what length springs for AST4100?

mike082802 · 04-02-2016, 01:55 PM

so i grabbed a set of AST4100 from the f/s section and the current springs are 392/616 ans i wanted to get some 336lb springs but dont know what length. they are swift springs and if anyone has 336lb and wants to move up let me know i'd be happy to trade.

E82MSport · 04-03-2016, 07:17 PM

Is there a part number on the spring like Z65-178-070?

If you can find a part number check one of these charts.
http://www.swiftsprings.net/products...prings-65.html

titium · 04-04-2016, 01:11 AM

I'd just run the 392 springs sounds like to much hassle for a pretty small difference.

otherwise you could always calculate the length you need based off the length of the springs you have, the difference in spring rate and the weight of the car.

chris82 · 04-08-2016, 02:54 PM

336 sounds like a low rate for an ast4100

mike082802 · 04-08-2016, 03:32 PM

im sticking with the 392 for now, if they're too rough i'll swap. i have to wait 2 weeks for the front struts to get rebuilt anyway.

04-02-2016, 01:55 PM	#1
mike082802 Major 114 Rep 1,004 Posts Drives: 2010 135 Join Date: Feb 2014 Location: ny iTrader: (2)	what length springs for AST4100? so i grabbed a set of AST4100 from the f/s section and the current springs are 392/616 ans i wanted to get some 336lb springs but dont know what length. they are swift springs and if anyone has 336lb and wants to move up let me know i'd be happy to trade.
	Appreciate 0 Tweet Quote

04-03-2016, 07:17 PM	#2
E82MSport First Lieutenant 130 Rep 351 Posts Drives: 08' Crimson 135i Join Date: Sep 2013 Location: Rochester Hills - MI iTrader: (0)	Is there a part number on the spring like Z65-178-070? If you can find a part number check one of these charts. http://www.swiftsprings.net/products...prings-65.html __________________ Ohlins Road & Track Coilovers / Apex ARC 8's 245/255-35 MPSS / Wagner Downpipes / Wagner EVOII Intercooler / ER Charge Pipe / Forge DV / PowerFlex RSFB / PowerFlex Differential Bushings / MFactory 3.46 Torsion LSD / MHD Flasher Last edited by E82MSport; 04-03-2016 at 07:23 PM..
	Appreciate 0 Quote

04-04-2016, 01:11 AM	#3
titium Major 327 Rep 960 Posts Drives: 2009 BMW 135i Join Date: Jun 2015 Location: Sydney iTrader: (0)	I'd just run the 392 springs sounds like to much hassle for a pretty small difference. otherwise you could always calculate the length you need based off the length of the springs you have, the difference in spring rate and the weight of the car.
	Appreciate 0 Quote

04-08-2016, 02:54 PM	#4
chris82 Brigadier General 827 Rep 3,856 Posts Drives: 128i Join Date: Aug 2012 Location: NY NY iTrader: (8) Garage List 2009 BMW 128i [9.80]	336 sounds like a low rate for an ast4100
	Appreciate 0 Quote

04-08-2016, 03:32 PM	#5
mike082802 Major 114 Rep 1,004 Posts Drives: 2010 135 Join Date: Feb 2014 Location: ny iTrader: (2)	im sticking with the 392 for now, if they're too rough i'll swap. i have to wait 2 weeks for the front struts to get rebuilt anyway.
	Appreciate 0 Quote