boost ?

[ajluvsboost]

i have a 95 gsx. just rebuit the motor, stock ecu, stock fuel sysem, and put on a new turbo (big t28) and onlly boosting 12 psi. would unplugging the map sensor, eliminate boost cut, and allow me to go past 17psi?

 

[JEFFREYCASTGSX]

You obviously have a way to go, for starters there isnt a single car out there with the ability to unplug the map sensor and be able to run more boost. Our cars have MAF's not map. Are you experiencing boost cut? Are you sure its boost cut? Your car is fine at the stock boost level with that turbo but you WILL need a way tune and datalog, and upgrade to a at least a 190lph fuel pump when you start to turn up the boost

 

[MLutin]

if your using the stock fuel I wouldn't touch the boost at all. What other mods do you have? Any Air/Fuel controllers?

 

[MLutin]

Even if you had boost cut unplugging the MAF I don't even think it would start. I never tried I guess. Try looking into some supporting upgrades before you think about raising your boost.

 

[oVaBoost]

if you unplug your maf i think the car will run like shit and will only be able to run up to 2500rpm iv done it on accident and it would cut off at 25-3k rpm you can run 14lbs but then again its not a t25 i would leave it alone until you got fuel and afc and supporting mods

 

[ajluvsboost]

no i havent hit boost cut yet ### im only at 12psi but ive heard bout it... my mods: big t28, 3'' downpipe, 2.5'' exhaust, gapless second piston rings, arp main studs, arp rod bolts, fmic, hard piping, gredy type rs bov, intake, fidanza 2.1 clutch kit, commetic 3 layer head gasket, i cant think of much else. my aem wide band read between 11.0:1 and 12.5:1 at idle and 10.0:1 at wot. im running pig rich so thats why i was thinking bout upping the boost ### i think im am getting enough fuel. i was around 15psi on the t25 before the build.... and yes our car does have a map. its on the intake manifold. we have both maf and map. my theory was: since the maf meters the airflow, and the map meters pressure, the only thing telling the pcm how much psi is being forced into the intake manifold/combustion chamber would be the map sensor/baro sensor. our cars can run without it plugged in i heard. so unplugging it would eliminate the pcm from enableing boost cut at 17psi..... my theory may be flawed, but it was just an idea.

 

[JEFFREYCASTGSX]

no i havent hit boost cut yet ### im only at 12psi but ive heard bout it... my mods: big t28, 3'' downpipe, 2.5'' exhaust, gapless second piston rings, arp main studs, arp rod bolts, fmic, hard piping, gredy type rs bov, intake, fidanza 2.1 clutch kit, commetic 3 layer head gasket, i cant think of much else. my aem wide band read between 11.0:1 and 12.5:1 at idle and 10.0:1 at wot. im running pig rich so thats why i was thinking bout upping the boost ### i think im am getting enough fuel. i was around 15psi on the t25 before the build.... and yes our car does have a map. its on the intake manifold. we have both maf and map. my theory was: since the maf meters the airflow, and the map meters pressure, the only thing telling the pcm how much psi is being forced into the intake manifold/combustion chamber would be the map sensor/baro sensor. our cars can run without it plugged in i heard. so unplugging it would eliminate the pcm from enableing boost cut at 17psi..... my theory may be flawed, but it was just an idea.

Our cars have a MDP not a MAP. Its there to check the egr, and check for boost leaks. The only way we measure air is the MAF, and you cant just add boost to lean it out. Get a logger/tuner, injectors, fuel pump, and then you can turn up the boost. Until then leave the boost there.

 

[the_mork]

What have you done to your fuel system to make it run rich at idle? Your WOT fuel ratios are just fine. The car comes tuned from the factory for about a 10:1 AFR at WOT

The MDP on our cars (as mentioned we don't have a MAP sensor) is a 1bar sensor. It can't even read boost pressure it only reads how much vacuum is in the intake manifold. It is only useful for monitoring EGR function.

It is a common misconception that upping the boost will lean a car out or that lowering it will richen the car out. This is absolutely false and just isn't how cars work. The only time that this is true is when you are pushing a fuel system to its limits and by the time you're doing that then you are asking for catastrophic failure.