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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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08-19-2020, 06:08 PM | #15 | |
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What was your before/after MAFv usage? And conditions of testing? Did you test TB and IM porting separately? Grams is at least 70mm exit side i had to port match my 67mm TB spacer making it much larger to match up, but yeah without porting the entire manifold at least to the plenum you’ll always have that bottleneck which most people don’t do yet claim a “butt dyno” difference. And you’d probably need an equally sized intake pipe going to the TB, and a filter with enough flow to match. Edit: my TB was not grams. It was blox 70mm, 70mm straight through even on exit side. Last edited by 86TOYO2k17; 08-20-2020 at 12:59 AM. |
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08-19-2020, 11:39 PM | #16 | |
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The Following 2 Users Say Thank You to FunnyGopher For This Useful Post: | 86TOYO2k17 (08-20-2020), Tanstin (08-26-2020) |
08-22-2020, 01:54 AM | #17 | |
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08-22-2020, 02:21 AM | #18 | |
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I have re-scaled the MAF at some point but I did not do it prior or during the swap between TBs. When I did it was from switching intakes from MY17 airbox to TRD. The MAF was waaay off during closed loop. Other than that I did zero tuning for the TB in say the torque demand table or pedal angle table. The IM was ported ran with with an OEM TB, then 72mm TB $300 and finally 68mm bored out OEM TB $160. Similar conditions for data logs as temps and barometric pressure make a big enough difference in MAF reads. Also extrude honed MY17 IM ~$550+ I know how people hate the butt dyno reference but literally vtec at 6.5k rpm..But this feeling goes away once the TB is enlarged. More area under the curve it seems. I have played around with intake pipping diameter. The resonator on the OEM or Mishimoto intake keeps the MAF very happy in logs. Its so much smoother but larger tubes seem to have a positive effect for my setup. So currently its 75mm ID tube to the flange of the bored OEM TB 72mm-68mm iirc. Similar ID to all the tube available for this chassis. |
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