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Jan 10, 2004 | 11:12 PM

#21

XLR8NSS

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From: Deep in the seedy underworld of Koonerville

Quote:

Originally Posted by BigTex

Well, Harlan posted this:

You can convert MAF pounds/minute to grams/second by dividing by .132

SOOOOO.... 1 g/s = 1.3 FWHP. Convert to pounds/min is 1.3 / .132 or 9.84848~

So according to Harlan, multiply your MAF pounds by 9.84848 to get your FWHP.

Which is it John?

your method: My 44 pounds MAF would be 506 fwhp (too high) and at 20% loss, thats 405 RWHP. No way.

Harlan: My 44 pounds MAF would be 433 fwhp 346 rwhp at 20% loss. Much more realistic.
*************

Personally, I think that the 20% driveline loss is too high. Well, maybe not for the HEMI, which must have a 25%+ loss.

15% loss of 345 fwhp is 293 rwhp.

That is for forced induction apps Tex....Try again.

Seriously, though. For forced induction you use ~10 and for N/A use somewhere between 11.2-11.5. It's somewhere on this site from way back.

I don't know what to say about your 44lb/min MAF reading. I've seen it in the logs but, I still don't understand it.

It shouldn't be that high.

Jan 10, 2004 | 11:49 PM

#22

BigTex

? ? ? ? ? ?

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From: East of Dallas

That damn Harlan needs to be specific when posting stuff. I don't care if he lives in the turbo world or not. Crap.

Quote:

Originally Posted by XLR8NSS

I don't know what to say about your 44lb/min MAF reading. I've seen it in the logs but, I still don't understand it.

It shouldn't be that high.

I'm not going to complain. I'm just going to have to get it dynoed to see. If I start with 290 as a base and add up what each mod usually gives in rwhp (like 20hp w/ ASM headers), I can pretty quickly add up over 375 rwhp using realistic numbers. Who knows. Maybe 44 * 11 for 484 fwhp and 20% driveline loss for 387.

Need to remove the stock muffler to see what it can really do.

Jan 11, 2004 | 01:27 AM

#23

Yelo

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Joined: Feb 2003

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From: Geneseo, NY

So that means my stock internals/ intake/exhaust/tuning 6.0 with a MAF reading of 37.2 lbs/min@5200rpm makes 427fwhp@5200rpm !!!! yeah baby !!!!....even assuming 23% for the driveline that's 328rrwhp !!! (I dyno'd 291 stock and NEVER believed it.....I figured it was a dyno glitch or operator error........I'm believing it more and more now.......)

Jan 11, 2004 | 07:51 AM

#24

parish8

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From: omaha ne

i like the whole maf equasion thing BUT the thing to remember is these numbers if they are true are not SAE corected. i have seen a best of 34.3lb's but it was probably below 20deg at the time. correct that to 70deg or what ever the standard is and it would go down alot. i think anytime you are on a dyno they correct the numbers to standard for you.