Project 20gze

[spraycanmansam]

Hi guys this is the run-down of where I'm at at the moment

 

What I have:

 

Early model silver top 20 valve 4A-GE engine, gearbox, ecu.

SC12 supercharger (I'm unsure which pulley size it has on it)

 

 

This is what I'm thinking of getting/doing:

 

Head work:

Port match manifolds

Mild port and clean up of head, remove any hotspots etc.

1JZ 380cc? injectors

 

Bottom end:

Arias 9.0:1 oversize forged and ceramic coated 20v pistons (has valve cut-outs)

Shot-peened 20v rods

ARP bolts for EVERYTHING!

 

Theres other stuff I can't remember at the moment but anyways...

 

 

I only plan to run around 8-9psi max. The main aim of this project is to build an engine that feels refined and torquey. Keeping that in mind, I am unsure of what ECU to use because i would REALLY like to keep all the good factory ECU stuff like cold start, etc. I need to find a system thats capable of controling everything like the VVT, supercharger on/off (based on vacuum rather than RPM), upgraded injectors, water injection setup, etc. I really need to know if any of you guys out there have any opinions on what system would be able to handle these major things. Theres too many out there and I really just don't know and would rather take it from the experience of others.... Cheers guys!

[NickZ]

sorry to spoil your fun, but the sc12 will not be able to supply enough air flow for the 20V engine.

ive seen one done and anything above 5500rpm the power just drops off.

[spraycanmansam]

sorry to spoil your fun, but the sc12 will not be able to supply enough air flow for the 20V engine.

ive seen one done and anything above 5500rpm the power just drops off.

 

When you say 'drop off' at 5500RPM, your saying that the supercharger can't make any more power (pump more air) after those RPM's..? :hmm: :D

I'm wondering whether the power curve would continue like a normal 20v after the charger puffs out..? :hmm:

 

Like i said I'm after the grunt more down low (so it feels like it has a bigger, torquier? engine in it) than all-out power.

 

The only reason i take my engine past 5500RPM is to get the p.o.s moving! I wouldnt need to rev it so hard with the torque of the charger.. :yes:

[anastasios]

well theres no point putting a silvertop in it because then your not using the whole rev range of the motor and its a waste

Edited March 19, 2007 by anastasios

[spraycanmansam]

well theres no point putting a silvertop in it because then your not using the whole rev range of the motor and its a waste

 

 

imho there is..

 

- it has a p.o.s 4A-C in atm so ANYTHING's better =P

- i couldnt find a 16v 4AGE at the time

- later model engine

- pretty much same strong internals as some model GZE's (with different pistons)

- quad throttles (better response)

 

BTW i can't believe i forgot to mention that along with the refined, torque part, I'm also after awesome throttle response, hence the use of a supercharger rather than turbo... :D

[spraycanmansam]

I just found this lil snippet from another forum from a person who has done a similar conversion...

 

...I believe a 20vgze to be a great all round engine,it makes great tq at a very low rpm and still screams to 8k.The nasty gze intake manifold and piping are the reason they fall flat on the top end.

 

I guess ill put it all together and see what she goes like...

[Sam_Q]

do arp sell head studs for a 20v? if so who sells them any idea?

Edited April 10, 2007 by Sam_Q

[Raven]

Why not use an SC14 instead?

[spraycanmansam]

I would've used an SC14, but it was more convenient for me to jus go and buy the SC12 off my uncle.. :D

[NickZ]

When i say power drops off it like hitting a brick wall, you have to change gears. the SC12 will never move enough air. No it wont give you the normal power curve after the blower drops off at there isnt enough air.

 

I can't see the problem just using the 20V as it is, youll be making 3x the power of the 4ac and the lower torque would still be more than the 4ac.

[anastasios]

exactly just rev the motor harder and keep it in the power band

[spraycanmansam]

exactly just rev the motor harder and keep it in the power band

I don't want to have to rev it harder to keep it in the power band! i want the power band lower in the rev range...

 

 

I can't see the problem just using the 20V as it is, youll be making 3x the power of the 4ac and the lower torque would still be more than the 4ac.

 

Yeah i know, the prepped 20v will be going in first, then getting complianced, etc. Then I'm going to look into what i have to do to make all my plans legal.

 

 

When i say power drops off it like hitting a brick wall, you have to change gears. the SC12 will never move enough air. No it wont give you the normal power curve after the blower drops off at there isnt enough air.

 

Well what do you make of my previous quote of the owner of a similar engine? Perhaps its all in the setup? i.e: piping diameter/length, manifold design...

[Raven]

Just go turbo. Easier and you don't have to use power to make power :D

[spraycanmansam]

Just go turbo. Easier and you don't have to use power to make power :hmm:

 

Easier maybe, been done a million times, yes.

I know about the power loss too which is why i want to run around 8-9 psi which willl give similar results as a turbo running 5 psi.

 

With the supercharger i can just hang it off the side with the stock lower bracket, make a custom top one, and then just run piping.

With a turbo - custom exhaust manifold...

manifold or bracket.... hmmm? :D

 

and if i went turbo, me being me, id go and buy a brand new one! around $1250 or 1/4 that for a supercharger? :yes:

[Jono]

Easier maybe, been done a million times, yes.

 

why is that a problem? you are aware that trying to be "different" in the worlds best selling car is a bit of an oxymoron?

any reason you don't like to rev? i'm sure you'd find the 20v has sufficient grunt in an ae82, if not, i've heard 626 turbos hunt gutters pretty well.