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01-10-2003, 02:36 PM | #1 |
Dirk Diggler
Join Date: Feb 1999
Location: SLOATSBURG, NY
Posts: 1,931
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math help for TB recremendation
i know how to figure out the CFM a motor needs but where do i get CFM ratings for TB's?
motor in question is a 408 with AFR 185's,custom cam,Spider intake(vicjr with elbow for TB and injector bungs welded in) ..those heads wont breathe much above 6200 with 408cu so figure that to be the max RPM..i am guessing in the neighborhood of a 75mm or 80mm..thanks in advanced.. BTW the dyno pull to achive the power that i build "my" combo after was used with a 750cfm demon
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95 undecided cubes, AFR 185s,undecided cam, undecided intake, and a 150 hit 89 "turbonotch" 2.3T You might want to hold on..i saw this on a cartoon once |
01-10-2003, 03:32 PM | #2 |
Registered Member
Join Date: Apr 2001
Location: Staging lane
Posts: 4,337
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Thats one awesome set-up. If it were me I would go with a 80mm TB due to the large displacement of the engine.
Later,
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer |
01-12-2003, 12:16 PM | #3 |
Registered Member
Join Date: Sep 2002
Location: Slave Lake A.B.
Posts: 9
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I found this searching for the same answer.http://snow.prohosting.com/~johngift/intakefab.html .The formula is near the bottom of the page have to convert mm. to inches.hope this helps.
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88 5.0l atrim 8rib pulley stock bottom end ported heads & intake stock.T.B stock. c&l 76mm mass air conv.19lbs inj.vortech fmu 255lph intank. man. vlvbdy.c4.3000tci stall b&mpro rachet. 3.73gears tagirdle. ssm lowers all for $10500can including price of car. |
01-13-2003, 04:38 PM | #4 |
I'd rather be basketweaving
Join Date: Feb 2000
Location: Indianapolis
Posts: 2,551
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the bottom of this page lists some flow data for mass air sensors and throttle bodies.
http://www.kellnet.com/chambers/intake_flow.htm going by this data, and assuming that the diameter is in linear proportion to the flow rate, then here's what a couple other TB's would most likely flow 80mm: ~960CFM 85mm: ~1070CFM is that of any help?
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NMRA O/C 9516 NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft Last edited by fiveohpatrol; 01-13-2003 at 04:44 PM.. |
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