18 psi on pump gas with my t-78?
well nice discussion there thanks for all the replys, but i still dont now if raising the boost with pump gas will be so dangerous ,i thing will be so what you think about the airplane gas used isntead od the race gas will be same ?or will not make the same effect'
thanks
thanks
multipersonality disorder
Joined: Feb 2002
Posts: 5,656
Likes: 0
From: so. cal
dub, you're still trying to make me look dumb because you don't understand the concept? on top of all the compressor map stuff, you've got to take porting, flow, port timing, etc etc etc into the equation.
why not buy a book or two?
why not buy a book or two?
development
Joined: Aug 2002
Posts: 5,714
Likes: 7
From: Lafayette, LA
Originally Posted by GUITARJUNKIE28
dub, you're still trying to make me look dumb because you don't understand the concept?
on top of all the compressor map stuff, you've got to take porting, flow, port timing, etc etc etc into the equation.
why not buy a book or two?
Junior Member
Joined: May 2006
Posts: 15
Likes: 0
From: Miami
Originally Posted by 13bmaniac
we dont considerer much here the gas mileage since filling the tank full with 95 unleaded gas cost me only 1.75$. is not big deal this is the only country that a gallon of water is more expensive than a gallon o fuel.
.
.
I thought venezuelas gas was not rated in the ron+mon/2 as north america is , and the 95 over there was actually closer to a 91 octane over here. ( ron rating I beleive ) ( but this info is from about 6-7 years ago, And I have heard that venezuela might have changed there fuel rating system as of early 2005.
That could be something to think about.
That could be something to think about.
multipersonality disorder
Joined: Feb 2002
Posts: 5,656
Likes: 0
From: so. cal
Originally Posted by dubulup
practice what you preach...and please finish your education
please begin yours.
Originally Posted by dubulup
hey dave, i didn't understand the way you explained it before because i was having sex with young boys instead of paying attention in class. could you please help me understand a little more?
go get a mass air flow sensor from the junkyard. pay attention to what vehicle it came from and get that vehicle's computer schematic, along with the mass air/voltage reference chart.
use your air compressor and blow through a .005" hole
(90psi regulated).
get your reading.
same thing blowing through a .1" hole
and .125", .15", .2, etc.
what will you notice about the flow as the diameter of the oriface increases? i think you already know the answer to that. the smaller the hole (all other things being equal), the greater the restriction, the less the flow. exactly what problem do you have with extrapolating that to 2.5" and 3" sizes?
allow me to state this once again: pv=nrt
take chem 101, physics 101, and a refresher algebra course at your local jc and you'll understand this concept by next semester.
hey AZAD how is all going over there thanks for the reply and i know you are always there for a good advice,but if you remenber in late 2002 with the oil stop best know as the (paro petrolero)all the fuell parameters where modified adopted only unleaded fuels and premiun ron 91 and 95 octane gas we got both here,but you know that the race gas here is hart to get so were thinking on putting some airplane gas in the fd and put the fd in the 18 20 psi range but we dont know the exactly quality and octane of the gas whe know is far beyond 108 octanes because is the minimun fuel octane delivered for example a cessna airplane, i heard is between the 108 and 115 octanes i think i have to do some research in private airports so i can be sure.
thanks
thanks
development
Joined: Aug 2002
Posts: 5,714
Likes: 7
From: Lafayette, LA
Originally Posted by GUITARJUNKIE28
please begin yours.
why sure, main man. go get a mass air flow sensa from da junkyard. pay attention to wot vehicle it came from and get dat vehicle's poota schematic, along wiv da mass air/voltage reference chart.
use your air compressa and erbal remedy through a .005" batty (90psi regulated). get your readin. same fin erbal remedyin through a .1" batty and .125", .15", .2, etc. wot will yous notice about da flow as da diameta of da oriface increases? i think yous already know da answa to dat. da smalla da batty (all udda fings bein equal), da greata da restriction, da less da flow. pacifically wot problem do yous ave wiv extrapotalin dat to 2.5" and 3" sizes?
