umi415

I am want to run 15 psi on my 7 and I'm not sure what injector size to buy for the secondaries (550cc x 4 current set up). Here is a list of the mods:

fresh rebuild ( still on break in) street port
t04 .60ar cold side / .96 hot side (not installed yet)
40mm wastegate (not installed yet)
fmic 28 x 10 x 3 (not installed yet)
walbro fp
fpr
custom 3" TID
3" downpie / 2 1/2" after Y / racing beat mufflers
rtek 1.7 (not installed yet v1.5 on at the moment)
SAFC-2

Other mods
4.30 rear diff. (not installed yet)
act hd plate w/ cc 4 puk bronze plate
hks blow off
manual rack
a/c taken off
auto meter gauges
greddy turbo timer
no air pump
20b alt w/ dual pulley
can't remember any others

I plan to use the rtek v 1.7 since I already have v1.5 and spent most of my cash on the rebuild. I plan to buy a EMS when I save some money. Please give me your advise I dont whant to buy a injector that is to small for my goals or to big for that matter.

Thanks for your help,

JP

PS> I searched,
O its a 87 TII

umi415

correct me if I am wrong but on the 1.7 you can't put an injector smaller than 720cc, it doesn't say you can't go with larger ones like 850cc or so on

umi415

thanks C freak for your input

umi415

sure man Ill let you know how it goes

Rx7Ridah

iTrader: (8)

i am going to suggest a wideband also, its going to be crucial. with the larger turbo and injector/fuel pump you are going to need to tune with the safc. i am running a slightly similar (t04, 550 prim, 720 sec, walbro, safc, 1.5 rtek, 3in intake, 3in turbo back, mazdaspeed clutch, safc, and wideband) and it ran really rich.

umi415

^^at what boost are you running your setup?

jkimbro

iTrader: (3)

http://rx7.com/cgi-local/2ndgencalc.cgi

Very helpful link

umi415

Thanks for shearing, great link. So 850cc sec. sound about right for my goals?

umi415

is someone running a similar set up like what I plan to put together and can tell me what injectors they are using. I dont want to blow a fresh rebuild!

prjct87rx7

iTrader: (7)

you can use 550 on the primarys with the rtek 1.7 just have to use 720cc plus on the secondaries

RETed

This is the problem...
We have no idea what kind of turbo this is.
"t04" is a Garrett family of turbos.
They are divided into basically the T04B and T04E sub families.
Within those sub families, there are a multitude of models.
T04B -> S-trim, V-trim, H-trim
T04E -> "46", "50", "57", "60"
Those are not even all the models available...just some of the more popular ones.

Now, we're talking about turbos that will blow enough air to produce anywhere from 200hp to 400hp at the wheels.
That's a large span!

Your fuel injectors can support 230 to 240 at the wheels safely.
This is the stock 4 x 550's.

If we're talking 400hp at the wheels, you'd need 1600's in the secondaries to have enough fuel.
850 secondaries are definitely not enough, and 1000's I would not feel safe with.

So...do you know which turbo you are running?


-Ted

umi415

unfortunately no, I don't no what sub family it is since I bought it from a local who had purchased it for his fc but ran out of money to finish his project. I will try to find out and thanks for the advise I really appreciate it.

RETed

Do you know what the O.D. of the compressor inlet?
If it's 4", it's a TS04 cover, and it's most likely a T04E turbo.
If it's 3", it's a T04B.

Also, if you have a pair of dial calipers handy, you can try and measure the compressor wheel minor diameter.
Check my chart...
http://fc3spro.com/TECH/TURBO/tmodels.html


-Ted

umi415

I am at work right now so I cant measure it. But its definetly not 4" on the inlet. I search on the internet and found out some info from the supplier. It says xs power on the tubine I had never heard of it but for $250 new never used I thought it was a bargain. Anyway it says on the net its a .62 trim and stage v. I have no clue what this means. Also the turbo came with a 1.15ar compresor that I changed to a airsearch q trim .96. hope this helps with identifing what I have.

J-Rat

iTrader: (2)

I can attest that with 720 primaries and 890 secondaries, at 401 HP, my IDCs were 99%. NOT SAFE..

umi415

what is IDC?

J-Rat

iTrader: (2)

Injector Duty Cycle.

umi415

so what would you recomend?

J-Rat

iTrader: (2)

If you want to go over 400, might as well sack up and get 1600 secondaries.

umi415

will a combination of the rtek 1.7 and SAFC-2 be able to tune with 1600cc sec

J-Rat

iTrader: (2)

Doubtful.. I dont trust the SAFC as far as I could throw it though..

RETed

Yep.
Do a search on "xs power" or "xs-power", and you'll get a lot of hits.

I don't either, cause these dumbasses like to make up their own names for their parts.
It does not correspond to Garrett naming conventions.

That doesn't make any sense, since "q trim" implies turbine wheel, but you mention "compressor".

Sorry, but I'm not a big fan of those XS-Power turbos, so I can't tell you what kinda power it'll make.
You can try and measure the compressor major and minor wheel diameters and see where it falls on the chart?


-Ted

umi415

Thanks for your help I'll see what happens. Ted you are correct about the q trim I guess I miss undurstood the guy