Jeremy Pinsly

Dumb question---

I bought a set of used H&R green sport springs from a fellow Rennlister.

One pair of springs is longer than the other pair.

Which ones are for the front---the longer or shorter ones?

I haven't pulled the old suspension off yet so I can't compare.

jimq

Long ones are the rears

LouZ

Just got my new ones also, the rears are marked "H&R F/S" and "Carrera 2/4 HA (R)". Thinner and taller and the bottom has a flat spot.

The fronts are "H&R G/B" and "Carrera 2/4 VA". Fatter and shorter.

Adrian

Did you confirm that this set was for the 1990 model year 964?
Rear spring requirements for the original and revised 964 suspensions are different.
Ciao,
Adrian.

Jeremy Pinsly

Adrian,
I checked on the H&R website and they list the same part # for the springs for model years 1990 through 1993. What would be different about them?

The springs are marked with "Carrera 2/4 VA" and "Carrera 2/4 HA". They also say H&R 91.

LouZ

I checked the box - part # is 29813, and it is for '90 to '93. You should be good to go. Since I don't live in the 2 season climate (hot and hotter), I am waiting for tolerable weather to work in the garage.

Jeremy Pinsly

Thanks Lou

Adrian

Jeremy,
The standard rear springs and rear shock absorbers for 964s built after 01 Nov 90 are 1.5 inches longer than those used prior to 01 Nov 90 (approximate date by the way).
If the springs you have are replacements for the longer springs which have a higher pre tension requirements than the earlier springs, fitted to a longer shock absorber how are they are going to provide the same lowering ability for a shock absorber assembly that is 1.5 inches shorter, has a shorter spring and lower spring pre-tension?
I honestly don't care what catalogues say because I cannot see how they can provide the same spring for the two different length assemblies and provide the same result.
If you car looks like somebody jacked the rear up when you have finished at least you will know why.
H&R used to make a set of lowering springs for the pre and post rear suspension system revision along with two different rear shock absorbers (made by Bilstein).
Ciao,
Adrian.

LouZ

Jeremy

I just double checked the H&R shipping box. It emphatically states that the springs are for '90 to '93. I also checked the PET 5 numbers for '90 C2 and the rear spring is 964 333 531 -XX (color mark denoting spring tension, -02= Blue, -03= Green, -04= Orange and -07= Violet). I then checked the rear spring part numbers for a '93 C2, and they are listed as exactly the same (down to the -XX color for spring tension).

Too many Planets are in alignment, go for it like I am on that 1990 C2.

banzaisan

Jeremy,

I sold my shocks/springs to the guy you bought them from. It came off my 93 C2 Coupe. I replaced my system with Moton's with Hypercoils. If you have any questions, let me know.

Adrian

The 1990 C2 and the first of the 1991 model year C2s use the blue coded rear springs with dash no. 02.
The longer springs are coded orange and are dash no. 04 (which are the same length as the green coded M030 springs).

I have contacted H&R in Germany and asked the question of them. Their certification documention from 1999 suggests that these springs are progressive front and rear and work on all models.
I have asked for an explanation seeing as the original rear coil over is 1.5 inches shorter in overall length than the revised when pre-tensioned correctly.

For their coil over kits H&R provide two different part numbers. One for the original 964 rear suspension and one for the revised 964 rear suspension.
I have also asked for an explanation on this as well.

Porsche original rear suspension system components and the revised system components are NOT interchangeable. That is why I have a basement full of RS America parts.
Ciao,
Adrian.

PS: The Porsche dash no does NOT indicate spring tension.

PSS: RUF still show the different lowering kits for the 90 and 91 model 964s.

jimq

sort of OT but its for this change over. Is the tool for turning the perch on the bottom of the shocks for the springs a off the shelf Autozone/Pepboys type adjusting tool?