30 bucks... Keep it and give me a couple days. I gotta find 30 bucks first lol. What is the max boost I should run on my stock Turbo and engine (besides the K&N FIPK CAI)
__________________
1987 300ZX Turbo, 5 Speed, TurboXS H-34 BOV, WAI, Under Construction
Clutch, Wheels, Tint, Paint, Interior, HID
on the stock turbo-- 45 psi is the max you should run--lol most people seem to be shooting for 10-11 psi- thats what Im shooting for but first I have to find a blow off valve and plug up that damn pop off valve on the plenum
__________________ ONE OF THESE DAYS I'LL FIGURE OUT HOW TO CHANGE MY WIPER BLADES
on the stock turbo-- 45 psi is the max you should run--lol most people seem to be shooting for 10-11 psi- thats what Im shooting for but first I have to find a blow off valve and plug up that damn pop off valve on the plenum
Are you out of your f*cking mind?
45 psi? whhaaatt! Please tell me your joking.
The stock turbo on 300ZX's Z31 and 280ZX's S31 can only handle TOPS 10 psi, intercooled. Now you guys don't have intercoolers, so the MAXIMUM you can run is only 7 psi or you will have detonation and melt your pistons and f*ck your engine.
Blow off valves have nothing to do with how much boost you can run, Blow off valves allow excess air built up in the intake to be released before it hits the throttle plate and reverses to hit the turbo, resulting in slowing down the turbo. Once again Blow Off Valves only release excess air when you let up off the throttle, and does NOT give you more boost.
Plug up the pop off valve? Ohh God, are you people clueless about turbo's and how they work?
DO NOT PLUG THE POP OFF VALVE, you can adjust it, but it is designed to let out dangerous levels or wayyy to much air from entering your engine that doesn't have enough fuel to allow a good combustion cycle. THink about it... 7 pounds per square inch of air in your intake, and only 250 cc of fuel? Ehh NO!
Boost controller's tighten or open the WASTEGATE which allows a certain amount of air to be compressed in the intake. Therefore.. Boost Control.
PrOxLaMuS where are you getting your info? All of you guys where do you get this crap.
First of all without an intercooler the Z31 Turbos can only run safely at 8psi short sprints are capable at 10-12psi but you can not sustain this boost for long. (not seven not 11).
With an intercooler you can run much more then 10psi 12.5 is the max with the stock computer and stock injectors (computer can't run above 12.5 correctly and the injectors are at full cycle) Replace the computer and get better injectors (and a Z32 TT fuel pump) and you can run more then 12.5 about 14-15psi will max out the T3 on the Z31 but then you can just upgrade the turbo and run more boost (I wouldn't recommend running more then 18psi for long periods of time on any engine but if it is tuned properly DON"T LET IT KNOCK you can run more)
Plugging the POV is not a bad idea actually you really need to read up more because PrOxLaMuS I think it is you who knows nothing about turbos just like the other guys writing here.
Also the reason the blow off valve is there is so you don't destroy your turbo with the shock wave that would result if you didn't have it when shifting a manual tranny. During the shift the excess air and pressure would be sent back to the turbo where it would shutter the turbo (yes this is bad very bad for you guys who don't know anything this will eventually kill your turbo).
Disclaimer:
I have simplified my speech so that you all can understand this I hope this wakes you up to your incorrect statements. :dumbass:
Last edited by JAMESZ : Mar 12th, 2004 at 11:12 PM.
The waste gate is a door to allow exhaust air to bypass the turbine. It is opened and closed to modulate how much exhaust gas flows over the turbine and in turn modulates how fast the turbine spins the compressor which, in turn, controls how much pressure is built up in the manifold in area "A". Too much pressurized air entering the combustion chamber can cause premature detonation as the piston compresses the hot high pressurized air. So-called "detonation" can push the piston backwards against the engine's momentum and destroy it. The waste gate is mechanically opened and closed by the waste gate actuator.
The boost controller modulates the waste gate actuator. The input line to the boost controller can be connected to monitor the pressure at "A" in the manifold or alternately to monitor the pressure at "B" at the outlet of the compressor. The boost controller is set to limit the maximum boost pressure. For a stock ZXT the boost controller's set point is fixed at ~6psi but for an intercooled zxt it is typically set to between 10 and 16psi.(more boost means more power from the engine but also increases the risk of detonation).
