Jump to content
SAU Community

Couple Of Handling Questions

33driver
 Share

Recommended Posts

33driver Rising Star

33driver

Posted
Posted

Hey guys,

Love the car, absolute blast to drive, however now that i've been driving it for a bit, i'm starting to look into its hopefully minor issues.

Issue 1) After full wheel alignment and balance, car still has slight vibration at high speeds - i'm calling shit tyres since the guy at the workshop said the rear's where out of whack and slightly egged just want confirmation.

Issue 2) Car pulls to the left if I let the steering wheel go - car has coilovers but are old and way to hard and i think oversprung, possibilites? castor rods? control arm or something i can adjust?

issue 3) how to tell if car is over sprung - i think it is, had 2 people get in on the passenger side, was sagged and i could 'feel' the damper move and actually work rather than the spring just bounce around like usual - my thinking is with more weight its stopped the spring from moving as much and allowing the damper to do its job. With just me in the car, if i go over a large bump you can hear the springs 'resonate' and clang around.

Issue 1 and 3 i think can be fixed with new tires and a change in suspension, issue 2 i'm not sure about. No obvious viscous fluids so i'm not sure about the castor rods, but my mechanic is away so i can't talk it through with him.

Cheers guys! For once i'm actually looking forward to working on a car!

Link to comment
https://www.sau.com.au/forums/topic/138960-couple-of-handling-questions/
Share on other sites
salad Veteran

salad

Posted
Posted (edited)

1. is the vibration through the steering wheel or through the seat?

if its through the seat, more than likely its the rear tyres fault as the guy said

2. cars pull with uneven camber and/or castor. they pull to the side with less camber/castor.

to fix the problem get castor rods/bushes. if the camber is uneven too get camber bushes/arms.

all this information will be on you wheel alignment report. both camber and castor should be very close to even.

if there is castor adjustment, wheel aligners will set the left up with 0.5-1.0deg more castor to accomodate for the natural camber of roads (which allow for water drainage)

Edited by salad
33driver Rising Star

33driver

Posted
  • Author
Posted

well there's my answer for the pulling to the left, wheel alignment report shows left at +4.41 degrees and right at +5.57 degrees.

Are the castor rods seperate to the bushes or are they together? Just replace both?

Vibration is the last thing ot worry about i guess, it only happs at about 110km/h plus. Before the alignment it was about 80km/h plus

salad Veteran

salad

Posted
Posted

sounds like front tyres still out of balance... alignment wont affect vibration.

rods are seperate to bushes. replace the bushes in the stock rods or replace the whole rod with an aftermarket rosejointed item

bush's are the more street friendly option.

i think you can get enough adjustment out, but im not sure, someone else will have to clarify as i've never had bushes.

rose jointed rods have a lot of adjustment, more than enough, but they're not recommended for street.

Kinks Grand Master

Kinks

Posted
Posted (edited)

rose joints are illegal on the street, because when they wear out they fall apart.. Having your suspension detach in the middle is generally not a good thing :laugh:

You don't need that much adjustment on the street. On the track, sure.. especially with semis :)

If your alignment is fine but the bushes are clapped out just get the bushes replaced. Otherwise get adjustable castor rods and have at it (have seen the noltec ones for a 32 GTR and they make a brick shithouse look like a tent).

Vibration is either caused by out of balance, cheap out-of-round tyres or that your wheels aren't perfectly true on the hubs (you will probably get brake vibration if this is the case because the rotor will be out as well). Edit - if your wheel bearings are on the way out that can cause it too.

If the springs are bouncing around like you say it sounds like the car is oversprung. Personally I think it's foolish to run rock hard suspension on aussie roads, get some nicely matched springs and shocks instead!!

Edited by Kinks

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • GTSBoy
      R32 GTR EV? The leaf of the Godzilla's!

