1973 240Z Turbo L28 - Melbourne Australia

[thehelix112]

Hey guys,

I just joined and thought I'd add my car to the member's ride bit, funny that, I'm a member, I have a ride, wow.

I have a navy blue 240Z that I purchased from a friend of a friend.

Originally brought with blown head-gasket I drove it with the stock L24 and flat-top SUs ( ) until the SUs decided to develop a flatspot from between 1% and 80% throttle. Holding the throttle anywhere inbetween those two resulted in massive overfueling, a black plume of smoke three lanes wide on the freeway, half a rear muffler and a subsequent police detective motivated pull-over.

After several trips to Ballarat going 100->110, clutch, roll, repeat, I sourced a supercharged L28 replacement. After some clutch dramas during the install I drove the car like this for 6 months or so while I gathered together parts for a turbo conversion.

Then 6 months ago (ok so it might be more than 6 months), after breaking the gear selector linkage on the 280z 5-speed in there I took the car off the road to do the conversion.

Details:

Car:

Model: 240Z

Year: 1973

Colour: BMW Navy Blue (crows feeted to hell)

Front bar: Not standard (?)

Engine:

L28: Block F54, Head P90

Compression: 7.4:1

Cam: Crow #58643 Intake: 212 deg 0.075" dur, 0.480" lift, Exhaust: 210 deg 0.075" dur, 0.495" lift

Pistons: Standard

Rods: Standard

Crank: Standard

Displacement: 2753cc (Standard).

Oil cooling: Earls thermostat to 235x147x50mm Serck cooler.

Balancer: Custom Chris Wood built using BMW Inline 6 balancer.

Driveline: *cough*

Gearbox: FS5C71A *cough*

Clutch: 5-puck ceramic with 1100kg pressure plate

Diff: Standard R180 *cough*

Driveshafts: Standard *cough*

Tailshaft: Custom using oversided hardy spicer joints.

Fuel System:

Tank: Standard

Lift pump: Carter 110gph

Surge: CM510 alloy around 1-2 litres

EFI pump: Bosch 044

Fuel feed line: dash-8 (1/2" ID) line

Fuel rail: custom

Injectors: 460cc N/A S5 RX7

Regulator: Bosch adjustable rising rate

Control/Ignition:

Type: EFI - fully sequential injection

Computer: Autronic SMC v 1.91

Distributor: Custom hall-effect

Leads: Sorcher 8mm induction

Coil: Bosch 716HEC transformer type

Ignition Module: Bosch

Induction:

Manifold: Standard 280zx EFI

Throttle body: Ford XF Falcon 65mm

Piping: 2.5" stainless

Intercooler: ARE 520x300x90 bar and plate

Turbocharger: 620hp Garrett GT35R (0.82 turbine housing)

Exhaust:

Manifold: Custom Ian Rowlerson: stainless, tigged, tuned length, split pulse collector, external wastegate flange

External wastegate: Sub-zero 55mm

Exhaust: 3" mandrel bent mild dumper to 2.5" press bent street system and 3" side exit race system. 2.5" screamer off wastegate

Suspension and Wheels:

Springs: Lowered Kings progressive all round

Shocks: Gabriel POS, don't ask my why.

Sway bars: Whiteline adjustables all round

Wheels: 14x6 dealer option `jelly beans'.

Tyres: 195/75R14 Pirelli P400s

Performance:

Power: unknown as yet

0-100kph: unknown as yet

Quarter Mile: 12.83 @ 115MPH

Fairly obviously the driveline will need some serious work in the very near future. I have a 4.4:1 R200 sitting there waiting to go in and plan on a RB25DET gearbox.

[thehelix112]

Some more pics

[Zedrally]

Welcome to the site.

Nice ride, how many coppers have you outrun on the Western Fwy!

There is a current project in establishing a register in Oz, could you add your VIN so your pride & joy can be added or go to WA ZCAR [from memory] & add it there.

Cheers

MOM

[thehelix112]

Mike,

Will get the VIN when I go up this weekend to tune it and post it here. WA ZCAR?

Dave

[Zedrally]

http://www.wazcars.com/

has an online register.

The one in NSW [if it still exists] doesn't appear anywhere?

MOM

[thehelix112]

Ahhh.. the s on the end. Stupid me and stupid google.

Will do,

Dave

[thehelix112]

Just thought I'd update my ride, I went to the drags for the first time on the weekend, ran an 12.83 @ 115MPH with 11psi boost, single spinner diff, 195 pirellis.

Couple of pics:

http://www.burnoutsunlimited.net/events/nissdat2005/DSCF9073.JPG

http://www.burnoutsunlimited.net/events/nissdat2005/DSCF8889.JPG

[PET-240]

Hey there Dave,

Couple of questions, why on earth would you want to go to 4.4 ratio? Have one in my 70 Zed and it drives me nuts, I only get to drive it on weekends so I don't know how you will go as a daily d. Great for circuit work though, brilliant at Lakeside, back in it's day. You will have a real short relationship with first, so you will want to groove your syncro's in first and second if you want real quick changes form the box. Mine ran a 13.1 @ 109mph with this diff and with 165kW @tw, should be quicker with the weight of these cars. Currently changing it to a 3.7 or 3.9 from an 83 280ZX, as these came with an R200 and CV shaft rear and disc brakes and I dont need to go on. Second Question, how do you find the cam profile in relation to boost? The 280 also has a turbo/inj 2.8 so I'm looking at transplanting that into my 240. Lightening the flywheel for a bit more fun. Was a nat asp version so if anyone can give me a hint on cr for these would be appreciated.

And it certainly looks like you are having a bunch of fun.

Any pics on the 510?

Drew.

[thehelix112]

Drew,

Ratios are still up in the air, 4.4:1 will be crap for anything except very tight tracks, I've got a 3.36:1 and another LSD centre for it, would love to get my hands on a 3.7 LSD as well. Should keep all the based covered. In reality I think the 3.7 or a 3.9 would be much more useful than a 4.4.

Cam profile in relation to boost, can't really answer this one, the cam is the most tame Crow cam you can get and I've never driven the engine without it. Feels just like a standard one except perhaps a little happier to rev. You can look and play with some different engine combinations' CRs and what not at: http://www.ozdat.com/ozdatonline/enginedesign/

8.25:1 is the CR according to the info there.

Dave

[boostedz]

I was going to ask the same thing, that 4.4 ratio rear end will have you going crazy and will really hurt your times with the turbo, especially. Turbos love load mind you and with that GT35 I think you would be well suited with a 3.7 or even the 3.36, if well transmissions are like here and you have the later, higher geared transmission, then the 3.36 should work well.

In any even you most definetly need a LSD. That peg legger is not helping you at all.

[PrOxLaMuS©]

I would have to agree.. upgrade to a 3.36 or 3.54 you will LOVE IT

[thehelix112]

Yep. I've got a 3.54:1 R180 locker that will be going in as a temporary measure. Until I can get a different ratio for the R200.

Dave