SR20VE conversion w/ EFR7670 low dyno numbers

[RalliartRsX]

jr_ss, if you are available, I am heading to JKTuning Tuesday for a redyno. I got a handle on the boost control issue and made a host of changes from the last time. I am hoping this time yields more positive results. I have to drop a new 12V power source for the Flex sensor, so will be bringing several gallons of E85 as well as doing a pump tune for the track. We will see how things shake out.

Car had the first track day Friday and performed well. I just wish all the heavy hitting machinery actually had some wheelers behind the wheel so I could learn a few more things.

[S14rebuild]

Luvn where this thread is going...good info and awsome popcorn fest!

[RalliartRsX]

Alot of the "good" info is based off of "invalid" assumptions outside of dyno graphs.....

I just read the first page. Another ridiculous and unfounded assumption....

The VE has the exact same VE (cylinder fill) as a standard DE head at 4000 rpm hahahahahhah! Have you even seen the flow numbers on a DE vs VE king? That is a grossly inaccurate assumptions and based off blind ignorance....

Goodluck to you king....you're gonna need it

[jr_ss]

Originally Posted by RalliartRsX

Alot of the "good" info is based off of "invalid" assumptions outside of dyno graphs.....

I just read the first page. Another ridiculous and unfounded assumption....

The VE has the exact same VE (cylinder fill) as a standard DE head at 4000 rpm hahahahahhah! Have you even seen the flow numbers on a DE vs VE king? That is a grossly inaccurate assumptions and based off blind ignorance....

Goodluck to you king....you're gonna need it

I completely missed this...

[Kingtal0n]

Originally Posted by RalliartRsX

Alot of the "good" info is based off of "invalid" assumptions outside of dyno graphs.....

I just read the first page. Another ridiculous and unfounded assumption....

The VE has the exact same VE (cylinder fill) as a standard DE head at 4000 rpm hahahahahhah! Have you even seen the flow numbers on a DE vs VE king? That is a grossly inaccurate assumptions and based off blind ignorance....

Goodluck to you king....you're gonna need it

I guess nobody here understands what Volumetric efficiency is.

Flow rate has absolutely nothing to do with Volumetric Efficiency.
I don't know why you keep quoting flow rate like it has anything to do with torque lol.

I am not the idiot here. You just have no idea what VE means, or how an engine works.

I have proven beyond reasonable doubt that both DE and VE engines/heads have identical VE with my previous post (https://zilvia.net/f/showpost.php?p=...0&postcount=56) showing dyno graphs from both VE and DE engines which produce the same exact torque which = same exact VE.

Sorry but you need to learn more about engines before making these ridiculous posts.

[S14rebuild]

This is why i log on.....

[RalliartRsX]

I'm an aerospace engineer by trade, with a masters.

I've interned at nasa and have worked on gas turbines for a few years.

Nope, not qualified at all lol.

I used that equation to simplify the discussion which I caveated above....

But meh you can continue to state as you wish....

[RalliartRsX]

Ps why are you comparing NA engines when the entire discussion and your dyno are all turbo engines?

Hahahahha!

[RalliartRsX]

Flow rate is in terms of cubic feet per min. The cubic feet is a volume. A volume has a specific mass associated with it like a box of air has a certain associated mass that is occupying the specific volume

The cross sectional flow area between the DE vs VE has changed enough where the VE head can flow more mass of air for a specific volume as due to the flow rate being higher, it can fill a specific volume (cylinder) with more air for a specific time (intake stroke). Hence why I state that a DE does NOT have the exact same VE at a given RPM peak RPM or whatever. The VE can fill the specific 0.5 liter volume at a much faster rate, and hence mass, than a DE during an intake stroke, which is a fixed constant.

If you are pouring water into a 2 liter glass, and you pour one at 2 l/sec and one at .5 l/sec do the glasses fill the exact same amount for a 2 sec pour? Because that's exactly what you are saying above....
The calculation for VE is
VE = (cfm x 3,456) / (c.i.d. x rpm)
So let me ask you this, if a DE flows say 100cfm @ 4000 rpm, and a VE.120, can you explain to me how both engines have the exact same VE if we are assuming 4000 rpm is peak torque or cylinder fill or whatever you call it?

But hey, if I have to extrapolate that idea, then maybe I give you more credit than I should....

[jr_ss]

[S14rebuild]

Ohhhhhhhhhhhhhhh. This is getn good!!

[RalliartRsX]

Ps who the fuck is comparing dyno outside of king? Dyno can all be manipulated and then on the same breath, you like "nope, that dyno isnt right because. Lah blah blah"

So many assumptions, missteps and are sorts of nonsense and king continues to conflate like 100 different....things

[RalliartRsX]

So I really want to harp on this. And I am going to bolt the fuck out of this since king knows it all just for effect

Originally Posted by Kingtal0n

I guess nobody here understands what Volumetric efficiency is.

Flow rate has absolutely nothing to do with Volumetric Efficiency.
I don't know why you keep quoting flow rate like it has anything to do with torque lol.

I am not the idiot here. You just have no idea what VE means, or how an engine works.

.

Originally Posted by RalliartRsX

The calculation for VE is
VE = (cfm x 3,456) / (c.i.d. x rpm)
.

Now, there is a much more nuanced equation which involves the ideal gas law, but for conversation sakes, since king thinks I am calling in an idiot because of his blind ignorance...

Spoiler alert; because you lack the understanding of a topic, DOES NOT mean you are an idiot. Another of your amazing leaps and assumptions....

[RalliartRsX]

Here is the more nuanced equation

m_dot is....FLOW RATE! Specifically mass flow rate......or in terms of an engine CFM.

[RalliartRsX]

Also, in the nuanced equation, you can see the ideas of a turbocharged engine unfolding and how it increases VE (temp rise due to compressing air, pressure drop or rise due to pressured air from the turbo's compressor)

I think I am done on this topic.......

[jr_ss]

Originally Posted by RalliartRsX

Also, in the nuanced equation, you can see the ideas of a turbocharged engine unfolding and how it increases VE (temp rise due to compressing air, pressure drop or rise due to pressured air from the turbo's compressor)

I think I am done on this topic.......

But are you really...?

[S14rebuild]

4 posts in a row...