TPITuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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What I knew before
-a stock head at .442" of lift (1.6 rockers) flows 190 cfm @ 28"
-a stock head at .415" of lift (1.5 rockers) flows 187 cfm @ 28"
-a stock runner flows 203 cfm @ 28"
-a stock base and runner flows 199 cfm @ 28"
-a stock MAF flows 529 cfm @ 28"
-a MAF with no screens flows 711 cfm @ 28"
-a stock TB flows 668 cfm @ 28"
-a stock TB with air foil flows 709 cfm @ 28"
What I found (in order of best flowing to least)
-The adapter I used flowed 677 cfm @ 28"
-V6 Lid with a V8 MAF w/o screens flowed 581 cfm @ 28"
-V6 Lid, V8 MAF w/o screens, Base w/o Baffles, Top of Center Ridge Cut Out,
K&N lengthwise flowed 562 cfm @ 28"
-V6 Lid, V8 MAF w/o screens, Base w/o Baffles, Top of Center Ridge Cut Out,
K&N widthwise flowed 560 cfm @ 28"
-V6 Lid, V8 MAF w/o screens, Base w/o Baffles, K&N flowed 558 cfm @ 28"
-V8 Lid and MAF flowed 535 cfm @ 28"
-V6 Lid and V8 MAF flowed 512 cfm @ 28"
-V8 Lid, V8 MAF, Base w/o Baffles, K&N flowed 511 cfm @ 28"
-V6 Lid, V8 MAF, Base w/o Baffles, K&N flowed 502 cfm @ 28"
-V6 Lid, V8 MAF, Base w/o Baffles, Fram flowed 470 cfm @ 28"
-V6 Lid, V8 MAF, Stock Base, Fram flowed 444 cfm @ 28"
What you can see is the fram filters choke the breathing to 470 cfm but as soon as you drop the K&Ns in it flows 32 cfm more with no other changes. Another interesting thing is the variance in the 2 lids. Im guessing it is just manufacturing differences as the sensor in the V6 lid should not cause that much less air flow. Notice how the V8 lid actually made the screened MAF flow more due to less turbulance? Then there was 2 cfm difference just by turning the filters. Also, cutting a 6"x3/4" hole under each one of the filters increased flow by 2 cfm indicating the filters/lid are likely the cause for restriction at that point so everyone that completely guts the base is gaining very little unless they have better than K&N filters and have modified the lid.
I will run a descreened MAF with the V6 lid, base with the baffles removed and tops of the center ridges cut out, K&Ns lengthwise setup for now. Just remember the stock throttle body with air foil flows 147 cfm more than a gutted airbox, K&N, descreened MAF combo.
If anyone has flow data for the plenum attached to the runners and base I would really like to see it. The flowing was done on a superflow 1020 flowbench.
Re: TPI flow data including camaro air box, still would like to know plenum flow data
The V8 lid alone is going to flow a little better than the V8 MAF w/o screens, V6 Lid combo but not much. I would say no more than 600 cfm.
The V8 lid with a gutted base and K&Ns will flow a little better than the cut w/o baffles base, K&N, V6 lid, descreened MAF combo I posted. For that combo I would say no more than 580 cfm.
I can say this because the MAF w/o screens flows 711 cfm and that will obviously be very little, if any, restriction so the only real change would be the V6 to V8 lid.
