275 vs 300LB front spring
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From: Kannapolis, NC
275 vs 300LB front spring Should have my front end buttoned up this month and was using 300# springs. I would like to try the 275# spring while I am swapping everything over but would like to know the pro's vs con's of the difference in 25#. The car will weigh in the 3200lbs range with battery in rear ect. What effects will a lighter spring have at the track on a 6sp car? Thanks in advance.
I've wanted to know this for awhile myself. I even posted up about it last year but didn't get any responses that made clear sense. I currently have 275# springs and would like to try the 300# springs, so maybe we could trade? lol...
Mike
Mike
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From: Kannapolis, NC
Most of the weight I am getting rid of is unsprung weight so I understand that will not matter to the spring but I would like the car to raise higher of the line. Right now the car comes up and imediately right back down and unloads the tire(shocks I know) but how will the 275's work or what are the advantages/disadvantages?
The lighter the spring you can run the better because you can crank the spring up tighter for more stored energy for launch....make sense ???
I have a set of the 275 lb springs for sale if you want to send a pm.
I have a set of the 275 lb springs for sale if you want to send a pm.
How much weight is over the frt end. We have over 1700lbs and are running the 300lb springs. Mad Man recomended them to us. You have to have enough spring to support and control the weight. Then you have to adjust the compression of the shock to be able to control the weight of the car coming back down. That is if it lifts the tires. I'm sure yours does. If you don't have enough comp the car will bottm out the spring and maybe the oil pan etc. Or bounce up and down.
Moroso made their trick springs that help with that on the launch. I'm not sure how much it helps with our cars because of the coil over set up. If I crank mine to far it affects the ride height.
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All I can talk about is my QA1's with a #310 spring and on a full weight car it seems to be just bearly the minimum before stuff starts rubbing. I use a skinny with a 165mm Metric tire. I also get air dam rub on dips.
I have not been to the track so I really cannot comment there but having the weight xfer is an Ideal situation. IMO I would do some test hits and start dialing it in before spending money/time on something that may not work.
I have not been to the track so I really cannot comment there but having the weight xfer is an Ideal situation. IMO I would do some test hits and start dialing it in before spending money/time on something that may not work.
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I'm with mad steve on this one, I run the lightest one that came with my QA1 coil overs and on my almost 3800# car I had to crank them all the way up and the front end is still really low. If I did it over I would go with a stiffer spring.
i went from 325lb springs cause I read on the internet if you have a full weight car and an iron block use those.... so i ended up trying the 275's, and yes i had to crank up my adjustment on the coil over but i went from this:
1.55 60ft best with the 325lb spring, and not getting full lift out of the front.
1.46 60 ft best with the 275lb spring, and getting full transer and the front stayed up longer.
this is on a high 10 second, 600FWHP 3820lb race weight 6 speed car.
I kept the 275's on mine.
1.55 60ft best with the 325lb spring, and not getting full lift out of the front.
1.46 60 ft best with the 275lb spring, and getting full transer and the front stayed up longer.
this is on a high 10 second, 600FWHP 3820lb race weight 6 speed car.
I kept the 275's on mine.
and I ran the rears at 3(from soft) and I thought the car handled rather well and was pretty stiff!
i know not everything works for everyone, but I just shared my thoughts on the matter. Seems that the 275lb spring holds more stored energy for the launch. if you read spring rates its 275lb per inch, which means to hold the same weight that spring will be shorter than a 300 lbs spring. or that the 275lb spring will be "coiled" up more to hold the car up, but apon movement will have more push throughout the travel of the shock and the car launching.
thats kinda how I look at it.
I'm sorry it just doesn't make sense to me to speak about "stored energy" in the simple spring. I see it this way - upon launch, spring is stretched, and the more it stretches, the more "downforce" it generates. 300lb generates more downforce than 275lb for the same stretch distance, or front-end travel. So to compensate upward force that front-end has on the launch, 275 spring will stretch more, allowing front to lift higher, so weight transfers more.
Don't know why am I writing all this, perhaps trying to explain that to myself =) Someone please correct me if I'm totally wrong
Anyway, you're saying your heavy car with 275lb springs handles not worse than with stock suspension?
Don't know why am I writing all this, perhaps trying to explain that to myself =) Someone please correct me if I'm totally wrong
Anyway, you're saying your heavy car with 275lb springs handles not worse than with stock suspension?
I went with the 275s and "R" type shocks. I am very happy with them, I get good launches outta the 6 speed. I would say I have mid level weight reduction up front - lightweight battery, no HVAC, no cruise or tcs, and no abs. But still have the bumper support, fog lights, ps pump, and a few other odds and ends up there. Haven't scaled the car.
I can tell you that I comfortably run C6 ZO6 rims and tires up front when not at the track, set the shocks to 6 or7 and have no issues with rubbing - I do have the HD rear drag sway bar which does help with corners (lol duel purpose bar!). I'm not taking corners at 2x the speed limit either, but its way different then setting the shocks to 2, running skinnies, and taking a corner
I can tell you that I comfortably run C6 ZO6 rims and tires up front when not at the track, set the shocks to 6 or7 and have no issues with rubbing - I do have the HD rear drag sway bar which does help with corners (lol duel purpose bar!). I'm not taking corners at 2x the speed limit either, but its way different then setting the shocks to 2, running skinnies, and taking a corner