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Shelby GT350 Mustang Discussions of the 2015+ Shelby GT350 and GT350R Mustang


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Old 02-10-2017, 12:48 AM   #1
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Question about R springs

I'm looking to upgrade my Gt350 springs to R springs. I found on the general forums a spreadsheet with all the spring rates from stock to aftermaket springs.

They rate GT350 F/R to 194/914 and GT350R to 240/914.

Is there a benefit in going for the rear R springs since the spring rate is the same as the non-R?
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Old 02-10-2017, 12:52 AM   #2
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I think the R springs are a little bit lower regardless spring rate. You don't want lower front springs with higher non-R rear springs. They do have different part numbers for rear springs so there must be a reason for that since they have the same rate.
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Old 02-10-2017, 01:04 AM   #3
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I've read in other threads confusing info about R springs lowering the car or not... Voodooo confirmed it does not lower the car and he knows his stuff. I agree that if different p/n there must be a reason...
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Old 02-10-2017, 01:10 AM   #4
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The R springs are the way to go. Unless you want to lower the car. The R springs will lower the car 0 to 1/4". For how cheap the springs cost, I bought all 4 and powdered coated mine red so I knew for personal reference which springs I had on the car and wouldn't confuse them with the stock Non-R springs.
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Old 02-10-2017, 01:15 AM   #5
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I remember that post since I was wondering the same when I ordering the springs myself. I research a lot of online info and getting the answers from lowering 0, 1/8 and 1/4 inch. So it's not a very noticeable drop if they are lowered at all. Voodoo had both front and rear on his car. I end up got all of them. Rear pair cost about 200 or so if I remember it right. So I think I'd rather spend a little bit more to make myself worry free from lowering issue.
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Old 02-10-2017, 01:35 AM   #6
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I remember that post since I was wondering the same when I ordering the springs myself. I research a lot of online info and getting the answers from lowering 0, 1/8 and 1/4 inch. So it's not a very noticeable drop if they are lowered at all. Voodoo had both front and rear on his car. I end up got all of them. Rear pair cost about 200 or so if I remember it right. So I think I'd rather spend a little bit more to make myself worry free from lowering issue.
You paid $200 for just the rear springs?
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Old 02-10-2017, 01:46 AM   #7
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You paid $200 for just the rear springs?
Looks like I got wrong memory! Just checked again and I spend 250ish for all springs and 60ish for the rear stabilizer bar
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Old 02-10-2017, 06:58 PM   #8
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What about magneride recalibration to match the higher spring rates?
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Old 02-10-2017, 07:08 PM   #9
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What about magneride recalibration to match the higher spring rates?
Not needed.
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Old 02-10-2017, 07:11 PM   #10
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Any other expert opinions?
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Old 02-10-2017, 07:23 PM   #11
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Lol. Ok. I'm not the only one who's swapped to R springs.
But I am one of the first and you do not need to do anything else.
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Old 02-10-2017, 07:34 PM   #12
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Seems a little odd that increasing the front rates that much wouldn't require a recalibration of the magneride dampers. Is your opinion based on experience with your cars performance or validated by someone with understanding of the programming running our dampers?
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Old 02-10-2017, 07:51 PM   #13
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Seems a little odd that increasing the front rates that much wouldn't require a recalibration of the magneride dampers. Is your opinion based on experience with your cars performance or validated by someone with understanding of the programming running our dampers?
Thats ok. Don't take my word. Others have done it also.
DSC, vorshlag, cortex etc.
you asked and I answered your question. Plain and simple. If you want to run R springs you do not need a recalibration. But I'm also going to use a DSC controller to further enhance my cars performance.
If you notice my mods below I also replaced all the bushings with bearings, reduced weight with forgeline wheels, pilot sport cup 2 305/30 tires, replaced all the rubber chassis bushings with solid bushings, Vorshlag camber plates etc.
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Old 02-10-2017, 08:14 PM   #14
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Seems a little odd that increasing the front rates that much wouldn't require a recalibration of the magneride dampers. Is your opinion based on experience with your cars performance or validated by someone with understanding of the programming running our dampers?
The re-calibration is not needed. This is based on (7) track events with the R-springs installed and with a Ford Engineer attending an early event at TWS.
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Old 02-10-2017, 08:32 PM   #15
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The Magneride shocks are the same ones used on the Corvette. Corvettes and Mustangs also use the same DSC controller to tune the damping. All Corvettes use same DSC calibration, regardless of spring. In fact the calibration values for the Shelby are identical to those of the Corvette. Michael Levitas has been daily driving an R for the past two weeks and will be releasing updated software and firmware next week. I mentioned to him that my car is bouncy on certain roads. He told me to be sure the "transport blocks" are out from the springs. Has anyone heard of those?
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