Impressions 400lb F / 500lb R springs - MR2 Owners Club Message Board
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post #1 of 10 (permalink) Old April 17th, 2017, 21:49 Thread Starter
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Impressions 400lb F / 500lb R springs

I tried a new setup this year..

I upped the spring rates considerably. I went from the Standard
4k (224lb) F w/OEM bar / 8k (448lb) R no sway bar

TO

400lb F w/OEM bar / 500lbR no sway bar. Springs are Hypercoil 2.5" ID 8" long springs F and R

All I can say is WOW! Feels like an MRS almost. more nimble, easier to throw into corners, more predictable, easier to push at the limit... Why did I not do this 10 years ago. Can't wait for the first track event at Gingerman.

I have these on newly rebuilt Apexi PRO N1 Monotube Dampers. They can handle the high springs rates without issue. This setup drives nicer than my old 4k/8k setup.... like everyone says, it's all about the dampers, not the springs.


I also have full spherical bearings on the car. cusco Tension rods, PDoane trailing arm sperical bearings inserts (Thanks PDoane for the Prints), spherical Top hats... (Apexi Top hats and TONS of camber adjustment BTW) T3 Adjustable tow links to get rid of the Bumpsteer, 25mmRCA's in Front and 15mm RCA's in the rear.

What a car!!! I love spring for this reason. Always feel like a kid again

One small issue is that I can't lower the car enough in front with the 8" long Springs up front and Apexi Coilover mounts. These coilovers came with 7" long springs... I'm just finishing up a set of all Billet CNC'd Aluminum Coilover mounts/housings to replace the Apexi mounts so I can lower the car to proper ride height, Less unsprumg mass is always better
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post #2 of 10 (permalink) Old April 17th, 2017, 22:15
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I only ran those rates briefly before going up to 550/700, but the front to rear ratio is about the same. I also run a front bar only. Overall, love it! In my opinion nearly all of the off the shelf coilovers / spring setups for the MR2 have WAY too much rear spring rate (or not enough front rate, depending on how you look at it). It IS a bit stiff for street use, but its awesome on the track, which is the main purpose of the car at this point.

If you are having trouble getting low enough, just switch to 7" springs. That's what I run on my coilover builds, for that reason.


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A retro-active build thread for my track / autocross car

Last edited by Alex W; April 17th, 2017 at 22:20.
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post #3 of 10 (permalink) Old April 18th, 2017, 05:40
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My ITA car has 400F and 450R (also 2.5" dia 8" long) with ST sway bars at both ends. It handles great. Glad you like the spherical inserts. Really frees up the bushing bind to let the springs and shocks do the work.
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post #4 of 10 (permalink) Old April 19th, 2017, 07:13
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I have much softer but still stiff springs, 250lb in the front with 300lb in the rear. I enjoy it a lot, it's a much firmer ride, though bumps are pretty harsh.
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post #5 of 10 (permalink) Old April 19th, 2017, 10:00
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Quote:
Originally Posted by achulz View Post
I have much softer but still stiff springs, 250lb in the front with 300lb in the rear. I enjoy it a lot, it's a much firmer ride, though bumps are pretty harsh.
What shocks? Those spring rates really shouldn't be all that harsh (although it is a very subjective thing).


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A retro-active build thread for my track / autocross car
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post #6 of 10 (permalink) Old April 19th, 2017, 11:01
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Quote:
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What shocks? Those spring rates really shouldn't be all that harsh (although it is a very subjective thing).
Stock shocks (I know, I know...)

I will be getting Tokico strut inserts though. Like I said, the springs aren't that bad, they are just a lot stiffer than the progressive Eibachs I had on there. I love them way more though, so much less body roll.
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post #7 of 10 (permalink) Old April 24th, 2017, 13:14 Thread Starter
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Billet Aluminum CNC'd Coilover housings complete! I could have bought 7" springs, but I designed in 0.5deg more camber into these at the hub mounting holes. No more need for Crash bolts. These are nice!





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post #8 of 10 (permalink) Old April 24th, 2017, 13:19
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What shocks will you be using? That looks awesome.
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post #9 of 10 (permalink) Old April 24th, 2017, 18:52
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Quote:
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...I will be getting Tokico strut inserts...
Unless your stock shocks were blown already from the ride height change, Tokicos won't help a harsh ride over bumps - they may even compound the issue.
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post #10 of 10 (permalink) Old April 25th, 2017, 06:14 Thread Starter
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No Tokico's for me...

I'm using the Apexi Pro N1 monotube dampers. They have a M58 x 2mm thread pitch (for ride height adjustability). I have to put that thread on the ID of those housings still.... These dampers are increadable! The best ride with any spring rate you put with them. None of that annoying bounce in the front, soaks up bumps in the road... That fact that people put megan, and other cheap brands on our cars is a disgrace. They only make the car worse.

There's a nice set of Ohlins on ebay right now. I'd love to see someone pick those up and rebuild them. those are nice units as well.
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