GT350R Springs for GT (high rate, minimum lowering)

[Rebellion]

SP085 rear for the Koni's, just like [MENTION=26233]Rebellion[/MENTION] has (he has the FRPP Track dampers, though). I wouldn't use the 082's with Koni's as it'll likely be too much for that spring at anything but the softest setting, and too firm on compression as well. I do think it'll be a bit harsh for a DD. FRPP Track or Steeda's adjustables would probably be better, even paired with the firmer springs, but I guess try with the Koni and see what you think. This stuff is very subjective.

Yeah, I think the koni's will mesh well with the 85's, they might even be a wee bit underdampened (me thinks). I've read that [MENTION=10530]MustangCollector[/MENTION] tried it and stated that they are very good for track but a bit too stiff for DD (he liked more the FRPP tracks with 85's for DD).

The koni's I think would feel harsh regardless because of their asymmetric response that leads to a non-linear feeling, which is good for track since it recovers quicker...the most one can do is to put it with lots of spring rate to try and match it.

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[BmacIL]

Yeah, I think the koni's will mesh well with the 85's, they might even be a wee bit underdampened (me thinks). I've read that [MENTION=10530]MustangCollector[/MENTION] tried it and stated that they are very good for track but a bit too stiff for DD (he liked more the FRPP tracks with 85's for DD).

The koni's I think would feel harsh regardless because of their asymmetric response that leads to a non-linear feeling, which is good for track since it recovers quicker...the most one can do it put it lots of spring rate to try and match it.

Yup.

 

[2015Etrac]

Yeah, I think the koni's will mesh well with the 85's, they might even be a wee bit underdampened (me thinks). I've read that [MENTION=10530]MustangCollector[/MENTION] tried it and stated that they are very good for track but a bit too stiff for DD (he liked more the FRPP tracks with 85's for DD).

The koni's I think would feel harsh regardless because of their asymmetric response that leads to a non-linear feeling, which is good for track since it recovers quicker...the most one can do is to put it with lots of spring rate to try and match it.

Would the 082's I have be a really bad choice with the 350r fronts and Koni's? I'd like to use them since I already have them, but if they will make the car handle badly I'll have to buy some 085's. I believe the 082's I have are 740lb/in, then there are the 088's from the drag pack which are 800lb/in. Since it's my daily driver I don't want anything too harsh.

 

[BmacIL]

Would the 082's I have be a really bad choice with the 350r fronts and Koni's? I'd like to use them since I already have them, but if they will make the car handle badly I'll have to buy some 085's. I believe the 082's I have are 740lb/in, then there are the 088's from the drag pack which are 800lb/in. Since it's my daily driver I don't want anything too harsh.

I think you'll want in the neighborhood of 900+ with the Koni's. The PP rear shocks can handle the 800 lb/in drag springs well, per Kelly, so knowing that the Koni's are quite a bit firmer on compression, and adjustable to go pretty high on rebound if you want, I think it'll be a bit overdamped. You might be able to do an exchange, perhaps?

 

[2015Etrac]

I think you'll want in the neighborhood of 900+ with the Koni's. The PP rear shocks can handle the 800 lb/in drag springs well, per Kelly, so knowing that the Koni's are quite a bit firmer on compression, and adjustable to go pretty high on rebound if you want, I think it'll be a bit overdamped. You might be able to do an exchange, perhaps?

Thanks. Yeah I'll probably sell the 082/089 combo and go with the gt350r front and BMR rear springs, or maybe keep hold onto them to make sure the GT350r and koni's aren't too hard for a DD. I actually have the 350r springs on the way, I just need to get the rear BMR springs.

What makes the rear drag springs different than the rear handing or performance springs? Other than spring rate obviously. Would they handle track course well when matched with the right (firmer) front spring? I have a feeling the main difference with the drag spring package is the combination of the soft front springs with the firmer rear springs? I would assume the rear drag spring would actually handle a road course better than the performance pack rear springs because of the higher spring rate?

Picking the right street/track performance spring/damper combo is so hard for us guys who want a minimal drop.

 

[BmacIL]

Thanks. Yeah I'll probably sell the 082/089 combo and go with the gt350r front and BMR rear springs, or maybe keep hold onto them to make sure the GT350r and koni's aren't too hard for a DD. I actually have the 350r springs on the way, I just need to get the rear BMR springs.

