H&R springs 390-340,350-390

[whtnotch]

Just as the title says I changing out the rear suspension and would like to know the differences on the H&R 390-340,and the 350-390 rear springs.And opinions and people that used them.I found the springs on MM.

thanks

 

[whtnotch]

bump,springs are on maximum motorsports i really need to know more information on these springs and can't find anything online

thanks

 

[TENGRAM]

not really clear what you're trying to figure out. they are both for torque arm setups...do you have a torque arm? the 390-430 are progressive springs and are stiffer than the 350-390 which are also progressive.

 

[5spd GT]

He is wanting to know how they ride? What springs they would match do best? What pros/cons may a stiffer spring have, etc?

You could call MM's tech line, they are very good at answering questions

 

[whtnotch]

im looking for a more of a drag spring,but car will see alot of the street as well.are the torque arms the mm lower controls?or what.I will look more into it later.progressive rate are what more aggressive?and stiff?I read a small part on progressive and the other one don't remember right off hand just getting into the suspension part right now.Did anyone use these springs?or can you show me to a better set of just rears i don't need the set of 4.ride don't matter much car drives hard as it is what i do can only make better.

thanks for all the help

 

[whtnotch]

oh man your right i just did a quick look and i see what u mean by torque arms.are there any drag springs for just the back somthing that won't lower car as well.car can't go any lower i got 17"s with 275/40/17s with a 3" catback anylower and i will have some binding tire 2 wheel.

thanks

 

[mike93lx]

i don't think my eibach drag kit really dropped the car much. take a look at those

 

[TENGRAM]

oh man your right i just did a quick look and i see what u mean by torque arms.are there any drag springs for just the back somthing that won't lower car as well.car can't go any lower i got 17"s with 275/40/17s with a 3" catback anylower and i will have some binding tire 2 wheel.

thanks

the stock springs are actually pretty decent for launching. you might want to look into some drag shocks, ie lakewood

BTW, progressive springs have a variable spring rate. as the spring compresses it gets progressively stiffer. in contrast, specific rate springs have the same spring rate throughout the compression

 

[whtnotch]

yes i just bought some lakewoods and got the mm control arms with upper and lower battle boxes.i read a little on B and C springs i didn't understand to much about that.i need to find the springs for just rear.I looked into eibach but I only seemed to find full sets of 4.Front suspension is already done wit moroso launch springs and lakewoods as well.So you can't use those H&R's without the torque arms?will it bind up my rear end?break?
damn...gettin nice out need car

 

[whtnotch]

last bump.anyone have any suggestions on some rear launch springs?