Advanced Suspension, Chassis, and BrakingTalk about suspension geometry, advanced handling/chassis setup, custom brakes, etc. NOT your basic brake pads and "best drop" Information.
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This thread is for spring rates for all available springs on Maximas/I30/I35s. Post away, and I will update this top post as new submissions arrive. Hopefully one of our moderators will sticky this so it can become a solid reference material.
Please specify spring brand, car year, linear or progressive rate, and whatever rate is available.
Progress Technology:
Front : 165 lbs/in
Rear : 250 lbs/in
(according to a different, unconfirmed source the rates could be 165-250 lbs/in in the front and 179-285 lbs/in in the rear.)
Canuck Motorsports..Progressive rate
front initial rate 125 (high rate not supplied)
rear (probably linear) rate 320
6th Generation Maxima
Infiniti I30
Infiniti I35
__________________ Sold: 2000 Maxima SE - PR Intake - Frankencar CB - Truax SFCs - Wilwoods - Eibachs - Blehm LTB - Cattman Ypipe
Stillen RSB - RSTB - FSTB - ES Bushes - G wheels - Raxles - Mach1 lip - Illuminas - and plenty more
For those trying to compare the 9kg/7kg or 8kg/6kg, etc. Front/Rear rates of coilovers with lowering spring rates, the following was provided by Larrio:
Quote:
Originally Posted by Larrio
To figure out kg to lb difference:
metric rating - 1mm down travel per 9kg of weight
standard rating - 1 inch down travel per 500 lb weight
just take 9kg multiply by 25.4 (mm to inch) and then by 2.2 (kg to lbs)
9 x 25.4 = 228.6
228.6 x 2.2 = 502.92 lb/inch
The overall conversion is so close to 56 lb/in for every Kg/mm that a calculator is hardly necessary.
If anybody is interested, I have a little (~570k) conversion software called 'Convert.exe', into which I've added the Kg/mm <=> lb/in and a few other metric/English conversions.
Ground controls sleeve coilover default rates are 450 front an unknown "proprietary" rate in the rear, that I estimate to be 350lbs (since Eibach ERS springs are only available in increments of 50lbs/in).
Don't know if this is true but I've been assuming it is for the past 4 years. For $50 one could test em by I've spent enough already on silly baselines.
GXE model OEM springs are 200LB/IN linear rate.
SE model OEM springs are 250LB/IN linear rate.
Ground controls sleeve coilover default rates are 450 front an unknown "proprietary" rate in the rear, that I estimate to be 350lbs (since Eibach ERS springs are only available in increments of 50lbs/in).
my rears say 150 of some proprietary rate. the fronts are 450. pretty big difference if you ask me...
my rears say 150 of some proprietary rate. the fronts are 450. pretty big difference if you ask me...
they aren't 150 trust me, that's softer than stock and they sure as hell ain't softer than stock lol. GC won't tell what the rate is though because they say it took a long time to develop, etc.
__________________ 95 SE - Stock 3.0L w/ USIM - T61/P-trim @ 14.5psi - 93 octane
11.76 @ 121 - 1.82 60' - ET Street DOTs
12.15 @ 123 - 1.95 60' - Nitto DR 3.5L swap with I/Y/E
12.92 @ 104 - 1.69 60' - M&H Slicks
13.60 @ 103 - 2.15 60' - Street tires
GC won't tell what the rate is though because they say it took a long time to develop, etc.
I've never understood that position. It's not like anybody is requesting the specific design dimensions that were chosen to end up with that rate (so that the design could be copied for the cost of a phone call vs having to buy one set of springs - ???). Just the end result, like the "drop" numbers that are so readily available. Why the rate number would need to be considered any more sensitive than the "amount of drop" makes little sense.
I've never understood that position. It's not like anybody is requesting the specific design dimensions that were chosen to end up with that rate (so that the design could be copied for the cost of a phone call vs having to buy one set of springs - ???). Just the end result, like the "drop" numbers that are so readily available. Why the rate number would need to be considered any more sensitive than the "amount of drop" makes little sense.
Norm
which is why GC is not very popular with the racing crowd.....who mostly sway toward Eibach, who are happy to tell you the rates that you're getting. GC's are for the "import tuner" crowd who are more interested in looking good, which is why the "amount of drop" is always the #1 stat. Not saying that some GC setups don't perform well, but it's always gonna be a guessing game with them.
general spring rule: No rate availabe = no buy.
__________________ Sold: 2000 Maxima SE - PR Intake - Frankencar CB - Truax SFCs - Wilwoods - Eibachs - Blehm LTB - Cattman Ypipe
Stillen RSB - RSTB - FSTB - ES Bushes - G wheels - Raxles - Mach1 lip - Illuminas - and plenty more
which is why GC is not very popular with the racing crowd.....who mostly sway toward Eibach, who are happy to tell you the rates that you're getting. GC's are for the "import tuner" crowd who are more interested in looking good, which is why the "amount of drop" is always the #1 stat. Not saying that some GC setups don't perform well, but it's always gonna be a guessing game with them.
general spring rule: No rate availabe = no buy.
