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Old 02-13-2008, 09:14 AM   #1
TheShad0w
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Default FPGreen 7cm Airflow

Hey everyone - I'm in the process of tuning a 2.5 litter with an FPGreen w/ supporting mods and a BigMAF(70mm). Car runs great, but I still think its lacking a good amount of airflow. Anyone a 20g+ on a 2.5l w/ a 7cm housing and a BigMAF that I can compare it to. Right now pretty close to redline it is pushing right at or under 300 g/s ~22psi.

Thanks..
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Old 02-13-2008, 11:12 AM   #2
testes1010
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Once you went with the BigMAF you can pretty much quit comparing g/sec to anyone else, because everyone tunes there BigMAFs different.
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Old 02-13-2008, 11:32 AM   #3
TheShad0w
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Quote:
Originally Posted by testes1010 View Post
Once you went with the BigMAF you can pretty much quit comparing g/sec to anyone else, because everyone tunes there BigMAFs different.
I agree with you there, but even prior to going to the BigMAF, it wast exactly moving allot of air IMO.

Last edited by TheShad0w; 02-13-2008 at 09:24 PM.
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Old 02-13-2008, 05:13 PM   #4
testes1010
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What MAFv or g/sec were you seeing before the BigMAF?

If it wasn't maxing out the MAFv(5.0v @ ~352g/sec) on the original intake something isn't right OR the original intake wasn't 'stock' reading.
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Old 02-14-2008, 12:12 AM   #5
TheShad0w
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This stock ECU maxes its MAF at 296/4.69v - which is pretty much on the spot to where it is consistently now. Obviously using a dif voltage since the larger housing, but ~300 g/s.

I found the flow low for its rating - but for the most part every 2.5l I've tuned with aftermarket turbos have had 8cm housings.

Last edited by TheShad0w; 02-15-2008 at 10:14 AM.
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Old 02-14-2008, 09:59 AM   #6
testes1010
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You can rescale the MAF to run upto 5.0v-352g/sec w/o needing to go BigMAF.

Code:
MAF values for stock WRX MAF housing
0.94	0.98	1.02	1.06	1.11	1.15	1.19	1.23	1.27	1.31	1.36	1.4	1.48	1.57	1.65	1.73	1.82	1.9	1.99	2.07	2.15	2.24	2.32	2.4	2.49	2.61	2.74	2.87	2.99	3.12	3.24	3.37	3.49	3.62	3.75	3.87	4	4.12	4.25	4.37	4.5	4.63	4.71	4.79	4.84	4.88	4.92	4.96
1.22	1.4	1.62	1.84	2.14	2.46	2.82	3.2	3.62	4.06	4.54	5.1	5.76	6.98	8.34	9.86	11.54	13.42	15.52	17.92	20.64	24.46	27.94	31.68	35.78	42.56	50.1	58.4	67.38	77.06	87.6	99.2	111.84	125.52	140.2	156.04	173.08	191.42	211.12	232.3	254.98	278.52	295.64	313.26	322.44	331.82	342.66	352.02
Readup, I've done this on many cars & its works flawlessly:
http://forums.nasioc.com/forums/show...light=300g%2Fs
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Old 02-14-2008, 10:49 AM   #7
TheShad0w
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Yeah I have done this too - but the client wanted room to grow..
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Old 02-14-2008, 03:33 PM   #8
Turbo_Mike
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If he wanted room to grow shoulda gone with a 8cm lol
Every MAF sensor reads differently, so its really not something you can accurately compare to, even between people who also have a big MAF. If your air fuel targets are on, timing is good, airflow reading isnt erratic, and its making power, thats what counts.....
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