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#1
03-29-2005, 07:17 PM
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boost/mbc question
When I first got my car, it already had a greddy MBC. I used to be able to turn it all the way down to less than 8 psi. Now since gas prices are sky high, I tried turning it down... But now it won't boost anything less than 10-11 with the controller cranked all the way down as far as it can go. Also before to get down to 8 psi I didn't even have to crank it all the way down. anyone have any ideas what's going on here???
thanks --Edit-- forgot to say it before anyone asks... no I'm not going by the stock boost gauge, it's an aftermarket. 
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#2
03-29-2005, 07:33 PM
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Re: boost/mbc question
having your boost turned down to 8 psi won't make a difference on your gas mileage in normal driving conditions. Whether you have it set at 8 or 14, you won't start using more fuel unless you go wide open throttle and you start going past 8 psi, but that takes a second for it to do so. Cruising and normal acceleration boost levels will not affect your gas mileage, this is the beauty of turbos since you have to spool them, which then the MAS sees more air, which then the ECU tells the fuel components to dump more fuel.
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Daily Driver: 2004 Jeep Grand Cherokee Special Edition 1994 Mitsubishi 3000GT SL-TT Automatic - Black 3.05 L Arias Forged Pistons, Pauter Forged Rods, DR Stage 3 heads, 3SX TD05 kit w/ E16G's, CX Racing FMIC, 550cc injectors, Walbro 255lph pump, + supporting mods 1994 Mitsubishi 3000GT VR-4 - Black Intake & Boost Controller so far 2006 Sea-Doo RXP Supercharged, Updraded SC, IC + supporting mods
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#3
03-29-2005, 07:51 PM
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Re: boost/mbc question
Hmm a few thoughts...
1 would be boost leaks which could skew your gauges numbers a bit. 2) possibly a kink or pinch in the boost gauge hose (can cause errors and make it show boost 2-3psi higher) I'd pressure test and check your boost line to make sure it is free flowing.
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96 3000gt vr4 -K&N FIPK -Proboost mbc -Cusco front + rear strut bars -Greddy type-s -ATR downpipe -no cats -15Gs, 3sx aluminum pulley, FMIC, SAFC, walboro pump, EVO 560ccs, and Meth Injection Kit all waiting to go in shortly. Your 1996 Mitsubishi 3000GT VR-4 is the 92nd out of the 315 that were made that year. Only 21 of which are exactly identical.
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#4
03-30-2005, 12:13 AM
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Re: boost/mbc question
vac/boost leak
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A few "bolt on" mods, a couple "cut, smash, hammer, weld, etc" mods, and a couple "why the hell do I need this/what the hell is this" weight reductions.
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#5
03-30-2005, 12:15 AM
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Re: boost/mbc question
Get your intake pressure tested, probably hte first thing you should do once you buy a TT/VR4. Mine had oogles of leaks, all fixed now I think.
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1995 3000GT VR-4 Installed: ESP front precat eliminating downpipe, test pipe, RF-1008 K&N, Dejon tool Y pipe, 1G DSM BOV, MSD wires, Guted rear pre cat, ISSPRO EV Marine boost gauge, IPO MBC, EGR blockoffs, Palm m515 dataloger setup, NGK iridium plugs, SPEC stage II clutch 500ft/lb, 5300k HID plug and play setup. Soon:Topline Engineering ground wires.
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