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Eibach Pro-Kit Lowering Springs Vs H&R Sport Springs 15 Vs Steeda
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Fatpolish
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What do you mean by unpredictable? Could you please elaborate as to how and why?
dwaleke
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The change from soft to firm can upset the car too much.
With linear springs you compress the spring 1" you get x rate of force. Compress 2" inches and you get 2x rate of force pushing back. This consistency allows you to push the car knowing how it will respond.
With progressive springs the more you compress the spring the rate of force pushing back also increases. It's the increase that makes it difficult to know what the car will do when pushed hard.
In actual track and racing you will never see a car with progressive rate springs.
So what can happen? You can lose control of the car. Spin out, etc. Harder to keep control of the vehicle. It's not impossible, but guys with linear rate springs don't have to deal with these issues.
Google around. I'm probably not explaining it very well. It's not a Mustang thing so you should be able to find a lot of information on this.
With linear springs you compress the spring 1" you get x rate of force. Compress 2" inches and you get 2x rate of force pushing back. This consistency allows you to push the car knowing how it will respond.
With progressive springs the more you compress the spring the rate of force pushing back also increases. It's the increase that makes it difficult to know what the car will do when pushed hard.
In actual track and racing you will never see a car with progressive rate springs.
So what can happen? You can lose control of the car. Spin out, etc. Harder to keep control of the vehicle. It's not impossible, but guys with linear rate springs don't have to deal with these issues.
Google around. I'm probably not explaining it very well. It's not a Mustang thing so you should be able to find a lot of information on this.
GT0038
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I had a set of the new Steeda 555-8210 progressives installed yesterday and love it. I do take my car to the track once in a blue moon and look forward to seeing what it does next week. However this is why I wanted the progressive because I did not want any harsher of a ride than what I had already.
If I were to build my car into a full on race car then yes I would agree with Dwaleke that linear would be the way to go for no compromises and a predictable feeling. But even pushing my car hard through what I like to refer to as turn 5 on my way home from work (the off ramp on the interstate); it was not like my car was uncontrollable it felt more planted than ever with out the body roll I had earlier. And the thing we all need to remember is we will never be pushing our cars as hard or as much on public roads as we could if we were on the race track.
And not to thread jack this thread but if anyone wants to buy the Pro-Kit set I had removed please PM me.
If I were to build my car into a full on race car then yes I would agree with Dwaleke that linear would be the way to go for no compromises and a predictable feeling. But even pushing my car hard through what I like to refer to as turn 5 on my way home from work (the off ramp on the interstate); it was not like my car was uncontrollable it felt more planted than ever with out the body roll I had earlier. And the thing we all need to remember is we will never be pushing our cars as hard or as much on public roads as we could if we were on the race track.
And not to thread jack this thread but if anyone wants to buy the Pro-Kit set I had removed please PM me.
dwaleke
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Try a high speed left/right/left maneuver. That type of driving is where you could get in trouble. Not a single sweeper.
I agree though most will rarely ever be in that situation on the street. And for those that are as long as they know what they could be into they can proactively prepare for it.
It's difficult to trade ride comfort for performance in a street car.
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Todd15Fastback
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Great to hear you like them! Do you have any other suspension upgrades installed or just the springs?
If you added upgrade front and rear sway bars, billet sway bar mounts, vertical links, etc, that would help with the switchbacks you mentioned above, correct?
dwaleke
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Your car will be different than ones without those parts, but it's tough to say whether it would be better or worse.
It's possible those parts could magnify the effect making it even more unpredictable. Or tame them. I really don't know.
I'd be curious if anyone plans on testing these vs linear ones on the track (either autoX or road course racing). Back-to-back testing would get us a lot of information.
Todd15Fastback
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I don't race my car at all, other then a club track day once every couple of years.
I would assume all these parts, regardless of spring type would work in harmony as I trust Steeda
.Guess I will find out:cheers:
dwaleke
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I'm sure they will. I'm not saying Steeda is bad at all. All my suspension parts came from Steeda.I would assume all these parts, regardless of spring type would work in harmony as I trust Steeda
Just discussing progressive vs linear springs in general.
I opted for the Steeda Sport Linear springs. Progressive would provide a better ride with the trade-offs discussed above.
I'm sure you will love your setup.
Todd15Fastback
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Yep. I didn't think you were saying they were bad
.What all Steeda parts do you have installed?
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GT0038
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Currently all I have done are the springs and steeda swaybars. I had the Eibach's on their originally but the ride was just way to harsh, IMO.
dwaleke
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Springs, F&R Sway bars, IRS Bushing Support Kit, and Rear Toe Links.
Once there is another sale I'm going to get the vertical links and IRS alignment kit. Possibly the G-trac brace and IRS braces as well.
I really like what BMR is doing too. And it seems they put a lot of track testing into their parts before releasing them. So I might look to them for some stuff.
I bought Steeda because their stuff was available when I wanted it. Good quality parts.
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Happy to provide additional background info.
Steeda’s progressive lowering springs for the S550 use a dual-rate spring with two linear rates connected by a rate transition range. What does this mean to our customers? In short, it means the springs are more predictable and easier to tune.
Our progressive springs were designed and tuned for a setup consisting of one to two people at 200 lbs each with a full tank of gas in the car. From our experience, a linear spring doesn’t provide as much roll control as a progressive spring. Think of our progressives as a high-tech dual-rate spring.
Spring rates - our progressive springs are 10% stiffer than the PP springs at curb and provide a 40% increase in roll stiffness over the PP springs when you lean into it and the spring compresses.
Steeda’s progressive lowering springs for the S550 use a dual-rate spring with two linear rates connected by a rate transition range. What does this mean to our customers? In short, it means the springs are more predictable and easier to tune.
Our progressive springs were designed and tuned for a setup consisting of one to two people at 200 lbs each with a full tank of gas in the car. From our experience, a linear spring doesn’t provide as much roll control as a progressive spring. Think of our progressives as a high-tech dual-rate spring.
Spring rates - our progressive springs are 10% stiffer than the PP springs at curb and provide a 40% increase in roll stiffness over the PP springs when you lean into it and the spring compresses.
Todd15Fastback
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David - Thanks so much! This is wonderful information:cheers:
DR_
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What I was waiting to hear. I just put my Steeda Progressive order in.
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