GT500 / GT350R springs on Mach 1

[Mikepol2]

Also, I forgot to ask what are your tire sizes?

Front 305/30, rear 325/30

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[Mach1Racer]

Makes me wonder how much heavier the gt500 motor and Trans is. When looking at the spring picture closeup I was wondering about this.
If I had a stock hp car I couldn't get past the curb in front of my house.

2022 Mach 1 curb weight is 3,868 lbs.
2022 GT500 curb weight is 4,183 lbs.

A difference of 315 lbs, which I assume is due to the Superchargerand and maybe the larger brakes and DCT trans.

The shipping weight of my TVS2650 Odin was 114lbs.

The whole reason for seeking these springs is that they obviously are made to compensate for the extra nose weight of a Supercharger; as well as other handling dynamics due to the extra power loading capabilities.

The higher spring rate and riding height might be helpful. Secondly, the HP Mach 1 seems too low in the front particularly with a 100 lb + Supercharger sitting in the nose.

Mach 1 HP spring rates: front 211 rear 742 lb/in

Mach 1 spring rates: front 194 rear 657 lb/in

GT500 spring rates: front 251 rear 885 lb/in

I hope I will find a set soon.

 

[GTP]

Driver front: 27-1/4
Pass front: 27-3/8
Driver rear: 28
Pass rear: 28

Front 305/30, rear 325/30

The difference in radius for those tires is about 1/4". If the tire sizes were equal, then adding 1/4" to the front arch height we get about 27.5", or 1/2" lower than the rear.

The calculation seems fine to me, although the gap above your front tire does seem off. And my calculation does not take into consideration the height of your plastic fender extenders.

 

[Mikepol2]

I installed GT350 springs on my 2018 GT. Spring rate increased from 165 lbs to 194, but it dropped 1/4". Don't understand how a similar increase from the HP springs to the GT500 springs raised it 1-1/4"... something must be going on here that I'm missing.

 

[Scat2018]

Driver front: 27-1/4
Pass front: 27-3/8
Driver rear: 28
Pass rear: 28

Front wheel gap:

This in my Mach 1 with the whipple & about 4/5 HPDE track days.did u measure the front at the fender or the bottom of the plastic wheel lips?

 

[Scat2018]

it’s 26 3/8 to the bottom of lip on drivers side & 26 5/8 on passenger side

 

[Mikepol2]

This in my Mach 1 with the whipple & about 4/5 HPDE track days.did u measure the front at the fender or the bottom of the plastic wheel lips?

At the wheel lip, so I'm sitting about 3/4" higher than you. Gonna take it out today and drive it hard and see if anything settles in more. I guess it isn't really BAD, it just doesn't look good. People lift the front ends of trucks all the time with no issues.

 

[Scat2018]

I’m hoping to get my GT500 front springs on in the next few weeks. I purchased new ones and a set off of eBay for the rear unfortunately we only have the option of raising the front end up or getting rid of the handling pack front splitter.
Ps: if you drive the car on the street

 

[Scat2018]

I’m Sure if you drive it for a few weeks it will come down at least another quarter inch. I only want to raise it about a half inch but if it ends up being 3/4 of an inch that’s not too bad.

 

[Scat2018]

At the wheel lip, so I'm sitting about 3/4" higher than you. Gonna take it out today and drive it hard and see if anything settles in more. I guess it isn't really BAD, it just doesn't look good. People lift the front ends of trucks all the time with no issues.

Did it settle down at all a little bit?

 

[Mikepol2]

Did it settle down at all a little bit?

Nope, looks like it’s at its final height. 27-3/4” to the highest metal point of the front fender lip, 28” in the rear.

 

[Mikepol2]

Bought a set of 350R front springs to try. 10 pounds softer than the 500s I have on now, interested to see if they lower the car back closer to stock height. May have unknowingly got lucky, Benny at Levittown says they are the only pair in stock nationwide.

 

[GTP]

Just yesterday I installed CFTP front springs on my GT.
Ride height increased 1/8" on one side, none on the other.
Free length of this spring is only 10".

 

[13GetThere]

Watching for the information and notifications.

 

[Mikepol2]

Just got the new 350R springs today from Levittown. Wire diameter measurements:

Mach 1 HP: .565”
350R: .590”

However, the 350R springs are substantially shorter, about 3/4". Now I'm hesitating to install them because the front would be lowered but not the rear, although with them being stiffer, it probably wouldn't be lowered the whole 3/4". Also, the stock splitter height was already really low and with the new springs it would be even lower. Going to have to think about this.

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