Alignment Specs For 350Z Springs On A Sedan?

[Murry33]

Awesome cheers man! that sits really nicely

Did you notice much of a difference in driving it now?

Edited February 9, 2013 by Murry33

[sonicii]

not too much, it does seem to sit a bit flatter when taking corners at normal speed, but I don't feel like I can push it through corners faster than before.

I was a bit worried about the comfort level as I have the revised rear 350Z springs which have a higher spring rate than the standard V. but I can't really notice it..

I am fairly happy with how it looks.. I didn't really like the look of the front with the stock springs, especially with the smaller front tyres..

[Murry33]

Yeah i decided against coilovers, would feel very stiff for a car like this i imagine.

[Deep Dish V35]

camber visual, 350z non touring shocks and springs on 35 sedan with standard arms

rear

front

[sonicii]

If I had a square that size, I could do some comparisons. Although my rears are aligned to spec, and the fronts don't seem to be that bad on mine..

Do you know how much camber that is on yours?

[Murry33]

i'll got 19x10s up front, 19x11 at the rear......i hope the camber ends up being alright lol

doesn't look too bad at all in those above pics.

Edited February 11, 2013 by Murry33

[Deep Dish V35]

rear is -3.5* naturally. front is about -1.5*

front look almost uncambered in comparison, if i bought camber arms for the front to make it -3.5* all round, i'd need to space my front wheels out 15mm to correct the guard flushness

if i went another inch lower, the rears will be -4.5* due to IRS, front will stay about the same

Edited February 11, 2013 by Deep Dish V35

[sonicii]

Thanks.

Still trying to work out the differences between the 350z suspension and the V35 sedan suspension.. if it is just the springs and shocks, it doesn't explain why the camber on a stock 350z is fine, but fitting the 350z springs in a V35 causes camber issues?? especially since there is no camber adjustment on the front.. Everything I read says everything else is the same.. just trying to get my head around it..

[Deep Dish V35]

the 350z springs and shocks are shorter than v35 units, you are lowering the v35 by fitting the 350z items. when you lower the V35 the rear camber increases much more than the front just by design

Edited February 11, 2013 by Deep Dish V35

[sonicii]

sure, but the rear has camber adjustment from factory, they aligner was able to get mine in spec with 350z springs, but the front only has toe.. so why does the 350z front have -0.3deg camber and a v35 with 350z springs have closer to -1.5deg? something has to be different? or am I missing something really obvious?

[Deep Dish V35]

must just be the angle of the upper and lower arms, lowered v35 vs standard height 350z

[sonicii]

Yeah, but if everything else is the same, why would those angles be different between a stock 350z and a V35 with 350z springs?

If you put V35 sedan springs in a 350z, do you end up with a + camber? And if so, why? What else is different?

[Deep Dish V35]

the main difference is the height of the top tower mount. the 350z body has a lower profile, so they made the tower mount lower, which required shorter suspension.

this is difficult to explain....

on the front wheels, the camber changes because the hub follows geometry based around its "king pin inclination", which is the position of the upper and lower pivot points of the hub. the top pivot point is always positioned further into the car. as a result, the upper arm is usually shorter. the difference in length between the upper and lower arm means that both have a different rotational radius which creates a slight amount of camber as the arms compress upwards. The other factor is the upper and lower arm angle. these arms are never designed to be parallel, so each arm is in a different stage of its rotational length....

if the arms were equal length and parallel, the wheel would always have the same camber. this is no good for cornering.

the difference between the front and rear suspension is that the front has 2 vertical pivot points, where as the rear has only one. with one pivot point, the rear's camber increases dramatically. with 2 pivot points on the front, the suspension stays more square

the arms are designed to be a certain angle at standard height, the correct angle of the arm on both cars has a different distance to the top tower mount, hence the longer strut/spring in the v35

its kinda hard to describe without drawing pictures

Edited February 12, 2013 by Deep Dish V35

[sonicii]

I understand that.. but if you fit 350z springs and shocks in a V35, and there are no other suspension differences.. therefore a stock 350z, and V35 with 350z springs should have all suspension arms at the same angle.. so why is the camber different between the 2 vehicles when there is no camber adjustment? there must be some other differences with the suspenion.. the weight difference between the 2 is quite small, so I doubt that is causing it.

Edited February 12, 2013 by sonicii

[Deep Dish V35]

edited previous post

[Deep Dish V35]

the other thing is: even though the suspension parts are the same, the bodies are not. the obvious difference is the height of the strut tower, but then the body mounting points for the suspension arms could be slightly different too...

[sonicii]

Thanks for the info.. it was quite good.

I think I understand.. correct me if I am wrong..

because the 350z has a different strut mount height in relation the suspension, the 350Z suspension arms with stock 350z springs sit at approximatly the same angle as the suspension arms in a V35 with stock V35 springs?

so a V35 with 350Z springs has the arms at different angles when compared to a stock 350z?

Meaning the subframe is actually closer to the road on a V35 with 350z springs than it is on a stock 350z?

Edited February 12, 2013 by sonicii

[Deep Dish V35]

i can only say : in theory that is correct. i have not physically measured a 350z...

the only other difference i can think of is the body mounting points. every part is designed to work at certain angles on a particular car, and a 350z is not a v35. each model may have body mount differences to encourage different suspension geometry... they can dial in different rates by changing mounting points. even moving the tower top closer to the centre of the car changes things such as spring rates...

you cant just throw together good suspension, it involves hundreds of calculations and variables. and changing just one point can affect many other things. even widening your wheel track affects the suspension rate marginally

considering that all mechanical parts except shocks and springs are identical, you would have to measure the difference between the wheel mounting faces, the tower tops, the arm's body mounting points (width and height) to see if there are any that dont match.

its seriously complex.

[sonicii]

awesome.. thanks for the info.. and enduring with a suspension noob!!

[Murry33]

When i put my new 350z springs + shocks in soon, my main concern is the side skirts on the Coupe sits very low as it is with standard suspension.

With these lower springs i hope i don't wedge my car on a speed hump is all lol