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 Post subject: dsm vs csm spring rates
PostPosted: Fri Aug 15, 2014 4:14 am 
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Location: Atlanta, Georgia
I am working on an 4g63 open wheel car right now.

Im looking for some specs on spring rates. How would front springs on a 1g fwd dsm compare to the front springs on a csm.

I basically going through my options of stock fitment parts first before going cu$tom. The car will be 50% of the weight of a normal dsm, so the factory springs will be too stiff. Are CSM spring weaker?

Other options?
coilover options?

_________________
Current project - 4G63 street legal rail.


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PostPosted: Fri Aug 15, 2014 9:28 am 
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2nd Banana
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Location: San Diego, CA.
CSM springs are definitely weaker, but I have no idea what the stock spring rates are for either CSM or DSM's. I doubt anyone knows for sure.

_________________
91 GSX - 511fwhp and 352 lb/ft 25psi 110 octane, 7.68 @ 95.9mph 1/8th 21psi 91 octane, 11.93 @ 112.9mph, 117.7mph best trap speed, 20psi 91 octane
98 Volvo S70 T5 - DD

http://www.facebook.com/captaintonus


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PostPosted: Fri Aug 15, 2014 11:26 am 
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Some call me a god

Joined: Wed Oct 04, 2006 3:03 pm
Posts: 1134
Location: Calgary, AB, Canada
Search the gvr4 forum. The dsm/galant spring info is posted there.

Edit: Found it, its hard to read and the format isn't great. Link

On my sedan, I'm running the Galant AWD rear spring, (15.2" Len-112 lb/in). It's sits too high up with the extended top hats I made. I may try to get the DSM 1.8 (13.24"-112lb/in) or Galant SOHC (13.76"-117.6 lb/in). These should bring it down with a similar spring rate. (I don't want to cut the spring, they are in nice shape and getting hard to come by these days).
Quote:
Model Front Spring Length (in) Front Spring Rate (lb/in) Rear Spring Length (in) Rear Spring Rate (lb/in)
1g FWD 1.8 12.9 (M/T)

13.2 (A/T)
123 13.25 112
1g FWD 2.0 12.4 (M/T)

12.7 (A/T)
134 12.46 128.8
1g FWD 2.0T 12.7 (M/T)

12.9 (A/T)
134 12.46 128.8
1g AWD 12.9 (M/T)

13.1 (A/T)
146 13.1 140
Galant FWD SOHC 14.1 (M/T)

14.4 (A/T)
112 13.48 (High Line, 1989)

13.76 (High Line, 1990+)

13.76 (Premium, 1989)

14.04 (Premium, 1990+)
117.6
Galant FWD DOHC 14.8 (M/T)

14.8 (M/T)
112 14.04 117.6
Galant AWD 2.0 13.9 (M/T)

14.2 (A/T)
134 15.3 112
Galant AWD 2.0T 14.2 134 15.3 112

_________________
05 wrx wagon
99 Benz ML 320
91 eagle summit swapped - 6/4 bolt combo
94 Audi s4 - sold
88 Eagle Vista Turbo LX sedan, RIP


Last edited by j2dapo on Sat Aug 16, 2014 11:21 am, edited 4 times in total.

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PostPosted: Fri Aug 15, 2014 4:37 pm 
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The Silent Administrator
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Location: Ottawa, ON, Canada
Tuners thread:

http://www.dsmtuners.com/threads/spring-rates.213963/

That covered DSM values in OEM and some aftermarket.

Still need GVR4.


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PostPosted: Fri Aug 15, 2014 4:38 pm 
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The Silent Administrator
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Location: Ottawa, ON, Canada
Got it:

http://www.galantvr4.org/docs/suspension.asp


From lilevo.com/mirage/ 89 turbo manual

Front Colt/Mirage
89 1.5l 90 lbs.in
89 1.6NA + TC 106 lbs.in

Rear Colt/Mirage
89 1.5 92 lbs.in
89 1.6L 104 lbs.in


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PostPosted: Fri Aug 15, 2014 5:26 pm 
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2nd Banana
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Posts: 9369
Location: San Diego, CA.
Damn, that's a lot of information that I straight-up do not understand! :lol:

_________________
91 GSX - 511fwhp and 352 lb/ft 25psi 110 octane, 7.68 @ 95.9mph 1/8th 21psi 91 octane, 11.93 @ 112.9mph, 117.7mph best trap speed, 20psi 91 octane
98 Volvo S70 T5 - DD

http://www.facebook.com/captaintonus


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PostPosted: Sat Aug 16, 2014 11:24 am 
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Some call me a god

Joined: Wed Oct 04, 2006 3:03 pm
Posts: 1134
Location: Calgary, AB, Canada
Are the lengths listed too?
Quote:
Got it:

http://www.galantvr4.org/docs/suspension.asp


From lilevo.com/mirage/ 89 turbo manual

Front Colt/Mirage
89 1.5l 90 lbs.in
89 1.6NA + TC 106 lbs.in

Rear Colt/Mirage
89 1.5 92 lbs.in
89 1.6L 104 lbs.in
my sedan has the stock front struts and springs. I like the ride height. The back is all DSM/GVR4. Its pretty stiff (104 vs 112 lb/in). Image putting on the AWD DSM rear springs on a colt; (104 vs 140 lb/in) that's 40% stiffer... :yawinkle:

_________________
05 wrx wagon
99 Benz ML 320
91 eagle summit swapped - 6/4 bolt combo
94 Audi s4 - sold
88 Eagle Vista Turbo LX sedan, RIP


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PostPosted: Sat Aug 16, 2014 2:14 pm 
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The Silent Administrator
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Joined: Wed Dec 24, 2003 3:32 pm
Posts: 9524
Location: Ottawa, ON, Canada
Now you need a shock that is valved to handle 40% more spring, and last any great length of time; measured in rebounds/jounces.

Coil-overs with proper valving, will allow for height compensation, get a vehicle dialed in for the type of driving it is supposed to see.

I'm reading through a bunch of early posts here on the board, and it seems most guys don't wan to lower the car more than 40mm or so, because the geometry of the front suspension changes considerably otherwise.

I regret being almost 2" lower.

I would like to get the car sitting higher, with a better shock absorber setup.

196/65 14 just isn't cutting it, performance wise, nor are old bushings.


BUT I digress, as I would like to know if the OP has found what he needs, or not.


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PostPosted: Sun Aug 17, 2014 2:11 pm 
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Joined: Tue Jul 12, 2005 8:36 pm
Posts: 123
Location: Atlanta, Georgia
cool, thanks for the links…hmm, what to do

_________________
Current project - 4G63 street legal rail.


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