I've collected some spring and shock data over the years. This is a basic summary. Most of the data is verified by at least one source like mfr data sheet. I'm currently running Tein H and KYB Adjustable on the softest settings. Not too bad a ride... no bounce; but in order to gain the drop I want, the spring rates have to be higher than I'd prefer. There's no way to get around that unless you prefer to bottom out over speed bumps. OEM TT Front: 168 lbs/in or 3.0 Kg/mm TT Rear: 134 lbs/in or 2.4 Kg/mm NA Front: 168 lbs/in or 3.0 Kg/mm NA Rear: 123 lbs/in or 2.2 Kg/mm Source: Factory Service Manuals ('91 and '93) Eibach Spring Rates (Progressive Rates) TT Front: 182 lbs/in up to 251 lbs/in TT Rear: 142 lbs/in up to 199 lbs/in Tien H tech P/N-SKP46-BUB00 Approx. Lowering 0.8” Front and 0.2” rear Front Spring Rate - 3.3 kg/mm / 185 lbs/in Rear Spring Rate - 3.2 kg/mm / 179 lbs/in TEIN S Tech P/N SKP46-AUB00 Approx. Lowering: 01.4"F / 082"R Front Spring Rate - 3.5 kg/mm / 196 lbs/in Rear Spring Rate - 3.4 kg/mm / 191 lbs/in Shocks
KYB Z32 Excel-G Shock Set (GR-2) $250 Cheapest twin tube, non-adjustable Tokico HP Shocks (Set of 4) $350 non-adjustable KYB AGX Adjustable Shocks (set of 4) $410 Adjustable compression and rebound 4-way front, 8 rear… adj knob on side so adjustment w/o remove interior panels. Tokico Illumina Shocks (Set of 4) $630 adjustable 5-way adjustment settings changes both rebound and compression damping (remove rear panel) Koni Yellow Sport Adjustable Shock (Set of 4) $600 est Adjustable rebound only…top knob, 360’ variable - no detents. (panel removal reqrd) For cars lowered less than 35mm, or 1.378" Hybrid Coilover
Ground Control Front: 350 lbs/in (6.2 kg) Rear: 250 lbs/in (4.2 Kg/mm) Lowering about 2” front and rear 4.32F inches of shock travel 4.51R inches of travel. Springs, sleeves, top hat, etc. $520 shipped Buy/use your own shocks – Koni’s would be another $600 Tanabe Sus Tec GF210 Lowering Springs $200 used Mike Nova Down Data: 1.5 in / 1.1 in Spring rates: Front: 3.4kg (191 lbs/in) / Spring Rate: Rear: 3.8kg (213 lbs/in) Manzo (eBay Chinese for comparison only ?? Approximate Drop: 2" Front & 1.75"-2" Rear Spring Rate: 300lbs Front & 250lbs Rear Z32 Tokico Illumina Shocks (all four $628 from z1) Front $200 Rear discontinued… adj from top so interior needs to be removed.
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