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Need help deciding Speed Density or MAF

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Old Oct 25, 2016 | 08:11 PM
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Default Need help deciding Speed Density or MAF

Looking for opinions on which way I should have the tune done on my car. Its currently running on speed density but I'm willing to change back if it benefits me.

2004 GTO M6
Fast 92mm intake / 92mm TB
Unknown injectors? (The plastic portion of them is light baby blue colored?? Any help identifying them is appreciated)
233/239 .595"/.605" 112 lsa cam
PRC 2.5 5.3 CNC ported heads milled .017" 10.9:1cr
Longtubes / H-pipe

Old dyno sheet in the car when I got it says it made 433hp 369tq in 2013. I have tune scheduled in a couple weeks and Im wondering if I should just stick with the speed density or if there would be any benefits/advantages of going back to a maf tune with my setup?

It drives decent and gets ok mileage. The main thing I dont like about it is that it has a really high idle before it loses all ground speed. I'm assuming this is a setting in the tune. At low speeds it will begin to buck like crazy if you're in too high of a gear and it sometimes wants to die rolling up to a stop, from past experiences this is kind of normal for cam cars? Not sure, this is my first.

Thanks.
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Old Oct 25, 2016 | 10:55 PM
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Not normal behavior. Tune is off.

I prefer a MAF tune with a cam that doesn't produce a ton of "backwash" air. SD is more crisp, but the MAF is more stable. A good MAF tune includes tuning the VE table as well, so you get the blending GM intended...
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Old Oct 26, 2016 | 05:27 AM
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Originally Posted by JakeFusion
Not normal behavior. Tune is off.

I prefer a MAF tune with a cam that doesn't produce a ton of "backwash" air. SD is more crisp, but the MAF is more stable. A good MAF tune includes tuning the VE table as well, so you get the blending GM intended...
First off thanks for your reply, this forums isnt what it used to be!

I found a used K&N CAI kit for a GTO on ebay fairly local and ordered it, hopefully it shows up in just a few days. It has a MAF in it so I will get it all mounted up and figured out.

I've been reading about relocating my IAT sensor to a more ideal location than in front of the radiator, any advice on that?
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