DNA racing front suspension arms.

[Sylvi]

I’ve looked at it and it’s basically a copy of the Whiteline one. What they don’t state (nor do Whiteline for that matter) is how stiff the bushes are.

AIRTEC Motorsport Torque Mount for Hyundai i20N

Upgrading the original torque mount reduces engine movement and wheel hop during hard acceleration, which allows for faster gear changes and a feeling of improved response. Finished in anodised black, the heavy-duty mount is machined from billet aluminium and is offered with purple bush inserts...

www.airtecmotorsport.com

Just ask there if they can be exchanged for harder ones.

 

[YNWaN]

AIRTEC Motorsport Torque Mount for Hyundai i20N

Upgrading the original torque mount reduces engine movement and wheel hop during hard acceleration, which allows for faster gear changes and a feeling of improved response. Finished in anodised black, the heavy-duty mount is machined from billet aluminium and is offered with purple bush inserts...

www.airtecmotorsport.com

Just ask there if they can be exchanged for harder ones.

Good idea, I’ve just emailed them.

 

[YNWaN]

Well I’ve already received a very helpful response from Airtec and they say that if I make a note of my request during ordering they will fit black bushes instead of purple - so I’m doing that! Fantastic service .

 

[YNWaN]

Well I’ve already received a very helpful response from Airtec and they say that if I make a note of my request during ordering they will fit black bushes instead of purple - so I’m doing that! Fantastic service .

Unfortunately I have now been told that there has been a mistake and the bushes on the Hyundai mounts cannot be changed out for black - so I’m cancelling this order. I’m not prepared to pay hundreds of pounds for something that may not be as good as what I already have.

 

[JoKiV]

We’re writing about the harshness of the bushings but I wonder if the design, material and for example weight of the dogbone aren’t equal or even more important. I mean that the Powerflex looks quite like the oem one, the Whiteline looks quite different in design and how everything is bolted together, and the Airtec looks a bit like it the bolts are weaker. Just considering.

 

[YNWaN]

The weight is inconsequential given the two masses it connects (the engine and the chassis), plus the Whiteline, Airtec and others are all billet aluminium whilst the stock one is pressure cast aluminium, so the weight of all of them will be quite close. But I completely agree that the design will make a significant difference. The key difference with the Powerflex compared to the stock one is that it uses two bolts instead of one, that holds the parts together. This will significantly increase resistance to twist/torque compared to the stock design, but still not as muc( as the shouldered designs of Airtec and Whiteline.

I’ve now heard back from Airtec and they tell me that their bushes are shore A90, so only 5 below Powerflex Black.

 

[YNWaN]

Anyway, apparently Airtec have already shipped my unit so too late to cancel - plus they tell me that even if I fit it they will still refund me if I don’t like it! As it may well arrive tomorrow I’ll weigh it and measure the bolts .

 

[YNWaN]

We’re writing about the harshness of the bushings but I wonder if the design, material and for example weight of the dogbone aren’t equal or even more important. I mean that the Powerflex looks quite like the oem one, the Whiteline looks quite different in design and how everything is bolted together, and the Airtec looks a bit like it the bolts are weaker. Just considering.

I’ve already received the Airtec and have measured the bolts and weighed it. I can confirm that both the mounting bracket and main part are machined from billet aluminium. The main bolt holding the two parts is M12 and this is the same diameter as the OEM bolt that holds the assembly to the car. The whole lot weighs 1484g.
The Airtec is actually very nicely made with some interesting/odd design quirks that I don’t really understand - for some reason it’s been made slightly asymmetricaly.
In the picture you can see the bracket, labelled 2. Has one wall that is twice as thick as the other and this causes part 1. To be slightly offset from the centre line. The only reason I can see for doing this is to provide more thread for the bolt marked as B. Whilst, on the face of it, this is a good idea there is no lock nut and given the level of vibration and back and forth movement, it’s not inconceivable that bolt B could work itself loose. To compensate for the offset caused by the bracket there is a spacer for the bolt marked A. Its also worth noting that, as supplied parts 1 and 2 were bolted together but in the wrong configuration meaning it would not have aligned in the car. This problem would not be possible if its construction was symmetrical and if a nut and bolt (as Whiteline use) had been used instead of threading the bracket B2! A lock nut would also give a more secure connection! As a result I’m going to replace bolt B with a longer one and use a nylock nut and a washer.
The final quirk of this design is that bracket part 2 has a ledge machined on the mounting surface (you can’t see this in the picture). This means that the bracket can only be fitted one way round. But this adds quite a bit of machining and wouldn’t be needed if the bracket were symmetrical!

