MazdaManiac

iTrader: (3)

bump

Phil's 8

iTrader: (3)

Don't like speeking for Ray but I think that it's something he will be working on during a week in July.

09Factor

So Phil, what is your current boost level with the new BPV?
What was the psi diffrential between the old POS BPV and the New Billet BPV?

MazdaManiac

iTrader: (3)

This thread hasn't been bumped in a while.
I was running some logs tonight, looking to smooth the transitions and see the effect of electronically "deleting" the VDI.
Still needs work, but it is essentially a good thing.
Now I need to work on the APV transition.

Here is a snapshot of one of the logs:



I know there are folks in one of the other, more dogmatic threads that are particularly proud of their 330 g/sec MAF datalogs on a car that is producing 330 HP.
Note the peak MAF of 396 g/sec above.
There is actually quite a bit of the power range where the AbsLOAD is over 2.0 and stays there.
This is at 10 PSI, BTW with no belt-driven losses so airflow is airflow.

morkusyambo

By deleting the VDI, do you mean it never opens, or that it stays open all the time??

Brettus

iTrader: (2)

snap
been looking at aux port timing for the last few weeks as well .

https://www.rx8club.com/series-i-major-horsepower-upgrades-93/aux-port-tuning-turbo-164021/


also i opened the vdi earlier instead of deleting it - did not perceive any difference . What benefit do you see in deleting it ?

paulmasoner

iTrader: (1)

you have no apparent interest in putting up dyno plots of YOUR car as is(vs the 3071 upgrade plot you posted) But you can post this stuff all you want, doesnt take long to plot out the HP curve, i should try to deduce the TQ curve next..

Kinda puts things into perspective lol

Brettus

iTrader: (2)

/\ so what are we guessing - 350-360 hp ?

I'm at a loss to see how MM could get that hp at only 10psi though -
310 hp at 9 psi and 350 at 10 - something is whack ...

tubingchamp

iTrader: (3)

MM, I like the *** shot in that picture.. Very tappable.

MazdaManiac

iTrader: (3)

If anyone wants to do the math, they should feel free to do so. Deduction is not the same thing as revelation.
I have not posted my dynos (other than the "typical output" one I generated last year) because I do not feel the need to do so at this time.

Never opens.

Where did you get those numbers? Or, more important, how did you deduce that relationship?

paulmasoner

iTrader: (1)

yeah i knew our position on the dyno thing, i was just blabbering. and i found out real fast when i was trying to learn all the math that i could never get everything factored in correctly, but if you do the best you can, its an approximation... and sometimes that can be more realistic than some dyno plots lol


I'm fairly certain thats not on 10psi. i have no idea what kind of water/meth he's pumping or how that factors in, but disregarding that.

396g/s at about 12.2 AFR and .60 BSFC ----- roughly 420's fly....

Kane

iTrader: (1)

It is 10 PSI - I pulled 360 g/sec with 9 PSI

paulmasoner

iTrader: (1)

well sure, but unless we're playing with some of your magic spray, mass air flow can be used to determine max ceiling, and with a bit more info you can estimate some things


ughhh, i cant keep up with you guys all reminding me that i am making huge guestimations based on a perfect world and leaving out a lot of details.... how about this - i concede to whatever this is, and will jst shut up and be happy having a basic understanding and knowing that it works

MazdaManiac

iTrader: (3)

For the Uh-murican crowd (who eschew metric), 396 g/sec is 52 pounds or 680 CFM.

It was 65°F here. Baro was around 28.85. W/M spraying 85% H2O with the smallest nozzle. Regular old QT 91 octane.

Brettus

iTrader: (2)

I thought if I posted a nice low number it might spur you into divulging your secrets - was worth a crack

MazdaManiac

iTrader: (3)

I thought I was divulging my numbers? (That smiley is for Juan.)

paulmasoner

iTrader: (1)

not biting, see my prevous posts addition.. maybe another day when my mind isnt on a piece of ***** like a vulture circling road kill..

Brettus

iTrader: (2)

too much information ...

MazdaManiac

iTrader: (3)

Well, sorta.
That is why I pointed out AbsLOAD.

Notice how the 330 g/sec in the other thread is only an AbsLOAD of 1.65 or so.
My 396 g/sec is over 2.00.

Think about that relationship.

Not sure I'm following you.
Boost and vacuum are all on the same continuum, if that is what you mean.
A vac reading of zero is really a boost reading of 14.7 while a boost reading of 14.7 is really 29.4.
A vac reading of -17" is really a boost reading of 6.4.
etc.

Brettus

iTrader: (2)

um sure - would be fairly one sided though as I have no idea what you mean

vacuum measured where and when in relation to boost measured where and when ?

paulmasoner

iTrader: (1)

makes sense as thats how and engine ingests air, delta in pressures

MazdaManiac

iTrader: (3)

Well, all things are measured as a differential.

paulmasoner

iTrader: (1)

you cant say things so profound yet obvious, it makes me dizzy

Brettus

iTrader: (2)

ah - i see where you are coming from (crh) and this helps me understand what happened with my aux. port experiment .

MazdaManiac

iTrader: (3)

Check this one out:



Peak MAF of 406 g/sec. Peak AbsLOAD of 205!
Temp had dropped to 48°F. I fiddled with my boost controller. It pushed the peak boost up just a touch to almost 11 PSI, but I raised the duty above 7100 RPM so the mean boost was closer to the peak.
Usually, I lose about 1.5 PSI at 7100 RPM because I don't know how to use my boost controller. lol