timk

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.

Savington

iTrader: (31)

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

soviet

iTrader: (10)

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

timk

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

That $25 sensor looks interesting too!

Savington

iTrader: (31)

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

wildo

iTrader: (1)

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.

soviet

iTrader: (10)

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

timk

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

soviet

iTrader: (10)

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.

timk

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

soviet

iTrader: (10)

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

muoto

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% I need bigger injectors. I need these: Injector Dynamics - ID1300

Savington

iTrader: (31)

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.

soviet

iTrader: (10)

ID1300 will be $195 per injector

Savington

iTrader: (31)

Gotta pay to play.

JasonC SBB

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

timk

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

Savington

iTrader: (31)

0.5v=0psi
4.5v=~120psi

Linear between the two.

phocup

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 ?

afm

iTrader: (3)

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.