All I can say is WOW !!!

Using the pid in HPTuners for delivered torque (which I know is not accurate...but it's at least consistant in its inaccuracy so it can be used to detect changes) I was never able to get above 345 ft/lbs with the MAF in place....in a direct comparison on the same road yesterday evening 15 minutes apart I went from 341ft/lbs @ 4400rpm with the MAF installed to 374ft/lbs @ 4400rpm with the MAF removed (in both cases the IAT was reading 121º)...that's just shy of a 10% gain in power !!!

I unfortunatly cannot see grams/cyl now because there is no MAF reading to derive that number from so I can't give you an actual airflow gain....but I CAN tell you that it pulls MUCH harder from 2800 rpm on up to the shift at 6000 than it EVER did before

I'm running a screened 85mm MAF (stock 6.0)....I'm absolutely stunned that it it's that much of a restriction on a baby-cammed 6.0, I can only imagine how bad it's got to be on guys running 224's and bigger. I'm considering a 235/239 .575 lift cam....trying to run that through the MAF would be pointless !!

I ordered a '99 Corvette IAT sensor that I'll wire in as soon as it gets here and rid myself of the MAF completely

 

I'd be more interested in what the dyno numbers would be before and after you removed it. I'm going to guess 'maybe' 3-5 RWHP

 

You should be able to derrive grams/cyl from sd mode. Works for us guys with no maf's at all. What tuning software are you running?

 

It doesn't "feel" like 3-5hp...I've been tuning this truck long enough to know what "feels" like a small gain and what "feels" like a big gain, you can't "feel" 3-5hp. I realize it's not a 10% hp gain but it's not 3-5hp....please don't take that as rude

I'm using HPTuners....if you can tell me how to see g/cyl without having the MAF installed please do so as I'd like to see that again

 

I would have to agree with this statement. If both are dialed in properly it shouldn't be that much different.

 

I'm talking about the restriction of the MAF in the air intake tract....NOT the tune....I changed NOTHING tuning wise !!

 

Your engine isn't big enough to get any real gain taking the MAF out of the air stream.Something else changed when you took it out.Maybe the intake temp or something. A correctly tuned setup like your's might see 3-5rwhp by removing the MAF.Now,maybe your MAF screen was faulty restricting air?

 

Maybe its running very lean since the MAF is not in the airstream which could explain the increase in power. In which case you wouldn't want to run it this way for very long. Just a guess...

 

THAT is possible....I didn't look at the screen when I took it out but it's possible that the screen is screwed up....

 

I had taken my maf off and my car wanted to go off then i placed back in the bellow and it was fine , so i dont know how can it run witout the maf

 

yelo,

taking my maf screen off shot me from 13.0 to nearly stoich at wot, i was like, damn my wb sensor is not working, after changes to the pe table to bring it back to the 13.0, there was a big gain on the street in my high speed runs.

i also have a lq4 with all the boltons and cam. i dyno 390rwhp

 

The VE table has to be tuned before you can try and run MAFless....

 

85mm maf and lid car be your friend in st. louis weather. it was near 100 today and now its 65*

 

i dont' belive in huge 'gains' like that. what you witnessed was the effect of 'unfucking' the computer by removing a miscalibrated sensor. if you got it right, there'd be no difference. go find a post by HumpinSS where Maf to Mafless difference was 0.5hp max throughout the entire revrange.

 

It sounds like you just accidentally got your a/f ratio right.

The only power to be gained from removing the maf is the MINOR restriction that it is in the intake tract.

For a comparison, I'd say your air filter is about the same restriction as the MAF. Remove the air filter in back to back dynos. You might see 1-2hp.

 

When I replaced my MAF with a straight thru pipe (had been in SD for some time) I saw my VE table take a slightly different shape and felt nothing on the SOTP dyno.

 

tuning...its all in the tuning.. you can get the same power both ways, its already been proven. some people can't get CL tuning done right... others can do MAFless and get it dialed in fine...

 

Did you see a before/after difference in MAP reading at WOT?

 

That torque figure would be based on a calculation based on g/s of airflow, possibly ignition timing and operating rpm. VE effects the g/s therefore if it was untuned and not the exact same fuel mixture as when you had your MAF calculating g/s then you will have more torque. The only way you can compare those torque figures and g/s of airflow is if your mixtures are tuned to be exactly the same at the same rpm for both SD and MAF tunes.

 

what i'm wondering is if i was at 13.0 with my lm1 with screen on, then tuned back to 13.0 once screen left, what was different and how come i noticed a big gain, i think dyno's dont prove as much as quarter mile times and races.. not trying to argue, just tring to understand, but what was uncalibrated