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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 10-11-2020, 09:29 PM   #225
Tokay444
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54mm should be the minimum.
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Old 10-11-2020, 09:41 PM   #226
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54mm should be the minimum.
Based on what? That sounds way too big to me. If you can make 270hp on 50mm ITBs on a 3SGE beams revving over 9k rpm what would make you think the FA20 (that cant even safely sustain revs to 8k) would need TBs that big?

Edit: After some googling I am guessing you are used to Hondas. FA20 =/= K20. FA20 is lower revving and doesn't have the Vtec big cam to deal with.
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Last edited by Turdinator; 10-11-2020 at 10:21 PM. Reason: vtec yo
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Old 10-12-2020, 11:15 AM   #227
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Based on wanting make any real gains.
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Old 10-12-2020, 01:54 PM   #228
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It seems like they are using 4AGE 20v ITBs. The start of the thread lists the throttle sizes as 45mm for the Sard and 48mm for the Greddy. I would have thought the 48mms would be enough for this motor. Do we know which was used in for this dyno? The Sard does seem to have a greater volume plenum and shorter runners which I think would be preferable. Maybe a mix and match would net better results. I also know you can get 50mm TBs from people like Toda. So if its only the TB size that is restricting things there are ways around that if you are prepared to spend a little extra.

The first dyno used the Greddy 48mm ITBs and supplied plenum. The second dyno used the Sard ITBs and no plenum. SUR Fab a NZ company that makes some very nice CNC 50mm ITBs for the 3SGE as well. But IDk at least with the plenum installed you could get the same affect or better from the RacerX IM for >$900. Swapping out ITs easily doubles the cost..
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Old 10-12-2020, 02:38 PM   #229
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Stock head flows 265cfm.
With the butterfly's so close to the actual valves honestly the sizes on both the kits are way too big.

Read:
https://racehead.com.au/designing-pe...-should-i-use/

Source of head flow
https://dsportmag.com/the-tech/educa...ylinder-heads/
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Old 10-12-2020, 10:18 PM   #230
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Lol.
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Old 06-25-2022, 04:12 PM   #231
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Old 06-28-2022, 03:36 AM   #232
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They needed a motec ecu to get it to work
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Old 06-28-2022, 03:39 AM   #233
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They needed a motec ecu to get it to work

Yeah they removed the MAFS which the stock ECU needs, so they needed a standalone.


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Old 06-28-2022, 08:47 AM   #234
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I'd be curious to know how the ecu monitors intake air volume without a MAF or MAP. If not monitored it's almost like having multiple carburetors.
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Old 06-28-2022, 10:21 AM   #235
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Just install 4 sensors
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Old 06-28-2022, 12:47 PM   #236
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Just install 4 sensors
Easier said than done. (IMHO)
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Old 06-28-2022, 11:32 PM   #237
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Obviously. Kind of trolled a bit
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Old 06-28-2022, 11:40 PM   #238
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Then you are at the territory of FI price wise
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