What head is best for forced induction (supercharger)

[PRIMRK]

Just looking at my options of what to used in an engine build, what head is the best for forced induction via a SC14 charger?

So far im planning on using a 7afe block/crank w/forged rods + pistons and the sc14 with a 70mm solid pulley (approx 14psi) and im just trying to get some info on what head would better suit this application, big port, small port, 20v, black top, silvertop?!?

Anyone else done the 1.8lt build with a charger?

(i like chargers for drivability sake and that you never fall off boost and theres nothing like a good whine)

[Sam-Q]

I have wanted someone to do this for a long time. Use the earlier model 4agze pistons to offset some of the compression ratio increase. I was under the impresson the 20V heads where the most ideal but I have my doubts as I would take a non edducted guess and say the supercharger itself is the biggest limitter of power.

[PRIMRK]

i was looking at twin charging to allow high end power using a simular set up to the VW golf TSI, but this was a massive job to undertake so ill stick to supercharger with a smaller pulley cos im not a fan of lag.

ive found some people say that the best forced induction head is the silver top 20v

[Sam-Q]

I think you will struggle to find the difference between the 20V engines. If you want response go for about a 10:1 compression ratio and a T25 turbo with that 7A bottom end, I think you will be shocked.

[topher]

There was a post about this on twincam.info last year i believe. I'll try and find it as it had some interesting information in it.

[blake.]

lol i were for vw and you'll find all cav type 118kw tsi twinchargers are frying pistons, and are getting de-tuned for less instant torque.

i say go turbo, i heard that a wrx turbo doesnt give much lage on a 4age?

[PRIMRK]

anyway forced induction methods aside what head works the best in the 1.8lt application?

[Twinky]

Just a dump of someone in NZ with this setup.

Engine:
7AFE Block and Crank
7afe crank, polished,balanced doweled for the flywheel
7afe standard alloy sump
20v Black Top Head and cams
Supertech valve springs
TRD 0.8mm Head Gasket
Ross Racing 8.0:1 pistons
Saenz H beam Billet Rods with Aircraft Spec ARP bolts custom made
ARP head and main studs

Electrics:
Autronic SMC
Evo Coil packs
Evo Module
Evo Optical Distributor
Gizzmo Launch controller

Fuel:
SARD 800cc injectors
TRE intank lift pump
Custom Alloy Surge Tank
Bosch 044 External pump
Upgraded Braded teflon fuel lines through out whole car
Aeromotive Fuel Pressure Regulator
Big mexh style fuel filters

Driveline:
Quarter Master twin plate rally pack clutch
Custom billet steel flywheel
4agze gear box with a mixture of aw11 s/c and ae92 s/c ratios with some trick mods and a TRD plate lsd

Intake:
20v quad throttle bodies
Custom Intake Plenum
2.5" Intercooler piping

Exhaust:
Custom Steam Pipe Twin Port Manifolds
T3/4 500hp Turbo
2x 38mm Tial External Wastegates
3" Downpipe
Full 3" stainless system with a cannon muffler

Cooling:
HDi GT2 spec intercooler
External Oil filter kit with 2x Setrab Oil Cooler
Pushlok Oil lines
Audi A4 alloy radiator 600x300x50

Suspension:
Custom Bazda spec Coilovers with full camber adjustment and 30 way damper adjustment
Standard Sway bars

Brakes:
Front
Wilwood Superlite calipers
Custom MRP (bazda spec) adapters
Celica GT4 ST205 discs 315x32

Rear:
AE101 rear disc and calipers
Bendix Ultimate pads

Wheels:
17x7" Enkei RPO1's with Dunlop DZ101's for the looks
16x7" Rota Circuit 10s with Toyo R888 semi slicks for the circuit
15x7" with M&H for the drag strip

Performance:
337.5kw atw on 26psi
10.88@209357kph 1/4 mile
1.04.8s Pukekohe Park Raceway
1.16.89 Taupo Track 2 (tightened up version)
1.44 Taupo Track 1 (Brakes were shot, car handling like a piece back then, good for 1.41s when I get back to that track)

At present car has no engine. Blew a piston last track day due to electronic boost controller spiking over 30psi.
Currently rebuilding engine.
Suspension Roll Centre mods on the cards.


Also if you can access the site without login here is the link to his members rides thread





If you want just sighn up to the forums and have a chat with Barry as I am sure he would be more than happy to help as well as provide custom fabrication and parts.

[lolwat]

be different and twin charge it if you have the time and money, as if it is done correctly the touque and how it will deliver the power will be amazing