setup that L99cama2011 does and I've been running 12 front 10 rear on the street, and 20 front 14 rear on the track but now that I've seen what IPT posted about Pete's recommendations I'm a bit mystified about his road course settings. Are you sure he recommended 18 front and 28 rear? It wasn't the other way around; 28 front and 18 rear??

Do you have the link for his recommendations?
Man, I looked at so many I'm not sure exactly what thread it was grabbed that from. I'll take a look after work and see if I can find it again.
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Old 05-28-2013, 02:03 PM   #18
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What did you go with for your preload?
I used zero preload (the first point that does not allow vertical movement in the spring) with pedders XA 2.5" springs on Megan racing coil overs.
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Old 05-28-2013, 02:33 PM   #19
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I used zero preload (the first point that does not allow vertical movement in the spring) with pedders XA 2.5" springs on Megan racing coil overs.
Is it possible to change preload without removing the coil over?
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Old 05-28-2013, 05:53 PM   #20
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Is it possible to change preload without removing the coil over?
Yes absolutely! The preload is adjusted by the two lower nuts below the spring base and the ride height is adjusted by screwing the whole damper cartridge up and down in the strut housing.

You can even experiment with track specific settings by loading one side. Or front and rear balance to match track rotation etc. there are some really good books on the subject like "speed secrets"
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Old 05-28-2013, 09:38 PM   #21
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I've got basically the same size and tire setup that L99cama2011 does and I've been running 12 front 10 rear on the street, and 20 front 14 rear on the track but now that I've seen what IPT posted about Pete's recommendations I'm a bit mystified about his road course settings. Are you sure he recommended 18 front and 28 rear? It wasn't the other way around; 28 front and 18 rear??

Do you have the link for his recommendations?
Neutral or oversteer keep the rear setting stiffer than the front, if you want to add in understeer then bringing the front setting closer to the rear is the answer. The range of adjustments is wide as J Lo $#$$%#%. My Eibachs suck but handle great and has a huge range of ERS or Hyperco springs to make my car handle how I want. Also remember that you can use tire pressure to further alter the balance or even make the ride more compliant.
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Old 05-28-2013, 09:47 PM   #22
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Originally Posted by SGOS252382 View Post
The issue of XA settings came up in the latest GM High Tech Magazine.

GM High Tech Mag put Pedders XA coilovers and Nitto NT05R tires on their shop car and it ran slower (on average) than it did stock around the road course. They admitted they needed more time to try to dial in the coilover settings. But the fact that the car felt unstable and ran slower than stock proves a major point. You can't just throw XA coils on your car and expect it to perform better than stock.


I really don't think the basic XA coils are the best setup for a serious racer. They'll will work fine for someone wanting to lower their vehicle for daily driving, but I'd invest in something else if you're really into road course type racing.
Ha Ha Ha. Actually it goes deeper than that. Pedders XA are not bad at all. Here is the thing and it is why I just bought the Pirelli 295-35-20 a few days ago to replace the Nitto NT05. Nitto NT05 are really you get what you pay for tire and is W rated(168mph). I had to pump the Nittos to 48 psi in order to match the Pirellis 36 psi. You can't put stiff coilovers on a car and then put soft sidewall tires on the car and expect the car to perform well. My car now with the stiff Eibach R1 are no longer the weak point like the stock suspension, the Nitto NT-05s are. For drag racing good tire, for road course on a 3800lb car with stiff is heck coilover setting not good. If you are running stiff track like coilover settings you also need a tire that can handle the pressure because as the suspension gets stiffer the tire becomes the weak point , that's why the car GM used handled worse than stock but if they had put a DOT rated tire on the car like a Hoosier brand tire then the results would've slaughtered the stock time. This is the exact same issue I am now having and is why my front Hankook tires are on their way off my front rims as well as the Nitto NTO5s. Michelin Super Sports are on their way in.
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Old 05-28-2013, 10:08 PM   #23
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NT05 and NT05Rs are different. R's are for drag with soft sidewalls.

You'd think the reviewers would know that. Not to say the NT05 is all that... But good bargain for autoX.
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Old 05-29-2013, 01:10 AM   #24
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NT05 and NT05Rs are different. R's are for drag with soft sidewalls.

You'd think the reviewers would know that. Not to say the NT05 is all that... But good bargain for autoX.
Yup NT05Rs are softer. I still think NT05 street are still too soft as well, that's why I am taking them off.
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Old 05-29-2013, 01:46 AM   #25
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Yup NT05Rs are softer. I still think NT05 street are still too soft as well, that's why I am taking them off.
I need to run them at 45 psi for autox. Looking at pilot SS, but now Rivals as next tire. Btw, running XAs at 14 and 10. Have stiffer springs due to FI weight up front.

Last edited by sting808; 05-29-2013 at 02:18 AM. Reason: Typo
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