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Issue with Swift Spec R for CBA ??

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6 replies to this topic

#1
droptopp

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I know there used to be a specific Swift lowering spring for the 09/10 (Sport springs) and 11+ (Spec R). Looks like part number has not changed from back in the day - 4N017R.

Swift shows :
Sport Mach Springs for the 2015+ GT-R (Swift Part # 4N912).

Spec-R Spring Set 2011-2014 GT-R (Swift Part # 4N017R)

Sport Mach Spring Set 2009-2010 (Swift Part # 4N017), but they also list Spec-R as universal for 2009-2015

Looking at the spring rates :

Spec R Front : 1117 lb front and 615 lb rear
Swift sport Front: 840 lb and 392 lb rear
OEM Front : 799 lb and 382 rear

I’m having issues with G-Senor and AWD overheats faults since adding the springs and wondering if the spec R could be the issue by not allowing enough squat. Could also be why I was spinning so bad as well.

Anyone with a 09/10 use the Spec R ?

Edited by droptopp, 14 August 2018 - 03:54 PM.

GTX3582R built and tuned by STM, AMS 4.1, Omega billet crank, Alpha Cams, STM DP, MP, 4 STM Titanium custom exhaust, STM Race FMIC 22x18x4.5, full 3" piping, ID 2000, Sheptrans OneK drop gears, DS axles, E85, Advan GT 10/12 285/315 R888 / MT ET 18x10/12 TE37 Saga MT ET SS 275/245.
Heartbreaker Mustang 1186 E70 low boost. Dynojet 1350 +/- 60-130 3.5 seconds. 100-150 3.4 seconds.

#2
shawnhayes

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droptop,

 

What tires are you using?

 

Shawn



#3
droptopp

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MT ET Street 275/345 on Volk Saga 10/12” - roll out measures perfect.
GTX3582R built and tuned by STM, AMS 4.1, Omega billet crank, Alpha Cams, STM DP, MP, 4 STM Titanium custom exhaust, STM Race FMIC 22x18x4.5, full 3" piping, ID 2000, Sheptrans OneK drop gears, DS axles, E85, Advan GT 10/12 285/315 R888 / MT ET 18x10/12 TE37 Saga MT ET SS 275/245.
Heartbreaker Mustang 1186 E70 low boost. Dynojet 1350 +/- 60-130 3.5 seconds. 100-150 3.4 seconds.

#4
shawnhayes

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MT ET Street 275/345 on Volk Saga 10/12” - roll out measures perfect.


I can’t say I have encountered this problem before, but the 345 in the back will change the suspension behavior in the rear of the car a lot.

I have no idea what’s the problem. But awd overheat messages are most common when front and rear tires mismatch but I know you know that.

Shawn

#5
droptopp

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Problem is solved. Swapped tires. I’m amazed they were shot shot between the dyno and the ETS going out - less than 500 miles.

I still think the car rides too rough though. Rear spring rate seems awful high. Going to swap to the 09 specific.
  • elf_cruiser likes this
GTX3582R built and tuned by STM, AMS 4.1, Omega billet crank, Alpha Cams, STM DP, MP, 4 STM Titanium custom exhaust, STM Race FMIC 22x18x4.5, full 3" piping, ID 2000, Sheptrans OneK drop gears, DS axles, E85, Advan GT 10/12 285/315 R888 / MT ET 18x10/12 TE37 Saga MT ET SS 275/245.
Heartbreaker Mustang 1186 E70 low boost. Dynojet 1350 +/- 60-130 3.5 seconds. 100-150 3.4 seconds.

#6
elf_cruiser

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Wait, are you using the SpecR springs for drag racing? That’s probably not a good idea. The whole point of stiffer springs is to minimize weight transfer and allow the car to change direction quickly. If you aren’t going around corners then the stock spring rates are a better option.

Edited by elf_cruiser, 15 August 2018 - 12:37 PM.

  • Tim likes this

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#7
droptopp

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Not drag but definitely street roll. Going to swap to the softer rate.
GTX3582R built and tuned by STM, AMS 4.1, Omega billet crank, Alpha Cams, STM DP, MP, 4 STM Titanium custom exhaust, STM Race FMIC 22x18x4.5, full 3" piping, ID 2000, Sheptrans OneK drop gears, DS axles, E85, Advan GT 10/12 285/315 R888 / MT ET 18x10/12 TE37 Saga MT ET SS 275/245.
Heartbreaker Mustang 1186 E70 low boost. Dynojet 1350 +/- 60-130 3.5 seconds. 100-150 3.4 seconds.




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