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VE and what happens when you put a turbo on

Old 10-24-2003, 03:35 AM
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Default VE and what happens when you put a turbo on

I have the answer to the above. im sort of curious what others have to say. Joseph Davis your not allowed to answer i knwo you know Cuase we spent time talking about it. LOL. one on one at Blundars car party.

anwyasy id like to start quizing you kids to see how smart you are and to see where we as a group can grow.

O VE stand for Volumetric effiecnecy, JIC you didnt know already.
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Old 10-24-2003, 08:46 AM
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Default Re:VE and what happens when you put a turbo on

am I supposed to ask "how high" and jump through that hoola-hoop? who do u think you are.. bill nye?

"lets see how smart u kids are" well if you're such a damn genius why are u asking us questions about your 600+hp car?
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Old 10-24-2003, 10:18 AM
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Default Re:VE and what happens when you put a turbo on

Just another way for tropophobic PGMFI "members" to force thier seemingly intellectual superiority on those they feel are beneath them.

..get used to it.
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Old 10-24-2003, 10:38 AM
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Default Re:VE and what happens when you put a turbo on

PGMFI= Pretty Good Mother ------- Injection im not sure i know or care about the other thing
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Old 10-24-2003, 11:20 AM
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Default Re:VE and what happens when you put a turbo on

GT just delete this topic.. things like this are un-wanted here at HMT in my opinion. We don't be-little each other here.
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Old 10-24-2003, 11:52 AM
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Default Re:VE and what happens when you put a turbo on

So this doesnt play a role in tunning your engine management ? There is an avid lack of discussion here about engine orperating fundementals. There is a lack of that understanding in general throughout the entire tunnign world. As for me asking about my 600hp turbo motor i already know what ive got to do. i was hoping for some input but ahh never mind. im making 250 now at the flywheel with no intercooler on pump gas what could i possiably know.

So here is the disertation you need to read on the subject. Oh and im just sort of a helper when i can at PGMFI With engine theory.

You may ask why do i care what happens to my VE when i put a turbo on. Well it matters.

Lets say you have a mildly tunned b16. it N/a breathing VE is around say 92%. so we know that we have a total CFM consumption of 205 CFM at 7800rpm.

Now that we have extsablished its peak N/A breathing eficency what do you think happens when you bolt the turbine hosuing on the engine ? you drop the VE significantly. how much you say well that depends on the turbine trim and the turbin housing.

in a typical b16 with a .48 turbine housing you will see a static 25% loss in VE in non boost operation. yep i siad 25%. so you ask what does that work out to in terms of HP. roughly speaking. about 30hp right off the bat.

so now what you have is an engine with a %67 total VE at the same RPM. Well you ask how does this play into turbo sizing. Its fiarly critical to understand upfront that you Fuel tables are now going to be roughly %25 to rich at the same RPM at the same manifold pressure.

It also has a definate effect on turbo sizing. your now sizing a turbo for a engine with a 156CFM total VE . so for you to have a meaning Pressure ratio you must have the exact amount of flow you wish to create pressure over for a good runnign engine.

so if we have a total CFM of 156 then to roughly achive say 15psi of boost youll need roughly 300cfm of turbo. thats provided you find a fiarly eficent compressor to use. now what you thinking is what the total VE output at 15 psi of boost.

Well get ready to have you minds blown. itll be roughly 125%.


Well how does this are relate to tunning ? well it does. First of all the factory engine management cannot compensate for this dramatic swing in VE. the fuel tables have to be rescalled etc. secondly you have ot realize that you now have a minum amount of airlfow you have to atian just to get back to the power level your were at before you put the turbo on. typically youll need 3-4psi on most applications. smaller engines usally have a small drop in power vs larger engine when the turbo is installed.

There also another key factor involed in all of this. Ignition timing can and does have an impact on VE. It can also play a pretty criucial role in in TQ production. Im not gonna get into the in/out of this today ill save it for tommorow. But if you think this is a im better then you thing your wrong. i see a blatant lack of I.C.E. understanding here and its most distrubing. I was tyring to make it fun but since you cant maybe ill take the discussion else where.



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Old 10-24-2003, 12:00 PM
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Default Re:VE and what happens when you put a turbo on

Originally Posted by sean88accord
anwyasy id like to start quizing you kids to see how smart you are...
then you need to start thinking about what you say before you say it.
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Old 10-24-2003, 12:10 PM
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Default Re:VE and what happens when you put a turbo on

The honestly SAD thing is, PGMFI has been around working on editors for how long? Ok, well long enough, found out alot of information.. GOOD JOB. But check this out, a new kid comes around, spends hardly any of the time the rest of you have, asked questions and learned quickly, made an editor that anybody can use.. OMG VIN DOOZLE LOVES THIS GUY. GhD is, in hex turns 1001, or in verbal terms, POOP.

VIN DOOZLE ROX UR SOX!
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Old 10-24-2003, 12:11 PM
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Default Re:VE and what happens when you put a turbo on

then you need to start thinking about what you say before you say it.
maybe you should enjoy the challenge instead of having the slacker attitude and covering for it with comments like the ones above. take it as a challenge. prove how much you know. not only will meaningful discussion occur but you could learn alot as well.

just my 2cents.
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Old 10-24-2003, 12:15 PM
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Default Re:VE and what happens when you put a turbo on

its not the quizzing part.. its what you said.. you gotta realize how it sounds too people when a new guy (registered 4 days ago) comes on and says you kids this you kids that. you gotta have respect for people. whether they know as much as you or not. even if they dont want to learn about it, you don't have to be-little people.

Your age very well may be greater then ours.. but it sounds like you have alot of growing up do to.
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