Yellow Speed Racing coilovers

OurCognitiveSurplus · Postby **OurCognitiveSurplus** » Wed Mar 14, 2012 1:48 pm

project.r.racing wrote:Thoughts on front/back sping ratios has been discussed in this thread. Read a few pages back.

I read the thread a third time and can't find anything about front back spring rate ratios and car balance. Perhaps I'm dense.

plohl · Postby **plohl** » Wed Mar 14, 2012 2:12 pm

are you after the spring rate? 8kg/mm and 6kg/mm (can't remember what the pro's rates are)

or the ratio between the spring rates? 8/6 = 1.333 or 6/8 = 0.75?

or another ratio all together? (FCM calculator maybe?)

project.r.racing · Postby **project.r.racing** » Wed Mar 14, 2012 2:15 pm

OurCognitiveSurplus wrote:
project.r.racing wrote:Thoughts on front/back sping ratios has been discussed in this thread. Read a few pages back.

I read the thread a third time and can't find anything about front back spring rate ratios and car balance. Perhaps I'm dense.

No you are not dense. Wrong thread suggestion from me. This is the correct one:-

viewtopic.php?f=30&t=50530&p=635787&hilit=spring+ratio#p635787

OurCognitiveSurplus · Postby **OurCognitiveSurplus** » Wed Mar 14, 2012 2:34 pm

project.r.racing wrote:Wrong thread suggestion from me. This is the correct one:-

viewtopic.php?f=30&t=50530&p=635787&hilit=spring+ratio#p635787

Yes, I've read this thread and found it very interesting. I think the linked thread convinced me of the merit of the 3kg/mm:2kg/mm ratio. YSR 8kg/6kg misses that ratio in favour of over-steer. Xida, after conversion, has 8kg/5.3kg - which seems ideal (the US approach to measuring spring rates is also more granular than the aussie approach).

I'm interested in people's experiance with 8kg/6kg in NA/NB to confirm or argue against the discussion in the linked thread. It is possible, for instance, that when YSR say 8/6 there might be some rounding involved and it's more of a 8.3/5.5 ratio (measuring in whole kg is a bit odd really).

Anyway, I'd just like to hear about the balance of the car from these YSR owners with NA or NB and the '8kg/6kg' springs when used on a track/hill climb.

kurumasen · Postby **kurumasen** » Thu Mar 15, 2012 12:53 pm

1st post!

Just bought myself a pretty much bone stock NB8A last week and got a set of YSR pro sports waiting to go in. Will be going in this Sunday, I'll let you guys know how it all goes and if there are any issues!

Vic

emx005 · Postby **emx005** » Sat Mar 17, 2012 2:27 pm

kurumasen wrote:1st post!

Just bought myself a pretty much bone stock NB8A last week and got a set of YSR pro sports waiting to go in. Will be going in this Sunday, I'll let you guys know how it all goes and if there are any issues!

Vic

Grats! I've had no issues at all with mine in my NA6. Even my wife who originally didn't like the stiffness loves driving the car even more once she got used to them.

kurumasen · Postby **kurumasen** » Mon Mar 19, 2012 8:24 am

Just got them in yesterday, installation went pretty smoothly. Had a bit of trouble squeezing the old front ones out without taking off the wishbone ball joints, but putting the new ones in were much easier (ysr unit shorter than stock)

I had 330mm from guard to center of hub all round to begin with, after using the recommended installation settings it dropped to 320mm and will probably go down a bit more after it settles down.

I set off on my 1st test drive with the shocks on the lowest setting, 0. The first thing I noticed was how much more comfortable the ride was with the new shocks, before my suspension would crash a bit over rough roads but the new shocks soaked up the bumps noticeably better. But the softest setting had too much roll for my liking, and noticeably more than with the stock shocks. I've got 130k kms on the NB, I'm guessing the old shocks were the original and never been replaced.

Then I went up to 8 clicks all round, the recommended street driving setting. The shocks firmed up noticeably and steering response was alot better. The ride firmed up a bit but still pretty comfy.

