Who logs fuel pressure?
 

Seems like it is a good thing to monitor to warn if it is out of range.

If you do this already, what sender are you using and where is it mounted?

Just collecting ideas, it's not something I'd want to go wrong!

I'm thinking along the lines of a 0-150psi Honeywell sender mounted to the body with a rubber isolator, rather than the engine.

GM sensor mounted to the chassis and wired to any 0-5v input.

I want to log fuel pressure but didn't get around it it YET

$25 sensor, looks identical to AEM
Pressure Transducer or Sender 100 PSI for Oil Fuel Air | eBay

Andrew when you say GM do you mean the ACDelco D1846A?

That $25 sensor looks interesting too!

I use Wells PS421, which is a 1/4" NPT thread. Easier to find adapters for than the M14 stuff. 0-128psi range.

I use an AEM sensor, which uses the standard metri-pak 150 3-pin connector. Easy to work with. Mounted directly to the aluminum fuel rail.

GM's look like an interesting option, and sure are a lot cheaper.

I ended up buying this pressure sender and it works great. Mounted directly onto the FPR where the gauge used to be. Hooked up to a spare ADC input in MS3. Steady 60psi base becomes 75psi pressure @ 16psi :)

Nice!

It's funny you are running 4 bar base pressure, I was just asking about this in another thread.

How do you find the difference?

Cheers

I raised base pressure from 3 bar (45psi) to 4 bar (60psi) and at idle, the engine pulls more vacuum than ever. It's definitely noticeable and I attribute it to better atomization and more complete burn.

It really is a question of what injectors you have. I have ID1000 and they love high pressure.

I have their 715 (ID725), I would assume they are similar...

yeah then you basically want to run the highest base fuel pressure that your pump can support @ your WHP goals.
I'd run 70psi but then at 25psi boost I would be at 95psi fuel pressure - my pump (DW300) maxes out at 100psi and doesn't flow enough at that pressure to support 400+ whp on E85

I’m about to setup fuel pressure warning system for my Adaptronic. I already have an oil pressure warning with simple 0-5v pressure sensor connected to EGT input (only free 5v input)

I have DW300 feeding 800cc injectors at 85psi pressure. Injector DC is around 90-95% :hsugh: I need bigger injectors. I need these: Injector Dynamics - ID1300

The new ID1300s are pretty much the ideal injector for 450+whp on E85. That much power on ID1000s required so much base pressure that a single DW300 couldn't keep up, which meant you needed a Bosch 044 to push the pressure up under boost. The 1300s let you run a more normal 60-70psi of base pressure and a single DW300 without hassling with twin pumps.

The fact that they're mfg'd specifically for ID by Bosch Motorsports is just the icing on the cake. All-stainless internals, designed specifically for alternate fuels. Very cool.

ID1300 will be $195 per injector :cry:

Gotta pay to play.

Description is "oil pressure switch", not sensor. Sure it's a pressure transducer?

I see the LS1 sender being referred to as an oil pressure switch too even though it is definitely a linear 0-5v output.

0.5v=0psi
4.5v=~120psi

Linear between the two.

If I currently have a fuel pressure gauge, and want to log FP in MS, can I just tee the 5v line from the gauge or would that mess with the voltage somehow and I should get a separate pressure sensor for MS ?

That will work if it is in fact a 0-5V ratiometric sensor that the gauge uses -- some use resistive sensors, potentially over a larger voltage range in the pullup configuration provided by the gauge.

There will be a slight loss of accuracy if there are ground / 5VRef offsets between the MS3 and the gauge, so have the device for which you care more about accuracy supply the ground / 5VRef signals. You could in theory join the sensor return signals of the gauge and the MS3, but that could turn a minor ground offset issue into some nonzero current flow, so I would personally avoid that.

In practice, people have ground offset issues with WBO2 sensors since some of them flow large heater current through the same ground conductor that is used to reference the analog output. An oil pressure gauge doesn't use anywhere remotely near that much power, so the potential for ground offset issues is radically reduced. Sharing 0-5V ratiometric pressure sensor outputs is pretty common and generally not a problem.

Wow. Thanks for the detailed response! The gauge I have is a so it doesn't specify what type of sensor it uses. I'll need to dig a big deeper.

Given that it has the same form factor and connector as all the myriad GM/Honeywell/etc automotive pressure sensors (a small sensor with a round 3-pin Metri Pack 150 connector), it's almost certainly 0-5V ratiometric.

I've run this because I like to live dangerously:

https://www.ebay.com/itm/Pressure-Tr...frcectupt=true

I learned that a walbro 255 was too much for the stock NB FPR and would rock up to 75 psi at idle and drop as PW increased. Walbro 190 didn't have this bad habit, and supported 650cc injectors just fine to 80% duty cycle.

