drive pressure

[LarryJewell]

This would make a good DYI writeup Simon

 

[Killerbee]

Larry, you should be able to do this with the scan gauge. You would need a 5V sensor that will stand up to the abuse.

 

[c_murray7313]

thanks guys, im prolly gonna do like simon said and get a 30psi fuel pressure gauge and use it for the fuel pressure and take the 100psi aguge and use it for drive pressure. id do the switch thing but i need to fill another gauge spot anyway. thanks guys.

 

[sweetdiesel]

Larry, you should be able to do this with the scan gauge. You would need a 5V sensor that will stand up to the abuse.

there is actually a couple ways we could do this,I would love to set it up though my EGR valve and monitor it that way with EFI or you could simply run it directly to the V2


http://www.forum.efilive.com/showthread.php?t=2964

 

[MAXLLY]

Exposing ignorance again... I 'm not a turbo diesel guy, yet.

What is drive pressure and why monitor it? What will it tell you is happening?

Thanks.

 

[sweetdiesel]

well its basically the back pressure of the exhaust, and on the VVT its a key component to running a good tune IMO, also with larger turbos and twin set ups

ideal would be a 1 to 1 ratio( depending on turbo) or some where around there and vane posistion for us stockers plays a huge role, aftermarket turbos need timing and fuel adjustments to alter there drive pressure

when i installed the HTT mine would follow boost, when i had the stock on it would be double the boost and sometimes tripple Vane altering would make dramatic changes to this

 

[sweetdiesel]

ok, this is what I used

20" SS tubing
4'- 1/4" in hose something that can stand some heat atleast a couple hundred F
a connection to hook from the Exhaust manifold to the tubing
a connection to hook the hose to the tubing
a connection to hook the hose to the autometer sensor
a 0-100 psi electric boost or fuel press gauge
and ofcouse whatever you need to install a gauge ( wire, fuse )
hope this helps!

Thanks to Dale and his amazing picture taking.

 

[sweetdiesel]

ok, this is what I used

20" SS tubing
4'- 1/4" in hose something that can stand some heat atleast a couple hundred F
a connection to hook from the Exhaust manifold to the tubing
a connection to hook the hose to the tubing
a connection to hook the hose to the autometer sensor
a 0-100 psi electric boost or fuel press gauge
and ofcouse whatever you need to install a gauge ( wire, fuse )
hope this helps!

Thanks to Dale and his amazing picture taking.

 

[LarryJewell]

Thanks Simon

 

[MAXLLY]

sweet, thanks guys!

 

[sweetdiesel]

probably the best thing you guys could use is a hydraulic hose from John Deer
or even better a steam hose
i used the braided simply because ....it's so readilly availible for me
just basically find something good for heat and 100psi-200psi

home depeot may have some copper tubing for hot water tanks and plumbing
might be a good place to get the tubing


FWIW the lenght that i used it not carved in stone you could use longer or shorter,
The line wont get that hot as your EGTS, unless it is actually flowing through the line
but i would try to keep the tubing to atleast a foot or more.

here is a link to autometer gauges any of the 0-100psi fuel will work
http://www.autometer.com/cat_gaugesearch.aspx

 

[LarryJewell]

Bringing this back for more discussion

Simon, my new gauge should be in in a few days, you ready to make the tutorial

 

[LBZ]

We need a "How to log drive pressure with EFI" tutorial too!!

 

[LarryJewell]

Maybe if everybody would PM Simon, he just might do it

 

[sweetdiesel]

Maybe if everybody would PM Simon, he just might do it

i would love to tie into the EGR 0-5volt


also,something i didnt realize is with the cold weather my SS tubing is freezing im geussing a little condesation and it sits in a low spot then overnight it freezes......who would of thought?


you got all the pieces you will need yet larry?

 

[LarryJewell]

you got all the pieces you will need yet larry?

actually I cleaned out my pm box and lost the list, would you mind re-sending when you get time :baby:

 

[sweetdiesel]

hose

tubing

electric gauge

basically once you find some tubing to use, find out what connection it is? is it NPT fitting or what? then you need to install this into the manifold and that will be a 1/8" npt so make sure you can install the tubing onto the 1/8" npt fitting coming out of the manifold

then on the other end of the tubing you will attach your hose, Again you will need to adapt to the hose from the tubing

then you will need to adapt to the hose to the sensor that will come with your gauge ( probably 1/8"npt or 1/4")


as for the hose try and find some good higher heat hose atleast good for 100f
i can grab a hold of my hose after the truck has been running and it dont burn me so it doesnt have to be that high of temp

but if you can, find a hose that is crimped fittings not hose clamped together.....if you can?

install the gauge and run the wires and sensor through the firewall and connect it to the hose

 

[LarryJewell]

hose

tubing

electric gauge

basically once you find some tubing to use, find out what connection it is? is it NPT fitting or what? then you need to install this into the manifold and that will be a 1/8" npt so make sure you can install the tubing onto the 1/8" npt fitting coming out of the manifold

then on the other end of the tubing you will attach your hose, Again you will need to adapt to the hose from the tubing

then you will need to adapt to the hose to the sensor that will come with your gauge ( probably 1/8"npt or 1/4")


as for the hose try and find some good higher heat hose atleast good for 100f
i can grab a hold of my hose after the truck has been running and it dont burn me so it doesnt have to be that high of temp

but if you can, find a hose that is crimped fittings not hose clamped together.....if you can?

install the gauge and run the wires and sensor through the firewall and connect it to the hose

OK, I printed the pics from post # 18, i'll carry those to the parts store

 

[LarryJewell]

probably the best thing you guys could use is a hydraulic hose from John Deer
or even better a steam hose
i used the braided simply because ....it's so readilly availible for me
just basically find something good for heat and 100psi-200psi

home depeot may have some copper tubing for hot water tanks and plumbing
might be a good place to get the tubing


FWIW the lenght that i used it not carved in stone you could use longer or shorter,
The line wont get that hot as your EGTS, unless it is actually flowing through the line
but i would try to keep the tubing to atleast a foot or more.

here is a link to autometer gauges any of the 0-100psi fuel will work
http://www.autometer.com/cat_gaugesearch.aspx

I thought in a different post you said not to use copper tubing , so is copper tubing ok instead of stainless "I'm assuming that is what you were refering to when saying SS"

Using copper tubing might make this a one stop shopping trip

Where did you get the braided hose from?

 

[LarryJewell]

Larry, you should be able to do this with the scan gauge. You would need a 5V sensor that will stand up to the abuse.

Curious, how would this actually hook-up to the scan gauge and how would I program the gauge to read the pressure?