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oh btw that last post was 666 of yours
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Originally posted by Sesshoumaru p1v1=p2v2 only holds true if the intake temps are the same pv=nrt so when i meant comparing the turbos i was talking at same temps too. if the temps were teh same at the tb and the pressure was the same and the volume was. yeah i'll buy it :) basically i think the point im trying to make is that i feel you would be better off with some bnr stage 3's because of the faster spoolup, unless your trying to run like 34psi :biggrin: |
Rotormotor, there are quite a few more factors involved in detonation than octane and boost. I run 17.5 psi on 91 octane all the time, it is all about having enough fuel and cooling the air. There is not limit, I would say, if you can keep air temps down and have enough fuel.
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ebb there are more than that too. like timing and diminishing returns.
i could go either way for turbos. Depends on the application. I like the fact there is only one to break on a single or wear out :) but spool is always a big concern for me twins can easily put down the power of a single. It depends on the turbos and that is what i was getting at. it's all about the flow........ |
There are no diminishing returns as long as you maintain the cool air temps. timing is definitley a factor, but my point was octane rating is not keeping people from running high boost. If you cannot make the boost you want while keeping temps inline, time for a bigger turbo-its out of the efficiency range and just putting out heat.
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ugh........matter can only be compressed so much
that oxygen - the closer he get's to his buddy the more he hates him. Therefore you have to persuade him even harder........then he hates u more and pushes back.....and u push harder.....he pushes harder back........ just like electrons and protons........ shit sometimes just don't want to fit in the suitcase and without break'n the damn hinges or causing a black hole it's not going to fit. the work u get for taking that extra toothbrush is just not worth the 1hr it takes u jumping up and down on that suitcase. |
I don't think any of us have to worry too much about that. 15-25 psi is nothing, just look at cars running 50-75 psi like the old cart cars.
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I am sorry, I do not disagree with you. There is a theoretical limit, just we don't even come close. How are all the high horsepower rx7's making it?--more boost, bigger turbo.
What is the point of diminshing return on an rx7? Tell me so I can aim just shy of it. I once read of a buick running a 7 second 1/4 at 45psi. |
it's like the superchargers that take 200hp to run but make 1000hp.
There is no definate boundry but for every dollar you put in u get less and less back but i guess there's no point in arguing since were not using laws of thermodynamics. pv=nrt is why it wont' work and were not even on the quantum level yet. Why doesn't air stay at 12psi if there are no opposing forces or so far away from them that it doesnt' matter? They are opposing each other on a molecular level and that is why we are at 1 atm now. Even at low pressures it apparent they repel. We are entering the world of charge nuetrality and i dont' have another argument left in me. i guess that's all i can say unless i use cryogenically hardened squirrel turds submerged in liquid nitrogen to cool intake temps. but i can get those for free :) |
Maybe this is a stupid question... But is the location of the stock bov in a bad place? I would think that Mazda would have put it on the side of the IC closer to the engine than the turbo. When you have all that air in the IC pipes and IC itself, you release the throttle under high boost, and all of that is still in the piping.
I was thinking that's why most all aftermarket bov's are on the out side of the IC. So it releases more air in the system. |
Originally posted by ebb Rotormotor, there are quite a few more factors involved in detonation than octane and boost. I run 17.5 psi on 91 octane all the time, it is all about having enough fuel and cooling the air. There is not limit, I would say, if you can keep air temps down and have enough fuel. |
Originally posted by RotorMotor then will someone please explain to me why premium gas exists? why didnt mazda just tune it properly to run on 87 octane??? :rolleyes: |
if it was it prolly wasn't explained very throughly.
i don't remembering anything about flash points. i think there are some nice threads on the 2nd gen section not sure on the 3rd or not. prolly. basically the higher the rating the higher the flash point and harder the fuel is to ignite. This resiliance to unwanted combustion due to heat (higher flash point) is what makes it good for high boost applications where heat is present. you can actually lose hp by using higher octane. The NA guys never run premium b/c of that. I beleive this is due to the complete combustion of the fuel due to the lower flash point. |
Originally posted by wiblergt to end the thread... the three reasons an upgraded BOV would be necessary... 1. defective stock BOV 2. you are using a turbo the size of an aircraft carrier 3. you want to make high schoolers squeel |
i liked this one actually
Ass crap might be a hazard in cow farting situation |
Its still hasn't been answered... the original question was show me i did a good thing by buying it...Well prove to me the compressor surge is doing damage to the turbine blades or shaft... Why did turbo F1 days never use them (60+ psi) ? Why did saab invent them just to keep it quiet for the everyday motorist? Prove shaft speed slows down excessively with backlash of air? What testing has been done to prove the need for a $100-$400 peice of shiny alloy... Just want to keep this open as no proof has been given...Has anyone had a turbo fail just because no BOV?
