kikiturbo

from what I have seen on the few e9 I work on, one of which is equipped with 7460 kai (similar size to 71hta) you will be at least 50 - 70 hp short on the stock injectors, assuming you run 11 - 11.5 AFR on pump..

WRC-LVR

iTrader: (1)

James Emmino at EBTEC did call the order in to FP. I dont think they sell it any more separate. Doesnt matter...the Forge one has shipped just waiting on delivery.

The Forge VIII WGA I have had since 2008 and it has never had any issues. FTW !

Rest of the car is back together...Hopefully we can get it finished and tuned this Saturday.

WRC-LVR

iTrader: (1)

Tuning will tell. Goal is 23 psi max.

DatFast1

Keep usending updated please.
Running the fp 71hta on my evo 9 also.
Wanting to see. What's it's capabilities are

marrrk

iTrader: (2)

I had one of these little guys installed about four months ago or so. nice bang for the buck I guess, ive gone thru 2 greens, (old style) about 9 years ago, then a red, got a lot of miles on that one, was a j/b and went tens and then another red-bb had a bad boost leak at the track and fryed it then sent it in and had them make it into a bb-black. but while it was being built I fried my clutch, so I sold the black to get a new clutch and never put it on. every time I was in between turbos I would put a stock 9 turbo back on, so now I have the 71 in now and have another 9 turbo spare just in case. the 71 made 380hp 360 tq on boostins md at 27psi should be good for low 11s very fun turbo to have for in between decision making process for next turbo. car is going in shop time for another trans rebuild, fried it 2 months after the 71 was installed... guess I was having too much fun but that trans lasted about 60,000 miles.
cant wait for your results G/L
sorry for the off topic long read

WRC-LVR

iTrader: (1)

We are not trying to have it push lots of power at all. Max 23 psi. If we start running out of injector, then we will lower the boost to 21 psi. It is an MR 6 spd with 101K on it. My goal is 320 or so to the wheels. I want it fun but safe and reliable. Remember it was a Evo 8 MR turbo 10.5 hotside. And it is my daily driver.

WRC-LVR

iTrader: (1)

Here is a nice little calculator from from RC Engineering: https://www.rceng.com/technical.aspx

Results below for 320 and 340 hp at up to 95% IDC

Fuel Injector Worksheet

Actual Desired Crankshaft Horsepower


320
B.H.P.

Number of (same size) injectors to be used


4

Brake Specific Fuel Consumption desired
* See note below.


0.60

Maximum Injector Duty Cycle you will see
Warning: Duty cycle should not exceed 80% (0.80) for these calculations.


0.90

System fuel pressure @ fuel rail


43.5
PSIG

(Static flow) injector required @ test PSI of 43.5

53.64
Lbs/Hr
564
CC/Min

Press to Calculate Static Flow

* Brake specific should be .45 to .50 for naturally aspirated engines,
.55 TO .60 for supercharged engines,
and .60 to .65 for turbocharged engines.

And at 95% IDC

Fuel Injector Worksheet

Actual Desired Crankshaft Horsepower


340
B.H.P.

Number of (same size) injectors to be used


4

Brake Specific Fuel Consumption desired
* See note below.


0.60

Maximum Injector Duty Cycle you will see
Warning: Duty cycle should not exceed 80% (0.80) for these calculations.


0.95

System fuel pressure @ fuel rail


43.5
PSIG

(Static flow) injector required @ test PSI of 43.5

54
Lbs/Hr
567
CC/Min

Press to Calculate Static Flow

* Brake specific should be .45 to .50 for naturally aspirated engines,
.55 TO .60 for supercharged engines,
and .60 to .65 for turbocharged engines.

kikiturbo

these are @crank numbers... you are looking for @wheels... which is at least 22% more.. so you are looking for about 400-410 hp at the crank... which should be doable with stock injectors but right on the limit..

redSLed

I'd grab some 1000cc injectors for the headroom. Sure, you could likely make 330 whp with stock or 1000cc injectors but you'd obviously have much more headroom, safety margin with the larger injectors. That turbo isn't even beginning to break a sweat at 21-23 psi. 320 whp is stock turbo territory on pump fuel! You'll have great response with the 71 hta at least with much more top end than factory.

LCS

iTrader: (9)

I'm using 1000cc RC Eng injectors with a HKS 7460R, Kelford 272 cams and Deatshwerks 300 fuelpump. Stock rail and FPR. 9mm fuel feed line, not the stock one.

making close to 400whp and injectors DC never go past 68% IIRC.

idle is great. Up top it is tuned a little rich to cool things down.

better safe than sorry.

awhit17

iTrader: (6)

At a flat 23psi, I made 400whp/355wtq on a 71hta, on pump gas. I would suggest moving to larger injectors or sticking with a stock turbo if you want 320whp.

211Ratsbud

iTrader: (1)

Or.. you guys had significantly different dyno conditions.

16* up top with s2's wasn't over 350 whp on a mustang dyno in my personal experience

awhit17

iTrader: (6)

I'm unsure what you're talking about, I don't have those cams, my last tune did not have that much timing, and my car was run on a dyno that reads basically like a jet.

I'm saying the OP may want to stick with a stock turbo with his desire to make 320hp and use stock injectors.

redSLed

Agreed. I'm around 11:1 maybe 10.9:1 out the top with FIC 950's, logging around 85% idc peak. I'm on 93 pump fuel and made 440 whp 370 tq on a DJ. Boost ranged from 27.5 ish down to 26 out the top.

I too have great fuel mileage, driveability and idle quality with bigger injectors.

The OP stated a desire not to run large injectors because he valued fuel mileage and driveability as well as the potential ability to cool combustion.

Fuel mileage, driveability and ability to cool combustion aren't necessary features of larger injectors. Your tune above all else manages fuel mileage and driveability. Larger injectors don't cool combustion temps per se. Adding more fuel regardless of injector size can have a 'cooling' effect to some degree but too much and you're in diminished returns area. Road racers seem to prefer richer mixtures under wot.

Methanol injection helps cool combustion temp, alternate fuels aid in combustion temps. Aftermarket injectors may have different spray patterns which may provide better atomization but I can't comment as to whether that would lead to cooler combustion temps.

awhit17

iTrader: (6)

True. I bet a nice set of modern injectors would probably have better atomization and therefore maybe even slightly better economy potential vs. the stockers.