NC oversteering / slipping problem

[NitroDann]

Stock NC springrate is 110lb front 90lb rear I believe.

Thats a 22% stiffer front.

If he has 12/9 thats actually more understeer biased, and 9/4 is extremely understeer biased in comparison.

Dann

[JBT]

A Club friend who, like me, enjoys a "spirited" drive has MCAs fitted to his NC with stock sway bars. His car handles perfectly. MCA set-ups do not work with aftermarket sways.

I agree that tyre pressure could be an issue. I'd also get a second opinion on the wheel alignment. I find 30-32 psi cold work just right for street.

My NC has Tein Flex Z and Whiteline adjustable sways. The sways were on before the Teins. Fulcrum (Tein AU agents) recommended sticking with the aftermarket sways but the Tein springs are much softer than MCA. Mine is like a go cart.

I have recently had MCA street essentials fitted to my BMW E82 and the difference from stock is astounding. The car handles almost as well as the MX-5 now instead of plow, dive, undertseer.

I doubt the problem is MCA. Maybe a track day would help you sort the problem.

[RS2000]

Rear toe might be way off. Was the alignment done by someone who knows what they're doing?

[mitch027]

get an alignment done with a print out

[Regie]

I see you are running Kumho KU31's

they have been out of production for approx 4 years.

Get yourself some new tyres. awesome tyres around in the 215/225 profile which is what you'll want

[bliu6757]

I see you are running Kumho KU31's

they have been out of production for approx 4 years.

Get yourself some new tyres. awesome tyres around in the 215/225 profile which is what you'll want

Got myself some pilot sport 4 21545r17. Next is alignment. Any good and affordable places in the northwest suburbs?


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[Regie]

northwest suburbs of where?

if Syd could always hit up mania, im sure they do alignments there.

so still oversteers with the new tyres?

[JBT]

Just settle for good or excellent and knowledgeable. Which city?

[Custardtart]

The best way to approach this is to eliminate known issues first.
So, change the tyres. 4 yr old worn tyres can be utterly useless. You didn’t need semi slicks but half decent rubber like Bridgestone RE003’s or Hankook rS4’s will provide all the grip you would want on the road.

Next up, get an alignment done from an MX5 specialist.
Ask them to check your sway bars are all ok, not loose etc.

Assuming that’s all ok, don’t touch the sway bars. The OEM set up is fine for all but serious track use. Stiffer front bars can provide the driver with a flatter, more precise turn in on a road car but in reality will result in more understeer.

If your still struggling, ask MCA to dyno the shocks, it’s rare but sometimes seriously mismatched shocks can lead to pretty bad handling issues.

Failing that, it’s probably your driving approach or the car has a bent chassis.

[bliu6757]

northwest suburbs of where?

if Syd could always hit up mania, im sure they do alignments there.

so still oversteers with the new tyres?

Ye probs have them have a look.

Getting the tyres fitted this Saturday. Will let you know.


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[bliu6757]

The best way to approach this is to eliminate known issues first.
So, change the tyres. 4 yr old worn tyres can be utterly useless. You didn’t need semi slicks but half decent rubber like Bridgestone RE003’s or Hankook rS4’s will provide all the grip you would want on the road.

Next up, get an alignment done from an MX5 specialist.
Ask them to check your sway bars are all ok, not loose etc.

Assuming that’s all ok, don’t touch the sway bars. The OEM set up is fine for all but serious track use. Stiffer front bars can provide the driver with a flatter, more precise turn in on a road car but in reality will result in more understeer.

If your still struggling, ask MCA to dyno the shocks, it’s rare but sometimes seriously mismatched shocks can lead to pretty bad handling issues.

Failing that, it’s probably your driving approach or the car has a bent chassis.

Thanks for the detailed response. I’m getting the tyres fitted this weekend so will have a look. I plan to have an alignment done ASAP after fitting the tyres. The ps4 came cheaper than the other two so I opted for them.

Hmm.. I’m not sure whether this changes anything.. however, when I first got my mca blues, the right rear coils kept knocking. Called mca and was told it was ok to drive. But when my mate lifted it up with a hoist, it literally broke apart by itself I.e all the liquid the coils just fell apart. Josh was kind enough to send me a replacement straight away. However with all the trouble I went through, I did plan to do a review, just never had time. Since, there has been so many good reviews, I didn’t want to blame the oversteer on mca. However, now you have mentioned it.. I am wondering if that would be the case.

I’m thinking I really need a good mx5 specialist to give it a look. Is there any reputable ones in Sydney?

I know mca recommended me to try vsport. What’s everyone else’s experience?




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[JBT]

Something is seriously wrong there for the shock/damper to come apart. I can't say I've ever seen anything like that before.
Very bad look for MCA and they should thoroughly check this whole set-up on-site through an agent.
Were both rear shocks replaced?
Are both rear shocks set to the same stiffness?

[Regie]

wow

then again thats not the first time ive herd/seen MCA quality control issues.

Forget about posting anything more until you have your new tyres installed. that will fix everything

MX5 mania as I mentioned above is a MX5 specialist located in Dural

[bliu6757]

:shock: Something is seriously wrong there for the shock/damper to come apart. I can't say I've ever seen anything like that before.
Very bad look for MCA and they should thoroughly check this whole set-up on-site through an agent.
Were both rear shocks replaced?
Are both rear shocks set to the same stiffness?

I know. I never chased them about it after fitting the replacement. Maybe I should have.

Only the rear right one was replaced. The stiffness is set at the same setting.


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[Custardtart]

I’m in brisbane so don’t know any of the specialists in Sydney but a quick google showed MX5 Mania in Dural.