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Old 04-27-2013, 09:17 PM   #1674
Alaskan EJ20
Scooby Specialist
Member#: 160040
Join Date: Sep 2007
Chapter/Region: AKIC
Location: Anchortown
2002 Bugi / 1993 L
Symmetry Tuning


Originally Posted by Frmrbob View Post
Thanks man ya maybe trying to have an install party or something soon still need to find out in the Meth kit still haven't decided on that yet was looking at the Aqua Mist HSF4 or HSF3 but not sure about the Jet size ill need
what turbo and injectors, you want your jet or jets to match 30-50% of fuel flow at wot.

So if your using a vf 39 with 650cc injectors and your at 65% duty at wot:

650 x 4 (you have 4 injectors)= 2600cc (but only at 100% duty) so 2600x.65 (65% duty cycle)= 1690cc (full fuel flow at wot). Then 30-50% or 1690cc would be your jet size. so jets that would flow 500cc-800cc would be ideal.

Now keep in mind boost aswell, alot of these meth pumps flow at 150psi, but if your running 22psi in the intake manifold then that counters the meth pump output, so 150psi-22psi= 128psi, so you have to get a jet that flow 500-800cc when the pump flow pressure is at 128psi.

lmk if i can help.
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Last edited by Alaskan EJ20; 04-27-2013 at 10:07 PM.
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