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Spring rate help?

Originally Posted by FL 4Motion I'm a little intimidated to even ask a ? In this thread but I figure this is the brst place to ask so here goes...

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Old 08-19-2014, 06:49 PM   #1 (permalink)
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Default Any inputs on my suspension plans? Thanks

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Originally Posted by FL 4Motion View Post
I'm a little intimidated to even ask a ? In this thread but I figure this is the brst place to ask so here goes...

Wife just got back from Roebling track event. Complained of really bad understeer.

Car is a nismo on oem suspension with oem sized tires 245/40 19 front and 285/35 19 rears. Wheel offsets are +22 front and +12 rear.

Goal is to have a neutral balanced car, not too loose and eliminate the understeer.

Tires are michelin PSS and car is semi dd so we will be staying with street tires so PSS, re-11 etc type tires.

Based on my feeble understanding from reading this, stepping up to 275/35 fronts and maybe also the Hotchkis front bar (keep oem rear bar) will be good first step?

Next year plan to upgrade to swift spec r springs and spl suspension components. $$$ wallet can only take so much at a time.

Also will be adding the quaife LSD next year prior to the spring upgrade.

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Old 08-19-2014, 07:11 PM   #2 (permalink)
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I give full credit to others on this one, but the quick fix for you would be to drop to 18" wheels and run the 285/18 square setup with RS3's. I did it per one of my instructors (martin), and I am pretty sure he did it per some advice from (clintfocus) whom is a really fast dude lol .

We like the RS3 out here because it handles the heat of our tracks. Nothing wrong with the RE-11 and people in colder climates seem to prefer it. Never used it personally, but on tires I sort of follow the herd and my herd picks RS3's in SoCal.

On the OEM suspension, I personally feel(don't know) that the Hotchkiss would be too much. I would suggest either the Stillen or the Eibach sways as a huge, but not overkill solution that are both fairly inexpensive, and will make a large difference. I am now running the stillen sways on OEM suspension(non nismo) and it is wonderful as far as I am concerned. I can tell that once I upgrade springs and dampers that it will be too soft, but it is still an enormous upgrade from oem for ~ 300 bucks.
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Old 08-19-2014, 07:48 PM   #3 (permalink)
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Originally Posted by GSS138 View Post
I give full credit to others on this one, but the quick fix for you would be to drop to 18" wheels and run the 285/18 square setup with RS3's. I did it per one of my instructors (martin), and I am pretty sure he did it per some advice from (clintfocus) whom is a really fast dude lol .

We like the RS3 out here because it handles the heat of our tracks. Nothing wrong with the RE-11 and people in colder climates seem to prefer it. Never used it personally, but on tires I sort of follow the herd and my herd picks RS3's in SoCal.

On the OEM suspension, I personally feel(don't know) that the Hotchkiss would be too much. I would suggest either the Stillen or the Eibach sways as a huge, but not overkill solution that are both fairly inexpensive, and will make a large difference. I am now running the stillen sways on OEM suspension(non nismo) and it is wonderful as far as I am concerned. I can tell that once I upgrade springs and dampers that it will be too soft, but it is still an enormous upgrade from oem for ~ 300 bucks.

Sticking with our super laps. At least for now, not going to drop down to 18s so closest to "square" setup will be to run the 275/35/19s up front.

Currently on PSS and happy with them so far. If wife wants stickier tires I will def look at the rs3s

Are you suggesting keeping the stock rear bar and upgrading the front to the stillen or eibach set full stiff I'm assuming?
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Old 08-19-2014, 07:58 PM   #4 (permalink)
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Sticking with our super laps. At least for now, not going to drop down to 18s so closest to "square" setup will be to run the 275/35/19s up front.

Currently on PSS and happy with them so far. If wife wants stickier tires I will def look at the rs3s

Are you suggesting keeping the stock rear bar and upgrading the front to the stillen or eibach set full stiff I'm assuming?
Run the front of either brand at full stiff, with the eibach(don't know for sure maybe medium on the rear), on the stillen stay softest in in the rear.

The point is that both at full stiff are very close to about as stiff as you can go on OEM setup. Any stiffer(Whiteline or Hotchkiss or Doran's professional bar) is probably too much for oem dampers and springs. It's all about balance and is all relative.

It's like asking if an Olympic boxer is too tough to fight your little brother(OEM) or if an Olympic boxer is tough enough to fight Pacquiao(racing suspension).
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Old 08-19-2014, 08:29 PM   #5 (permalink)
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Run the front of either brand at full stiff, with the eibach(don't know for sure maybe medium on the rear), on the stillen stay softest in in the rear.

The point is that both at full stiff are very close to about as stiff as you can go on OEM setup. Any stiffer(Whiteline or Hotchkiss or Doran's professional bar) is probably too much for oem dampers and springs. It's all about balance and is all relative.

It's like asking if an Olympic boxer is too tough to fight your little brother(OEM) or if an Olympic boxer is tough enough to fight Pacquiao(racing suspension).
That makes sense. what about with swift spec R springs which I'll be going to down the road. Would the stillen bar be enough or would I need to upgrade to whitrline or Hotchkis at that point?
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Old 08-19-2014, 08:34 PM   #6 (permalink)
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That makes sense. what about with swift spec R springs which I'll be going to down the road. Would the stillen bar be enough or would I need to upgrade to whitrline or Hotchkis at that point?
Spec r's are a mild but very good upgrade as well. You are still within the OEM spec, but probably will want to upgrade your dampers to Koni yellows. Again another huge but very affordable upgrade in the street/track range. If you are going to look at swifts+konis, then you should definitely consider the KW one way setup as well. Both are very good in that price range. It sort of comes down to preference at that point. KW has some advantages in that the fronts are ride height adjustable coils which help with corner balancing, but me personally I hate the damn colors of their stupid springs so would buy the Swifts and Konis lol.
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Old 08-19-2014, 08:40 PM   #7 (permalink)
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Originally Posted by GSS138 View Post
Spec r's are a mild but very good upgrade as well. You are still within the OEM spec, but probably will want to upgrade your dampers to Koni yellows. Again another huge but very affordable upgrade in the street/track range. If you are going to look at swifts+konis, then you should definitely consider the KW one way setup as well. Both are very good in that price range. It sort of comes down to preference at that point. KW has some advantages in that the fronts are ride height adjustable coils which help with corner balancing, but me personally I hate the damn colors of their stupid springs so would buy the Swifts and Konis lol.
Lol at hating the colors

I'll most likely go with the swift/Koni yellow combo as it's a set it and forget setup.

Goal with this car is to keep things simple even tho I get that we're leaving handling on the table so to speak it will still be a big improvement over stock
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