Ive had people comment on my 12\14 that have come from stock suspension , and climb in the car and are shocked when i tell them the spring rate , most dont believe me at all.... I dont personally think a stock evo rides good . But properly valved setups can really take the edge off.

I've felt some 8k megans that ride like **** , and ive felt ohlin DFVs at 10\12 my BCs at 12\14 and some tiens race at 10\12 that all felt above acceptable.

And many KWs that ride nice and handle like crap

Oh and WTF is the turbo results ive been trying to find?

 

WHAT SUSPENSION IS CURRENTLY ON YOUR EVO?
custom Moton "motor clubs"

WHAT PRICE DID YOU PAY FOR YOUR SUSPENSION?
ehh, over 5k

ARE YOU GOING TO RUN THE STANDARD SPRINGS RATES THAT COME ON THE COIL OVERS YOU INTEND TO BUY OR SOMETHING CUSTOM?
Custom spring rates/ custom valved, custom roadrace settings

WHAT ALIGNMENT SETTINGS DO YOU RUN/PLAN TO RUN AND DOES IT CHANGE FROM THE TRACK TO THE STREET?
-3, -2, i daily drive the car like this as well, but i also do alot of spirited driving so the wear isnt too bad
WHAT SIZE TIRE WILL YOU BEING COMPETING ON?
Right now 255/40/17... soon to upgrade to a 275

WHAT TYPE OF TIRE WILL YOU RUN MOSTLY?
DOT race tire and/or full race tire..

 

Ride quality has much more to do with the quality of the damping and valving than the spring rate. To illustrate this a shop owner with a 350z race car with 1300 lbs/in spring in the rear showed me how the car bounces up and down like any other springs when the shock absorbers weren't in. It was quite impressive. Controlling the ride motions was totally up to the job of the dampers.

 

Ride quality...as it's a qualitative and highly opinion based judgement here...

I only had the stock suspension on my car for a week. In that week, I got caught in rush hour traffic and by the time I made it 30 miles home at 15mph, my back literally hurt for a week from the expansion joints. The damping on the stock suspension at those speeds beat the **** out of me.

I put about 12k miles on my 10k/14k setup. In that time, I got caught in similar traffic numerous times and never once ended up with a sore back from the ride.

Only other qualitative measurement that has been made on my car by others... it makes bewbies bounce...

 

WHAT SUSPENSION IS CURRENTLY ON YOUR EVO?
Ohlins DFV road and track
WHAT PRICE DID YOU PAY FOR YOUR SUSPENSION?
a lot
ARE YOU GOING TO RUN THE STANDARD SPRINGS RATES THAT COME ON THE COIL OVERS YOU INTEND TO BUY OR SOMETHING CUSTOM?
NO, currently on 10/12 and its way to soft. planning to switch to 12/16 soon
IF YOU ARE GOING TO RUN A CUSTOM SPRING RATE WILL YOU BE PAYING TO HAVE THE COIL OVERS RE-VALVED?
Maybe, cannot confirm if ohlins can handle 16k rears yet, gtworx said they have done 12/14 without a revalve.
WHAT ALIGNMENT SETTINGS DO YOU RUN/PLAN TO RUN AND DOES IT CHANGE FROM THE TRACK TO THE STREET?
-2.3/-1.3 varying slightly
WHAT SIZE TIRE WILL YOU BEING COMPETING ON?
245/40/17
WHAT TYPE OF TIRE WILL YOU RUN MOSTLY?
Street tire tread wear 140 or over. dunlop star specs

I was not a believer of valving until i've been driving/racing on various setups. everyone says a 10/12 rate is unbearable on the evo. but with the ohlins its insanely soft, too soft for me actually. the dampening on the ohlins is a night and day difference than my BC's 14/12 on my integra and the horrid stock evo8 suspension. i daily drive the evo with these rates, its too soft for the ohlins.

