EVOSTEVO

iTrader: (2)

my afcII is showing high 1500s and i peaked over into the 1600 range and the car is feeling great at a slipping the gas to a full throttle, it pulls super strong. so what are some of you guys hitting on your afcs?

-Steve

Bom's Evo

iTrader: (14)

i get fuel cut at like 1650-80. but mostly i stay at around 1500s

PVD04

iTrader: (23)

I hit around 1780 peak with the mods in my sig at 21 psi peak tapering to just under 20. Before the cams I could get just over 1700. I recently did a leak test on my intercooler piping and found that my DV is leaking, so once I replace it I may be able to peak even higher.

-Paul

Warrtalon

iTrader: (6)

I just installed an S-AFC on my stock MR this week, and I am getting the same readings. At high RPM, I get at or above 1600, and it seems to be just right. The higher the gear, the more air I'm flowing. In 2nd gear, I got up to 1612, in 3rd I got up to 1632, and in 4th I got up to 1659, but I didn't get all the way to redline, because that was just faster than I wanted to go out in traffic. I was around 6700-6800 on the 4th gear run. I screwed up and forgot to reset the peak-hold, otherwise I could have told you the exact RPM. I'll be running at the track tomorrow, so if I'm dexterous enough, I'll try to hit the peak reset while I'm in 4th (probably not a great idea).

GOKOU

iTrader: (2)

This might sound dumb but can someone explain what the karma on the AFC II means, use for?

Warrtalon

iTrader: (6)

It measures the amount of airflow and is a very good indication of how much power you're making, imo. The measurement is in hertz and as far as I know, it measures the volume of air flowing through the Mass Air Flow (MAF) sensor...the thing your intake connects to.

As you can see, people talk about fuel cut in the 1700s, but that can be helped with injectors/afc. You can also see how that guy above has awesome mods and is flowing some major air (1780hz), whereas I am peaking at 1659 at the TOP of 4th. I'm nowhere near him there, and even further away in 1st-3rd gear.

gunzo

iTrader: (2)

Finally .. some karmann numbers to work on !!!
Can you guys correlate the freqs to what WHP you guys are getting ??

I'm hitting in the region of 18-1900hz .. at 23-24psi boost dropping to around 21psi at 7000rpms ..

Warrtalon

iTrader: (6)

Holy Christ, 1800-1900??!! That should be some nice hp, I believe. My 1600hz or so with the AFC set to 0 = 248awhp on a stock MR. I won't know the tuned AFC numbers until I get back on the dyno, but I will have track times both stock and with AFC tomorrow.

GOKOU

iTrader: (2)

I did a third gear WOT pull and peak karma was 1852 at 100% throttle. Good or bad?

Warrtalon

iTrader: (6)

Should be huge horsepower.

GOKOU

iTrader: (2)

Thanks. ONly problem is that the car is not running like it should. Ever since the clutch install my car have been laggy. I think I have a vacuum leak somewhere. My pump could be going bad causing a lean condition. Not sure.

TrinaBabe

iTrader: (3)

I hit 1926 in my car I guess I really "suck" literally! Thats also only at 19 psi. I do have some extra parts other than stock though

TrinaBabe

iTrader: (3)

Its also with a crappy tune I wanted to add.

GOKOU

iTrader: (2)

Cool! Go get that sucker tune!

berkel

iTrader: (5)

Cool,

I had asked about Karman reading before, but the posts never went anywhere.

First, per Malibu Jack, Karman should read ~30hz at idle, and reads 3hz when it's off.

My car always read 25-26 at idle. With the cams, it went upto 32hz at idle. Incidentally, my vacuum went down from 18 to 15 inHG after cams.

Before I would only hit in the mid/low 1500s. With the cams, I was hitting high 1600s untuned. Per other posts, fuel cut should happen at around 1700 hz, but this depends on atmospheric conditions, injectors, etc. My car was way faster, and it definitely seems to correlate to the karman readings.

As an interesting point, my car was way too loud, so I put the silencer in. My idle went went down slightly to ~30hz. Car still feels fast, but boost dropped and I'm only hitting high 1500s to low 1600s karman. You should feel the backpressure shooting out the exhaust at idle, heh. This seems bad for the turbo or something, I need to find another way to quiet down my exhaust.

Another interesting side note, my cel came on after installing the silencer. Haven't confirmed, but I'm fairly sure it's the secondary o2 sensor code. The silencer must be letting the sensor see too much exhaust. I may try to add another spark plug antifouler (only running 1 right now). Sorrry to digress..

FB