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Old 04-22-2018, 04:55 AM   #57
notout86
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I'm also in the 70+ age range. Believe it or not, sticking with the non-PP wheels, tires, suspension AND using a good gel pillow for my wife (who weighs less than 100 lbs), works best. It turns out that the thin padding on the seats transfers the jarring and when that is subdued, the ride seems a lot smoother. I'm thinking about having extra padding put in the bottom of the seat. We actually have a similar problem in our SUV, believe it or not, and she uses the cushion there as well.
I trialled a couple of gel cushions and one does exactly what I wanted. The jarring and jiggly ride now feels nicely damped so much so that I think everyone should give it a try. All it cost was $20 Australian and I know I could have spent a heap on spring/damper experimentation and maybe never have got it to feel right. I reckon the o.e. seats could have been tuned by the makers to much better match the suspension. The feeling I get is that the wheels are more stuck on the road even though the suspension is the same and I am inclined to throw the car around more.
The tradeoff is a feeling of being perched up on the seat rather than down in it and not located by it as much resulting in a a slight feeling of wallowing and body roll which you would expect. I have lowered the seat to the max to compensate and got used to it quickly. Previously I had the seat raised about 40mm.
The cushion I like is 430 X 330 X 60 mm and quite heavy due to a generous bag of gel inside a cover of quite soft 30 mm foam both top and bottom and around the sides. It is not memory foam. My feeling is that is the gel that is doing most of the work. Maybe getting rid of the foam and just using the bag in your seat would do the trick and be better than adding extra padding. Widthwise it is a perfect snug fit between the side bolsters but I will be trimming the foam to fit back between the seat-back bolsters. It could do with an hollow for the wedding tackle too and maybe a little foam off the front as it presses on the back of my thighs up by the knees. At $20 I can afford experimenting.
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Old 04-22-2018, 05:22 PM   #58
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Originally Posted by notout86 View Post
I trialled a couple of gel cushions and one does exactly what I wanted. The jarring and jiggly ride now feels nicely damped so much so that I think everyone should give it a try. All it cost was $20 Australian and I know I could have spent a heap on spring/damper experimentation and maybe never have got it to feel right. I reckon the o.e. seats could have been tuned by the makers to much better match the suspension. The feeling I get is that the wheels are more stuck on the road even though the suspension is the same and I am inclined to throw the car around more.
The tradeoff is a feeling of being perched up on the seat rather than down in it and not located by it as much resulting in a a slight feeling of wallowing and body roll which you would expect. I have lowered the seat to the max to compensate and got used to it quickly. Previously I had the seat raised about 40mm.
The cushion I like is 430 X 330 X 60 mm and quite heavy due to a generous bag of gel inside a cover of quite soft 30 mm foam both top and bottom and around the sides. It is not memory foam. My feeling is that is the gel that is doing most of the work. Maybe getting rid of the foam and just using the bag in your seat would do the trick and be better than adding extra padding. Widthwise it is a perfect snug fit between the side bolsters but I will be trimming the foam to fit back between the seat-back bolsters. It could do with an hollow for the wedding tackle too and maybe a little foam off the front as it presses on the back of my thighs up by the knees. At $20 I can afford experimenting.
Glad it worked out for you. I guess a more permanent solution would be to get butt implants!!!!!! Both my wife and I sit rather low so raising us an inch or so is actually better....
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Old 04-22-2018, 08:30 PM   #59
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Originally Posted by notout86 View Post
I trialled a couple of gel cushions and one does exactly what I wanted. The jarring and jiggly ride now feels nicely damped so much so that I think everyone should give it a try. All it cost was $20 Australian and I know I could have spent a heap on spring/damper experimentation and maybe never have got it to feel right. I reckon the o.e. seats could have been tuned by the makers to much better match the suspension. The feeling I get is that the wheels are more stuck on the road even though the suspension is the same and I am inclined to throw the car around more.
The tradeoff is a feeling of being perched up on the seat rather than down in it and not located by it as much resulting in a a slight feeling of wallowing and body roll which you would expect. I have lowered the seat to the max to compensate and got used to it quickly. Previously I had the seat raised about 40mm.
The cushion I like is 430 X 330 X 60 mm and quite heavy due to a generous bag of gel inside a cover of quite soft 30 mm foam both top and bottom and around the sides. It is not memory foam. My feeling is that is the gel that is doing most of the work. Maybe getting rid of the foam and just using the bag in your seat would do the trick and be better than adding extra padding. Widthwise it is a perfect snug fit between the side bolsters but I will be trimming the foam to fit back between the seat-back bolsters. It could do with an hollow for the wedding tackle too and maybe a little foam off the front as it presses on the back of my thighs up by the knees. At $20 I can afford experimenting.
Hey mate,

Do you have a link where you picked it up or which store you got it from?
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Old 04-22-2018, 10:24 PM   #60
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I didn't post a link as this is a U.S. (mainly) site but I c u r an Aussie too.

Got it from Cheap As Chips. MA2488 Amazing Gel Comfort Cushion 34. They also have a black car cushion HA9255 Cooling Gel Cushion 4 which was the other one I tried but it didn't seem to do much. I cannot find any gel inside that one despite the description... only a rubbery pad with big holes for air circulation.
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Old 04-23-2018, 01:42 AM   #61
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Thanks mate, the wife thanks you!
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Old 10-28-2018, 10:16 AM   #62
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Looking at rear LCAs like the SPL units where there are 3 shock mounting holes am I correct in stating that mounting the shocks in the outermost hole (closest to the hub) will effectively increase the rear spring rate/wheel rate?
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Old 11-11-2018, 01:01 AM   #63
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Looking at rear LCAs like the SPL units where there are 3 shock mounting holes am I correct in stating that mounting the shocks in the outermost hole (closest to the hub) will effectively increase the rear spring rate/wheel rate?

Moving the shock mount towards the hub would increase the motion ratio which would put more spring force (weight) on the spring, but the spring rate (on a linear rated spring) would remain constant throughout. It would only compress the spring further than it would if it were mounted on a shock mount more towards the control arm pivot point.



For my car I've only spec'd out the rear for coil-overs, but with the factory control arms the motion ratio is .76. The way I measured this was:






On the rear of my (2013) FRS D1 is 13.50" and D2 is 17.75". Dividing 13.50" by 17.75= .76


I haven't weighed my car on scales, but all this means is that (say for example) each rear corner weighed 630 lbs. on scales. You would subtract the unsprung weight of wheel/tire/brakes/half of control arm, let's call it 100 lbs., giving you 530 lbs. on that corner. With the motion ratio that 530 lbs. divided by .76 would give you the actual force the spring would see of= 697 lbs.



Typically on a street car you'll want to see 25%-30% of the springs free length compressed by the weight of the car, so changing the mount position inboard or outward on a control arm will effect the compressed spring length. Ultimately, it's the dampening of the shock that controls the motion/ride quality of the car, though.
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Old 11-11-2018, 12:19 PM   #64
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What is the ideal motion ration? Do you want it as close to 1 as possible?
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Old 11-11-2018, 12:44 PM   #65
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There is no "ideal motion ratio". Depending on car body, suspension design, clearance, dimensions, it just happens to be some specific one for that car. And manufacturer chooses spring and damping rates to be used with that ratio, as it changes resulting rates one actually will get "at wheel".
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