Question regarding SP763 springs

[Stymee]

So I did a little snooping on struts

It looks like 2017 PP1 Strut is the same as a base 2019 Strut? It’s a different part number but crossed to the same part number between yrs

FR3Z-18124-AB

This number crossed to the 17 PP1 Strut but in a 19 is a base shock?

So why would I need to replace my 19 strut and shocks running the 763 setup if its in fact a 16-17 PP1 strut?

I’ve seen people recommend these springs for 17 PP1 cars and my 19 base struts the same 17 PP1 strut?

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[TheMegalodon]

Yes the SP763 springs are well suited to the performance pack dampers. Yes the 19 base uses an improved damper setup similar to the performance pack 15-17 dampers. You don’t have to replace your dampers right away but they will still wear down at an accelerated rate because they’ll be working hard given the reduced ride height and travel. The factory rear shocks don’t really offer enough damping to begin with so while you will have less float, you may see a bit more bounce.

 

[Stymee]

Yes the SP763 springs are well suited to the performance pack dampers. Yes the 19 base uses an improved damper setup similar to the performance pack 15-17 dampers. You don’t have to replace your dampers right away but they will still wear down at an accelerated rate because they’ll be working hard given the reduced ride height and travel. The factory rear shocks don’t really offer enough damping to begin with so while you will have less float, you may see a bit more bounce.

so maybe just replace the rear shocks for now?

 

[TheMegalodon]

If you don’t have too many miles on the car your could continue using your factory setup with the springs for a while. You’ll have to do everything again when the dampers need to be replaced.
The thing about the performance springs (I have the SP763 kit) is they are close to the factory spring rates so I’ve read that an FRPP track shock or potentially even a Bilstein shock (both) monotube, can offer more damping than the rear springs can handle.

The rear suspension in this car is fickle and it can be a challenge to match the right shock to the right spring. If you don’t have enough spring to support the rear, a softer pair of shocks will ride the bump stops (even trimmed ones). That’s the issue I’m having now with my Koni Active shocks but I also believe my rear dropped more than the 0.5” BMR advertises.

I have no problems with my front struts/springs; they ride fine.

I’m curious how the BMR minimum drop front performance spring with their rear drag spring would pair with a set of FRPP track dampers (highly recommended).

I would say invest in a good set of bump stops like the ones Eibach pairs with their ProKit springs (Summit racing sells them separate). They’re a much better design than the factory ones and the FRPP jounce bumpers are trimmed stockers so don’t bother.

 

[Stymee]

Yea I have 1200 miles in my struts and shocks

So just go 763 kit and the bumps stops by Eibach but which bump stop kit should I get, the version that come in the pro kit?

 

[TheMegalodon]

Here is the PDF install guide for the Eibach pro kit springs with the part numbers for the Eibach bump stops
https://www.cjponyparts.com/pub/media/images/install-pdf/install_ebs28-1.pdf

Front: https://www.summitracing.com/parts/eib-ebs770044
Rear: https://www.summitracing.com/parts/eib-ebs770060

 

[TheMegalodon]

The S550 rides on its rear bump stops from the factory so they factor in to how well the car rides. The factory bump stops don’t offer enough compression at lower ride heights and when cold. The Eibach bump stops compress better, are softer from my understanding and have a better design (shape).

My issue is likely related to the rear bump stops being too hard and constantly hitting the rear shock body causing the shock to unload upon impact and reducing rebound. I’m waiting to get the Eibach bump stops to hopefully solve the problem. If not then I know the Koni Active shocks are not well suited to a lowered ride height because Koni states they won’t work well when hitting the bump stops (by design). Other rear shocks don’t suffer from hitting the bump stops.


Simply put: buy the SP763 kit cause it’s said to be excellent for street daily driving, keep your dampers for now and buy the Eibach bump stops.

 

[Stymee]

The S550 rides on its rear bump stops from the factory so they factor in to how well the car rides. The factory bump stops don’t offer enough compression at lower ride heights and when cold. The Eibach bump stops compress better, are softer from my understanding and have a better design (shape).

My issue is likely related to the rear bump stops being too hard and constantly hitting the rear shock body causing the shock to unload upon impact and reducing rebound. I’m waiting to get the Eibach bump stops to hopefully solve the problem. If not then I know the Koni Active shocks are not well suited to a lowered ride height because Koni states they won’t work well when hitting the bump stops (by design). Other rear shocks don’t suffer from hitting the bump stops.