The pop-off valve is simply an emergency pressure release device to prevent over-boosted air from entering the combustion chamber. It functions by venting the air to the engine compartment when the pressure rises above the maximum boost threshold. For a stock zxt with boost set at 6psi, the pop-off vents at ~9psi. For an intercooled zxt with the boost controller's maximum boost set to 12psi, the pop-off valve would be set to ~ 14psi. The pop-off valve can protect the engine in the instance when the waste gate or waset gate actuator fails. If this were to happen, boost levels could go well beyond 25psi without a pop-off valve present.
The blow-off valve is opened when the throttle valve is abruptly shut to prevent back-pressure on the compressor.
In normal operation, air flows though the compressor then freely into the engine, thus the pressure on each side of the open throttle valve in "A" and "B" is nearly identical. However, immediately after the TB valve is abruptly closed (foot off the gas pedal), the air flow through the engine is nearly brought to a complete halt at the TB. Exhaust air and self-momentum of the turbo wheels continues to spin the compressor. The compressor then continues to pack air into the now sealed area "B". The packing of air rapidly increases the pressure in "B". This high pressure air in "B" causes backpressure on the compressor and slows it down. (a bad thing for performance and it also causes an unusual strain on the compressor). Since the blow-off valve is monitoring the pressure in "A" it can tell when the pressure in "B" is different from that in "A". If this pressure differential is too high, the blow-off valve will open and allow the high pressure air in "B" to vent back in "C". This equalizes the pressure on each side of the compressor thus it spins freely and does not suffer the back pressure problems.
A common mistake is to vent the blow-off valve into the engine compartment rather than re-circulating to the front of the compressor. By venting the air that was "metered" by the AFM, the air to fuel mixture changes and the engine runs rich.
LoL... I may sound like a dumbass to you, but I was manily giving off my information based of off 280ZXT motors the L28eT.
I figured since in 1983 Nissan made the last of the inline 6 turbo engine.. and in 1984-1989 moved onto the 300ZX, I assumed the turbo's were nearly identical.
I assumed not actually looked into it.
JAMESZ how can you tell me where do I get my crap? Explain to me what in my little post was wrong other than the ranges in the maximum and average PSI put out by the stock turbo?
It is a bad idea to plug the pop off valve like I metioned earlier because the pop off valve protects the engine in the instance when the waste gate or waset gate actuator fails. Now why would you risk that?
Incorrect statements? LoL... i don't get it.... why don't look up what i said in both posts and tell me waht was incorrect other than the numbers in the PSI range of the 300ZX turbo?
The waste gate is a door to allow exhaust air to bypass the turbine. It is opened and closed to modulate how much exhaust gas flows over the turbine and in turn modulates how fast the turbine spins the compressor which, in turn, controls how much pressure is built up in the manifold in area "A". Too much pressurized air entering the combustion chamber can cause premature detonation as the piston compresses the hot high pressurized air. So-called "detonation" can push the piston backwards against the engine's momentum and destroy it. The waste gate is mechanically opened and closed by the waste gate actuator.
The boost controller modulates the waste gate actuator. The input line to the boost controller can be connected to monitor the pressure at "A" in the manifold or alternately to monitor the pressure at "B" at the outlet of the compressor. The boost controller is set to limit the maximum boost pressure. For a stock ZXT the boost controller's set point is fixed at ~6psi but for an intercooled zxt it is typically set to between 10 and 16psi.(more boost means more power from the engine but also increases the risk of detonation).
The pop-off valve is simply an emergency pressure release device to prevent over-boosted air from entering the combustion chamber. It functions by venting the air to the engine compartment when the pressure rises above the maximum boost threshold. For a stock zxt with boost set at 6psi, the pop-off vents at ~9psi. For an intercooled zxt with the boost controller's maximum boost set to 12psi, the pop-off valve would be set to ~ 14psi. The pop-off valve can protect the engine in the instance when the waste gate or waset gate actuator fails. If this were to happen, boost levels could go well beyond 25psi without a pop-off valve present.
The blow-off valve is opened when the throttle valve is abruptly shut to prevent back-pressure on the compressor.
