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| * Stock engine | * Stock engine | ||
| - | * Loop piping from stock exhaust manifold | + | * Loop piping from stock exhaust manifold ([[Turbo exhaust manifolds#J-pipe|J-pipe]]) |
| *: {{ThumbH|999}} {{ThumbH|5881}} {{ThumbH|5904}} {{ThumbH|5906}} | *: {{ThumbH|999}} {{ThumbH|5881}} {{ThumbH|5904}} {{ThumbH|5906}} | ||
| * Small Wrecking yard turbo ($100). If sized small enough, no wastgate or blow-off valve is needed | * Small Wrecking yard turbo ($100). If sized small enough, no wastgate or blow-off valve is needed | ||
Revision as of 10:45, 16 July 2018
Forced induction comes in two forms: Supercharging and Turbo-supercharging. This article will focus on the turbocharger. For a comparison with the supercharger, see Forced Induction.
For the turbo compressor itself, see Turbos
Contents |
Overview
For specific turbocharger models, see Turbos
Big Power from a stock A-series engines can be had by adding a turbocharger. A turbo setup on an A12 makes more power and torque than a worked non-turbo A14, for a fraction of the build cost.
See Main Article: $1200 EFI Turbo A12
Turbo setups range from modest to wild.
Discussion: POST regarding Turbocharging A12
Stage 1
20% more HP than stock.
A stock A-series engine can take 10 psi. You don't even need an intercoolor, and so you can use draw-through on a stock carburetor. But blow-through is easier.
- Stock engine
- Loop piping from stock exhaust manifold (J-pipe)
-
- Small Wrecking yard turbo ($100). If sized small enough, no wastgate or blow-off valve is needed
- Tee into the oil pressure line, feed it into turbo. Tap a return line into the oil pan
- Piping from turbo to stock carburetor via a top hat
- Set initial timing at 3 degrees
- In the distributor, weld the advance slots partially to limit mechanical advance
- Keep the stock vacuum advance (it will have no effect under boost)
- Fit larger power valve to carburetor
- Fit secondary main jet two sizes larger
- Stock fuel piping with medium pressure fuel pump (above 10 psi)
Limit boost to 5 psi.
Or go to 10 psi for short bursts on cooler days.
Stage 2
10 psi. 40% more HP.
- stock block and head
- Fit Intercooler (precludes use of draw-through)
- Box the carburetor to go higher than 10 psi
- Rejet primary main two sizes larger. Secondary main 3 sizes larger. Power valve increase.
- Retard timing to 0 degrees. Connect vacuum advance up directly to manifold. This will help idle and starting out under low throttle, but the vacuum advance will have no effect under boost
- Use 75.5-degree thermostat
- High volume/high pressure fuel pump
- anti-surge tank up front
- Use custom exhaust manifold to mount the turbo
- 2" exhaust
- H165 rear axle
Stage 3
100% more HP than stock. Requires modified engine, but not high-RPM usage.
2 bar (28.2 psi)
1 bar (14.7 psi)
Do all the stage 2 modifications plus:
- Use new Nissan rod bolts, torque to spec
- Use ARP head studs
- Fit Intercooler (precludes use of draw-through)
- Custom pistons for low compression (7:1)
- A12GX head, ported
- Copper head gasket
- Oil Cooler
- EFI (or professionally modified & tuned box carburetor)
- custom inlet manifold with large runners
- 2.5" exhaust
- Carefully-sized ball bearing turbo
- 5/16" fuel lines and high volume/high pressure fuel pump
- Fuel tank modified with baffles, or anti-surge tank up front
- Custom-recurved distributor with Electronic Ignition
- Spark retard system
- Water-injection system
- 63-Series Transmission for A-series
- Heavy duty clutch
- H190 rear axle (or H165 rear axle with heavy-spline axles)
- traction bars
Proof
A15ETT
See main article: A15ETT
Twin-turbo A15 by 1200rallycar
A15 Before: 52.3 kw (70.1 hp)
A15 After: 75.6 kw (101.4 hp)
Sikyne's A12
See: POST A12 Turbo Development thread
160+ rwhp @ 15 lbs boost (standard H89 Head) 240+ rwhp @ 24 lbs boost (big valve ported head) 2nd-hand GT2860R (707160-5) ball bearing turbo E85 fuel, intercooled stock and unmodified H89 head Cam: 236 Degrees at .050 lift Maximum advance at 16 psi boost: 23 degrees ARP head studs stock pistons, crank and rods standard headgasket about 120 Lb Ft from 5100 to 6800 RPM @ 15 psi
dyno chart
Turbo systems
Oh boy, there are a lot of choices when turbo-ing your engine.
Builds
B20 A15
A15 with Toyota CT12 turbo
josh_c
Suck-through SU, the classic setup
slam1024
slam1024 added a turbo
* 1973 Datsun 1200 2-door sedan * Custom manifold with runners from Tercel * stock SU blow-through setup from 1.3 liter MG Metro Turbo
kegs
Turbocharged A15 Twin Dellorto DHLA 45 carburetors on Redline manifold Custom airbox hat Garret A/R 48 turbo Intercooler from 200SX 2.5 inch dump pipe Liverpool Exhaust
fat910
Unmodified A12 short block 8 to 10 pound boost hi flow garrett t2 custom hat and weber carb custom sump vl turbo fuel pump with malpassi fuel reg saab turbo bov
It is easier to build up a 120Y engine instead of a 1200 engine as the alternator is not on the exhaust side
blow through A12
Top-hatted carburetor on A12
frankthedolphintrainer
Weber 32/36 blow-thru with frankthedolphintrainer turbo manifold
Intercooler
Empson
A series suck through turbo setup by James Empson (twitch@bigpond.com) 2008/05/01 Datsun B10 coupe
The turbo is an IHI - RB6, originally off a mitsubishi Galant 2 litre. the exhuast manifold is off an A15, with a flange welded onto it. The inlet manifold is suited to an Oval port head, the SU is a 1.5 inch.
datsonovic
Zenith-Stromberg 1.75 with T04 turbo
datsmokin
oan78
A12 Sedan with Weber and Hitachi turbo
A12 wagon with 175 Stromberg and Mazda 20B turbo
rice
For maximum boost, use a large turbo. Lag is heavy, but still operable.
* Drawthrough * 45 Weber DCOE carburetor * T4 turbo @ 10 psi * Compression ratio: 8.2:1
topgear
A12 turbo made 100kw rwhp on 12-13 lbs boost
- stock block except for new rings
- A14 head
- suck-through SU carburetor
- no intercooler
Photos
See Turbo Manifold Photos Turbo Photos 1 Turbo Photos 2 Intercooler Photo Index