 

Wow jumping to a 12\16 is going to rotate the rear end like crazy , what kind of events do you compete in? And what are your thoughts on being so stiff on a street tire?

 

I used to run 10k/12k and I thought it was fine. I'd drive 500 mile roundtrip to tracks with a set of tires in the backseat and it handled the interstate roads just fine.

Now before that setup, I ran a 10k/14k setup and did the same thing. Night and day difference with this one being much more rough. I think this was more a question of ride height and lack of droop travel though - as this setup was really low. Going over interstate overpasses my butt sometimes came out of the seat as they didn't have enough droop to safely absorb that stuff.

I think the worse part was the race seat and having pulled most of the sound deadening. I can take few bumps, but when it's louder than normal for long interstate runs, that's what gets annoying.

Like having to slow down 20mph (to reduce rpm's) to make a phonecall!

 

Thanks for the input everyone.

I started charting the information from here and highboostforums to get an idea what the typical set ups are. It's funny how my brain gets zoomed in on one thing and I don't see all the information, haha. Sheesh, good thing I put this into a chart so I get accurate information and not just what I decide to pick and choose!

N1's, Ohlins and KW's are tied for coil over suspension choices now at 4 a piece.
The most common choice is stock with springs.
Most common front spring rate 8k.
Most common rear spring rate, 6 way tie ranging from 6k to 14K+.
27 guys run 1.5 degrees or less rear camber while only 3 run more than that.
21 guys run street tires
7 race tire guys
19 guys run 255 width or less
4 run 265-275
4 run 285+
Front camber tie for first is 1.6-2.0, 10 guys and 2.6+ at 10 guys.

I will keep compiling this data until I do an actual test so keep the input coming. Maybe by the time I do it I will end up testing more than two set ups.

 

You might want to evaluate the spring bais ratio front to rear, along with actual spring rates. The front to rear bias may have a larger overall impact on handling attitude then the actual apring rates.

For example, 10k/14k is a 1.4 ratio, where 12k/16k is a 1.33 ratio. Despit having a lower overall rate, the 10k/14k bias may actually be more tail happy.

 

WHAT SUSPENSION IS CURRENTLY ON YOUR EVO?

OHLINS R/T

WHAT PRICE DID YOU PAY FOR YOUR SUSPENSION?

$3k installed

IF YOU HAVEN'T BOUGHT A SUSPENSION YET WHAT PRICE RANGE ARE YOU LOOKING AT? 0-$500. $500-$1000. $1000-$2000. $2000+.

ARE YOU GOING TO RUN THE STANDARD SPRINGS RATES THAT COME ON THE COIL OVERS YOU INTEND TO BUY OR SOMETHING CUSTOM?

Custom.

IF YOU ARE GOING TO RUN A CUSTOM SPRING RATE WILL YOU BE PAYING TO HAVE THE COIL OVERS RE-VALVED?

Had them do the valving at purchase.

WHAT ALIGNMENT SETTINGS DO YOU RUN/PLAN TO RUN AND DOES IT CHANGE FROM THE TRACK TO THE STREET?

Same for the street/track. -3 front camber, -1.5 rear camber. 0 toe/caster

WHAT SIZE TIRE WILL YOU BEING COMPETING ON?

255 35 18 Star Spec street tires
285 30 18 Hoosier A6

WHAT TYPE OF TIRE WILL YOU RUN MOSTLY?

The Hoosier A6 for competition. Star specs for street.

 

I had the MR Suspension on my car and can honestly say that the Ohlins ride as good if not better. The only time I have issues is where PennDot fails at paving a street and results in a nice wave. It seems that the rebounds are all timed perfect and you feel like you are cruising in a boat out at sea. That is the rare exception.

 

Very good point.

 

Hope you can make a video of your experiment.. if the time permits...

 

Where would 13/16 put the ratio at? How do you calculate this? What is the ratio number to target when doing this?


Thanks!

 

They're simply dividing the big number by the small number.^