 

[JoKiV]

I’ve already received the Airtec and have measured the bolts and weighed it. I can confirm that both the mounting bracket and main part are machined from billet aluminium. The main bolt holding the two parts is M12 and this is the same diameter as the OEM bolt that holds the assembly to the car. The whole lot weighs 1484g.
The Airtec is actually very nicely made with some interesting/odd design quirks that I don’t really understand. For some reason it’s been made slightly asymmetricaly.
In the picture you se the bracket, labelled 2. Has one wall that is twice as thick as the other and this causes part 1. To be slightly offset from the centre line. The only reason I can see for doing this is to provide more thread for the bolt marked as B. Whilst, on the face of it, this is a good idea there is no lock nut and given the level of vibration and back and forth movement, it’s not inconceivable that bolt B could work itself loose. To compensate for the offset caused by the bracket there is a spacer for the bolt marked A. Its also worth noting that, as supplied parts 1 and 2 were bolted together but in the wrong configuration meaning it would not have aligned in the car. This problem would not be possible if its construction was symmetrical and if a nut and bolt (as Whiteline use) had been used instead of threading the bracket B2! A lock nut would also give a more secure connection! As a result I’m going to replace bolt B with a longer one and use a nylock nut and a washer.
The final quirk of this design is that bracket part 2 has a ledge machined on the mounting surface (you can’t see this in the picture). This means that the bracket can only be fitted one way round. But this adds quite a bit of machining and wouldn’t be needed if the bracket were symmetrical!

View attachment 27449

Any more vibrations? How does it feel when driving?

 

[YNWaN]

Any more vibrations? How does it feel when driving?

Oh I’ve not had a chance to fit it - in fact the way the British weather is I may not be able to fit it for a month (perhaps two). Although there are some minor detail differences between the Whiteline and the Airtec, and assuming the Shore values I’ve been told are correct, I think the Whiteline and Airtec will perform almost identicaly.

 

[PogueMahone]

Unfortunately Whiteline have a U.K. distributor so won’t sell directly from Australia. Anything shipped from the U.S.A. Is cripplingly expensive in the U.K. once import tariffs are paid and U.S.A. companies always seem to charge exorbitant shipping!

Would it work out cheaper to order it from Australia, get it delivered to an Australian address and then I can send it over to you?

 

[YNWaN]

Would it work out cheaper to order it from Australia, get it delivered to an Australian address and then I can send it over to you?

Well that’s super generous of you and yes, it would work out cheaper to get it sent from Australia. Having a U.K. distributor greatly increases the price (because of their added margin). However, I have the Airtec now - but if that doesn’t do the job I’ll likely be asking if I can take you up on the offer .

 

[PogueMahone]

Well that’s super generous of you and yes, it would work out cheaper to get it sent from Australia. Having a U.K. distributor greatly increases the price (because of their added margin). However, I have the Airtec now - but if that doesn’t do the job I’ll likely be asking if I can take you up on the offer .

No expiry on the offer. No point in having a global forum if we don't take advantage of it as a community and help each other.

 

[YNWaN]

No expiry on the offer. No point in having a global forum if we don't take advantage of it as a community and help each other.

Top man, and thanks again

 

[YNWaN]

What I have found is that it’s possible to cast your own poly bushes and that would be an option as the Airtec mount uses four identical bushes that are a simple ‘top hat’ design. The other option is to have the bushes machined from Delrin. This is a hard, semi waxy, plastic and would make the whole mount extremely rigid. The only increase in rigidity that could be done after that would be metal bushes (aluminium or brass).

Yesterday I did the latest infotainment update and whilst it was downloading I sat in the car with the engine at idle and in neutral. This was, I think, the first time since I changed all the engine and gearbox mounts to Powerflex Black that I’ve sat In the car for such a long time with it cold and at idle. The amount of vibration at startup is quite comic - once the cold start period passes there is, if anything, even worse vibration for about ten minutes and then it magically disappears! One clear indication is that all the parts of the car that were making vibration noises stop doing so . Presumably this means the engine has warmed up.