legacycentral bbs

heya,

just checking a few things

EJ20G

first my mods are

TD05h 16g
early Sti yellows
apexi safc untuned
HDI Front Mount Intercooler
Coffee Cup mod
pod filter


i ran the car on wastegate boost and the boost gauge reading from the intake manifold and it reads 0.4bar or 6psi

does that sound about right?

Wastegate actuator's are set to various pressure settings per vehicle manufacturer specs. The VF11's (and apparently your TD05) generally open around 6 to 6.5 psi. They open lower than the pressure setting of the boost control solenoid (via the ECU) because you want them to snap open quickly at the desired boost level. At 6 they are just starting to open, but if you hold the pressure back till it builds to 8 they open faster and more completely.

GD

ok thank you also
with my mods what kind of boost would it be able to run ?

If those injectors are 440's, you'll most likely end up limited by your injectors. What boost that is, can only really be found by tuning it, keeping an eye on your injector duty cycles, among other things. The 22T heads and intake seems to cause the motor to have a pretty bad BSFC (brake specific fuel consumption) which in turn makes you need more fuel for a particular power level. I was only getting about 300whp out of my 650cc injectors, and that was at a 60psi base fuel pressure. I should have been at a bit higher BSFC than stock with the fairly hot Delta cams I was running in those heads.

gtlegacy wrote:with my mods what kind of boost would it be able to run ?

There's just too many variables to tell. You need to tune the car to the components you are using. It depends on a LOT more things than you have listed. You will need to record important metrics as you increase boost such as the injector duty cycle and the watch for the MAF sensor to max out. You also have to watch EGT's and fuel mixture with a wideband to insure you aren't running too lean or too hot, etc.

All the bolt-on, go-fast parts are nice, but they are worthless without quite a few tuning tools to use them safely.

GD

Yup. Gone are the days of slapping parts on a car and calling it good.

yea ok so i really needa just keep it simple around 10 or 12psi
im not to serious bout high boost at the moment

its an ej20g btw

i will find a cheap link or maybe a megasquirt

what are th megasquirts like ?

gtlegacy wrote:what are th megasquirts like ?

They aren't the ideal option unless you have a background in programming and electronics. They can do anything you could want pretty much, but you might have to modify a circuit or create a new sub-routine to make it happen. The learning curve is too high for most people that don't have the technical background.

MS also has no safety's against causing real harm to your engine. It will do whatever you ask of it - it's complicated and easy to make a mistake that could be very costly.

Now I haven't installed one yet personally, but I have researched it quite a bit and I'm going to do my first install on my SPFI powered EA81. Best to start simple and with an engine that isn't likely to be harmed with improper settings.

GD

ok so best go with a link

If you are looking at the either of the G4's, you are going to need a wideband to use the Autotune feature. When messing with something as in depth as a standalone, you need the proper tools like a wideband, among other things. Just take that into account when you try to budget for it.

Here are a few poplular suggestions to look into for engine management:
Perfect Power 6 (decent one to suggest & my future piggyback EM)
Link Engine Management (little harder to find since the company is located in NZ)
TurboXS Dtec (will work to a point but has its limitations)
The only draw back with the Dtec is that it will not control timing for you. On the OBDI cars, this is a big deal. OBDII cars are much easier to reflash with hand held programmers. Of course the two are completely different engine computers.

The Yellow Sidefeeds from a EJ20K or EJ20R should be 480's.

My 16G runs about 8psi on the actuator, while my VF11 ran 5psi on the actuator.

i might just run 10psi for now i have a chipped ecu and maybe just get the safc tuned