Paul’s Z needed new clutch hydraulics and tranny fluid. A common wear item on these cars is the hole for the clevis pin to operate the clutch master cylinder. Over time the pin enlarges the hole making shifting difficult. We welded up the holes and re-drilled so the clutch pedal feels just the way it should. In the engine bay things keep getting better for this sweet inline-6. The standard Mikuni manifold wasn’t the ideal setup for flow when running the triple Mikunis so in anticipation for more power we installed a TWM manifold:
Here is the old Mikuni setup compared to the TWM:
With the new manifold in place we were ready to extract more power on the dyno, however there was a problem with Paul’s carb linkage making synchronization difficult. The traditional solution is to fix the rather intricate linkage system and move on but we thought why not simplify it? The Z’s carb linkage, like many old cars consists of several plastic pieces, caps, levers, arms and bell crank…all parts that fail or gain excess slop from repeated adjustment and years of abuse. Linkages do look cool (or complex) but a much more straightforward solution is to use a throttle cable.
We are stoked with this setup because it clears up the engine bay, makes throttle response more direct and tuning easier. We are especially proud of this mod because of its total reversibility…one can go back to the OEM linkage setup say for that concours restoration or car show. No holes are drilled. Win-win! More pics of the single throttle setup:
With the carbs sync’d we dyno tuned with excellent mid-range gains and peak numbers of 152hp/172tq to the wheels!
At Z Car Garage we love to help people find the right Z. When our friend and fellow Datsun nut Eric G asked if we could help advertise his Z and find a good home for it, naturally we obliged! Eric owns several Japanese sports cars including a nice Datsun Roadster and this 1973 S30 was his autocross/drift daily driver:
This isn’t an ordinary Z though as it hides a complete 280ZX Turbo drivetrain swap including the L28ET, BW T5 tranny, R200 rear end and full disc brakes!
Old school Recaros inside the clean interior and a straight, metallic blue body make it a great driver. Rob thought this was a great fit for his friend in Georgia, James A.
Before shipping the car across the country Rob modified the old-school wastegate acuator to allow a modest increase in boost. This resulted in +20hp/19tq to the wheels:
Loaded up…Georgia bound and ready to stay in the Datsun family!
We are happy to report the Z successfully made it to Georgia and James is already Enjoying The Ride!
Larger than stock, vented Stoptech rotors help shed heat for repeated fade-free braking. Stoptech vs OEM G35 rotors (rear) shown:
The calipers look great behind Volk SF Challenge wheels:
Better braking capacity to reign in that grin-inducing power plus good looks!