You do know that GCs use Eibach ERS springs I assume. You can get whatever rate you want, a non proprietary rate, but the default rate in the rear some big secret. The fronts springs are normal Eibach ERS nomenclature, model number indicates the spring length, diameter, rate, etc.
__________________ 95 SE - Stock 3.0L w/ USIM - T61/P-trim @ 14.5psi - 93 octane
11.76 @ 121 - 1.82 60' - ET Street DOTs
12.15 @ 123 - 1.95 60' - Nitto DR 3.5L swap with I/Y/E
12.92 @ 104 - 1.69 60' - M&H Slicks
13.60 @ 103 - 2.15 60' - Street tires
I remember seeing 4th gen oem se springs as 120f 200r
Also the SE rear springs are the stiffer ones, the fronts are the same between models. (they do differ between transmissions),
I emailed them CMS directly for these numbers:
Canuck motorsports spring rates:
04+: 190 front 340 rear
00-03: 125 front 320 rear
95-99: 125 front 255 rear
89-94: 170 front and rear
all are in lbf/in and progressive rate.
Also Ground Controls rear springs are in metric units. I belive my GC rears are 64 N/mm which is equal to 365lbf/in. The fronts are in standard units, mine are 450 lbf/in. To read GC ERS springs the 1st number is the length, the 2nd is diameter, and 3rd is spring rate ie:
0800.250.0350 is an 8" long spring, 2.5" diameter, and 350 ibf/in
You shouldn't be posting in this thread, post in one of the general 5th gen suspension threads. Or better yet, go comment on some threads in the Members' Rides forum until you can make a new post.
Boss Chen coilovers: 8 kg/mm front 6 kg/mm rear. This is for 4th gen but I believe the 5th gen come with the same. And I think Larry will use different spring rates if you so request.
You know this always bothered me--stock 4th gen rates are NOT 200F/R GLE and 250F/R SE. That is WAY too stiff relative to all the aftermarket options, which are ALL significantly stiffer than stock. In addition, the front and rear spring rates are going to differ due to the fact that the front is significantly heavier and you generally want the front wheel rate to be higher than the rear wheel rate to dial in more understeer for cars off the factory.
My guess is the fronts are around 100lb/in and rears are like 70, this is probably way more accurate than 250/250. I could feel the front of my 4th gen lift when it had stock suspension and I got on it.
Agreed, but that's the only thing published from late 90's I've seen. I'll have my OEM springs off in a couple weeks, shouldn't be hard to throw one or two 50lb salt blocks on the end of one and get a decent compress figure.
I dunno, my coilovers are over 400 lbs/in in front and they feel only about twice as stiff as stock...
You are either dead wrong or all the other spring rates are wrong. Eibachs are the stiffest or close to the stiffest spring out there, and you're going to say that they're softer than or equal to stock? Have you RIDDEN in a stock Maxima?
Bottom line, no offense but a hunch as to "about twice as stiff" is not good enough to base any argument on. I could go over reasons but they should be obvious.
Ya man except you're basing your opinion on the same hunch! In fact, you're trying to deny the numbers because of the way your suspension feels to you. Not very scientific.
My car was on stock SE suspension for a while. I don't believe I've spent much time in a GLE or GXE but I assume they feel like any other sedan from that era. However, I was on Illuminas and H-Techs for a couple of years between the stock suspension and coilovers.
Morpheus and JSutter were both spot on. While changing tires I pulled one of the front struts off. The spring measured is about 10yrs old and bought used so I can't verify if it's an SE or GLE. With 50lbs it compresses .67" and 100lbs is .95". Anybody got a loose rear spring laying around?
Thanks for measuring, Bejay. According to JSutter's post above, the front springs are the same among all trim levels but the SE rears are stiffer. So the question is actually whether those are auto or 5-speed stock springs. And at 10 years old I wonder how much it's softened.
Spring rates don't soften over time, unless perhaps there has been enough corrosion to reduce the wire diameter. Otherwise, softening a spring would require a change in the basic material stiffness property, an increase in the mean coil diameter, or an increase in the number of active coils. I don't think so.
But they can take a permanent 'set' due to (over)loading, which gives a similar appearance. That's an "energy per unit volume" thing where the energy comes from the weight supported and the amount of spring deflection (including how far it moves during bump conditions).
The contribution to suspension ride stiffness provided by the control arm bushings may have dropped over that length of time though.
Forgot these particular springs have only been installed half those years as I usually run in just winter. They definately haven't taken a "set" as I still have 5-6 finger wheel gap up front.
Linear Mode
