Project 20GZE - Toyota Nation Forum : Toyota Car and Truck Forums

spraycanmansam · 03-19-2007, 06:31 AM

Hi guys this is the run-down of where im at at the moment

This is what I have:

Early model silver top 20 valve 4A-GE engine, gearbox, ecu.
SC12 supercharger (im 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 cant 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 dont know and would rather take it from the experience of others....

Cheers guys!

CRASHDRIVE · 03-19-2007, 09:42 PM

very nice project man but why not turbo charge it less fab work just my 2 cents

CRASHDRIVE · 03-19-2007, 09:43 PM

very nice project man but why not turbo charge it less fab work just my 2 cents

spraycanmansam · 03-20-2007, 12:47 AM

less fab work? i suppose its how you set it up i guess...

my sc setup is going like so:

sc12 supercharger running 8-ish psi into a PWR water to air intercooler going into the inlet manifold.

basically hang the supercharger off the side and run a few pipes...

and yes i know its more complicated...
if i turbo'd it i'd have to get a custom exhaust manifold made up as well... it is still an option tho..

I want to keep the throttle response of the engine, hence the pd supercharger and shorter intake lenghts of water to air intercooler.

eage8 · 03-20-2007, 11:01 AM

look into megasquirt ECUs.

they're open source and they're evolving into a really really nice ecu for a really decent price. one of the guys who writes code for it has a 20v AE86 too.

I'm running on in my RX-7 and it's great.

http://megasquirt.info/
http://msefi.com/

that being said, I think for the torqueyness your looking for your probably better off getting a roots type supercharger. a centerfugal is the oposite of what you want it'll produce all it's power at the top end and a turbo will always have lag, especially on a fairly small engine.

forpinks · 03-20-2007, 11:41 AM

What car are you gonna put it in dude?

I'd say computer controlled turbo for fuel economy considering gas is over 3bucks now... but S/C would be a good drifter engine...

eage8 · 03-20-2007, 12:21 PM

you don't biuld an engine like that so you can get good fuel economy :-P and even with a supercharger he's going to get better fuel economy than most. especially if he goes standalone ECU.

I'm assuming it's going to be in an AE92 because he's using the 20v tranny (FWD). but it could be something newer

micro214_kp61 · 03-20-2007, 08:19 PM

you're doing all that internal work for 8-9 psi boost? you can run that on stock internals, minus high comp pistons replace with GZE with 5 flycuts and get it tuned properly. spend the money on full standalone, ie. MegaSquirt.

if you're doing all that work go with the turbo so you can get more power later also i'd shoot around 14psi to make time worth while.

spraycanmansam · 03-21-2007, 03:46 AM

Quote:

your probably better off getting a roots type supercharger

Yep SC12 is roots..

Quote:

I'm assuming it's going to be in an AE92 because he's using the 20v tranny (FWD). but it could be something newer

I have an AE82 at the moment, but im looking into an AW11 MR2... (less power loss through drivetrain than FR, mid mounted, bla bla)
I want something fairly light

Quote:

I'd say computer controlled turbo for fuel economy considering gas is over 3bucks now...

Fuel enconomy will be pretty good because of the way im planning to set it up (charger on/off controlled by manifold vacuum rather than certain RPM point)

Holy crap man $3!! Where you from? Petrol prices have skyrocketed over her and they're still only round $1.30 for 98 oct

Quote:

you're doing all that internal work for 8-9 psi boost? you can run that on stock internals, minus high comp pistons replace with GZE with 5 flycuts and get it tuned properly. spend the money on full standalone, ie. MegaSquirt.

I'm giving myself plenty of headroom.. plenty. I can get the Arias for a few hundred more than the GZE's so i think its worth it, and i dont wan2 add flycuts to pistons because it weakens them.

Ill have to have a look at the Megasquirt, sounds pretty good!

micro214_kp61 · 03-21-2007, 06:48 AM

Quote:

Originally Posted by spraycanmansam

I'm giving myself plenty of headroom.. plenty. I can get the Arias for a few hundred more than the GZE's so i think its worth it, and i dont wan2 add flycuts to pistons because it weakens them.

Ill have to have a look at the Megasquirt, sounds pretty good!

i didn't realize that the Arias is only a couple of hundreds more, but those are well made pistons. you can always get the GZE pistons coated after cutting it but it's worth just buying the Arias.

if you're into electrical stuff go with MegaSquirt but if you're not buy a HALTEC and just get it tuned.

spraycanmansam · 03-21-2007, 11:21 AM

Yeah i can get the arias 4 around 750, not 2 bad.

One thing that sum ppl r saying is that the supercharger wont be able 2 flow enuf air above 5500ish rpm. Theyre makin a big deal that it just wont b able to keep up with the 20v. It seems 2 do fine on the bigport version, which many think flows more... Thoughts anyone?

eage8 · 03-21-2007, 12:08 PM

the big port version probably flows slower, the velocity of the intake is probably greater in the small port which might be the reason it can't keep up.

I don't know, it's a theory though.

rezzle · 03-21-2007, 12:21 PM

Either megasquirt - which has fuel control only.
Or you can look into simple digital systems www.sdsefi.com I used to know the fellow who owns sds. Cool guy and a toyota nut - he has built some monsters, and his fab work is amazing, seach that website to see how he built up his kit plane

EverAE · 03-21-2007, 02:33 PM

s/t ae82

lol since you already gotta fab up the s/c equipment you could try fitting a sc14 instead of the 12, you'll have some lag but more uptop for sure...might as well go arias like you said considering the pirce difference.

lol and i just noticed the whole gas price thing, on a side note, the 3$ was gallons and 1.30$ was litres i'm asssuming...

eage8 · 03-21-2007, 02:48 PM

Quote:

Originally Posted by rezzle

Either megasquirt - which has fuel control only.
Or you can look into simple digital systems www.sdsefi.com I used to know the fellow who owns sds. Cool guy and a toyota nut - he has built some monsters, and his fab work is amazing, seach that website to see how he built up his kit plane

megasquirt has fuel and spark. it has for a while. I'm running spark through it fine on my RX-7 and so is my friend with an AE86.

learn about what you're talking about