MAF says 310 grams/sec@5800rpm......
 

How does this correspond to what some of y'all 6.0 guys are seeing for NA MAF readings ??, I'm just curious to see how the LS1 heads/Shorty headers flow compared to whatever you guys are running....

I'm pulling 53lbs @ 5600rpm

Thats really decent airflow.......My setup max's out at 283 g/sec with the mods in my sig :judge:

That's because you're supercharged dipshit......and I'm STILL gonna hand you your ass NA :)

That compares to about 41lbs/min for mine......you don't happen to have yor NA flow numbers do you Devin ??

No, sure don't bro.

oh yeah, I ain't getting any slower punk!

HAHAHAHAHAHAHAHA !!!!!!

I've at least gotta give you that.......it looks like it's gettin' about time for me to start working on those twins

I just saw 328 grams/sec @ 5900rpm a little while ago coming to work.....

I've read a few times that on these trucks if you multiply MAF grams/sec X 1.1 it gets you a pretty close RWHP number.....can anyone back that up ???

mroegrip: If that above calc works out that would put me at around 360ish and you around 440hp at the tires ....do you have a dyno run to compare that too ???

damn...I may finally have to admit that you *might* be faster than me grip

Come into to the light, feel the light, know the light, see my tail lights, so let it be written, so let it be done :judge:

Right now i am pulling in the low 50s lbs per min. I also have 408 and big heads

338 g/s in Shawns 2500hd with a small cam (220/224 572/577), muffler, 160 stat and 22 degrees total with a 12.8:1 AFR.

These can be way off though if someone is messing around with the MAF table when tuning, seen it a few times.

My MAF tables are stock so I'm pretty sure I'm actually seeing correct g/s

I'm running a 210º/218º .531/.531 114lsa Vinci Cam with 26º total timing and stock 14.7:1 AFR......

stock should be alot richer than that at wide open.

you have to compensate for how much the blower takes back out of that.

I'm figuring approx 400rwhp +/- using my 1/4 mile mph of 98.8 with a 5800lb raceweight.

Stoich is set @ 14.68:1, VE has been modified based on LT's.....other than that it's the stock AFR

At part throttle 14.68-14.7 is fine but, at wide open throttle 12.5-13:1 is about all you want to go for NA.

My stock LQ9 6.0L has pulled down 38lb/min in stock form. :eek2: That was a high reading. It routinely will hit 36-37lbs/min though and that is around 5400rpm is I remember correctly

For NA engines I think multiplying the maf lbs/min by 10.5 will give you a close estimate to engine output at the flywheel. It's been a while since I've messed with all that though but, that is what I remember being close.

short of buying a wideband how can I get the AFR at WOT where I want it to be ???

If I use those calculations it looks to be around 430 at the crank and 340ish at the tires....pretty close to the other calculation

Those calculations can't be very accurate. On a nice staedy line on the MAF at 6300rpm I logged 327.79 G/Sec = 360.56 Rwhp
43.26 Lb/min = 454.23 Fwhp

For a peak I found 341.14 G/sec = 375.25 rwhp
45.02 Lb/min = 472.71 Fwhp

The only things I have changed from my dyno pull of 333 rwhp are UD pulley and a different air intake. Oh and my intake air temps were about 40* cooler.

There's no way it's gonna be 100% accurate.....but at least it's a good way to guesstimate

agreed, i guesstimate your slower than me :jest:

I found my log from my dyno pull

328.07G/sec = 360.8 @ 6260 rpm Using 1.1
Actual dyno hp = 333.1 @ 6260

i've hit between 46 47 pounds