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It has been answered. Basically you wasted your money buying it because teh stock one does the job plenty well. Read the thread again and you will see that.
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Originally posted by Sesshoumaru ugh... psi is relative look at a garden hose there is a nice steady flow of water......... but u want more force b/c you tires on your car are really dirty....... so u put your thumb over the end. This decreases the area and increases it's velocity which is realated to the force or "psi". It hits the car so hard it splashes on your shoes :( The same amount of water is flowing through the hose. Just at a different psi. a larger turbo has a bigger "hose" so it can flow more at the same psi. It's all about the size of the hose my friends.......... https://www.rx7club.com/showthread.p...ighlight=turbo |
maxcooper sums it up in the last thread very well!
"12 psi in the manifold is 12 psi in the manifold, no matter what turbo is pumping it there. The single makes more power for two reasons: - The 12 psi in the manifold from the single is cooler than the 12 psi from the stock turbos. - The 12 psi in the manifold from the single is fighting less pressure in the exhaust system to enter to the combustion chamber, so you flow more with the freer-flowing exhaust afforded by the larger turbo (and less convoluted exhaust manifold)." |
Originally posted by Sesshoumaru if it was it prolly wasn't explained very throughly. i don't remembering anything about flash points. i think there are some nice threads on the 2nd gen section not sure on the 3rd or not. prolly. basically the higher the rating the higher the flash point and harder the fuel is to ignite. This resiliance to unwanted combustion due to heat (higher flash point) is what makes it good for high boost applications where heat is present. you can actually lose hp by using higher octane. The NA guys never run premium b/c of that. I beleive this is due to the complete combustion of the fuel due to the lower flash point. flash point is all about pressure and heat right? so are you trying to tell me that if i had a nice cold intercooler i could use 87 in my FD with not a worry???? im pretty sure pressure has alot to do do with it :wink: |
well yes.
that's what i meant by psi, tb, and temp have to be the same 12psi is 12psi just like an 6 inches is 6 inches. i'm not debating that. the reason 12psi isn't always the same power is b/c the temp in the pv=nrt. His sentence referse to PSI only. He says nothing about volume or temp. Since the temps are usually larger for a smaller turbo and have the same psi the volume would have to be decreased basically you have a ration since nr are constants. p=nrt/v and the reason bov are not put in is b/c they get new turbos every race so they dont' give a shit. |
i never said this
you CLAIM that there's not a problem w/ pre-detonation @ 20psi on 91 octane (or that it is not a problem if the car is tunes for it).... |
^i appologise Sesshoumaru! the octane stuff was directed at ebb.
ebb-> "Rotormotor, there are quite a few more factors involved in detonation than octane and boost. I run 17.5 psi on 91 octane all the time, it is all about having enough fuel and cooling the air. There is not limit, I would say, if you can keep air temps down and have enough fuel." |
ok i'll take that back
volume is constant so the n is changing (under motor environment) pv=nrt pv/rt=n so if we keep pressure the same and the volume. and are able to lower the temp. You gain more o2 and more power. |
Originally posted by cavellm Maybe this is a stupid question... But is the location of the stock bov in a bad place? I would think that Mazda would have put it on the side of the IC closer to the engine than the turbo. When you have all that air in the IC pipes and IC itself, you release the throttle under high boost, and all of that is still in the piping. I was thinking that's why most all aftermarket bov's are on the out side of the IC. So it releases more air in the system. Before the IC and After the IC Before IC, Since pressure builds at the trottle body when it's snapped shut the wave has to build back all the way through the IC and esape before it hits the Turbo.. Pro: You're not cooling the air (IC) you're letting out into the atmosphere Con: Pressure builds at the TB and why wait till it almost gets to the turbos, let it off where it builds... After IC: Pro: Pressure gets vented at the place it builds, and has no negative effect on any of the systems from TB back to Turbo Con: You're letting air escape that has been cooled by your IC, and your IC needs to get rid of that heat. Some people put two BOV's in to get the best / worst of both worlds, at a diminished Con. As for the stock BOV, all I have to say Is when you start modding, all the if it was good enough for mazda crap goes out the window since you're re-designing teh system, you can't take out the foundation of a building and expect the static to work with a new foundation... -DC |
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