What makes the rear drag springs different than the rear handing or performance springs? Other than spring rate obviously. Would they handle track course well when matched with the right (firmer) front spring? I have a feeling the main difference with the drag spring package is the combination of the soft front springs with the firmer rear springs? I would assume the rear drag spring would actually handle a road course better than the performance pack rear springs because of the higher spring rate?

Picking the right street/track performance spring/damper combo is so hard for us guys who want a minimal drop.

AFAIK, it's just the rate. 3 offerings for different packages. The 350R and SP085 combo isn't too harsh for springs, per Rebellion's experience thus far. If it feels harsh, it's the Koni's firm compression. You're not going to significantly lessen that by going softer on springs. Going to an underdamped setup will just make the car feel poorly controlled and crashy.

 

[2015Etrac]

AFAIK, it's just the rate. 3 offerings for different packages. The 350R and SP085 combo isn't too harsh for springs, per Rebellion's experience thus far. If it feels harsh, it's the Koni's firm compression. You're not going to significantly lessen that by going softer on springs. Going to an underdamped setup will just make the car feel poorly controlled and crashy.

Thanks. I guess I could always run 2 rear left gt350r springs since apparently the rear left springs on the gt350r will work on a GT.

 

[BmacIL]

Thanks. I guess I could always run 2 rear left gt350r springs since apparently the rear left springs on the gt350r will work on a GT.

You could, but there's no reason not to run SP085s instead. I believe the GT350R rear springs are actually more expensive.

 

[2015Etrac]

You could, but there's no reason not to run SP085s instead. I believe the GT350R rear springs are actually more expensive.

Thank's. I'll probably order the 085's today then.

 

[Rebellion]

Hey [MENTION=25684]2015Etrac[/MENTION], honestly I got convinced of the 85's after reading this post: http://www.mustang6g.com/forums/showpost.php?p=1524203&postcount=366

Particularly, this part:

Now on to the BMR Handling Springs, we did a quick test on another car with the OEM PP shocks as we were waiting for the Ford Racing Track shocks to arrive. With the OEM PP shocks the car feels good but the ride quality can be a bit jarring at times and I think this is mainly from the lack of rebound on the rear shocks. We only had this in his car for a few days and then switched to the Ford Racing Track Shocks.
With the BMR Handling springs and Ford Racing Track shocks the car felt almost identical to my car when I had the Steeda Ultralights and Ford Racing shocks. I do think the car launched better and more consistent with the BMR Handling springs because of the better ride height stance, as the BMR sits a touch taller and more balanced it reduced rear camber and the car just feels really damn good. I have found that any negative rear camber more than -1.6 per side really makes the IRS react funky.

After my friend drove the BMR Handling Springs and Ford Track shocks for about 1000 miles he simply felt the shock valving could be better so he bought the Koni Yellow. We installed them a few weeks ago and it for sure feels like a much better match to the BMR Handling Spring rate. In my honest opinion I feel this set up is not good for the street or for anyone who drives on bad roads and potholes, its just to damn tight and rough and I could never drive this daily. My friend only uses his car on the weekends and for pleasure so for his needs it suits him just fine. I never liked Koni yellow on any car I have tested or owned from BMW M3, Porsche etc so this is my opinion that their valving for where I drive is just too aggressive and best left for the track or autocross guys. In NY the Koni hurt your back after 45 min of driving around here.

The thing with koni's is, I've heard people praise how they handle but haven't heard of anyone saying that they are comfortable. I don't think you can go wrong with the 85's. I do however, admit that I wanted a softer rate, somewhere 900-950lbs, but there's nothing on the market like that. The drags are 800lbs (I think) and most likely will be overdampened by the track or koni shocks. The 82/89's will definitely be overdampened with either shocks.

If you're going forward with the koni's, I'd say that you'll need at least 900lbs on the rear rate. The front doesn't seem to really affect comfort. Like stated in the post above, the koni's will basically "clamp" you down, if that's the feeling you want. I got a small feel for that for the first few hours before my FR track dampers broke in, I'm sure I can live with it but definitely not family friendly.