allow me to state dis once again: pv=nrt take chem 101, physics 101, and a refresha algebra course at your local jc and you'll understand dis concept by next semesta.
why sure, main man. go get a mass air flow sensa from da junkyard. pay attention to wot vehicle it came from and get dat vehicle's poota schematic, along wiv da mass air/voltage reference chart.
use your air compressa and erbal remedy through a .005" batty (90psi regulated). get your readin. same fin erbal remedyin through a .1" batty and .125", .15", .2, etc. wot will yous notice about da flow as da diameta of da oriface increases? i think yous already know da answa to dat. da smalla da batty (all udda fings bein equal), da greata da restriction, da less da flow. pacifically wot problem do yous ave wiv extrapotalin dat to 2.5" and 3" sizes?
allow me to state dis once again: pv=nrt take chem 101, physics 101, and a refresha algebra course at your local jc and you'll understand dis concept by next semesta.
look, you aboslutely are answering a question no one is even asking. Never did I ask how flow increases with an increased piping diameter, which you seem to be stuck on. I understood what you seem to think you are explaining to me, long before I knew you existed. I AM NOT TALKING ABOUT DIFFERENT PIPING DIAMETERS!!! OR DIFFERENT FLOWING MOTORS...
you seem so insecure about your education you have to try and bash someone on what you believe is true. You know absolutely nothing about most people on this forum and are foolish for assuming you do. I have an engineering degree and have worked on projects that you can only read about. So enough with the education rap.
to break it down further for you...let me rephrase the question so YOU understand what I was asking.
I have ONE turbocharger and ONE engine bay. I make 400rwhp @ 15psi (72% eff), I pull the turbo off and change ONLY the compressor wheel (75% eff @15psi). @ 15psi my new turbo WILL ONLY FLOW MORE AIR DUE TO THE MORE EFFICIENT CHARGE...there is no magic about flow vs PSI in a given system. In your damn PV=nRT equation, the only change is T
having fun yet?
multipersonality disorder
Joined: Feb 2002
Posts: 5,656
Likes: 0
From: so. cal
wrong again.
just because the compressor is more efficient doesn't mean it will flow the exact same rate.
would i be uber-redundant to tell you to look at the compressor maps?
you asked a few questions-which all got answered. nobody can implant this knowledge into your head. you're going to have to study on your own until you get it.
just because the compressor is more efficient doesn't mean it will flow the exact same rate.
would i be uber-redundant to tell you to look at the compressor maps?
you asked a few questions-which all got answered. nobody can implant this knowledge into your head. you're going to have to study on your own until you get it.
Originally Posted by dubulup
I don't think you can even read
I just thought the exact same thing, too funny.(not knocking you Dave) he is asking about a flow increase due to a temperature differential. Ie cooler air = denser air.
-S-
Senior Member
Joined: May 2006
Posts: 597
Likes: 0
From: CO,CA,NV,WA
Originally Posted by BDC
... and this, my friends, is why the rotary community as a whole hasn't come very far... 
B
B
agreed...we have too many intelligent forum members on this forum which have different thoughts about how the engine suppose to be. Zero R did u get my pm?
Originally Posted by A3ON7
agreed...we have too many intelligent forum members on this forum which have different thoughts about how the engine suppose to be. Zero R did u get my pm?
-S-
development
Joined: Aug 2002
Posts: 5,714
Likes: 7
From: Lafayette, LA
Originally Posted by GUITARJUNKIE28
^ you didn't see the questions he asked me via pm. i was referring to parts of that.
I'm having a hard time understanding this statement,
Originally Posted by GUITARJUNKIE28
it's about airflow, NOT psi!
now, I do understand a turbo working more efficiently (compressor map and exhaust backpressure) will make more power at the same 15psi rating but is it really just moving more air due to the cooler air and less exhaust restriction at 15psi?
