R.O.D

iTrader: (3)

Edit: too enthusiastic lol


^gonna give this a try

skir2222

I think it will work out for you very well, just start off with a coupler reducer and use the smallest pipe you can then keep increasing the size after you have successfully tuned it with the first choice of diameter pipe.

As long as the flapper door functions under start up and idle your good to go, you can increase the pipe size.

I believe you can also reduce the spring tension on the flapper door as well so thats another way of making this work.

timfaris

I hope someone can figure this out it would be nice, i talked to support at rtek digital tuning and he was surprised that the rtek for was talking so much about this afm delete. lets keep it up and turn some gears.

timfaris

Heres an idea, how about usinng the rpm metering system to trigger the response that the afm sends, like as the rpms gain it show it to the ecu in volts or ma either way a added resistace or capactitor, added to the full rpm range wouold set off the events of the afm, equaling out the a/r / timming etc. in and out of load. but idk the system that well just know electronics and know you can add what you want when your the builder of the system, or have knowledge of the works and what you want to do.

K-Tune

iTrader: (26)

What the hell are you talking about...

timfaris

The rpm gauge sends a signal through the ecu. hence how the data logger knows the rpm's. That signal is some type of voltage. The afm sends a signal to the ecu of some type of voltage the o2 sensor the atp every thing has a range of voltage going through the ecu. Make a jumper in the chip or a adapter that sends a signal from the rpm gauge that clones the afm. The mass air flow runs on 4v,2vand5v right. So divid each stage into the equal of the whole for each stage, for exsample, half open is 2v and half open is 2,000 rpm's that would be .5v per every 500 rpm's telling the injectors that it is half open at 2v and the timming as well.

timfaris

You could use compactitors to up each .5v back to 2v if needed to keep the ecu thinking the afm is still there. i mean how does a haltech ,motec or megasquirt do it. its sending a signal from somewhere and reading it like the afm is still there.

K-Tune

iTrader: (26)

It's called speed density and it uses a map sensor. Everything you said is gibberish. Please post less and read more.

drifting in drifting

iTrader: (11)

There will never be a afm delete. Just go buy a dam standalone

13B Etc

iTrader: (2)

Best laugh I've had all week.

boostedfc3s

iTrader: (2)

I agree. No offense to the people at Digital Tuning because I think the Rtek is a awesome product if you are lightly modded. I have my old 2.1 installed on my wifes S4 TII and it works great with her setup ( stock turbo and bolt on's). But if you are maxing out the AFM then it's time to step it up.

solareon

iTrader: (1)

This. If you are making more than 320whp like I was with my rteked S4 T2 then it's time to step it up to a different ecu. Once you get to more than double the original car's output on the stock ecu from the 80s it ain't gonna be able to compensate no matter what.

VWTECH

how about building a map based on throttle position, rpm, and intake temp that would output from the rtek and use it as the afm signal? is that retarded or would that work? i'm still trying to decide what management to use and this topic is very important to me. i'm trying to run itb on a street ported motor with e85 fuel

righthandfc

i also have a rtek on a s5 and have 310rwp at 10psi and well thats not bad for a daily driver thats get better gas milegae than my N/A s5... if u want more power i agree get a full stand alone or just get a REW engine...

Rub20B

Also tempting to go Rtek, just apart from the big bottleneck of the S5 AFM..

Now people can laugh, I don't mind, but what abotu just running 2 stock S5 AFM's in parralel, then use a simple opamp circuit to average the voltage and send it to the ecu, this way, the airflow coming in the ecu is just half of the real airflow, and by doing a simple x2 on the airflow axis.. this way, airflow till about 600whp would be no problem..

offcourse the resolution at idle will be less, but face it, a healthy fc idles fine at 550 rpm running slightly rich, worst case one increaes the idle to 1200 rpm and call it a day.

What do you guys think?

Clubuser

[QUOTE=Rub20B;11115054].....what about just running 2 stock S5 AFM's in parralel, ...... this way, airflow till about 600whp ...QUOTE]

ain't happening @ < 15 psi boost (map sensor's limit). well, unless it's spun @ 12K rpms!

Rub20B

Hmmz, then the map axis also needs to be rescaled, should also be not too hard or? Is this ecu using a linearisation table, or just the 8 bit ADC output?

good thing is that the map output is linear, meaning that if using a different map a simple factor would be enough to make up for the difference

gxl90rx7

iTrader: (1)

if you look at your logs, airflow follows the map sensor pretty closely



im not sure if "airflow" is direct AFM input or if it is calculated based on some of the other sensors..

i was thinking about just making a hardware voltage inverter/scaler circuit that would plug inline with the map sensor and replace the AFM, so you could connect your map sensor to the AFM input, and tune out the difference.

the map sensor is 0-5V, whereas the AFM is 4 to 0V (low load to high load)


the problem is i dont have an FC anymore. to do this, someone knowledgable just needs to connect a voltmeter to the AFM output and post up what readings they get at idle, 0psi, and various boost levels

Rub20B

thing is that x bar boost at y1 rpm and x bar boost at y2 rpm are (hopefully) very different airflows

gxl90rx7

iTrader: (1)

i see, and the log i posted was mostly consistent rpm. hmm i wonder if it could still be tuned out with the fuel correction tables. anybody want to make another log of just boost, airflow, and rpm, but try to vary rpm from 3k to redline?

Rub20B

basicly the easiest would be to use something like a HKS VPC or Super AFR..

turbo2ltr

iTrader: (1)

That has been discussed at length many times. I even gave an explanation of why this won't work on the previous page of this very thread.

https://www.rx7club.com/showpost.php...1&postcount=42

gxl90rx7

iTrader: (1)

lol oops maybe i should have reread the thread

Rub20B

Let make it even easier, run 2 mafs in parallel, average the output and use injectors double the size?

Clubuser

^^ you plan to produce HP past 7500 @ 15 psi? why bother? after money spent on the extra hardware, time spent adapting, and likely pop the block in the process, you'd wish you had just gotten a stand alone. well, if you want to still go ahead w/this project, let's know how it all worked out.