turbo question

why doesnt a turbo spoon when the car is in neutral?

why doesnt a turbo spoon when the car is in neutral?


spoon? i didnt know a turbo spooned.

:eek7: Turbos don't spoon when they are in gear. I believe they spool, but they don't spoon, fork, or even knife.

yeah yeah yeah spool... but why dont they spool out of gear, the engine is still making exhaust?

yeah yeah yeah spool... but why dont they spool out of gear, the engine is still making exhaust?

it does spool, but at a very very slow rate.

theres nothin to to keep the pressure in. the engine can rev up freely so the pressure doesnt build. can someone back me up or am i wrong???

theres nothin to to keep the pressure in. the engine can rev up freely so the pressure doesnt build. can someone back me up or am i wrong???

i dont understand your statement, "theres nothing to keep the pressure in". what do you mean by that?

if you rev the engine in neutral, you WILL build boost and that turbo WILL spool.

this is my logic(not proven, just logic). the engine is producing exhaust(yes very little, but it is producing some). the exhaust coming out of the engine will spin the turbine wheel of the turbo(basic turbo operation). since there is very little exhaust being created, then the turbine wheel is spinning very slowly. since the compressor wheel is connected to the turbine wheel, if the turbine wheel is spinning, then the compressor wheel is spinning.

thats my logic of a turbo sitting at idle. can somebody tell me if i am wrong?

Sound about right to me

im not sayin it doesnt spool, it does. what im sayin is it doesnt build boost becuz theres no load on the engine, without any load, the boost cant build.

^^ yeah, when there is a load on the engine, its easier to spool the turbo, without a load the engine rev's up too fast to build boost where you think it should be

^^ yeah, when there is a load on the engine, its easier to spool the turbo, without a load the engine rev's up too fast to build boost where you think it should be

if the turbo doesnt build boost when revving in neutral, then why does the BOV release air?

becuz when u let off the the throttle the turbo is still spinnin. so since the throttle is closed the vacuum opens the BOV and the pressure that is now building up in the intake pipin get blown off.

becuz when u let off the the throttle the turbo is still spinnin. so since the throttle is closed the vacuum opens the BOV and the pressure that is now building up in the intake piping get blown off.

becuz when u let off the the throttle the turbo is still spinnin. so since the throttle is closed the vacuum opens the BOV and the pressure that is now building up in the intake pipin get blown off.

first thing...

boost = pressure

if the turbo is building pressure in the intake, then its building boost.

first you said that pressure doesnt build b/c theres no load on the engine when revving in neutral. but then you said that, once the throttle body closes, the pressure that is building is vented by the BOV. so which one is it? not trying to argue, just trying to get you to clarify what you are saying.

ok to start from the begining. the car is in nuetral and u rev it up opennin the throttle, the air is blown into the engine but its is not buildin pressure becuz there is no load on the engine. when u close the throttle, the air that was gettin blown into the engine now has no where to go becuz the throttle is closed. the vacuum in the in intake manifold opens the BOV and the air that had no where to go before (becuz the throttle closed) now blows out the BOV. i hope that clarifies it, im not to good at explaining.

ok to start from the begining. the car is in nuetral and u rev it up opennin the throttle, the air is blown into the engine but its is not buildin pressure becuz there is no load on the engine. when u close the throttle, the air that was gettin blown into the engine now has no where to go becuz the throttle is closed. the vacuum in the in intake manifold opens the BOV and the air that had no where to go before (becuz the throttle closed) now blows out the BOV. i hope that clarifies it, im not to good at explaining.

what im looking at is, when a turbo car revs the engine in neutral, the boost gauge shows that boost is being generated

when you say its not building pressure, you are saying that its not building boost, correct? i want to make sure we are talking about the same thing here

Im new to thew forum and im wondering. when i rev up my engine in gear or not. the boost gauge will climg up then slowly go back down again at normal driving speeds. and i cant get my BOV to blow off, which makes sence because of lack of pressure. but when im racing the boost is there and i can feel when the rubo kicks in. Oh yeah the car is a 88 nissan 300 zx shiro z. 2 things come to my mind. either A. a gasget is broke somewhere or a hose or clamp is broken causing a leak in my pressure. or B my intake filter is damn plugged and not pullin air in or something of that nature. any ideas or ways to fix would be appreciated

Im new to thew forum and im wondering. when i rev up my engine in gear or not. the boost gauge will climg up then slowly go back down again at normal driving speeds. and i cant get my BOV to blow off, which makes sence because of lack of pressure. but when im racing the boost is there and i can feel when the rubo kicks in. Oh yeah the car is a 88 nissan 300 zx shiro z. 2 things come to my mind. either A. a gasget is broke somewhere or a hose or clamp is broken causing a leak in my pressure. or B my intake filter is damn plugged and not pullin air in or something of that nature. any ideas or ways to fix would be appreciated

what type of BOV are you using? stock or aftermarket? some aftermarket BOV are made to be silent. also, are you blowing to the atmosphere or recirculating back into the intake pipe?

enygma500 - you must be on stock bov, it goes off but u cant hear it.

Turbo spools at the max of 1-2 psi from my experience on neutral.

its an aftermarket one with a pretty big whistle, and its not a recirculating one. i have it all hooked up right and everything. hell I even hear alot of whistle from the turbo now but i dont hear blow off when i shift. i know how they work too but its not doing it, i was thinkin i just got a blow off valve too big for the stockj pressure and maybe with a boost controller i could make it make some noise. also when im driving nicely the boost on the pressure gauge will go up then slowly come back down is that a leak somewhere or is thats what supposed to happen

its an aftermarket one with a pretty big whistle, and its not a recirculating one. i have it all hooked up right and everything. hell I even hear alot of whistle from the turbo now but i dont hear blow off when i shift. i know how they work too but its not doing it, i was thinkin i just got a blow off valve too big for the stockj pressure and maybe with a boost controller i could make it make some noise. also when im driving nicely the boost on the pressure gauge will go up then slowly come back down is that a leak somewhere or is thats what supposed to happen

how much boost are you running?

yeah i found out thats prob what my problem is. i guess the stock boost on my car is only like 1-2 psi. So im getting my buddy to make me a boost controller. but still nothing i have read answered my question about my intake pressure. if i hold the gas at an high enough rpm to get boost out of the turbo and watch my boost guage for some reason pressure will drop. im not sure if this is normal turbo stuff or not. but when i give er shit and race i dont lose any pressure it stays constant and i can feel when the turbo starts goin so i know the turbo is spooling good