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should my boost gauge drop to 0 when i shift?
for some reason whenever i shift, my boost gauge doesn't fall to 0 like i normally see on operating boost gauges. what could cause this?
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Re: should my boost gauge drop to 0 when i shift?
When you shift you let off the throttle which closes the throttle plate and doesn't allow boost to pass the throttle body. Its normal. Unless you power shift.
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Re: should my boost gauge drop to 0 when i shift?
where you have the line hooked up at???????
Should drop to 20 in/mg vacuum when you shift...... |
Re: should my boost gauge drop to 0 when i shift?
Haha not mine Bone.
Pegged at 10+ |
Re: should my boost gauge drop to 0 when i shift?
yes, teh lack of boost is normal when shifting. It goes right back up when you floor it again.
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Re: should my boost gauge drop to 0 when i shift?
Originally Posted by Mista Bone
where you have the line hooked up at???????
Should drop to 20 in/mg vacuum when you shift...... |
Re: should my boost gauge drop to 0 when i shift?
like I said, depends on where the gauge is hooked up at...........
Mine is AFTER the throttle body, connected to the FPR line, 20-22 in/mg vacuum |
Re: should my boost gauge drop to 0 when i shift?
its called a functioning blow off valve draining the system of pressure so as to not cause surging. 8)
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Re: should my boost gauge drop to 0 when i shift?
Originally Posted by B16CRXT
yes, teh lack of boost is normal when shifting. It goes right back up when you floor it again.
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Re: should my boost gauge drop to 0 when i shift?
For best performance use a bov non recirculated, sending the same air thru the turbo again heats it up more than the ambient air and thus a small decrease in performance. The bov also lets the turbo keep spinning no-load in between shifts reducing lag, if there was no bov, the sharp pressure increase when you snap the throttle shut will slow the turbo right down like crazy, or actually stall the wheel and somtimes reverse it momentarily... that is surge
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Re: should my boost gauge drop to 0 when i shift?
not trying to steal your post.... but
not to argue or anything but why would almost all oem turbo cars have a recurculated bov system if it didnt decrease lag? think about it, all that pressure lets say 10 psi goes out the bov as soon as the manifold hits vacume, its being waisted on an uncirculated bov system. the same principles that go into turbochargeing (not waisting vauable energy to increase effiecny) are applied to a bov system that recurculates in order for the positive air pressure to enter the turbine inlet allownig it to work less, because the energy that it needs to keep whatever psi your w/g is set at is less because the air is already pressurized, so your turbo would only have to push an extra say 4 psi after you hit the gas again. if you put 10 psi in from the turbo back into the turbo, its going to help keep the turbo spinning longer wich will reduce lag time. yeah it might not sound cool but whatever. yeah its true it may heat the air up more, because the ambiant inlet tempature is increased. but if you have a good i/c and your haulin ass down the freeway the chargepipe temps are going to be close to ambient, so if your bov was set after the i/c it wouldnt matter so much unless your no a dyno or somethin w/o any fans to keep it cool. anyways, im not trying to argue i just dont like seeing statements like that, when companys have spent trillions of dollars in research to make a turbochargeing system as efficient as possible and reduceing lag (while keeping it safe). i doubt many people w/o an engenerring degree can out do them. i say its best to look at thier work and build off of it. Sean |
Re: should my boost gauge drop to 0 when i shift?
Originally Posted by d0nfry
Originally Posted by B16CRXT
yes, teh lack of boost is normal when shifting. It goes right back up when you floor it again.
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Re: should my boost gauge drop to 0 when i shift?
Originally Posted by rexsk8er
not trying to steal your post.... but
not to argue or anything but why would almost all oem turbo cars have a recurculated bov system if it didnt decrease lag? think about it, all that pressure lets say 10 psi goes out the bov as soon as the manifold hits vacume, its being waisted on an uncirculated bov system. the same principles that go into turbochargeing (not waisting vauable energy to increase effiecny) are applied to a bov system that recurculates in order for the positive air pressure to enter the turbine inlet allownig it to work less, because the energy that it needs to keep whatever psi your w/g is set at is less because the air is already pressurized, so your turbo would only have to push an extra say 4 psi after you hit the gas again. if you put 10 psi in from the turbo back into the turbo, its going to help keep the turbo spinning longer wich will reduce lag time. yeah it might not sound cool but whatever. yeah its true it may heat the air up more, because the ambiant inlet tempature is increased. but if you have a good i/c and your haulin ass down the freeway the chargepipe temps are going to be close to ambient, so if your bov was set after the i/c it wouldnt matter so much unless your no a dyno or somethin w/o any fans to keep it cool. anyways, im not trying to argue i just dont like seeing statements like that, when companys have spent trillions of dollars in research to make a turbochargeing system as efficient as possible and reduceing lag (while keeping it safe). i doubt many people w/o an engenerring degree can out do them. i say its best to look at thier work and build off of it. Sean |
Re: should my boost gauge drop to 0 when i shift?
Originally Posted by sixsick6
Well said. Unfortunately, the ricers still don't seem to get it. The best system is a recirculating system, BUT, you have to pick your valve based on the system that you're running. A blow off valve does absolutely NOTHING performance wise, NOTHING. Whether a BOV does anything "performance wise" depends entirely on your definition of performance. I'm guessing your statement concerns the people who upgrade the BOV on their car when the rest of it is totally stock, which is fair, I know a few of those. I grabbed a BOV and DSM sidemount off the same guy when he bought a new BOV and a new interf00ler, for his otherwise stock 2G DSM ::)
Originally Posted by rexsk8er
im not trying to argue i just dont like seeing statements like that, when companys have spent trillions of dollars in research to make a turbochargeing system as efficient as possible and reduceing lag (while keeping it safe). i doubt many people w/o an engenerring degree can out do them. i say its best to look at thier work and build off of it.
Sean Cheers, Brett |
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