I'll let them settle a bit over a couple of weeks before I readjust the height or shocks, but overall super happy with what I got. One thing I will say is the rear end feels proportionally more twitchy to the front than stock. I think stock spring rates are 3/2 but the ysr's are 8/6, so the fronts are 2 and 2/3 times stiffer but the rears are 3 times stiffer. In the crazy downpour we got in sydney last night it was noticeably alot easier getting the arse out around corners (I suppose a used set of coilovers and bunch of tools in the boot didnt help). Just gotta take it easy in the rain i suppose. First mod I've done to my car, glad it went well and i got results

rossint · Postby **rossint** » Mon Mar 19, 2012 10:01 am

Did you get an alignment done? If not you'll need one.

kurumasen · Postby **kurumasen** » Mon Mar 19, 2012 12:47 pm

Yeah, I'll go get a wheel alignment as well. From driving it yesterday it feels like the rear is toed in if that's even possible from lowering it. Rears have a bit more camber too.

Anyone out there got any suggestions (preferably tried and tested) on a good wheel alignment setup for NBs in terms of camber/toe/castor? Cheers

Vic

Regie · Postby **Regie** » Tue Mar 20, 2012 11:39 am

kurumasen wrote:Yeah, I'll go get a wheel alignment as well. From driving it yesterday it feels like the rear is toed in if that's even possible from lowering it. Rears have a bit more camber too.

Anyone out there got any suggestions (preferably tried and tested) on a good wheel alignment setup for NBs in terms of camber/toe/castor? Cheers

Vic

there are plenty of good places...we cant really help not knowing where you are from though

Forest · Postby **Forest** » Tue Mar 20, 2012 9:22 pm

I have done about 600km on my Dynamic Pro Sports and I am very happy. They are firm but compliant and the performance is fantastic. The KYBs & S techs they replaced were shot so perhaps the change for me is more dramatic. I have upped the damping for the third time, after reading this thread again, to front 20 & rear 16 and agree that it gets better with more damping. I was initially concerned that 8kg & 6kg springs would be too harsh and moved away a little from a 3/2 spring ratio but I should not have worried there is obviously a reason manufacturers use 8/6kg and it suits me.

I have noticed some wheezing over speed humps etc, I'm hoping its just the dust boots. Has anyone else experienced this? Should I talk to Mania about it?

Cheers

kurumasen · Postby **kurumasen** » Wed Mar 21, 2012 9:21 am

Regie wrote:
kurumasen wrote:Yeah, I'll go get a wheel alignment as well. From driving it yesterday it feels like the rear is toed in if that's even possible from lowering it. Rears have a bit more camber too.

Anyone out there got any suggestions (preferably tried and tested) on a good wheel alignment setup for NBs in terms of camber/toe/castor? Cheers

Vic

there are plenty of good places...we cant really help not knowing where you are from though

I'm in Artarmon Sydney, I know a couple of places around me. Just not sure on the range of alignment specs that'd run good on an NB

Suspense · Postby **Suspense** » Wed Mar 21, 2012 1:47 pm

kurumasen wrote:I'm in Artarmon Sydney, I know a couple of places around me. Just not sure on the range of alignment specs that'd run good on an NB

Is your car black? I'm in Artarmon too and have seen a black NB parked nearby several times in the last couple of months, just up from the station.

Best place for an alignment in Sydney for an MX5 is Spinning Wheels in Waterloo.

kurumasen · Postby **kurumasen** » Wed Mar 21, 2012 2:02 pm

nah, that's not me, mines green. i'm near the lane cove end of artarmon. thanks for the recommendation, i'll go check them out!

Jimi · Postby **Jimi** » Sun Mar 25, 2012 2:14 pm

Another update - now been running the Sport yellows for 5000km on my NA and the verdict is they're great.

Best overall settings I've found are 24 front, 20 rear, plus raise the rear perch height ~10mm to give more rear compressive travel (i.e. run a little pre-load to lift the shocks off the bumpstops). This helps a lot on the rougher roads and concrete sections of road like Parramatta rd.

I couldn't imagine people are having trouble getting them low enough!!! I am miles above minimum height adjustment at front and rear, and am still borderline getting over speed humps.