 

[2015Etrac]

Hey [MENTION=25684]2015Etrac[/MENTION], honestly I got convinced of the 85's after reading this post: http://www.mustang6g.com/forums/showpost.php?p=1524203&postcount=366

Particularly, this part:


The thing with koni's is, I've heard people praise how they handle but haven't heard of anyone saying that they are comfortable. I don't think you can go wrong with the 85's. I do however, admit that I wanted a softer rate, somewhere 900-950lbs, but there's nothing on the market like that. The drags are 800lbs (I think) and most likely will be overdampened by the track or koni shocks. The 82/89's will definitely be overdampened with either shocks.

If you're going forward with the koni's, I'd say that you'll need at least 900lbs on the rear rate. The front doesn't seem to really affect comfort. Like stated in the post above, the koni's will basically "clamp" you down, if that's the feeling you want. I got a small feel for that for the first few hours before my FR track dampers broke in, I'm sure I can live with it but definitely not family friendly.

Thanks for the tips. I think I might give the GT350r rear springs a try, I was looking into them and they have a 914lb rate, and should pair well with the 350r fronts, in handling and ride height. I believe I have to get 2 left springs, the rear rights don't work from what I read. I'm not sure if I need anything else or if I can just throw them right on with the Koni's. I already have the Koni shocks in the garage so I'll probably give them a try and see how they handle.

 

[Norm Peterson]

Hey @2015Etrac , honestly I got convinced of the 85's after reading this post: http://www.mustang6g.com/forums/showpost.php?p=1524203&postcount=366

Particularly, this part:


The thing with koni's is, I've heard people praise how they handle but haven't heard of anyone saying that they are comfortable. I don't think you can go wrong with the 85's. I do however, admit that I wanted a softer rate, somewhere 900-950lbs, but there's nothing on the market like that. The drags are 800lbs (I think) and most likely will be overdampened by the track or koni shocks. The 82/89's will definitely be overdampened with either shocks.

If you're going forward with the koni's, I'd say that you'll need at least 900lbs on the rear rate. The front doesn't seem to really affect comfort. Like stated in the post above, the koni's will basically "clamp" you down, if that's the feeling you want. I got a small feel for that for the first few hours before my FR track dampers broke in, I'm sure I can live with it but definitely not family friendly.

You should be able to find at least a reasonable compromise point. The end result might allow a little more body motion than you perhaps prefer, and it might be a little firmer than people who are more sensitive to such things would like - but that's the nature of "compromise". I do have to wonder why anybody who'd complain about the damping necessary to control firmer spring rates would be all that interested in stiffening up the springs in the first place.

For a solution to suit fussier tastes, you'd probably have to step up to double-adjustable dampers.


Norm

 

[2015Etrac]

You should be able to find at least a reasonable compromise point. The end result might allow a little more body motion than you perhaps prefer, and it might be a little firmer than people who are more sensitive to such things would like - but that's the nature of "compromise". I do have to wonder why anybody who'd complain about the damping necessary to control firmer spring rates would be all that interested in stiffening up the springs in the first place.

For a solution to suit fussier tastes, you'd probably have to step up to double-adjustable dampers.


Norm

I actually just re-read this entire thread and it appears no one has used the GT350r rear springs yet? Now I'm concerned about them working. Apparently it's just a theory that 2 rear left 350r springs will work.

 

[Rebellion]

You should be able to find at least a reasonable compromise point. The end result might allow a little more body motion than you perhaps prefer, and it might be a little firmer than people who are more sensitive to such things would like - but that's the nature of "compromise". I do have to wonder why anybody who'd complain about the damping necessary to control firmer spring rates would be all that interested in stiffening up the springs in the first place.

For a solution to suit fussier tastes, you'd probably have to step up to double-adjustable dampers.


Norm

Yeah, it is a matter of compromise and acknowledging that some solutions are not the optimal for some needs. In this case, we wanted something with a low drop, high rates and appropriate dampers that won't "harshen" the ride any more than necessary.

IMO, I happen to be particularly wary of the koni's because they're single adjustable and their rebound/compression rates are asymmetric. These are not necessarily bad things, but for a daily driver, I believe it's not the best solution.

 

[Rebellion]

I actually just re-read this entire thread and it appears no one has used the GT350r rear springs yet? Now I'm concerned about them working. Apparently it's just a theory that 2 rear left 350r springs will work.

I was going to be the first adopter...then I retracted and went safe with BMR. The issue is that there is some confusion with the upper/lower spring seat (or anti-squeak, as Ford calls them) fitment and PN.

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