Excuse my ignorance please. Maxed out MAF? L76.

[04blackgmc]

I have a procharged G8 GT with 6.0 L76. Made 558 last year but just recently did Heads and cam
I have this style MAF


Does the OEM software with this maf max out around 12,000HZ or so?

I'm seeing as high as 13,000 and the car is going leaner on the top end i do have some fuel pressure drop off but i did before with no big issues but i was around 11,900-12,200 HZ MAX!
Now im hitting 12,000 HZ on up by 5,500 RPMS.

Debating if it would be more helpful to do a ls7 maf in 3.5" piping or do the VCM Enhancement that increases the MAF.

[gn2beatu]

Skip the 3.5" piping unless your whole CAI is that size. 4" is the way to go for sure. Sounds like scaling the tune is in your IMMEDIATE future. Id just scale it and be done, that way you have more MAF resolution for future mods. Plus when you scale the whole tune, you gain resolution in the timing table that way. I had a LS7 MAF in mine for a short time in a 4" tube before I went OL SD. It was real easy to dial in the MAF. You will get more stable IAT temps too, less heat soak with the LS7.

[262]

Walter, when you scale a tune you lose resolution to gain range. You have it backwards.

[04blackgmc]

Current piping is 3.5"

[DSteck]

Skip the 3.5" piping unless your whole CAI is that size. 4" is the way to go for sure. Sounds like scaling the tune is in your IMMEDIATE future. Id just scale it and be done, that way you have more MAF resolution for future mods. Plus when you scale the whole tune, you gain resolution in the timing table that way. I had a LS7 MAF in mine for a short time in a 4" tube before I went OL SD. It was real easy to dial in the MAF. You will get more stable IAT temps too, less heat soak with the LS7.

Stop.

[gn2beatu]

That came out backwards. Thanks 262. Sorry OP, you gain range, not resolution. I get to typing too fast, and too often what I am thinking comes out wrong.....sigh. Not the first time I messed up the wording, and wont be the last, will have to re-read my posts twice before I hit the reply button.

I had a really bad car accident about 5 years ago, (hit by unisured motorist at dead stop, they where going 45mph) I have had 5 different kneck surgeries, and ended up with some mild brain damage from my head hitting the door pillar. My memory hasnt been the same since. For 6 months I couldnt remember my employees names I worked with for years. My short term memory was completely gone for quite a while. And what I am thinking sometimes is hard to put in words. Im probably 90% back to normal with the exception of saying what I am thinking sometimes (out loud and in writing). So I apologize, but my intent is good, and I do enjoy helping others. Sorry 04blackGMC.

[5_Liter_Eater]

If current piping is 3.5" then converting to a card MAF in the same 3.5" pipe isn't going to buy you anything. Need to use a 4" pipe to lower the frequency per unit of airflow.

I guess I'm not familiar with the later 4th gen MAF lmitations or enhancements and whether the MAF frequency range is extended.

[DSteck]

If current piping is 3.5" then converting to a card MAF in the same 3.5" pipe isn't going to buy you anything. Need to use a 4" pipe to lower the frequency per unit of airflow.

I guess I'm not familiar with the later 4th gen MAF lmitations or enhancements and whether the MAF frequency range is extended.

Are you kidding? I made ~800rwhp maxing at 12,900Hz in a 3.5" housing. The LS7 MAF reports totally different, and the depth of projection into the airstream comes into play too. Need more resolution? Go deeper. Need more range? Go shallower.

It's not the MAF and it's not the OS here.

[5_Liter_Eater]

If you're going to go through the trouble of converting to a card style I can't see not moving up to 4".

[DSteck]

Well, when your throttle body is only 90mm, there isn't much point. Not to mention 4" piping gets pretty tight sometimes. It is a lot easier to weld a MAF bung into the existing pipe and replace the original MAF with a straight piece of pipe.

[IDRIVEAG8GT]

Wtf? I'm making 658 through MAF and theoretically I have another 320 horsepower left to grow withmy MAF unit. However I'm sucking through a MAF, not blowing through it.

All things aside your MAF should handle that sort of volume just fine, but I think there's something wrong with it.

I'm gonna go left wing here and say Abaco MAF would be a permanent solution if you can get it tuned right.

[IDRIVEAG8GT]

There's another procharged G8 making 669 MAF only. Seeing 11,800Hz Max. Try replacing your stock one for another stock one. You may've got yourself a weak MAF.

What are you doing for fuel pump Shane? I'm pretty sure the stock one with a BAP just ain't gonna cut it, especially now that you're up another 85-100 horse.

[DSteck]

He doesn't need the Abaco.

[IDRIVEAG8GT]

He doesn't need the Abaco.

That is why I said as a permanent fix., My second post directed him to replace the MAF he has now with another stock one. It appears to be weak.

[04blackgmc]

There's another procharged G8 making 669 MAF only. Seeing 11,800Hz Max. Try replacing your stock one for another stock one. You may've got yourself a weak MAF.

What are you doing for fuel pump Shane? I'm pretty sure the stock one with a BAP just ain't gonna cut it, especially now that you're up another 85-100 horse.

Yea i was seeing a peak of 13,100 HZ on the maf...

Still stock fuel system with a BAP.
I'm really trying to pick out/figure out what route i want to go with the current system.

Yea the car is moving ALOT more air now than it did before for sure.
I was also only seeing about 9.5 PEAK psi on the current setup at 6,700-6,800 RPMS

[IDRIVEAG8GT]

Given some careful thought, the MAF may actually not be the culprit.

I'm actually starting to think that the MAF is in the wrong place overall.

[04blackgmc]

Given some careful thought, the MAF may actually not be the culprit.

I'm actually starting to think that the MAF is in the wrong place overall.

Yea the placement for the MAF in the procharger kit is there.
http://www.gmhightechperformance.com.../photo_30.html

[vette_c6]

i have tried 100mm maf
740 RWHP on 5500 RPM and then the car was spinning on the dyno ,,,
i guess it worked :S