oh ya if your running stock injectors and can get your duty to 85% thats enough fuel for supposedly 270flywheel hp so my guess was pretty close

 

Thats a good reason to have your stock ecu reprogrammed, well as long as you never plan on going full standalone EMS. Or at least not for a while.

 

Wow, I might even be willing to drive one of those road-going Maytag-looking A/Es if it had that kind of power!

 

Honestly, I know nothing about your ECU's, BUT... JUST from reading that quote, it seems as though they're saying a stock ECU pumps out 58-63% duty STOCK. That doesn't mean that it's limiting the injectors too! You better paste some articles, or re-read everything you've ever read, because I'm getting pretty sceptical. I don't want to rely on the math either, as rotaries are different than pistons, so it wouldn't be fair to use a piston formula on a rotary. Though it may work, I woudln't use that as a basis for my argument.

Basically, if I had to guess, I'd say a normal ECU would NOT cut out injectors at any duty cycle because it's safer for the engine to have the fuel, rather than starve it trying to protect the injectors. I'm pretty sure Sandor is maxing out his injectors...

Boris

P.S. The only one allowed to ****-talk in here is ME!

 

the fd ecu drives its injectors to over 90%, and it seems like the t2's do also. has anyone done actual testing?

http://www.newwave.net/~flanham/wlan.../3modrule.html

mike

 

last I checked the t2 computer will let the secondaries reach a duty cycle or 80 or 85 percent. However the primary injectors are limited to a much lower duty cycle from the computer, I want to say maybe 60 percent but I think it's lower.

 

it seems liek everyone is takign numbers out of their *** and posting it, i want some real data proof.

and like i said at 220 wheel TQ the injectors are MAXED this means all 550s are at 100%

 

I skimmed the link, I don't have much time, being that I'm at work, but it just seems to me when they talk about limitations of duty cycle, they're talking about a particular map, not the actual LIMIT of the ECU or Injectors (although that is what they may state at times). Like I said, I'm not FC expert, and don't claim to be, but if your STOCK maps are set for 58-63%, then that is the MAX that you're going to get, for that load/rpm point; unless you change the load, in which case the duty will go up. Again, oversimplification, but I can't see why an ECU will restrict the voltage coming out of the ECU to be the equivalent of ~62% duty cycle... doesn't make sense AT ALL.

Bottom line is this: IF you believe it cuts at 62% (which I still doubt), or not, DO NOT TEMPT FAITH, and GO ON A DYNO! That's the bottom line. Arguing is lame... it proves nothing unless there's real numbers involved. On Sandors car, for example, I saw the injectors maxed out, and he cannot push past 10psi (even that's pushing it).

As a side-note, aren't FD injectors 550primaries, and 850 secondaries? That would explain why _THEY_ can run up to 14psi boost maxing out those injectors... FC are 550/550... correct?

If this goes on long enough, next time we dyno, I'll check the voltage on Sandor's injectors to prove they're being maxed out... arguing is boring and proves nothing, once again. Also... are there any sources that can confirm this other than some guys website?

Boris

P.S. Read this (http://www.newwave.net/~flanham/wlan...fuelfaq.html#1) you'll notice the ECU allows the Injectors to go up to 100% duty cycle.

 

HAHA

Sandor your going to blow your engine again. You dont even realize what the fmic and full intake is gonna do.

Get a microtech with 1680cc injectors

 

Please don't write stuff like this if you don't know for sure.

On my car the Walbro increased my line pressure by about 3#. I measured it.

Sorry, you guys have moved on, but I couldn't let it go.

 

I had my apex'i pressure gauge on my fuel system, and my fuel pressure went up 10 psi across the board, at pretty much all times. Even under WOT in every gear the pressure never dropped.

But that IS because the regulator was over run.



I'm wondering though, when was the last time you had you fuel injectors cleaned and flowed (to the guy that ran his car on the dyno)?

 

Ok... so you're trying to tell me you DOUBLED your fuel pressure by putting in a Walboro 255? I call BS! Unless you clamped the lines... JUST putting in the walboro will not raise it that much.

Disclaimer: UNLESS your FPR is THAT restrictive... and that's doubtful... like I said, no more BSing, we'll do number comparisons from now on... when sandor gets his Fuel Press Gauge we'll see what it is... until then, I don't buy half the stuff I read on this board... people create their own tales to ease their minds.

Boris

 

Oh yeah, I meant that I put in a Warlboro 255 also.

 

10psi sounds FAR more realistic... but that's not even a bar... I would believe 10psi... but that's not enough to run 14psi of boost as stated originally... since Sandors are leaning out at 10psi (boost).

L8r

Boris

 

Nah. I trust my Apex'i gauge, 10 psi isn't that much. Mazda didn't really overengineer ANYTHING on these cars, most of it is pretty much "good enough." Wiring, wastegates, whatever else.

 

I said my pressure went up 3#, which I thought meant 3 pounds, psi.

I ******* measured it. What more do you want?

 

you ok Heff man? Must be the skull avatar.

 

Yeah, sorry, that was uncalled for.

On a separate note, what about the thermosensor hack to get some more out of the primaries?

 

You need to be careful with your claims.&nbsp I've also found a ~10psi difference when jumping to a Walbro 255lph upgrade fuel pump myself.&nbsp I think you should've done your testing before claiming sh*t that doesn't happen...


-Ted

 

Rememmber, I never claimed to be an FC expert here... but 10psi isn't really much at all.. not nearly enough to run 14psi, and seems based on Sandors car, to not even be that safe for 10psi.

HeffBoost.... hey, sorry, I misread, I thought you meant 3bar. My mistake... don't get your panties in a bunch . Anyway... 3psi also won't do much....

Let me restate my point, so there are less arguments.... WHATEVER YOU DO, whether theoretically possible or not.... DYNO YOUR CAR. EOT!

Boris

 

A lot of people don't have access to dynos. Some people still want to upgrade their cars.

 

Well, then they should be careful running 14psi with a Walboro alone then.... I would say it's not recommended to touch a turbo rx-7 without a dyno in the first place... everyone knows they blow...

Hey, it's not like we didn't drive for 2 hours to get to a dyno. There are always dyno's around... spend the (minimal) cash and tune the car. At least get the money's worth you paid for all your mods. Tuning is a reletively cheap (for you guys especially), and most rewarding ($/hp)... just my humble oppinion, ofcourse.

Boris

 

ok well think of it this way..... 4 550cc injectors at 39psi fuel pressure flow enough fuel at 85% duty to support 280 horsepower and thats with a 11:1 fuel ratio if i lower it to a max of 63% it will only have enuff fuel to support 210hp at 11:1 fuel ratio.... so that leads me to beleive that the computer WILL NOT let the injectors open more than 63% duty dont you?

 

I WOULD believe that, IF you told me how you got 280 HP(I'm assuming CRANK) w/11:1 ratio @ 85% duty on 4x550s?

Boris

 

fuel calculator!