Chevy Performance Suspension?

[kevjam79]

There are three options: "FE1", "FE3(Sonic RS)" and "FE4". I have installed the GM Performance Suspension which replaces my 1LT - FE1 suspension. The GM Performance suspension is above and beyond the FE3. It contains new rear shocks, front struts and 20mm lowering springs. The issue in question, does the new GM Performance suspension (GMP) now carry the RPO designation of FE4? Or should those installing the GMP suspension use the FE3 specs? The FE3 to GMP upgrade includes 10mm drop via springs with upgraded rear shocks.

Clear as mud?


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[mattyd99]

are these a direct bolt on? do you need a spring compressor to put these together?

 

[kevjam79]

Yes, they are a direct bolt-on. Considering these have a curved spring, I would recommend using a shop spring compressor. My shop did what I was unable to do in an hour for one in about 15 mins for both. I plan to add my experience to this thread or create another in a few days.


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[Kyman]

Just a little curious as to what website you guys got these off of or if you went to the dealership to get them.

 

[laborsmith]

I suspect Sonic Owners Forum Crate Engine Depot could set you up.

Laborsmith

 

[TurboSonic18]

I ordered mine through Crate Engine Depot. Dealership wanted $900 for parts and labor, Parts online were $500 including shipping.

having some buddies come over this weekend to help install , go free labor!

 

[kevjam79]

Less than $400 on eBay for non-RS with free shipping.


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[kevjam79]

Has any had trouble with one of the rear springs settling more than another?


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[Luv2xlr8]

Are these RS springs with a more beefier shock? Because I know the RS suspension lowers it 10mm which is what you stated.

 

[kevjam79]

No, new springs and shocks.


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[mattyd99]

Do you need a alignment after these are put on?

 

[kevjam79]

Yes.. I recommend the FE4 settings. I plan to setup a thread to provide a few bits of info.


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[shorebreeze]

Any update on these alignment settings?

Also, while I'm in the thread, I had decided last year to stay put with stock but am now deciding whether to put a rollbar on (ZZP) or install this performance suspension kit. The main goals I have in mind are to a) reduce the harshness of the ride over small potholes and broken pavement; b) reduce the float and roll in highway driving; c) reduce the tippyness in slow-speed maneuvering. I've ruled out Eibachs as they drop the car too much for winter driving and for city curbs, and I'm skeptical about the cost of coilovers.

Will the performance suspension kit do what I want? Would the rollbar and endlinks alone do most of it?

 

[kevjam79]

I would do both.

The FE4 setting on a Hunter alignment machine is the way to go.
I have been overwhelmed at work and home. As the fall sets in and things settle down, I will hopefully have time to put together a complete car write-up.


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[carsNskis]

Any update on these alignment settings?

Also, while I'm in the thread, I had decided last year to stay put with stock but am now deciding whether to put a rollbar on (ZZP) or install this performance suspension kit. The main goals I have in mind are to a) reduce the harshness of the ride over small potholes and broken pavement; b) reduce the float and roll in highway driving; c) reduce the tippyness in slow-speed maneuvering. I've ruled out Eibachs as they drop the car too much for winter driving and for city curbs, and I'm skeptical about the cost of coilovers.

Will the performance suspension kit do what I want? Would the rollbar and endlinks alone do most of it?

The GM Performance suspension firms up the body roll without becoming "harsh." It maintains a comfortable ride but creates confidence in high speed maneuvers and cornering.

I can't attest to the end links or roll bar effect, but I do plan to add them as I intend to do some track events in the Spring

.....it's not the size, it's how you drive it

 

[andrewjc]

So would this setup work with 15" rims? I want to do this in the future but debating sticking with 15's or going to 16's. Thanks....

 

[carsNskis]

So would this setup work with 15" rims? I want to do this in the future but debating sticking with 15's or going to 16's. Thanks....

Size of the wheel won't affect anything (the overall diameter of the wheel+tire stays the same). If you're changing from stock wheels just pay attention to your offset.

Lots of guys in Thailand running track cars on 15's and 16's

.....drive it like you still owe the bank money

 

[kevjam79]

I think these wheels would be great with the stock tire size:

http://www.ebay.com/ulk/itm/291159472347

15x7 with +40mm offset


14 Sonic LT 1.8A MBM

 

[andrewjc]

Thanks for the replies. I want to do the suspension soon. Just having a hard time figuring out which way to go. In the end it's a daily driver with a short and miserable commute. I have seen those wheels they do look nice. I just wonder how much they weigh.

 

[kevjam79]

Thanks for the replies. I want to do the suspension soon. Just having a hard time figuring out which way to go. In the end it's a daily driver with a short and miserable commute. I have seen those wheels they do look nice. I just wonder how much they weigh.

I thought the same. I emailed Raceline last night. I will hopefully have an answer in a couple of days.

I am also curious how they are formed. Gravity cast, etc?


14 Sonic LT 1.8A MBM