Are 440 injectors enough for Stage2 turbo?

[Keeper818]

This is a question i can't answer myself.
I have GT with C2Power Stage 1 turbokit Garrett GT28R, 380cc injectors, 255l fuel pump.
Want to get all the parts for stage 2 setup and already have:

Wiseco 9.0 pistons
Pauter rods
Supertech valves
Crower valve springs
Crover Stage2 cams

Looking for injectors and was thinking to get 550cc but there is one guy saying that 440 in enaugh for 350hp is that true??

Help me guys!

[Smaay]

not for what you are going for, i suggest either a return system or 750cc injectors

[Jesse IL]

550cc at the smallest

[Keeper818]

not for what you are going for, i suggest either a return system or 750cc injectors

Smaay so you saying that will be enaugh 440 but then i need fuel return system with fuel pressure regulator isn't?
I want to get maximum from my motor so you think without return sytem i need 770?

[jlitman]

See here
http://www.newcelica.org/forums/showthread.php?t=190656

and here
http://www.rceng.com/technical.aspx

Remember to deduct boost pressure from fuel pressure -- see the first link for example.

I'd go a little bit larger (but not substantially larger) than whatever you arrive at in the calculator to play it safe, but this should get you in the ball park.

For example, if we assume ~49 psi at the rail, BSFC of .6 and crank hp (not wheel...) of 350, you're gonna need at least 650's (these numbers may be a bit off -- I don't know how much boost you will be running...).

So if your values are close to my estimates, something between 650 and 750 cc's should work.

[Keeper818]

See here
http://www.newcelica.org/forums/showthread.php?t=190656

and here
http://www.rceng.com/technical.aspx

Remember to deduct boost pressure from fuel pressure -- see the first link for example.

I'd go a little bit larger (but not substantially larger) than whatever you arrive at in the calculator to play it safe, but this should get you in the ball park.

For example, if we assume ~49 psi at the rail, BSFC of .6 and crank hp (not wheel...) of 350, you're gonna need at least 650's (these numbers may be a bit off -- I don't know how much boost you will be running...).

So if your values are close to my estimates, something between 650 and 750 cc's should work.

Very usefull links jlitman!

I calculate that for 350hp i need at least 689cc so probably 750 will be ideal??

[Smaay]

yes, if you are just going with injectors, if you convert to a return system then your 440's might be pleanty.

to put things into perspective, when i made 350HP on my GT35R with 750cc injectors on a walboro pump i was maxing out my injectors. when i converted to the return fuel system that injector duty dropped to 46% now my injectors max out at 550HP

[Keeper818]

Thanks a lot guys for usefull info!

[Keeper818]

Also just curious - will be enaugh my gt28r turbocharger for 350hp goal?

[jlitman]

Also just curious - will be enaugh my gt28r turbocharger for 350hp goal?
Wheel, I don't think so...

In any case those are pretty big numbers with the stock 1ZZ or 2ZZ. 1ZZ could break a rod and 2ZZ might chip a piston.

[Keeper818]

Wheel, I don't think so...

In any case those are pretty big numbers with the stock 1ZZ or 2ZZ. 1ZZ could break a rod and 2ZZ might chip a piston.

I'm not saying that with stock 1zz, am going to put stage 2 cams, valves, valve springs, pistons, rods and 650-750cc injectors. The question is: does Garrett GT28R will capable for 350hp?

[Jesse IL]

Wait a second, what the fvck does "Stage 2" mean?
The question is: does Garrett GT28R will capable for 350hp?
You might squeeze 250 out of that turbo, it's just a little guy. For a GT to put down 350 to the wheels, you'd need at least a 56 trim GT2871R.

For 350 whp, you'll need 750cc injectors without a return fuel system and 630cc with. With a return system, you won't max out 750's until 550 whp.

[Keeper818]

Thanks Jesse IL,
F**k! Then i need bigger turbo :( How much is GT2871R cost approx? and does the downpipe and exhaust manifold do not needs to be modified stepping from GT28R to GT2871R?

[Avendit]

watch the crank/wheel HP difference here! Keeper - you talking about 350 at the wheel or the crank? Just the guys in the US assume wheel, where in the UK people assume crank. Take drive train losses of 20% and 350 at the crank is 280 at the wheels - which is within, although at the top of the C2 supplied turbo.

Apply the same adjustments to the injector discussion above, unless the typest has specified WHP or crank HP.

Its annoying, and WHP is probably the most sensible, but hardly any one in the UK uses it (not so sure about IRL??), and crank HP iiisss a bigger number ;). Just something to bear in mind.

Avendit

[monkeywrench]

The 28R will make about 320whp at its very limit. 550's are good for 300whp on a good day, 630's are good for close to 350whp. I'd do 630's so you don't have more turbo than fuel.

350 crank hp is around 305whp with the Celica's ~13% drivetrain loss.

[Avendit]

ta MWR, proper sums appreciated :D

and can I just say - biiiiig intercooler if you stick with the 28R at that power!