Just Ported MAF and Throttle Body bypassed.. Have questions

[shadyphi]

As the title says....

Just thought I'd ask though, is there anything I should be aware of?

I looked for leaks, didn't see any. No check engine light.... so I guess I'm good?

Oh, I did notice the idle seems a tad different... by different I mean that it idles a 1000 rpm, and every now and then drops to 800 then jumps back to 1000..... normal??

By the way, do I need the PCM programmed for this too?

[96Camaro]

Hmm...well i know that my car idles at 1000 rpms usualy, is that high or somthing? always seemed fine to me but idk.

[shadyphi]

Hmm...well i know that my car idles at 1000 rpms usualy, is that high or somthing? always seemed fine to me but idk.

No, I don't think thats high... I'm just wondering about the drop to 800 and then back to 1000....

[Injuneer]

What exactly did you do when you "ported" the MAF? Hack it up bad enough and you'll have idle problems. Really not a very useful mod, IMHO. Stock MAF is fine.

Any chance you dripped coolant on the Opti when you did the coolant bypass?

[Rob B (shoebox)]

No, I don't think thats high... I'm just wondering about the drop to 800 and then back to 1000....

That's the downside to porting the MAF. The data now received by the PCM is no longer matched to it's tables. Mass air calibrations are now off. Some programmers won't even tune a car with a ported MAF (because the calibration is lost). Porting the MAF was the rage years ago, but since then most have learned it is better not to mess with it.

[Craig 94 TA GT]

I switched back to the stock MAF ends, unported with the screen on. This was after using MBA MAF ends. I think the idle is smoother with the stock MAF. However, when I talked to Bryan at PCMforless, he recommended I put the MBA ends back on because he has programmed many more cars with them. But the big kicker is that he said he has not seen any gains from ported ends...and he has seen many dynos.

[DeWynter]

The stock MAF in my 89 can flow up to 658 CFM with the screens removed. This is well within the amount of air that my 383 can gobble up. What can a 4th gen MAF flow stock? What would be the benifit of Porting the MAF? I always thought that a stock MAF was good for almost any NA engine, I only thought you needed to replace the MAF when boosting your engine. Can anyone clear this up for me?

[Craig 94 TA GT]

Thanks to RangerBob, http://dtcc.cz28.com/flow/ shows the flow of a de-screened 4th gen MAF. 719 cfm according to them. Not sure of the difference with the screen though

[thenuge876]

ive heard about a lot of people messing around witht the maf's before. I read up on it (at least for 3rd gens) adn it seemed that it was a bad idea, mainly becuase of what was mentioned earlier (the computer calibration is off) so that your engine isnt getting the proper readings and that there isnt really any gains from doing it. Although if you did flow more air and had an engine that could use it all and someone to tune it right, i suppose it would be ok. But for an NA car that is mostly stock it probobly wouldnt be necessary.

[Jeanius]

So what exactly is "porting" the MAF? What do you do to it?

[shadyphi]

Here is where I learned how to do it.... http://www.installuniversity.com

I'm up to trying new things though, and really don't care if I screw it up, because I have a spare stock MAF

I guess I like to learn the hard way.. lol but, I have learned to buy spares, so I can always go back if I royally screw up.

[thenuge876]

Good idea man, if stuff doesnt work out it always is good to have some spares lying around to use in a bind.