Hi Guys,

I posted a while back about this and had some work done (had the car lowered on Swift Springs and put 20MM adapters in the front.

However , I am experiencing some pretty unpleasant vibrations at around 100km and over.


What is the solution here because I really love the flush look on the fronts but feel like these vibrations take away from my feeling of safety and performance of the car. Not to mention to vibrations intensify as I go past 100km/h.

Any thoughts or help would be much appreciated.

Thank you,

 

What brand spacers did you use? I read that the cheap brands cause vibrations; furthermore make sure they were not over-torqued when they were installed.

 

im not sure about the brand, but they are 20mm hub-centric adapters and what do you mean by over-torqued? i didnt know that was possible?

Thanks again,

 

You might need to do the wire behind the spacer mod which might fix it. Or get H&R spacers they don't vibrate at all

 

^^^ exactly.

Its the spacers. If you don't know what brand they are, I can almost guarentee they're a knock off. Where did you get them?

H&R are the highest rated spacers on the market. Let me know if you'd like some pricing, I can get you good quotes on new, otherwise there's always used in the private classifieds.

 

OP, Out of curiosity (since you have swift springs), do you have an 'x' sedan or RWD?

And PS, I agree with the above. Your spacers are probably not truly hubcentric, or they are warped. At any rate, I'm not a fan of spacers at all, but that's just my bent towards performance first.

 

It is a g37x ash.

Ya I prefer the performance myself. My shop friend says that he can tweak them to cut the vibration by re-torquing but I am not sure if that will work.

 

Thanks buddy. Your drop looks perfect. Stock shocks? How does it ride if so?

Try the re-torquing since hey, it's cheap. But I doubt it will work.

 

Hi Ash,

the only modifications are the Swift Springs drop (1.3in F / 1.0 R) and the 20mm adapters.

It has great handling and a very aggresive stance, but the ride comfort is absolutely terrible. I have to watch the road for ****ty potholes the whole time because the Toronto area is full of those.

All in all happy with the look, wish I had some comfort left.

 

Sorry to hear that, too bad. That's what I fear with springs for my ride too, although with the sport shocks it might not be as severe as what you are experiencing. It's shocking (ha) that there aren't any shock replacements designed for the sedans. There are coupe shocks out there like Tokico HP's and Koni Yellow that will fit the sedan, but are not ideally suited for it. Can't be worse than stock though... unless the 'x' has a completely different shock design (I don't know).

That's why I feel forced to get coilovers.

 

Thanks for clarifying the decrease of ride comfort since a lot of people claim that the ride is not affected at all with a drop and wheel upgrade which I find hard to believe.

I guess I will stick to my stock suspension.

 

First "ashmostro" there is nothing wrong with spacers if they are of quality construction and are truly designed for the car. H&R and Eibach make quality spacers and I have raced (track school) on 25mm H&R spacers for the rear and 15mm for the front using sticky track tires on my NSX for over 15 years with no problems or vibrations. Second it's really fairly easy to find out where the vibration on this car comes from by just doing simple logic while trouble shooting the problem. Ask your self these questions in this order:

1. Did the car ride fine and without vibrations of any type while stock?
2. If yes, then what changes have you made to the car?
3. It sounds like you added new springs, and spacers. See #6 next before proceeding.
4. Remove the spacers. Does it still vibrate. Yes, your springs are probably overwhelming the shocks valving capabilities. Get better shocks or different springs.
5. If no, then it's probably your spacers. Take the spacers off and see what happens with the stock mounting point. Make sure your lug nuts are torqued to 81 lbs. and do this by hand with the proper tool. If you don't have a torque wrench get one. A half way decent one should cost no more than $30 or so. Sears has a ton of them.

If the problem goes away with the spacers off, then find a better quality spacer. Don't go with any spacer large than 15mm or greater on this car. You may not be engaging enough threads on your lug nuts to hold the wheel on properly with a large spacer and this causes the wheel to feel tight when torqued on the ground but once moving, the road vibration causes enough flex to the lug nut bolts to loosen dynamically. The wheel then is actually moving or vibrating while on the spacer/hub setup and you are now in a dangerous territory. There are spacers that can solve that problem which are 15mm or larger but they cost more and are have their own lugs on the spacer to bolt the wheel on.

Also remember that the spacers are changing the stress on the suspension components due to the extra length they create on the outside of the rims normal mounting point. This extra length will accentuate the action on the suspension components of any road irregularities such as a pothole. This may be just enough to overwork a shocks valving for what the car may have been designed to handle and give you the feeling of a less secure road feel.

6. Check to see that you haven't thrown a wheel weight or that one wasn't accidentally knocked off when the car was worked on. It wouldn't be the first time I've seen that happen.

I've had a similar problem like this when I bought different rims for my NSX which I just couldn't figure out. It ended up being the custom spacers they made for the rim which were not hub centric and moved while I was driving even though I had torqued the rims to specs. Eventually I lost 3 lugs on the right rear and two on the left rear while traveling on the twisty Highway 1 on the California coast. Had I lost a wheel while driving we would have gone over a cliff into the ocean below. Damn lucky.

Your problem is probably minor but find out what it is so you can then trust the car again.

Al

 

Excellent post, Bandit. Very helpful.

But I remain stalwart in my preference against spacers, particularly on the front axle. Reason being, any change to the centerline of the front wheelset will affect the steering balance in some way (in some cases positively if the stock setup isn't tuned right).

I love the steering feel of the G- it's nearly perfect- and I don't want to change that which is why I don't like spacers.

That's my choice though, I'm not imposing that view on others since there are different motivations at work with any modification decision.

 

Hi gdup20 your g37x Looks awesome with the 370z wheels, I'm getting the same ones for my 2011 and have a question, how is the the rims with the AWD system?isvthe car driving fine with the wheels?

 

Welcome to the site~just a heads-up, when you open an old thread be sure to check the last activity of the member you're requesting info from. Just click on the user name and click user profile, when that screen pops up it will show their last activity date.
The member you're wanting info from hasn't been on the site in almost 3 years.