Spring rates????

[apex15stangPP]

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[bluestang50]

I'm 400 front and 450 rear with JRi (Cortex) shocks and BMR bars. To be honest I'm a noob at this so couldn't tell if I need more spring or not. Car handles great for me at the moment.

How do you like the upper mount for the rear coilover? Does it seem much stronger than the factory mount for the shock? I have been a Cortex fan since my 2012, but I am considering the ridetechs due to their revised upper mount. I would like to go the JRI cortex coilovers, but the rear mount has me nervous.

 

[DivineStrike]

My considerations are ridetech and JRZ. If ridetech offered a middle ground dual adjustable co, I'd have them in my garage right now. I just have a hard time spending 5k on suspension. I don't really want single adjustables as I want compression as well to make street driving on stiffer springs that much more comfortable. I could easily justify spending in the 3k range for co's...at the 5k range it makes the decision harder due to other really good options at that price range.

 

[apex15stangPP]

My considerations are ridetech and JRZ. If ridetech offered a middle ground dual adjustable co, I'd have them in my garage right now. I just have a hard time spending 5k on suspension. I don't really want single adjustables as I want compression as well to make street driving on stiffer springs that much more comfortable. I could easily justify spending in the 3k range for co's...at the 5k range it makes the decision harder due to other really good options at that price range.

There are very good reasons we don't have a double adjustable coilover with a Monotube shock you really only need to control rebound. And then throw in a double dgressive piston. The front s550 coilover has enough compression to handle anything you through at it. The rebound adjustments will allow you to dail in ride control.

 

[gtorpedo]

I'm thinking about going stiffer on my Ridetech Level 2's. I have 350f/400r springs and with my BMR bars set to medium stiffness in the front and full soft in rear, I feel the car is VERY well balanced on the road course.

I'd like to maintain the balance, but benefit from a stiffer spring. There is a ton of compression/squat in the rear coming out of corners and putting the power down. I can't go too crazy as I also drive the car on the street (not quite DD).

Initial thought was to bump up to something like 400F/450R or 400F/500R

[MENTION=14941]apex15stangPP[/MENTION] any thoughts?

 

[DivineStrike]

There are very good reasons we don't have a double adjustable coilover with a Monotube shock you really only need to control rebound. And then throw in a double dgressive piston. The front s550 coilover has enough compression to handle anything you through at it. The rebound adjustments will allow you to dail in ride control.

I'm sure they have enough compression for performance driving, and I'm not all that familiar with suspension adjustability, but common sense tells me more compression adjustability will provide the ability to provide a more comfortable ride depending on what conditions you are driving in. I know on motorcycles, compression adjustability matters a lot towards how comfortable the ride is. So in order to get that compression adjustment on ridetechs you have to almost double your investment. That's a big pill to swallow for a consumer

 

[apex15stangPP]

I'm thinking about going stiffer on my Ridetech Level 2's. I have 350f/400r springs and with my BMR bars set to medium stiffness in the front and full soft in rear, I feel the car is VERY well balanced on the road course.

I'd like to maintain the balance, but benefit from a stiffer spring. There is a ton of compression/squat in the rear coming out of corners and putting the power down. I can't go too crazy as I also drive the car on the street (not quite DD).

Initial thought was to bump up to something like 400F/450R or 400F/500R

[MENTION=14941]apex15stangPP[/MENTION] any thoughts?

Good looking ride!!!! Going up 50lbs wouldn't hurt anything. Like most mods there is a give somewhere. I had 425/600 on the car for a a few months and it wasn't bad. But my cars lives 90% of its life at an autox or road course. For best results and track times I'd go 400/500

 

[BMR Tech]

I am considering the ridetechs due to their revised upper mount. I would like to go the JRI cortex coilovers, but the rear mount has me nervous.

Bingo, I think Ridetech hit a grand slam with their upper mount.

Curious, where is your front and rear camber at?

 

[gtorpedo]

Good looking ride!!!! Going up 50lbs wouldn't hurt anything. Like most mods there is a give somewhere. I had 425/600 on the car for a a few months and it wasn't bad. But my cars lives 90% of its life at an autox or road course. For best results and track times I'd go 400/500

Thanks! 400/500 seems reasonable, I'll give that a shot.

 

[gtorpedo]

Curious, where is your front and rear camber at?

Camber is 2.2F 1.5R

 

[Plimmer]

How do you like the upper mount for the rear coilover? Does it seem much stronger than the factory mount for the shock? I have been a Cortex fan since my 2012, but I am considering the ridetechs due to their revised upper mount. I would like to go the JRI cortex coilovers, but the rear mount has me nervous.

Just read this now. It seems to be strong enough, I regularly bounced the bump stops at bumpy harris hill raceway and they look fine.

 

[ddozier]

I'm thinking about going stiffer on my Ridetech Level 2's. I have 350f/400r springs and with my BMR bars set to medium stiffness in the front and full soft in rear, I feel the car is VERY well balanced on the road course.

I'd like to maintain the balance, but benefit from a stiffer spring. There is a ton of compression/squat in the rear coming out of corners and putting the power down. I can't go too crazy as I also drive the car on the street (not quite DD).

Initial thought was to bump up to something like 400F/450R or 400F/500R

[MENTION=14941]apex15stangPP[/MENTION] any thoughts?

I have the Ridetechs in my track only setup and I run the 425f/600r. The car is very balanced there with a slight tendency to over-steer. Once I started adding the aero (3" front splitter and 350r rear wing) the car has become very balanced with a slight tendency to under-steer (I can cure this with more front tire). The car will need more spring if I get to the ride height I want to help manage roll and take full advantage of the improved aero. The issue I am working through is as I increase spring rates to make the aero more efficient I am having a hard time getting down to the ride height I need to run to keep the front end working. I am going to try 600f/700r with tender springs so I can get the ride height lower, or I may try to run 6" spring heights with the stiffer spring rate and see what works. Good thing springs are inexpensive.

On a side note, since the lower front mount for the strut clamps around the shock body is it possible to lower the entire front end by adjusting the lower clamp or would that mess up the geometry too much. May cause issues with tire to strut clearance as that would lower the bottom spring perch.

YMMV as you still need some street use from your setup but the 425/600 spring rates were not horrible to drive on the street and the shock was able to control those rates well.

Dave

 

[Scott Wilson]

I have tried damn near everything. I figured why not since springs are fairly cheap and you can experiment to find the right flavor.

I ended up going with the BMR Handling springs and they out perform the Steeda Linears, Eibach Pros, and the Sportlines. I have used all three of those. Dont get fooled by the sportlines rates as they acct for bump stop deflection. The steedas were good but not stiff enough up front. The Eibach pros had the same issues as the sportlines, which is they are very loose until you load up in a corner.

BMR handling is really good all around and definately still streetable. My only complaint is they will bounce just a tad when getting on/off braking

 

[qtrracer]

So BBSS seems to be the strategy for these cars. I see why the adjustables would help keep the nose down on roll-through. I'm trying to stay in FS so spring changes are not in the cards, nor a true rear C/O. We can swap bars on one end; seems the correct place would be the front - perhaps a 3-way. What are the stock bar rates on the GTpp?

 

[ddozier]

What are the stock bar rates on the GTpp?

This is the data I have on Bar Rates, it is all collected from vendor sources not from my own testing so use it as a guide not gospel.

Sway Bar Rates
Hole 1 Hole 2 Hole 3
Stock PP Front 633
Stock PP Rear 217
BMR 35mm H Front 819 938 1084
BMR 25 mm H Rear 325 455 613
Whiteline Front 899 1006 1108

Dave

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