Spring Rates VS Ride Height VS Bump Travel (Calculations...)

Suspension and other discussion

Re: Spring Rates VS Ride Height VS Bump Travel (Calculations

Postby MWP » Thu Oct 30, 2014 8:44 am

^^ yup that :)

All finished and back in the car today.
Haven't taken it on a decent test drive yet though.
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Re: Spring Rates VS Ride Height VS Bump Travel (Calculations

Postby EvanP246 » Thu Oct 30, 2014 11:29 am

Have you all considered the orientation of the axles?

Doesn't It negatively affect the handling if they are angled upward? I have heard that they have to be angled downward or level for the optimum handling.

This is how my car currently sits on TEIN SS. I would like to go about a quarter inch lower but the axles are parallel with the ground as it sits.

Image

I have an AW11 steering flip kit to install, so bump steer shouldn't be an issue.

What are your thoughts on this?
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Re: Spring Rates VS Ride Height VS Bump Travel (Calculations

Postby MWP » Tue Nov 11, 2014 5:03 pm

All done and working brilliantly.
100x better than the old progressive lowering springs and KYB ExcelG inserts.

The soft'ish springs and adjustable digressive compression damping means the car handles like the springs are stiff, but i can hit big bumps, potholes, etc and they soak em up as if the springs are soft.

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Re: Spring Rates VS Ride Height VS Bump Travel (Calculations

Postby CMS-GT4 » Fri Dec 12, 2014 3:06 am

So I had been talking to someone else who builds housings for these about using them in the alltrac. Did not know much about them until my research began this week when looking into my future setup. I am considering a custom set of coilovers using these struts. So far your response is one of the few that answers what I want to know (but could not find), which is how they handle rough pavement.

Now here are my other questions now that I found someone with a similar application.
* Why king springs over swift or hyperco?
* How much shorter is the new assembly than the factory struts?
* How much lower is your car at your new settings?
* At full compression do your tires rub anywhere?
* What tire size?

Thanks.
Coldiron
92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
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Re: Spring Rates VS Ride Height VS Bump Travel (Calculations

Postby MWP » Fri Dec 12, 2014 3:22 am

Why king springs over swift or hyperco?


Because Australia (King Springs are made here).

I made a slight mistake with the springs, i should have got 250mm long springs, not 200mm.

How much shorter is the new assembly than the factory struts?


Longer, not shorter... by about 5mm.
I took about 10mm off the mid section of the tube, and added about 15mm on the bottom.

One of the 8611 koni inserts that is slight shorter may have been a better option.
These 8611-1259 will do the job for me though.

How much lower is your car at your new settings?


Its higher. The car was too low on the old springs.
Front wheel eyebrow height is now set at 345mm (lowest legally allowed here).

At full compression do your tires rub anywhere?


Nope.

What tire size?


Currently 225/45/17 on a 17x7 +41 wheel.
Soon to be 17x8 +35 (OZ Chronos).
My collection of GT4 documentation: http://gt4.mwp.id.au
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Re: Spring Rates VS Ride Height VS Bump Travel (Calculations

Postby CMS-GT4 » Fri Dec 12, 2014 3:49 am

I see. Thanks for the reply. Since my housings would be made from scratch my spindle mounting points could be where ever it needs to be. Your specs won't help me much since your running higher. I will be about 1.9" lower than stock. I guess I will have to crunch more numbers and see if these will work for me at the height I want
Coldiron
92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
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Re: Spring Rates VS Ride Height VS Bump Travel (Calculations

Postby MWP » Fri Dec 12, 2014 4:04 am

Well ive made the tube as low as it can go without fouling on the CV boot.

To go lower without loosing bump travel youll have to use super short inserts (8611-1257), or modify your towers (like TTE WRC cars were).
Im not sure if the 8611-1257 will have the same nice digressive compression damper valving that the 1259 do.
My collection of GT4 documentation: http://gt4.mwp.id.au
Daily: Celica GT4 ST185 (~170kw/atw)
Project: Toyota RA28 '77 Celica (1UZ-FE powered)
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Re: Spring Rates VS Ride Height VS Bump Travel (Calculations

Postby CMS-GT4 » Fri Dec 12, 2014 4:15 am

The place that makes the housing makes them for the 8611-1257 already, so that may be my option. Its shorter than the 8611-1259 and might do what I need. Guess I'll start making a part list and see what I can work out vs off the shelf.
Coldiron
92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
www.noritoy.com | noritoy.deviantart.com | http://www.alltrac.net/phpBB2/viewtopic.php?f=44&t=19891
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