Walbro 190 will support four 650cc injectors at ~100%DC even at 65psi of rail pressure. I'm pretty sure Rover still has one, left over from when the car was first built in 2010.

Sorry, didn't mean that was the limit of the pump, just that I can verify that it supports my fueling needs which is 650's @ 80%.

im logging fuel and oil pressure using cheap ebay 150psi sensors, works really well.

Hf-mx5t , do you happen to know the voltage on your gauges .5-4.5vdc?

Yeah. thats correct. standard Ebay cheapo sensors, but they work fine, ive also added a failsafe in the ECU to check if fuel pressure follows boostpressure

Did the sender come with a plug and pins? I just checked the ebay listing and looks like sensor only.

The ebay transducers come with pigtails, but I have found them to be unsuitable for automotive use. I have logging for many different pressures on my car, almost every one of the pigtails that came with the transducers has failed.

There are decent options available, search for 904-222, get a pigtail with at least 20AWG wire.

https://express.google.com/u/0/produ...BoCkFEQAvD_BwE

this should work for fuel also. Do you have ability for logging oil pressure ?

I log everything. I log oil pressure in 3 locations. Fuel pressure in 2. I log air pressure in 7 locations and EGP. The AEM sensors are nice, but I have had 2 of them fail on me over the years.

what's the setup in Ms3 for logging the oil and fuel ? I just got my MS3 PNP Pro for a 97. If you don't mind sharing that would be great.

I have 27 ADC channels via 3 tinyIOx modules connected to the CANBUS. MS3 has very few spare analog channels.

(I'm gonna loan this thread)

Can anyone help me? I'm having strange fuel pressure drops at track but only after 10min of hard driving. If I do one cooldown lap, pressure is back to normal.
Things I tested so far:
-New AN6 teflon fuel lines
-three (3) different fuel pumps (currently using AEM 400lph)
-three different fuel pump "intake filter socks" (currently using awesome Holley Hydramat)
-two different engines+turbos. No difference If I have 400whp or 500whp setup
-Temps looks ok. (fuel temp, coolant temp and oil temp)
-didn't find any leaks in FPR vacuum hoses

Only parts left that I haven't change is OEM fuel filter(its new) and oldschool Begi Fuel pressure reg. (UFO looking big thing). With 26psi boost pressure that I run, my fuel pressure stays around 600kpa (87psi) at the begin and after 10min in track I lost half of that pressure.....And nothing in temps change that much....

Why are you using sky high fuel pressures? Set base pressure to 43.5 psi and use properly sized injectors. With 26 pounds of boost you should see about 69.5 psi at the rail at full boost with a proper rising rate FPR. If you've already done everything else and your fuel temp is not getting out of control then replace the FPR and see what happens.

I forgot to mention that. I run E85 and my injectors are EV14 1300cc. I need that high pressure to maintain inj. duty cycles in ok levels (75%). Base pressure is 43psi

I would look into a new FPR. Is the current not a 1:1?

I think that is the right way. That old Begi FPR unit is ~15 years old now (you can change the ratio with it).
I have new Fuelab FPR already waiting for last AN fittings, I'm sure that will work better...

You didn't mention anything about wiring. Don't tell me you're running the stock fuel pump wiring and the stock fuel pump relay.

I'we buld dozens of 500bhp BP setups over 15 years. Why would I do that?

If you are running e85 and high base fuel pressure and a 1:1 FPR, plus a lot of boost puts your pump output up into crazy amps territory. Probably ~15A or more. I've never measured, but I bet a stock pump tops out at 10A.

Kinda silly to install a huge pump on stock wiring, not too hard to add a relay with the battery being where it is.

I don't think bigger (16A) pumps even work at all with stock wiring...why would you think someone being so stupid to run massive pump with stock wiring?
Much more common problem is fuel pump filter sock collapsing

I don't pick up on sarcasm well, my bad...

I think solved my problem. Fuel pressure sensor had a worn connector. They are right behind the radiator and somehow hot air make that broken connector to read lean....

I measure fuel pressure. My dead times for the injectors (FF640s) are scaled by fuel pressure differential, which is calculated field in my Elite 1500. I monitor/log both fuel pressure and FPD via CANBUS output. I also have some engine protection setup for fuel pressure.

Need help where to wire the 100psi sensor into MS3 - I have an options rear connector that has 2 analog channels MAF for default Analog 1 or Analog 2 seems also open. Does this channel receive the signal Pin C and 5V from H and Sensor ground pin A? Once wired is the next step tuner studio custom ADC? Any tutorial on ratiometric .5-4.5 settings and calibration ?

Attachment 225665

Use generic sensors and the linear scaling in that feature.

wiring the sensor
 

Is shielded wire needed for fuel pressure sender ? Did not think it’s sensitive enough but thought of checking for good measure. Thanks

No