****. I think I either answered my own question or confused myself even more.
thanks,
carson.
{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\ }{\}{\}{\}{\}
I'm yet to see you [GUITARFLUNKY] anwswer that question, as its a simple yes or no answer.
your response
{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\}{\ }{\}{\}{\}{\}
Originally Posted by GUITARJUNKIE28
let me giv eyou a really dramatic example...
an airless paint sprayer sprays .35 gallon/minute @ 3500 psi.
your air compressor blows 8cfm @ 90 psi
your turbo blows 600 cfm @ 20 psi.
airflow, NOT psi!!!!
you're correct in what you said, however has absolutely nothing to do with my question...so I thought I'd bring it up in the thread in hopes someone could prove that statement wrong or correct.
and what a long strange trip it has been...
development
Joined: Aug 2002
Posts: 5,714
Likes: 7
From: Lafayette, LA
I'm not pissed at you at all
I'm having a hard time understanding this statement, and I have been for awhile, just you posted it today, so I figured I'd ask.
we have a measured PSI just after the TB.
two different turbo's (A & B)pushing air into the same elbow, thru the same TB and down the same UIM.
how can turbo A (say RX6) flow less air thru the same piping as turbo B (say 500R) at the same measured PSI rating (15psi) in the UIM??
I tried to explain the above statement to someone asking about turbochargers and ran in circles...and realized I had no data or real understanding what it is about.
now, I do understand a turbo working more efficiently (compressor map and exhaust backpressure) will make more power at the same 15psi rating but is it really just moving more air due to the cooler air and less exhaust restriction at 15psi?
****. I think I either answered my own question or confused myself even more.
thanks,
carson.
let me giv eyou a really dramatic example...
an airless paint sprayer sprays .35 gallon/minute @ 3500 psi.
your air compressor blows 8cfm @ 90 psi
your turbo blows 600 cfm @ 20 psi.
airflow, NOT psi!!!!
Originally Posted by GUITARJUNKIE28
Originally Posted by dubulup
Originally Posted by GUITARJUNKIE28
yea, but the stock turbo isn't even in the same world as a t78. it's about airflow, NOT psi!
we have a measured PSI just after the TB.
two different turbo's (A & B)pushing air into the same elbow, thru the same TB and down the same UIM.
how can turbo A (say RX6) flow less air thru the same piping as turbo B (say 500R) at the same measured PSI rating (15psi) in the UIM??
I tried to explain the above statement to someone asking about turbochargers and ran in circles...and realized I had no data or real understanding what it is about.
now, I do understand a turbo working more efficiently (compressor map and exhaust backpressure) will make more power at the same 15psi rating but is it really just moving more air due to the cooler air and less exhaust restriction at 15psi?
****. I think I either answered my own question or confused myself even more.
thanks,
carson.
an airless paint sprayer sprays .35 gallon/minute @ 3500 psi.
your air compressor blows 8cfm @ 90 psi
your turbo blows 600 cfm @ 20 psi.
airflow, NOT psi!!!!
You did answer your own question. A 35R will be 68% eff.@20lbs. A 42R will be roughly 78% eff.@20lbs. There is your difference. That or I don't get what your asking. Basically 829CFM is 829CFM how dense it is will be where the difference is. I think dave is talking about a system as a whole and not just the turbo itself and that is where the confusion lies between you two.
-S-
-S-
development
Joined: Aug 2002
Posts: 5,714
Likes: 7
From: Lafayette, LA
Originally Posted by Zero R
You did answer your own question. A 35R will be 68% eff.@20lbs. A 42R will be roughly 78% eff.@20lbs. There is your difference. Basically 829CFM is 829CFM how dense it is will be where the difference is.
-S-
-S-
everyone have a nice weekend
[/discussion] back to your T-78 @ 18psi on pump gas
