GTSPEC FX35 Coil Over Kit *** Possible ***

I need some information .. any one can provide ?

These are the info I need for a baseline data on the stock spring.

1. Prior to removing the spring, I need the install height of the spring.

2. Prior to removing the spring, I also need the vehicle corner weight or front / rear weights.

3. After that, I will need a set of stock spring to be send out for data.

Above two measurement needs to be done on a level surface and the car needs to be in a condition representative of its “typical state”…driver and passengers, tank of fuel etc, so the weight / load is representative of how the car will typically be driven.
 
I just spoke to my race car fabricator, he can do corner measurements for me, but the setup & stuff is a little costly as I didn't tell him it was for me personally or he wouldn't charge me but I don't want that, how critical is it that the weights are from a stock springed fx? does that really make so much of a difference with the weight measurements?, I'd rather spend the $$$ measuring my own car rather than just someone elses stocker if it's about all the same really, does it really make that much difference as far as the corner weights alone? if it does then I should be able to get the stocker corner weights then anyway...

the other measurements & the stock springs available for testing are no problem, I can get that easily enough...

do you really think that stocker is the best starting point? why can't we start with like an H&R modified setup which is still going to be relative & a bit closer to the end goal at least to start with? not questioning your wisdom or methods or anything, just throwing it out there for thought... if we can measure everything from my car then we'd be closer to knowing what we need as an end result, but maybe stock is a better starting point too for some reason? ...
 
turbocad6 said:
I just spoke to my race car fabricator, he can do corner measurements for me, but the setup & stuff is a little costly as I didn't tell him it was for me personally or he wouldn't charge me but I don't want that, how critical is it that the weights are from a stock springed fx? does that really make so much of a difference with the weight measurements?, I'd rather spend the $$$ measuring my own car rather than just someone elses stocker if it's about all the same really, does it really make that much difference as far as the corner weights alone? if it does then I should be able to get the stocker corner weights then anyway...

the other measurements & the stock springs available for testing are no problem, I can get that easily enough...

do you really think that stocker is the best starting point? why can't we start with like an H&R modified setup which is still going to be relative & a bit closer to the end goal at least to start with? not questioning your wisdom or methods or anything, just throwing it out there for thought... if we can measure everything from my car then we'd be closer to knowing what we need as an end result, but maybe stock is a better starting point too for some reason? ...
Click to expand...

yeah, it's always best to start from a stock setup. This way we will have the baseline data to compare with. In addition, we are sending the stock spring for testing, not the aftermarket version. When you start cutting into the spring, all the characteristic changed.

Anyone has a stock FX ? I can probably get the corner weight measurement if I can get a stock FX in Long Island.
 
Sorry guys, name is Hogan, known the guys @ GT Spec for years.

Former Nissan Tech, ASE OBDII certified in 2004, Nissan service writer/advisor, shop foreman, ASM, SM before a GTR got me canned :) for destroying a tranny when advised in class not to beat on the car... currently work @ RPM NYC rpmnyc.com

New to the site, not new to Nissan/ Infiniti.

We have done alot of GT Spec's test fitting/ prototype modifications for Honda-Acura bracing products. Just don't get us outside of work w/ alcohol in our hands.... some employees are real WILD BOYS... lol...

---------- Post added at 09:31 PM ---------- Previous post was at 09:28 PM ----------
StuLax18 said:
S50 is code for the FX correct?
Click to expand...

Yes sir Stu


turbocad6, our address ???
RPM NYC
217 85 98th Ave
Queens Village, NY 11429
T: 718 740 3277
 
hey Hogan (S50 NYC) .. i didn't know you got a FX ... hahaha this could of been much easier :)

---------- Post added at 12:03 PM ---------- Previous post was at 12:00 PM ----------

We spoke to Swift Spring (Japan) ... and they are willing to do this project with us. Also we mentioned that for those who don't want coil over kit, they are willing to custom a set of lowering spring for stock struts for us.

It's a good option for those who don't want to do coil over. I will start another thread on just the lowering spring.

Just quick info .. what's the problem with the current springs available in the market ?

Need to be lower ? Need higher spring rate / lower spring rate ?
 
ust quick info .. what's the problem with the current springs available in the market ?

Need to be lower ? Need higher spring rate / lower spring rate ?
Click to expand...

we only have 2 choices (not counting Intrax) available to the FX market.

H&R are nice, but could be lower
Eibachs are low but have a few reported spring breakage

I would like to see springs at the 1.5 -1.75 range if possible, not sure if the spring rate needs to change up or down, but roughly the same rate as eibachs!?
 
theMerchant said:
we only have 2 choices (not counting Intrax) available to the FX market.

H&R are nice, but could be lower
Eibachs are low but have a few reported spring breakage

I would like to see springs at the 1.5 -1.75 range if possible, not sure if the spring rate needs to change up or down, but roughly the same rate as eibachs!?
Click to expand...


Agree with the Merch. H&R's are said to give the best ride, but are not low enough. Eibachs are lower but still see people cutting another half coil off to get the ride height they want, at least in the front. If you cut the rears a half coil..they tend to bottom out.

Also, Eibachs are seeing some spring breakage issues back east. Haven't seen any on the west cost.
 
to just build a set of springs best thing would be to mimick the eibachs, maybe add another 1/4" drop or so max & build them to be able to handle the load of the fx without fatique which would be a plus over the eibachs, maybe slightly stiffer than eibach to be able to deal with the reduced strut/shock travel too, that's about all your going to be able to do with springs alone on the fx & it'll still be pretty undervalved shock wise, especially in the rear... might want to think about supplying a shorter rear shock with more aggressive valving to pair with a set of lowering springs that are going to go as low as practical really...

big benifit of coilovers is going to be the ability to shorten the shock/strut so you can have increased wheel travel at lower heights & the ability to valve the struts/shocks much higher to match the higher spring rates that will also be necissary at these lowered ride heights. I dropped my stock spings off to hogan for you guys to play with, hopefully you guys have sucess in developing a coilover for the fx application. I think it's going to take some R&D though to get something that is going to ride low, but also handle well under all conditions... good luck to you guys with this...
 
GTSPEC said:
hey Hogan (S50 NYC) .. i didn't know you got a FX ... hahaha this could of been much easier :)

---------- Post added at 12:03 PM ---------- Previous post was at 12:00 PM ----------

We spoke to Swift Spring (Japan) ... and they are willing to do this project with us. Also we mentioned that for those who don't want coil over kit, they are willing to custom a set of lowering spring for stock struts for us.

It's a good option for those who don't want to do coil over. I will start another thread on just the lowering spring.

Just quick info .. what's the problem with the current springs available in the market ?

Need to be lower ? Need higher spring rate / lower spring rate ?
Click to expand...

Sounds like two very good possible options! Please keep us posted.
 
Probably a dumb question, but will a kit include camber bolts/arms, etc... to keep the alignment so the tires don't wear unevenly after this drop?

Front camber bolt kit is easily found but the rear -- being honest here still don't know which kit works off the shelf that is for the G35/350z. I never had to worry since H&R drop keeps it pretty much in the OEM range.
 
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