      By GTSBoy · Posted

      Yeah, all the crude is used for fuels and petrochem feedstocks (pesticides, many other chemicals, etc etc). But increasingly over the last few decades, much of the petrochem synthessis has started with methane because NG has been cheaper than oil, cleaner and easier and more consistent to work with, etc etc etc. So it's really had to say what the fraction either way is. Suffice to say - the direct fuels fraction is not insigificant. Heavy transport uses excruciatingly large amounts. Diesel is wasted in jet heaters in North American garages and workshops, thrown down drill holes in quarries, pissed all over the wall to provide electricity to certain outback communities, etc etc. Obviously road transport, and our pet project, recreational consumption camouflaged as road transport, is a smaller fraction of the total liquid HC consumption again. If you're talking aboust Aussie cars' contribution to the absolute total CO2 production of the country, then of course our share of the cubic mile of coal that is used for power generation, metallurgy, etc adds up to a big chunk. Then there is the consumption of timber. Did you know that the production of silicon metal, for example, is done in Australia by using hardwood? And f**king lots and lots and lots of hardwood at that. Until recently, it was f**king jarrah! There are many such sneaky contributors to CO2 production in industry and farming. NG is used in massive quantities in Australia, for power gen, for running huge water pumps (like, 1-2MW sized caterpillar V16 engines running flat out pumping water) for places like mine sites and minerals/metals refineries. And there are just a huge number of those sort of things going on quietly in the background. So NG use is a big fraction of total CO2 production here. I mean, shit, I personally design burners that are used in furnaces here in Oz that use multiple MW of gas all day every day. The largest such that I've done (not here in Oz) was rated to 150MW. One. Single. Gas burner. In a cement clinker kiln. There are thousands of such things out there in the world. There are double digits of them just here in Oz. (OK< just barely double digits now that a lot of them have shut - and they are all <100MW). But it's all the same to me. People in the car world (like this forum's users) would like to think that you only have to create an industrial capability to replace the fuel that they will be using in 10 years time, and imagine that everyone else will be driving EVs. And while the latter part of that is largely true, the liquid HC fuel industry as a whole is so much more massive than the bit used for cars, that there will be no commercial pressure to produce "renewable" "synthetic" fuels just for cars, when 100x that much would still be being burnt straight from the well. You have to replace it all, or you're not doing what is required. And then you get back to my massive numbers. People don't handle massive numbers at all well. Once you get past about 7 or 8 zeros, it becomes meaningless for most people.
    • MBS206
      R32 GTR EV? The leaf of the Godzilla's!

      By MBS206 · Posted

      @GTSBoy out of the cubic mile of crude oil we burn each year, I wonder how much of that is actually used for providing petrol and diesel.   From memory the figure for cars in Australia, is that they only add up to about 2 to 3% of our CO2 production. Which means something else here is burning a shit tonne of stuff to make CO2, and we're not really straight up burning oil everywhere, so our CO2 production is coming from elsewhere too.   Also we should totally just run thermal energy from deep in the ground. That way we can start to cool the inside of the planet and reverse global warming (PS, this last paragraph is a total piss take)
    • TurboTapin
      R32 GTR EV? The leaf of the Godzilla's!

      By TurboTapin · Posted

      As somebody who works in the energy sector and lives in a subzero climate, i'm convinced EV's will never be the bulk of our transport.  EV battery and vehicle companies over here have been going bankrupt on a weekly basis the last year. 
    • Dose Pipe Sutututu
      R32 GTR EV? The leaf of the Godzilla's!

      By Dose Pipe Sutututu · Posted

      With all the rust on those R32s, how can it even support all the extra weight requirements. Probably end up handling as well as a 1990s Ford Falcon Taxi.
    • GTSBoy
      R32 GTR EV? The leaf of the Godzilla's!

      By GTSBoy · Posted

      Yes...but look at the numbers. There is a tiny tiny fraction of the number of Joules available, compared to what is used/needed. Just because things are "possible" doesn't make them meaningful.
×
×
  • Create New...