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Sub Frame Movement

Bl4cK32
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Bl4cK32 Grand Master

Bl4cK32

Posted
Posted

Howdy,

Just had the car tuned recently, and its making more power obviously.

With my 2 way diff, you can feel the rear end move around now.

I need advice on how to stiffen the rear....

Do I replace the bushes with std ones, or go the Noltec urethane ones?

How much NVH does the urethane ones add to the car? Car is mainly a road car with some track work intended in the future.

Which "pineapples" do people suggest - the alloy ones, or the other urethane ones?

Im thinking of going for the Noltec, with the alloy mounts but dont want the ride to become a rattle box.....

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MerlinTheHapyPig Mentor

MerlinTheHapyPig

Posted
Posted

get alloy subframe spacers/pineapples. They apparently make a huge difference, no more axle tramp!!

There is a thread on them on http://www.nissansilvia.com/forums/index.p...showtopic=84489 a couple of people mentioned u don't get much more drivetrain noise

IMO i woudn't bother with the urethane ones, i'd just go straight to the alloy ones. I have some ready to go into my car, just c.b.f'd installing them.

What sort of track work? drift??

(If you want to buy a set, PM me)

Bl4cK32 Grand Master

Bl4cK32

Posted
  • Author
Posted

I dont have axle tramp at all suprisingly. I wanna replace the mounts first, then move onto

these alloy pineapples....

Car is mostly street driven, with the odd track in the future. No drift, just circuit :( Maybe drags if i feel like having a number....(pmk me what you can get them for :))

cheers.

NZM.031 Grand Master

NZM.031

Posted
Posted

go the alloy pinapples. urethane ones require new bushes to be fitted for best handling. alloy ones squash everything up and make it so it cant move.

i have the alloy ones, they made a huge difference, i set them up for drift and could instantly feel the difference when sliding....the back end hangs out alot longer and easier.

cheers

Linton

MerlinTheHapyPig Mentor

MerlinTheHapyPig

Posted
Posted

ohh, i'm gonna get off my arse and put mine in..... my rear end is crap coz of soft coilovers. I just put a rear strut brace in and it makes a big difference for drift, this should make it even better.

in fact, if you don't have one, i'd also suggest a rear strut tower brace

http://www.skylinesaustralia.com/forums/sh...ead.php?t=77338

gts4diehard Rising Star

gts4diehard

Posted
Posted

hi, ive got the noltec subframe bushes( not pineapples) in my car and I dont notice any increase in road noise/ harshness at all.

I also have new rear rack and hub bushes(nissan rubber) - done after subframe bushes fitted - so everything is pretty much new and tight and still dont feel any harshness at all. The car really holds the line well in the rear now, more noticeable improvement after doing rear rack and hub bushes than that felt when the subframe bushes were fitted first. Feels more positive on the track also, showing up the failings of my tyres as they do the squirming under load rather than the old subframe bushes that wiggled the car around corners!

A mate has noltec subframe bushes in his 32 GTR and I havent noticed any change in noise/ harshness.

Trust33 Grand Master

Trust33

Posted
Posted
hi, ive got the noltec subframe bushes( not pineapples) in my car and I dont notice any increase in road noise/ harshness at all.  

I also have new rear rack and hub bushes(nissan rubber) - done after subframe bushes fitted - so everything is pretty much new and tight and still dont feel any harshness at all. The car really holds the line well in the rear now, more noticeable improvement after doing rear rack and hub bushes than that felt when the subframe bushes were fitted first.  Feels more positive on the track also, showing up the failings of my tyres as they do the squirming under load rather than the old subframe bushes that wiggled the car around corners!

A mate has noltec subframe bushes in his 32 GTR and I havent noticed any change in noise/ harshness.

What is the difference between subframe bushes and pineapples.I was under the impression that they were one and the same,just given different names by different people.

predator Grand Master

predator

Posted
Posted

as gts4diehard is saying.. rear rack ends are probably a good idea to replace too if you're doing the subframe bushes, as they will firm up the rear, and stop some movement there as well.

as pointed out by the suspension place I got the work done, even if you lock the HICAS.. you still have something decent on the ends to hold it in place :)

Made a bit of a difference in mine at higher speeds with a firmer feel

Sydneykid Grand Master

Sydneykid

Posted
Posted

Replacement bushes (alloy or polyurethane) are NOT the same as "pineapples".

Replacement bushes simply replace the standard rubber bushes with a firmer (hardness) material. In the case of aluminium that is solid, which is not a good idea as it can lead to cracking of the subframe mounts. Nissan designed the rubber bushes to prevent this and to lower the NVH. Polyurethane is a good mid ground, it is much firmer than rubber (45 versus 90 duro) but it has some give to keep the NVH within reason and to prevent the chassis cracking under the vibration.

Pinapples are "tuning" device, by placing them above and/or below the subframe you can tune the amount of antisquat. More squat for drags gives better traction and faster launch. Lots of antisquat for drift to decrease the traction and enables easy/earlier slide.

Pineapples do add a worthhwhile amount of extra rigidity when used with the standard rubbers. But they make no difference to rigidity when used with aluminium bushes and very little difference when used with polyurethane bushes.

Hope that helps ;)

Sydneykid Grand Master

Sydneykid

Posted
Posted
Nissan don't supply replacement subframe bushes.

They said they are not servicable.

its the same for even their Aus released cars. 300zx etc, no supply. :)

I think Nismo make "hardness up" rubber bushes:cheers:

Trust33 Grand Master

Trust33

Posted
Posted

Pineapples still sound like a goer with a whiteline kit.Ie:the extra urethane bushes that come with the kit.

But then would it or would it not show up the weak links in the cars handling.Like the tyres.

Is the 1degree +/- camber for the front,supplied in the whiteline kit as an extra,enough for most spirited weekend drivers.Or would stock camber up front suffice.

Sydneykid Grand Master

Sydneykid

Posted
Posted
Pineapples still sound like a goer with a whiteline kit.Ie:the extra urethane bushes that come with the kit.

1. But then would it or would it not show up the weak links in the cars handling.Like the tyres.

2. Is the 1degree +/- camber for the front,supplied in the whiteline kit as an extra,enough for most spirited weekend drivers.

3. Or would stock camber up front suffice.

Hi Trust33;

1. The weakest link is always the weakest link, but there is no doubt that more contact patch from less roll will help any tyre.

2. When you lower them they end up at 1 to 1.5 degrees negative anyway, then add the Whiteline adjusters and you usually get 2.5 degrees negative. Which is not a bad place to start

3. Nope

:D

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