Originally Posted by Hard AttacK
I'm installing. dp, test pipe, and hollowing our my precats this week and have a spare mbc laying around. I'm wondering if I should play with the boost a little bit (if I even can) or just leave it stock.
The car is bone stock with an intake + y-pipe and boost gauge right now and it spikes about 11 or 12 and holds 9 lbs. It runs great, gets great gas mileage, and I would like to keep it that way for a while. I don't want to hotwire the fuel pump without a afpr and everything because I had bad luckon my other tt doing it without one or a safc.
- its generally accepted that 14 is the TYPICAL safe zone for most cars, some knock at this, some dont.
- you MAY hit fuel cut at 14 psi, most cars dont, mine did, preventing me from revving out fully
either hotwire the stock fuel pump, or swap in a walbro 255 unhotwired- you wont sacrifice any mileage from this- the pump wont be making enough pressure to overrun the system, AAAAAAaaaand guys run a hotwired 255 on the stock fuel pressure regulator with no problems- this INCLUDES MATT M AND RAY P, and for a brief time, myself (until I upgraded to a dual pump- dual feed setup)
get a better recirculated BOV- the stock plastic ones leak, and have a tendancy to cause loss of power- from loss of maintaining boost pressure/ and improper venting. The evo 8/9 bov is an excellent replacement for relatively cheap.
if your down to do a lil extra turbo work to get the most out of your 9bs, port out the step in the exhaust housing to let it breath a little better, it will not do much, but it helps a lil bit if your up for getting into your turbos any....
with your mods listed above and the ones i suggested sans ported 9b's (waste of time in my eyes back then as i was already planning upgrading and throwing them away) I hit 27-28 mpg highway in a 6 spd and roughly 20-21 around town not driving like a hoon. It was a pretty good recipe for me anyway.
Single Hx52 billet 67mm 1300 cfm goodness, Delphi 1250's, twin walbro 400's, dual pump/dual feed braided lines from tank to rails,Tial 50mm BOV, Tial 60mm wg, Spec 4+ with hub welded and balanced, Rays Bellhousing brace, flash ECU with openport 2.0 tune, MSD coils, MSD race ignition wires, Odyssey PC680, CX racing fmic 1000hp core 28x12x4, ABS delete, EGR delete, AC delete, cruise delete, pansy patrol pulley reduction, Vac reduction