The Ultimate FA20 ITB thread. - Page 17 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Tokay444 · 10-11-2020, 09:29 PM

54mm should be the minimum.

Turdinator · 10-11-2020, 09:41 PM

Quote:

Originally Posted by Tokay444

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.

Tokay444 · 10-12-2020, 11:15 AM

Based on wanting make any real gains.

PulsarBeeerz · 10-12-2020, 01:54 PM

Quote:

Originally Posted by Turdinator

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..

x808drifter · 10-12-2020, 02:38 PM

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/

Tokay444 · 10-12-2020, 10:18 PM

Lol.

botbs · 06-25-2022, 04:12 PM

cyde01 · 06-28-2022, 03:36 AM

Quote:

Originally Posted by botbs

They needed a motec ecu to get it to work

Drifter X · 06-28-2022, 03:39 AM

Quote:

Originally Posted by cyde01

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.

Sent from my iPhone using Tapatalk

blsfrs · 06-28-2022, 08:47 AM

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.

churchx · 06-28-2022, 10:21 AM

Just install 4 sensors

blsfrs · 06-28-2022, 12:47 PM

Quote:

Originally Posted by churchx

Just install 4 sensors

Easier said than done. (IMHO)

churchx · 06-28-2022, 11:32 PM

Obviously. Kind of trolled a bit

Teseo · 06-28-2022, 11:40 PM

Then you are at the territory of FI price wise

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10-11-2020, 09:29 PM	#225
Tokay444 Anti stance. Join Date: Feb 2016 Drives: 17 White 860. RCE Tarmac 2. RE-71RS Location: Not Canada Posts: 1,630 Thanks: 897 Thanked 958 Times in 547 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	54mm should be the minimum.

10-12-2020, 11:15 AM	#227
Tokay444 Anti stance. Join Date: Feb 2016 Drives: 17 White 860. RCE Tarmac 2. RE-71RS Location: Not Canada Posts: 1,630 Thanks: 897 Thanked 958 Times in 547 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Based on wanting make any real gains.

10-12-2020, 02:38 PM	#229
x808drifter LMGTFY Join Date: Mar 2016 Drives: 13 FRS, 91 Miata Location: Lava Town, HI Posts: 2,776 Thanks: 5,561 Thanked 3,646 Times in 1,625 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	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/

10-12-2020, 10:18 PM	#230
Tokay444 Anti stance. Join Date: Feb 2016 Drives: 17 White 860. RCE Tarmac 2. RE-71RS Location: Not Canada Posts: 1,630 Thanks: 897 Thanked 958 Times in 547 Posts Mentioned: 10 Post(s) Tagged: 0 Thread(s)	Lol.

06-25-2022, 04:12 PM	#231
botbs Senior Member Join Date: Aug 2012 Drives: 18 BRZ tS, 27 GRMN 86 Location: Canada Posts: 455 Thanks: 444 Thanked 289 Times in 137 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)

06-28-2022, 08:47 AM	#234
blsfrs Senior Member Join Date: Dec 2018 Drives: 2013 frs base Location: central Virginia Posts: 1,115 Thanks: 1,729 Thanked 912 Times in 473 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	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.

06-28-2022, 10:21 AM	#235
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,333 Thanks: 696 Thanked 2,085 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	Just install 4 sensors

06-28-2022, 11:32 PM	#237
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,333 Thanks: 696 Thanked 2,085 Times in 1,436 Posts Mentioned: 53 Post(s) Tagged: 1 Thread(s)	Obviously. Kind of trolled a bit

06-28-2022, 11:40 PM	#238
Teseo Senior Member Join Date: Jun 2014 Drives: frs Location: Gunsai Posts: 4,877 Thanks: 7,150 Thanked 2,922 Times in 1,769 Posts Mentioned: 23 Post(s) Tagged: 2 Thread(s)	Then you are at the territory of FI price wise

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