How to scale the HPFP pressure sensor

[djuosnteisn]

Well looks like the stock orifice is roughly 3/16" (0.1875") from this pic and ignoring parallax and lens distortion lol:




If i used a 1/8" (0.125) hole, it would reduce the area by just over half. I guess i'll try that first.

[Realgib3]

Originally Posted by djuosnteisn Well looks like the stock orifice is roughly 3/16" (0.1875") from this pic and ignoring parallax and lens distortion lol: If i used a 1/8" (0.125) hole, it would reduce the area by just over half. I guess i'll try that first.

Good work as always! How ironic that we were just talking about the intake mani and uneven flow yesterday...

[socks]

Originally Posted by djuosnteisn Well looks like the stock orifice is roughly 3/16" (0.1875") from this pic and ignoring parallax and lens distortion lol: If i used a 1/8" (0.125) hole, it would reduce the area by just over half. I guess i'll try that first.

3/32" or 3/16"?

Originally Posted by socks 3/32" or 3/16"?

I'd go for 1/16th, thats the smallest bit i have in my set.

[Deadman]

i think the pic is deceiving... dustin did you measure the orifice with calipers by any chance? Or just guessing off the tape? If you have a set of calipers they may reach in there (from the reverse side) and give you exact measurement

[djuosnteisn]

LOL, i can't even count tick marks on a measuring tape, much less use calipers, haha.


definitely 3/32, and yeah, 1/16" would probably work fine, lol.

Oh and 1/16" is down to 62 thousandths, so were approaching the 50 thou mark i originally mentioned, which hopefully isn't too small to function.

3/32 to 1/16 results in an area reduction of .006903 to .00306, or again, just over half.

[dan7225]

looks like 3/8" to me.

oops, you were talking about the hole inside the hole!

[socks]

dustin, did you see any markings on that valve?

I'm really hoping as a permanent solution we can find a suitable replacement. I dont like ghetto as far as permanent goes.

[djuosnteisn]

I'll check when i get home.

[Deadman]

Relief Valves, Thermal Relief Valves, Safety Relief Valves, Cryogenic Relief Valves, Pressure Relief Valves, Needle Valves, Control Valves, Cryogenic Relief Valves, Check Valves, Releif Valves, Bi-Lok Tube Fittings, Needle Valves, Thermal Relief Valv

Im sure dustin can find a number on it somewhere...



"UPDATE (11/10/09) Even MORE LNF Goodies

Another Trifecta first, last week we unlocked the fuel rail pressure tables in the LNF ECM so customers requiring raised fuel rail pressure for upgraded turbos can get all the fuel they need! "

Unlocked By djuosnteisn kthx

http://www.carsponsors.com/420576

^another direct injection car (GT35r) stuck @ 400whp... hrmm i see a trend here lol. trifecta is working with the sky to unlock fuel tables and rail pressures etc i do believe

[djuosnteisn]

That inline one looks awesome, but our relief valve isn't NPT. Doesn't mean we can't use adapters tho.

[Deadman]

dustin does the valve come off the line or is it 1 piece with the line itself? It looks as if the inline valve could possibly work.. That is if you cant find a part number on the oem.

[djuosnteisn]

It's not attached to the line. I posted some pics of it a few pages back. It threads into the fuel rail with like a 10mm x 1mm pitch (or 1.25mm), and has a line that connects to it similar to the connections on the hpfp low pressure side.

Here's the only writing on the valve:
7.G9.

[Deadman]

need to check mcmastercarr or someone i suppose... im sure this valve is out there somewhere

[djuosnteisn]

We have a McMaster carr at work, i can check tomorrow i guess. That book is huge though... might take a few years.


I'm gonna play with disks tonight maybe.

[Deadman]

ya... i mean i wish i had the piece in hand, i think modifying it is gonna be the easiest thing to do at this time.

I checked mcmasters website and did not see anything, and yea i have the book @ work and its huge haha

[superskaterxes]

why cant we just machine something that threads into the rail (male end), with a 50thou hole in it and then the female end threads into the stock spill valve. kinda like a spark plug non fouler but with a tiny tiney(sp?) hole in it.

[Lex]

You don't want it to bleed pressure all the time.

[superskaterxes]

well this wouldent bleed pressure all the time it would only slow down how fast the spill valve saw the actual pressure right?

[phantom3]

The angles on the fitting look like the custom threads I used to cut on oil field tools. The threads we cut were on more of an angle through.
We used the angles as sealing surfaces.

Ive been looking at the profiles of various fittings, but I can find one that matches this.

[djuosnteisn]

Originally Posted by superskaterxes why cant we just machine something that threads into the rail (male end), with a 50thou hole in it and then the female end threads into the stock spill valve. kinda like a spark plug non fouler but with a tiny tiney(sp?) hole in it.

I don't think this valve is the "spill valve". It's a pressure over load relief valve, most likely used for safety, not proper functionality.

I think an adapter like this would be okay, right lex? No different that me shoving a custom restrictor in the hole?

Or do you have a change of heart about this approach.

Still though, i'm with sockerdoodles, best options is a complete replacement with a valve that opens at higher pressure, like 2300 or 2500 psi.

[06Speed6]

It might be easier to drill out the valve and thread the rubber hose end for metal tubing and then find an inline valve.

