Working on tuning a 4 x 1600 injector setup.



1600 primaries and 1600 secondaries.



Have been able to reduce the fuel at idle (1000rpm) to maintain a high 10's AFR, I can live with that.



Sharp on and off throttle actions feel good.

@WOT everything looks/feels great.



BUT, light on and off throttle changes is very jerky, any suggestions?



K

Throttle pump adjustment? https://www.nopistons.com/forums/pub...R#>/unsure.png



Is the Power FC sequential or batch fire?

i've heard that with the 1600s there may be flow differences by as much as 10% you might want to have them flow tested in case you need to match two similar primary with two similar secondary

yeah, look at the accelerator pump. if you have it mapped out rich, you dont need much accelerator pump and vice versa



mike

Maybe Dragon will chime in. Why did you do 4x1600 instead of running a set of Tertiaries?

I use 4 x 1680's ran by a Wolf EMS...Works great for me...The idle was a bit tricky but even with my large single port it idles perrrrrrrfect... I don't know anything about the Power FC's but that can't be fun tuning them ....







www.injector.com



I think 1680 bosch's are 80.00 a pop...cheap!!!

tossing 4x1600's in the car was easier than rigging the PFC to fire 6 injectors... (Or so I thought) hehehehe



k

eventually i will put in the 1600cc primaries but there is no need for now...

I was running out of fuel with 850pri, 1600sec at high boost levels and high RPM's which is why I had to go larger.



of course you have no need now vosko, your car is slow. https://www.nopistons.com/forums/pub...IR#>/smile.png



K

You shouldn't be running out of fuel that fast. How much boost are you running?

yeah my car is slow. atleast i can launch my car https://www.nopistons.com/forums/pub...1047683473.gif

20psi+

fuel was ok to about 8000rpm, but beyond that I was hitting 100% duty cycles. AFR's were mid - high 11's.



This thread isn't about why I had to go with larger injectors, https://www.nopistons.com/forums/pub...IR#>/smile.png it's how to tweak it to run smoothly under soft on-off throttle changes. I have a feeling the accelerator inj values are the key, 7ms with a 1600injector is ALOT of added fuel...



K

yeah the cool thing about 4x1600 is the transition is easy ! https://www.nopistons.com/forums/pub...IR#>/bigok.gif

hahah, I COULD learn to launch my car hard/well/fast, but I don't like breaking things as much as you do... https://www.nopistons.com/forums/pub...DIR#>/wink.png



k

no i meant. we finally figured out how make my car not break things when i do burnouts, launching, donuts, drifting. i'm an animal when i drive the car around..... https://www.nopistons.com/forums/pub...#>/biggrin.png



i have a diff brace coming and subframe braces... the car will be nearly indestructible.... well i haven't been able to break it and you know what that means https://www.nopistons.com/forums/pub...IR#>/boink.gif

If you don't break, you are not driving hard enough!

saw your post on the datalogit forum and Toddp31 linked me to this post... The power FC won't fire less than 1.5ms and that is why it's so rich at idle with the 1680's..



Your probably going to need to mess with your injector secondary transition (ms) settings... I think around .500 or so will get you in to the ball park..



You also need to change the front primary, rear primary and secondary injector lag diffrences all to .45 ms



Also try changing the injector overlap settings to 14, 14, 8 I think this will help out a lot by making the injector transition happen over a greater time...



If you can let me know what the effects are I'll try to give you some more numbers depending on what the car does..

ummm right. have you seen ANY of my videos and ANY of the chaos i have done to my car https://www.nopistons.com/forums/pub...#>/biggrin.png

Dragon, Thanks for the info. I'll do some adjustments per your advise, log and take notes, then let you know what I haven't been able to tweak out...



K

If you have a RX7 **** will break. Oh well, fix it and go faster right Vosko! That is why there is a AFTERMARKET!



4x1600 + high boost easy 10's if you have any driving skills!

by the way I'm running 6 injectors.. https://www.nopistons.com/forums/pub...#>/biggrin.png 2 x 1680, 2 x 720 and 2 x 550's for a total of 5900cc's of fuel and I'm only hitting 76-78% or so on 22psi of boost at a conservative 11.1:1 afr.. Now that I have my new .9-1.3 kg wastgate spring we're going to shoot for 24 or 25 psi and see if I can keep the engine together with this T70... She seems to want more so I going to keep rammin air in there till she stops making power or chucks a apex seal...

If it blows then 20b!!!!!!!!!!! https://www.nopistons.com/forums/pub...#>/BURNOUT.gif

lol.. My car is so reinforced I feel like I'm driving a tank at times.. It's solid a **** and I even get a nice free massage while sitting in my carbon/kevlar Recaro seats to boot...

i ran 19.4 psi accidentally for like 5 seconds.... OMG that was just ridiculous. i can't wait to run high boost 20lbs... should be like 500+ at the wheels https://www.nopistons.com/forums/pub...IR#>/smile.png

a bridged 20b with 6x1600, that would be fun to tune! And get great gas milage!

just do p-port 20b with a T100 dual ball bearing https://www.nopistons.com/forums/pub...#>/biggrin.png

According to fuel hp calculator for rotory's using a .70 BSFC, 50 psi fuel pressure with all my injectors and my 78% duty cycle I have mad power going on and I want more..



Rotory Fuel HP Calculator

That is the casket I want to die in!

Dragon are you going to dyno it?

i think my winter project is gonna be the 1600 primaries and two bosch hiflow pumps instead of my SX pump

We don't have any dyno's here that are any good.. anything over 400 hp will slip tires and you can't get a good reading.. being in okinawa sucks and is great at the same time... tunned cars everywhere and a good race scene, but shitty dyno's and no 1/4 mile.. Rumor has it we will have a 1/4 mile before the end of this year.. I know my car will run low 10's with Nitto's, but I have no way to prove it.. https://www.nopistons.com/forums/pub..._DIR#>/sad.png I'd really like to get a run with the 13B before I go to the 20B... https://www.nopistons.com/forums/pub...DIR#>/wink.png

1000 primaries should be enough but big is always better! Or some additonal 850/550/720/1000. I just think the 1600cc is to big for primaries if you drive at around for transportion. What that old saying, " Could pass everything but the gas station."

yup, the difference between 17psi and 20psi is huge!!! Just need a little water injection and run 20psi all day on pump gas... https://www.nopistons.com/forums/pub...DIR#>/wink.png



K



BTW: I'm going to try to make it to rotorfest with my car next month! https://www.nopistons.com/forums/pub...#>/BURNOUT.gif

YES YES YES>>>>> Did I say that I LOVE my Aquimist water injection.. The highest knock reading I've gottin on my Power FC is 19 running over 50+ runs at 1.4-1.5kgcm of boost... I used to be happy getting under a 40 knock reading at 1.2... https://www.nopistons.com/forums/pub...R#>/tongue.png

Dragon guess you need to come visit the mainland then, wish it was cheaper!

I may just look for a job while I'm up in your area end of next month...

i was thinking about water injection/aquamist..... i think that might be the next thing i buy. thanks for reminding how to spend more money!



rotorfest will be AWESOME.... hopefully can have a dyno day the saturday before it ! https://www.nopistons.com/forums/pub...IR#>/bigok.gif

No problem Vosko... I'm always good at telling people how to go broke.. https://www.nopistons.com/forums/pub...IR#>/bigok.gif , but it'll save you big $$$ in the long run...

Then we'll see more threads saying you broke some more parts.