Lowering springs journey
11-08-22, 03:01 PM
#1
Pit Crew
Thread Starter
Lowering springs journey
So its a 2017 f awd.
got rsr down springs.
installed only the fronts and kept it like that for a couple of months. Ride was nice luxurious and sporty the front was good in the turn. All perfect with the ride. And the rsr front springs are exactly the same stiffness over bumps like rear oem, maybe even a little bit softer than rear oems. They are 5k (kg/mm)
then I decided to also install the rear ones for an even drop. They are 8.6 k. For me that was a mistake. They are way too stiff and it lost the comfortable ride. Now I put the stock ones in the back and happy with the ride.
got rsr down springs.
installed only the fronts and kept it like that for a couple of months. Ride was nice luxurious and sporty the front was good in the turn. All perfect with the ride. And the rsr front springs are exactly the same stiffness over bumps like rear oem, maybe even a little bit softer than rear oems. They are 5k (kg/mm)
then I decided to also install the rear ones for an even drop. They are 8.6 k. For me that was a mistake. They are way too stiff and it lost the comfortable ride. Now I put the stock ones in the back and happy with the ride.
11-09-22, 06:05 PM
#4
Do you have any pictures of the car dropped on RSR down front only?
I am still trying to figure out what I want to do with my car. Given a big budget, I'd do RSR coilovers with Down rear springs, as the RSR dampers are designed to work with those rates. I get the distinct feeling that the RSR rear spring, while great for handling and neutralizing the heavy understeer in our cars, is too stiff for the AVS rear shocks.
I am still trying to figure out what I want to do with my car. Given a big budget, I'd do RSR coilovers with Down rear springs, as the RSR dampers are designed to work with those rates. I get the distinct feeling that the RSR rear spring, while great for handling and neutralizing the heavy understeer in our cars, is too stiff for the AVS rear shocks.
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11-10-22, 07:12 AM
#6
Pit Crew
Thread Starter
Trending Topics
11-10-22, 07:30 AM
#8
Pit Crew
Thread Starter
Fronts I did myself. For the rears I went to the mechanic, couldn’t do them at home. But mechanic said he wouldn’t wanna do it again because it’s difficult especially to put the stock ones back because they are longer. Now im happy with the comfortable ride and will leave them at that 
11-10-22, 07:39 AM
#9
Pit Crew
Thread Starter
Why I did only the fronts for half a year is:
1) because the front rake looks like an suv and you can see the aluminum parts when you look at the car from the side.
2) I like quick turns and the heavy engine up in the air makes the car lean more on tall springs.
3) tires were wearing on the outside edge because of the leaning.
4) improved steering feel.
6) improved control.
5) too soft for no reason because you still feel the bump with the rear axle which is stiffer and so the peak harshness over bumps stays the same.
1) because the front rake looks like an suv and you can see the aluminum parts when you look at the car from the side.
2) I like quick turns and the heavy engine up in the air makes the car lean more on tall springs.
3) tires were wearing on the outside edge because of the leaning.
4) improved steering feel.
6) improved control.
5) too soft for no reason because you still feel the bump with the rear axle which is stiffer and so the peak harshness over bumps stays the same.
11-10-22, 03:19 PM
#11
Pit Crew
Thread Starter
Why wouldn’t I choose different rates for front and back?
For me its the best setup. Maximum handling with stock comfort. Didn’t have any issues including driving at car limits (of lateral grip).
For me its the best setup. Maximum handling with stock comfort. Didn’t have any issues including driving at car limits (of lateral grip).
11-10-22, 07:51 PM
#12
All 4 sets of springs are matched front to back for weight distribution, based on the front rate to back rate. The aftermarkets are all different but still matched together all 4 sets. .
Why does RSR, Tanabe, Swift not sell just fronts, or just rears? Why are the IS springs both Factory or aftermarket not the same? Even the Spring changes in the GS from year to year and model to model are different. Call a Performance Suspension company and ask them about just throwing on different springs front and rear.
You can run what you want, but all 4 springs are always matched to go together. I would even go as far to say that likely on a track, you would have some adverse effects, and be worst with Factory on one end and aftermarket on the other end vs just stock. There is a lot of Geometry that goes into developing spring rates for cars. Just FYI: for drop looks is one thing. The 2013 Lexus GS350 out handled and out performed the BMW and Mercedes and others on the track stock comparisons.
Why does RSR, Tanabe, Swift not sell just fronts, or just rears? Why are the IS springs both Factory or aftermarket not the same? Even the Spring changes in the GS from year to year and model to model are different. Call a Performance Suspension company and ask them about just throwing on different springs front and rear.
You can run what you want, but all 4 springs are always matched to go together. I would even go as far to say that likely on a track, you would have some adverse effects, and be worst with Factory on one end and aftermarket on the other end vs just stock. There is a lot of Geometry that goes into developing spring rates for cars. Just FYI: for drop looks is one thing. The 2013 Lexus GS350 out handled and out performed the BMW and Mercedes and others on the track stock comparisons.
11-10-22, 08:41 PM
#13
Pit Crew
Thread Starter
Here someone posted on the forum that over the years lexus used different springs. For the AWD they changed 3 springs in the front (original 2012, stifest 2014, then 2015-2019 softest, softer than the original) but never changed the rear springs for my 2017 awd. My 2017 front was too soft so now it rides more like the original gs.
11-10-22, 09:35 PM
#14
Yes Pete posted and he is very knowledgeable about our suspension. Good point, but imo the stock springs are not aftermarket lowering springs. The RSR Downs are the same for all years. I see what your saying but it's still a mix of stock with aftermarket front and rear.