spring rates
#26
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bumping this
what are the solutions to getting off-the-shelf, plug and play 250lb/175lb springs over some tokico shocks/struts?
I've done a day and a half of search and there are a lot of home-brewed solutions, but I cant find a solid answer.
If custom is the route, what do we have to request?
Inner diameter
Spring length
Spring rate
(??)icecream cone front spring shape?(??)
what are the solutions to getting off-the-shelf, plug and play 250lb/175lb springs over some tokico shocks/struts?
I've done a day and a half of search and there are a lot of home-brewed solutions, but I cant find a solid answer.
If custom is the route, what do we have to request?
Inner diameter
Spring length
Spring rate
(??)icecream cone front spring shape?(??)
#29
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I think the spec7 front rate is around 225. The rear is probably around 125lb. The 175 rear is closer to the pro7 rate, but they are typically paired with 350-375lb. I think you will be somewhat unbalanced with the rates you are looking for.
You seem to know what you want though. For 175 get the ground control pro7 rear springs or go to blue coil (Suspension Spring Specialist, Inc.) and get 8" long springs in the rate you want. At blue coil they come in 25-50 lb increments from 100-500 lb. For the front I don't think you have any choice but to convert to coilovers and get 2-1/2" springs. That is a pretty clean conversion, not particularly home-brew.
Carl
You seem to know what you want though. For 175 get the ground control pro7 rear springs or go to blue coil (Suspension Spring Specialist, Inc.) and get 8" long springs in the rate you want. At blue coil they come in 25-50 lb increments from 100-500 lb. For the front I don't think you have any choice but to convert to coilovers and get 2-1/2" springs. That is a pretty clean conversion, not particularly home-brew.
Carl
#30
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I was afraid of that (the ground control kit)
Do you know if 5x8" would be drop in? Or would it be too low with the stock length being closer to 12-13inch? Did a bit of searching on that as well and it seemed people were getting taller spring perches to fit the 5x8"
Do you know if 5x8" would be drop in? Or would it be too low with the stock length being closer to 12-13inch? Did a bit of searching on that as well and it seemed people were getting taller spring perches to fit the 5x8"
#32
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I think it will still work ok. I am going to try 300 lbs in the rear but I am building a v8 powered drift car...so probably the opposite of what you guys are trying to achieve handling wise
#33
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ah yes. one thing to look out for when putting it low is there's a lot of wheel hop due to the watts link. AE86 guys have a kit that makes the arms equal length and help solve that binding, but i'm unaware of one for the FB.
#34
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5x8 is low, but it works fine in my ITA car. You can add spacers though if you want it higher. You can also buy a lower rate 13" long spring and cut it to the length you want. Just look up a spring calculator online to figure out what spring rate to get so that you can cut it to the length you want and end up with the spring rate you want. Pretty straight forward. Then again the Ground Control pro7 rear spring rate is 175lb, I think, and it has a bunch of dead coil that you can cut to give you the length you want.
#36
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Ah maybe I'll order the 9" just like the pro7 cars, and the 300lb fronts in that weld on coilovers kit by gc. Do you need camber plates there or will the metal hats sit in the spring seat fine on top?
Thanks for all this help! I'm finding FBs require quite a bit of research lol
Thanks for all this help! I'm finding FBs require quite a bit of research lol
#37
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No you will need to do something at the top. What I have done on our ChumpCars (just made 2 last week) is to cut up the stock upper spring perch to use the "bearing washer" at the top. That is welded to a 1-3/4" washer and then on the opposite side is welded a short piece of 2.25" tubing to keep the spring centered. That has worked for many hours of racing and multiple crashes (by my teammates, not by me). The attached picture shows two. One is upside down so you can see what they look like. They bolt into place just like the stock upper perch and use the rubber in the stock top hat for flexibility.
#38
Rear Coil Over Rates
Hoping that someone from this thread is still up for talking about this. I'm running 375# on the fronts with Tokicos and coil overs. I have 290# in the back with 5X8 coils. I want to go to the TTT rear coil over (+weight reduction, +ride height adjustablilty) but I'm having a tough time understanding how to apply to the motion ratio to calculate the rate when switching from standard coils to coil overs. I see that Beansncornbread mentioned the coil over question but I couldn't find a response that mentioned suggested rates.
So...anyone running rear FB coil overs and, if so, what rate are you using?
My car (Trixie) is 1950# without me in the seat, running Avon 15"x10.5"x23" slicks.
Thanks in advance!
So...anyone running rear FB coil overs and, if so, what rate are you using?
My car (Trixie) is 1950# without me in the seat, running Avon 15"x10.5"x23" slicks.
Thanks in advance!
#39
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I am planing on getting ttt coilovers sometime soon and I was thinking 325 front and 175 rear but I was wondering if it would be good for a summer daily that I might be sliding around in once in a while
#41
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Ok thanks and I was also wondering how to rear is because I see a lot of people saying the rear strut towers aren't strong enough to hold the weight of the car and they will get messed up but I have never seen anyone post pictures of ones that broke through on a fb Rx7
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