Simply put: buy the SP763 kit cause it’s said to be excellent for street daily driving, keep your dampers for now and buy the Eibach bump stops.

Thanks.....

 

[Jonyxz]

The thing about the performance springs (I have the SP763 kit) is they are close to the factory spring rates so I’ve read that an FRPP track shock or potentially even a Bilstein shock (both) monotube, can offer more damping than the rear springs can handle.

This is bad news. I was planning on this setup to upgrade my base '19.
Can someone confirm if frpp track are too much damping for the sp763?

 

[moffetts]

This is bad news. I was planning on this setup to upgrade my base '19.
Can someone confirm if frpp track are too much damping for the sp763?

I almost went down that road, but bmac and Norm recommended against it. I ordered SP083s and I think it was the right decision given the increased damping of the FRPP parts.

 

[TheMegalodon]

Yeah what Moffetts said. I did a complete read of this thread:
https://www.mustang6g.com/forums/th...date-springs-shocks-coilovers-etc-read.22036/

The general consensus is if you want to pair BMR springs with the FRPP track dampers, the BMR handling springs are better matched.

I don’t know how the Bilstein dampers ride with the SP763 set so maybe someone could chime in there.

Main thing with the rear suspension is you’ll need higher spring rates if you’re going to use a beefier damper.

Linear springs can definitely offer great handling and ride characteristics on this chassis but need the right dampers.

If you plan to use Koni dampers they recommend Eibach Pro Kit springs - progressive, 1.1”F/1”R drop and top notch bump stops.

I would highly recommend doing a lot of reading to see what other owners have to say about certain combinations.

IMHO the BMR SP763 has not paired well with the Koni Active dampers in the rear but manage alright in the front.

Steeda also has some minimum drop springs options that they have paired with their own dampers tuned properly for those spring rates.

 

[Jonyxz]

Yeah what Moffetts said. I did a complete read of this thread:
https://www.mustang6g.com/forums/th...date-springs-shocks-coilovers-etc-read.22036/

The general consensus is if you want to pair BMR springs with the FRPP track dampers, the BMR handling springs are better matched.

I don’t know how the Bilstein dampers ride with the SP763 set so maybe someone could chime in there.

Main thing with the rear suspension is you’ll need higher spring rates if you’re going to use a beefier damper.

Linear springs can definitely offer great handling and ride characteristics on this chassis but need the right dampers.

If you plan to use Koni dampers they recommend Eibach Pro Kit springs - progressive, 1.1”F/1”R drop and top notch bump stops.

I would highly recommend doing a lot of reading to see what other owners have to say about certain combinations.

IMHO the BMR SP763 has not paired well with the Koni Active dampers in the rear but manage alright in the front.

Steeda also has some minimum drop springs options that they have paired with their own dampers tuned properly for those spring rates.

I live in Puerto Rico and city streets here are pretty bad...I'm afraid handling springs might be too stiff for these roads...hard to decide

 

[Bluemustang]

This is bad news. I was planning on this setup to upgrade my base '19.
Can someone confirm if frpp track are too much damping for the sp763?

It shouldn't be. Many guys have used these dampers with a variety of the usual aftermarket springs. The closest match would be the GT350 or GT350R springs, but that doesn't mean it won't work for your application.
If you are dead set on the SP763 spring set, I'll think it'll work out very well for you. However, if increasing handling is your goal, you might want to step up to some stiffer springs like the GT350R or SP083.

 

[TheMegalodon]

I live in Puerto Rico and city streets here are pretty bad...I'm afraid handling springs might be too stiff for these roads...hard to decide

People who’ve talked about the FRPP dampers have said they work great at handling New York roads.

I regret not just buying the FRPP track dampers set given the price, the versatility and the fact they have monotube rear dampers, which for their application work well in handling rough pavement.

 

[Bluemustang]

People who’ve talked about the FRPP dampers have said they work great at handling New York roads.

I regret not just buying the FRPP track dampers set given the price, the versatility and the fact they have monotube rear dampers, which for their application work well in handling rough pavement.

A well tuned monotube damper is hard to beat. Not very surprising that the recent feedback on the Bilstein B6s are so highly rated as well.

Also, I believe @MustangCollector, who had a long, long suspension thread detailing many combinations he used - he tried the SP080s with the FP dampers and loved them. Someone please correct me if I am mistaken. The SP080s are the same rates as the SP763, only a larger drop in the front. So stands to reason the SP763s would ride even better with them given the extra suspension travel. If there are any bad reviews on the FP dampers I haven't seen them.

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