Benjamin

I'm curious what is the biggest turbo I can upgrade to without a) having to upgrade the stock fuel lines and pressure regulator, and b) with my 1300cc injectors. Would the GT35/40 be too big?

Please stick to the common RX7 turbos--one of those will most likely be purchased, for servicing reasons. thanks in advance,

-BN

lane_change

iTrader: (20)

The GT35/40 would be a waste with such small injectors. You are running stock 550's as well right? I would at least switch out to 1600cc secondaries and get a 1:1 FPR.

What are your goals for it? If you stay down around 10-12psi then the 1300's should work, but why go single and run such low boost. You don't need new lines, I would, but they are about a -6 line factory, but I would recomend a larger pump, larger injectors, and a FPR at the least.

Maybe an XS T04S or T04E would work, or an Apex'i RX6 with your setup, I would spend the extra change and upgrade your fuel system anyways to be safe.

Good Luck Ben.

Benjamin

I don't understand why it would be a waste. I could run lower boost, still be well over 400hp, and make it work with my present system. anyone care to elaborate on why running 12-14lb and still making over 400 would be bad?

-BN

Resource

Ben.......I told you the deal tonight when you were at the shop. You can achieve 500rwhp with 1300cc injectors. We'll set you up with either our BSC GT 35/40 w/1.06 housing Turbo kit or our BSC T04S Turbo Kit.

Mr rx-7 tt

iTrader: (5)

BINGO! I tell this to people all the time. You CAN get 500 RWHP out of 550's and 1300's.

t-von

iTrader: (8)

Since we are on this subject, would you guys happen to know what combination is good for 650 max rwhp on a ported 20b? I was thinking of using 850 prims and 1300 secondaries.

Benjamin

Dude--I know nothing about the 20b, sorry.


Eric--I believe you, but I told scott that, and he replied, "and how many motors has Eric gone through?" or something to that effect.

-BN

wonder1and

Hey cyberben... kinda my $.02 is that your can get 425 to the wheels off of a T04S @ 14lbs on a streetport w/ a FMIC. I was in the mid-low 80% range on my injectors... problem w/ the injectors that is worth looking at is I found that one of them originally was sticking open when I first put it in... which can be a common occcurance... untill it sticks shut then pop! I suggest a upgraded fuel system... 550s/850s in front and 1600's backing them up... I got my 1600's and rail from keith's rails for 300 + a FPR for another 100... lines will be an additional 30 bucks. Just so you can see what it is worth to prevent popping a motor that will cost 1000+ usually to fix if you don't do it yoursself. (search for keiths rails and he will get you setup if you want) Just tell him Ryker sent you.
-Ryker

Resource

Do the math.

Fishy

Ryker, where did you get the FPR for $100? I am in need of one.

Thanks
Dan

wonder1and

Forum sale... gotta keep your eyes peeled!

GoodfellaFD3S

iTrader: (213)

Take a peak at Max's fuel calculator:

http://www.maxcooper.com/rx7/how-to/...tem/calcs.html

550s/1300s at 85% inj duty, 381 rwhp
850s/1300s at 85% inj duty, 444 rwhp

this is at stock fuel pressure, though. When it comes to injectors, I didn't want to mess around, so went with the 850s/1300s......

Jason

iTrader: (5)

Good Point.
1300's will not support 500 RWHP.

Benjamin

OK--now that we've done the math, back to the original question....

What's the biggest turbo, or turbo that would be most tunable and all-around most effective with 850/1300cc injectors? (again, with stock fuel rails/lines/denso comp pump)

thanks,

-BN

Resource

Actual desired crankshaft horsepower 600 B.H.P

Number of same sized injectors to be used (4)

Brake specific fuel consumption desired (.60)

Maximum injector duty cycle you will see (85%)

System fuel pressure at base idle (50psi)


Required injectors for 600 B.H.P (4-1038 CC)

2- 1300cc injectors + 2- 850cc injectors = 4300cc/4=1075cc

That's what you need for 600 HP at the crank.

Mr rx-7 tt

iTrader: (5)

Seen it done...