[superskaterxes]

Originally Posted by djuosnteisn I don't think this valve is the "spill valve". It's a pressure over load relief valve, most likely used for safety, not proper functionality. I think an adapter like this would be okay, right lex? No different that me shoving a custom restrictor in the hole? Or do you have a change of heart about this approach. Still though, i'm with sockerdoodles, best options is a complete replacement with a valve that opens at higher pressure, like 2300 or 2500 psi.

yah my idea was pretty much the same concept as the restrictor thingie but instead you thread it on both sides and you never have to worry about it moving around in there at 2200psi.

but +1 if we can find a replacement

[socks]

Originally Posted by 06Speed6 It might be easier to drill out the valve and thread the rubber hose end for metal tubing and then find an inline valve.

the probelm when you do that is your then going to have to deal with rail pressure in a rubber line.

Its fine when you have the relief valve there, because it doesnt pass rail pressure on. Thus it can pass into a rubber line (such as the stock one).

If you drill that valve out, your gonna have to make whatever you put past that capable of dealing with 2000psi of fuel.

[Lex]

An adapter with a hole drilled out will work - obviously you'd have to have the threads machined properly. If those are not sealing threads (NPT or similar) you will need whatever is sealing that valve on the rail duplicated.

Drilling out the valve is not the best idea as socks mentioned IMO.

I was thinking the disc with a hole against the flat end of the valve might be cheap/easy way to do it.

[djuosnteisn]

This valve seems to seal on the surface, not on the threads. It's straight threaded.

I'll make a disc soon, and see if it fits in there, but if it's too thick the sealing surface may not touch. We'll see soon.


I feel sick as shit today tho. Swine flu. I'm fucked.

[Lex]

Get better man, the Mazda can wait.

[masskaos]

i think i might have found something that could work with an adapter fitting. the good thing about this is that it's adjustable.

relief valves - direct operated
part number 62299169 or 62299144

[shook02]

Originally Posted by djuosnteisn This valve seems to seal on the surface, not on the threads. It's straight threaded. I'll make a disc soon, and see if it fits in there, but if it's too thick the sealing surface may not touch. We'll see soon. I feel sick as shit today tho. Swine flu. I'm fucked.

oh man swine flu.... well it was fun while it lasted!

[SpeedSixxx]

Originally Posted by socks the probelm when you do that is your then going to have to deal with rail pressure in a rubber line. Its fine when you have the relief valve there, because it doesnt pass rail pressure on. Thus it can pass into a rubber line (such as the stock one). If you drill that valve out, your gonna have to make whatever you put past that capable of dealing with 2000psi of fuel.

3000psi

[KoukiS14]

Originally Posted by masskaos i think i might have found something that could work with an adapter fitting. the good thing about this is that it's adjustable. relief valves - direct operated part number 62299169 or 62299144

Sure, that might work, but, umm, did you see the price? Fuck that!

[socks]

thats a drop in the bucket bro, especially if it will open up the potential as much as we think it might.

[SSinstaller]

Originally Posted by socks thats a drop in the bucket bro, especially if it will open up the potential as much as we think it might.

$350 to get the extra 100~300 hp some of these turbo's and built motors have left in them, that's a bargan..

[superskaterxes]

yah but that 350 dollar valve isent gona change shit if you cant scale the sensor more.

Originally Posted by djuosnteisn I feel sick as shit today tho. Swine flu. I'm fucked.

my dads brother died from swine flue on Saturday. he was 46 and in perfect health prior to getting sick. You should get checked out.

[djuosnteisn]

Originally Posted by 18psiWhiteMS3 my dads brother died from swine flue on Saturday. he was 46 and in perfect health prior to getting sick. You should get checked out.

I really have no clue wtf i have. All the sudden this morning i just felt like i was 90 years old. Body so fucking achy, like sharp aches and dull pains and brain never really turned on.

I'm just gonna keep up on liquids and ride it out. I think i'll be fine, but yeah, if it gets worse i'll def get checked out.



As far as the valve goes, yeah, if we planned on running higher and higher pressures, eventually we'd have to upgrade to a higher pressure sensor, cause the stock is only good for 400~500 more psi. And honestly beyond that, i think the injector operation might become a lil iffy.

Personally i don't want to spend 350 on a new valve, i'll probably try the disk first. Still tho, great find Mass!

[06Speed6]

Ide buy that valve, that isnt a bad price for a valve if it is high enough quality to hold a consistent pressure for a few years etc, it would suck if it lost or gained pressure.

[Lex]

In the end we might not need a valve at all. This is why starting with a cheap disk to test is best. You can also put a restrictor pill in the hose that is low pressure downstream of the valve. As long as you don't make the pill very small, it should restrict enough flow.

[masskaos]

i would not recommend putting in a restrictor pill downstream. that will increase pressure in the low pressure line and could make it burst.

[Deadman]

somewhere someone has to make this exact piece... hrmmm

[Lex]

Originally Posted by masskaos i would not recommend putting in a restrictor pill downstream. that will increase pressure in the low pressure line and could make it burst.

It's a matter of how large of a restrictor Ideally however it should be on the high pressure side, I agree. I don't think it would take much of a restriction to bump the rail pressure up.