drive pressure

[sweetdiesel]

would installing a gauge in the exhaust manifold help to determine
Drive Pressure?

i was foolin around with the computer yesterday and built a exhaust
gas flow rate chart,using vane postion upstream pressure downstream pressure and downstream temp plus tubo inlet diameter

useless knowlege probably but thought i would ask

 

[JOHNBOY]

Actually it should give us some really good info. I really hope to do a drive oressure gauge myself. I am real curious how things like different exhaust housings effect the pressure.

 

[sweetdiesel]

Actually it should give us some really good info. I really hope to do a drive oressure gauge myself. I am real curious how things like different exhaust housings effect the pressure.

cool, i geuss ill add it to the long list of things to do


this gauge if/when i install i would like to hook up to my EFI
anyone done this yet and/or the EGT wire?

 

[sweetdiesel]

where would be the best place to tap into? front / middle / back

couldnt you see like as high as 300 psi with big boost ?is there a ball park formula?

 

[turbo-max]

from what i recall, 1 1/2 to 2 times the boost pressure is ideal drive pressure, but most turbo applications are not that efficient and see 2~5 x's in the d/p

 

[The Neens]

where would be the best place to tap into? front / middle / back

I'd like to know as well...I'm gettin' interested in doing this...

 

[McRat]

I've never logged drive pressure yet. Something I've meant to do, but haven't.

You could also figure out drive pressure with 2 EGT probes. One pre turbo, one post turbo. You would assume pressure would be close to atmospheric at the post turbo and do the math.

The closer to the same temp, the lower the drive pressure.

 

[sweetdiesel]

http://www.autometer.com/cat_accessoriesdetail.aspx?vid=27


i was thinking about using this and tie into EFI with it so i could log the pressure

 

[Lennart]

Simon,

once you upgrade your turbo and have the vane position sensor unused you could hook it up there and just log that PID! No need to run wires inside the cab.
You could also do the same thing with the EGR feedback!
some of the gasser guys do this to log fuel pressure and I figured that we should be able to do the same. All you need is to locate some 0-5V pressure sensors...calibrate them and create a custom PID.
...but I see you already know as I was going to post a link to the thread over at the EFILive forum.

 

[sweetdiesel]

Lennart
THATS COOL!!! i just read some of that post on EFI forum

so i just use the AutoMeter sesnsor and use the calibrations in the vane position table? or how do i set the varibles?

 

[sweetdiesel]

Simon,

once you upgrade your turbo and have the vane position sensor unused .

that's a good enough reason to upgrade for me!

 

[JOHNBOY]

Simon,

once you upgrade your turbo and have the vane position sensor unused you could hook it up there and just log that PID! No need to run wires inside the cab.
You could also do the same thing with the EGR feedback!
some of the gasser guys do this to log fuel pressure and I figured that we should be able to do the same. All you need is to locate some 0-5V pressure sensors...calibrate them and create a custom PID.
...but I see you already know as I was going to post a link to the thread over at the EFILive forum.

Dooh!

One time it is bad to have a no emissions old school dumb turbo truck. I could change to a emission operating system but I would need to change the whole harness to?

I have been looking at a stand alone loggers like the ones from Corsa and RPM Performance. Any body know of any others?

 

[sweetdiesel]

Dooh!

One time it is bad to have a no emissions old school dumb turbo truck. I could change to a emission operating system but I would need to change the whole harness to?

I have been looking at a stand alone loggers like the ones from Corsa and RPM Performance. Any body know of any others?

you should still be able to ues EFI just need 5v of power to supply it
im going to investigate this more tommorow and let you know john

also im going to tap into the middle of the manifold

 

[Lennart]

The 5V reference voltage is already in the EGR and vane position connectors...

 

[sweetdiesel]

FYI here is another option for us:
http://www.dieselplace.com/forum/showthread.php?t=84698
but im going to try and build my own, im just waiting for a call back on some parts, ive also located a temp sensor that should have no issuse with hooking into EFI....cost not sure yet

 

[JOHNBOY]

Simon
Am I reading that thread correctly? You need V2 to use it?
Ugh! more money to throw at it.

 

[sweetdiesel]

John

i believe you can still use it with v1, but its a little different setup

 

[c_murray7313]

drive pressure gauge install

OK folks,

i have ane more spot in my truck to install a gauge, i already have boost 0-60psi, fuel pressure 0-100psi, pyro 0-1600, and a trans temp gauge. ive been thinking of installing a drive pressure gauge but am having a couple issues with this.

1)where am i supposed to tap into the exhaust.
2)what type of gauge am i supposed to use, boost gauge, electric pressure gauge?


any and all help is greatly appreciated. thanks in advance.


chris

 

[sweetdiesel]

OK folks,

i have ane more spot in my truck to install a gauge, i already have boost 0-60psi, fuel pressure 0-100psi, pyro 0-1600, and a trans temp gauge. ive been thinking of installing a drive pressure gauge but am having a couple issues with this.

1)where am i supposed to tap into the exhaust.
2)what type of gauge am i supposed to use, boost gauge, electric pressure gauge?


any and all help is greatly appreciated. thanks in advance.


chris

i use a 0-100 psi electric fuel pressure gauge

tap into the manifold on the opposite side of the pyro
BD manifold works great for this

its a good idea to use some tubing to come off the manifold so you dont wreck the sensor

ill post some pics of what i used tommorow

 

[sweetdiesel]

chris
here is a idea, get a extra 0-100psi sensor from autometer and rig it in so you can switch between you DP and FP
cheap mod that way or else use the 100psi for the DP and get a 0-30psi for the fuel press