In normal operation, air flows though the compressor then freely into the engine, thus the pressure on each side of the open throttle valve in "A" and "B" is nearly identical. However, immediately after the TB valve is abruptly closed (foot off the gas pedal), the air flow through the engine is nearly brought to a complete halt at the TB. Exhaust air and self-momentum of the turbo wheels continues to spin the compressor. The compressor then continues to pack air into the now sealed area "B". The packing of air rapidly increases the pressure in "B". This high pressure air in "B" causes backpressure on the compressor and slows it down. (a bad thing for performance and it also causes an unusual strain on the compressor). Since the blow-off valve is monitoring the pressure in "A" it can tell when the pressure in "B" is different from that in "A". If this pressure differential is too high, the blow-off valve will open and allow the high pressure air in "B" to vent back in "C". This equalizes the pressure on each side of the compressor thus it spins freely and does not suffer the back pressure problems.
A common mistake is to vent the blow-off valve into the engine compartment rather than re-circulating to the front of the compressor. By venting the air that was "metered" by the AFM, the air to fuel mixture changes and the engine runs rich.
LoL... I may sound like a dumbass to you, but I was manily giving off my information based of off 280ZXT motors the L28eT.
I figured since in 1983 Nissan made the last of the inline 6 turbo engine.. and in 1984-1989 moved onto the 300ZX, I assumed the turbo's were nearly identical.
I assumed not actually looked into it.
JAMESZ how can you tell me where do I get my crap? Explain to me what in my little post was wrong other than the ranges in the maximum and average PSI put out by the stock turbo?
It is a bad idea to plug the pop off valve like I metioned earlier because the pop off valve protects the engine in the instance when the waste gate or waset gate actuator fails. Now why would you risk that?
Incorrect statements? LoL... i don't get it.... why don't look up what i said in both posts and tell me waht was incorrect other than the numbers in the PSI range of the 300ZX turbo?
:dumbass:
The problem is it is completely wrong when it comes to the Z31. Yes you did get most of the stuff right about turbos but you posted everything incorrectly (get the facts right before you try to give them out to people) Also detonation won't necessarily destroy your engine and melt your pistons IT WILL BLOW THE HEAD GASKET. An engine will not be destroyed by detonation other things will fail first and light detonation isn't to dangerous but it will do damage over time.
Also you really need to read up on the POV you know nothing about this. It is a waste of money to upgrade the POV and you can really screw it up shimming the spring. If you were intelligent enough to do some research you might have noticed that almost all of the high hp Z31s have no POV (huh wonder why) IT IS NOT NECESSARY. Also if you look at the high performance plenums non of them have a POV it is pluged AGAIN IT IS NOT NECESSARY. I wonder why most people recommend to plug it? HUH if it was such a bad idea why do the performance junkys get rid of it. Also it looks like your just another RICER I mean look at your site I bet that auto 4 door is faster then light and its sad what you did to that 280Z but anyways. YOU NEED TO GET YOUR INFORMATION RIGHT :dumbass:
jesus christ proxlamus, where did you come from man, colorado? How could I possibly run 45 psi-- Im prettty sure I was joking. The pop off valve on the plenum releases pressure at a certain point, How are you supposed to get more boost when there is a valve on the plenum that releases pressure at like 7.5 or 8 psi or whatever it is? See, if you plug that up you can run more boost-- then you get a blow off valve so you dont have compressor surge- where is it stated that a blow off valve gives you more power. You are BassAckwards. Sorry I didnt reply sooner- Ive been busy........obviously not knowing anything and thinking that blow offs give you 100 hp and that I can boost 1,000 psi.
__________________ ONE OF THESE DAYS I'LL FIGURE OUT HOW TO CHANGE MY WIPER BLADES
holy s**t- that dude is really ignorant-- I dont even know how to tell someone that they are that stupid to take something that ridiculous that serious! -- "WOW" is all I have to say. That really Erks me- Im going to go boost 55 psi now.
__________________ ONE OF THESE DAYS I'LL FIGURE OUT HOW TO CHANGE MY WIPER BLADES
Last edited by 0341TODD : Mar 13th, 2004 at 10:28 PM.
what is really sad is that you got completely off the subject and wrote three page threads on how to take a joke wrong and show everyone you're a jerk. For christ sake- cant someone offer poor SKD a solution to his boost controller problem? Wow.............wow Go fix your website.....
__________________ ONE OF THESE DAYS I'LL FIGURE OUT HOW TO CHANGE MY WIPER BLADES
Last edited by 0341TODD : Mar 13th, 2004 at 10:33 PM.
:dumbass:
