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Old 07-30-2017, 03:41 PM   #1
MikeSr.
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Default Max front spring rate with RSI Saab inserts

I have front coilovers with shortened and rethreaded tubes and 8" 250 lb front springs. I have an aluminum LS v8 which is actually lighter than a red block, but a T56 that is huge and heavy, putting more weight to the rear.
MikeJr. Had the same setup in his 242 Group A replica car ( now sold) and it handles like it was on rails.Rears also 250 with Kaphlenke adjustable spring seats.
28 mm dropped front V8 sway bar and 25 rear.
I have some 19 and 21mm bars for the rear if 25 is too stiff.
I may want to hang another 50-75lbs on the front.
So I am considering going up to 350-375 fronts.
Can the RSI inserts handle it without recalibration?
I plan to weigh the car on all 4 corners, set a little negative camber. The car is going to be low.
Any real world experience with running 350-375 lbs with these inserts?
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Old 08-02-2017, 03:02 PM   #2
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I think the only way to know this is to know what the valving is like on those inserts? Do you know who made them?
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Old 08-02-2017, 03:23 PM   #3
Redwood Chair
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Saab inserts are valved pretty light, but on the bright side if they're billies you can have then revalved.
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Old 08-02-2017, 04:18 PM   #4
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Originally Posted by Redwood Chair View Post
Saab inserts are valved pretty light, but on the bright side if they're billies you can have then revalved.
Yep they poooftie-boy soft valving..
very similar with the ironic named "HDs"..
But with less travel and that is a problem..Less traval at same valving meas you still have to match spring and damper--and as soft as they are that means more or less what stock front spring are..But with short travel you clang out more..
Short travel means you must go stiffer spring which means you must have firmer valving..
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Old 08-02-2017, 04:38 PM   #5
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Quote:
Originally Posted by MikeSr. View Post
I have front coilovers with shortened and rethreaded tubes and 8" 250 lb front springs. I have an aluminum LS v8 which is actually lighter than a red block, but a T56 that is huge and heavy, putting more weight to the rear.
MikeJr. Had the same setup in his 242 Group A replica car ( now sold) and it handles like it was on rails.Rears also 250 with Kaphlenke adjustable spring seats.
28 mm dropped front V8 sway bar and 25 rear.
I have some 19 and 21mm bars for the rear if 25 is too stiff.
I may want to hang another 50-75lbs on the front.
So I am considering going up to 350-375 fronts.
Can the RSI inserts handle it without recalibration?
I plan to weigh the car on all 4 corners, set a little negative camber. The car is going to be low.
Any real world experience with running 350-375 lbs with these inserts?
The Saab bilstiens and 400 lb springs feel like absolute dogsh1t with a V8 up front
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Old 08-02-2017, 04:50 PM   #6
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I never had a V8, but I found the RSI short bilsteins to work very well with 336lb springs.
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Old 08-02-2017, 06:46 PM   #7
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Speaking of RSI short bilsteins, does anyone know the part number, or a good place to get replacements?
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Old 08-02-2017, 07:37 PM   #8
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Old 08-02-2017, 07:55 PM   #9
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Originally Posted by cosbySweater View Post
The Saab bilstiens and 400 lb springs feel like absolute dogsh1t with a V8 up front
Probably even more so with the iron block and turbo adding to the weight over the nose.

Revalve time.
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Old 08-02-2017, 09:22 PM   #10
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Originally Posted by t8fanning View Post
Speaking of RSI short bilsteins, does anyone know the part number, or a good place to get replacements?
They were just stock off the shelf Saab Bilstein HD's unless the customer wanted to pay for custom revalving.

Ideal or not, they do okay with 250-350lb springs. Ride and handling is very subjective, so it may be great for one person and horrible to the next.

I limp my car around on them with 450lb springs. It could use revalving to be great, but it is okay and safe to drive spiritedly.
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Old 08-02-2017, 11:18 PM   #11
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Quote:
Originally Posted by Tuff240 View Post
They were just stock off the shelf Saab Bilstein HD's unless the customer wanted to pay for custom revalving.

Ideal or not, they do okay with 250-350lb springs
Do you remember offhand how much they shortened the strut housings?

I use 300 lb front springs and it feels decent if not a little stiff. But like you say, it's very subjective.
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