MAF says 310 grams/sec@5800rpm......
Jan 16, 2006 | 01:26 PM
#13
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From: Las Vegas, NV
Originally Posted by Yelo
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
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
you have to compensate for how much the blower takes back out of that.
Jan 16, 2006 | 01:55 PM
#14
Originally Posted by zippy
you have to compensate for how much the blower takes back out of that.
Jan 16, 2006 | 04:00 PM
#16
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From: Deep in the seedy underworld of Koonerville
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.
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.
My stock LQ9 6.0L has pulled down 38lb/min in stock form.
That was a high reading. It routinely will hit 36-37lbs/min though and that is around 5400rpm is I remember correctlyFor 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.
Last edited by XLR8NSS; Jan 16, 2006 at 04:12 PM.
Jan 16, 2006 | 04:13 PM
#17
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From: Geneseo, NY
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
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
Jan 16, 2006 | 05:56 PM
#18
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.
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.
