Hulk

Not sure how it is hooked up. All I know is that I had to get a particular sensor installed. Apparently there are some other guys on the forum who are also reading fuel pressure off the DashDAQ. Perhaps one of them can chime in with the details[/QUOTE]

+1 for info on that

Gadget

OK, added the sensor and piped it into the DashHawk.

That makes sense.

Thanks!!

G

Hulk

If you add via the user input on the zt2 , what values do you give it in the dashdaq?

ajm55

I read FP via user input on the zt2. I don't know what values the installer designated but the calibration is out. So at idle and light cruising, the DashDAQ will read at around 6.2 whereas actual FP is closer to 5.2. On a WOT run the DashDAQ reading will drop to a low of around 5.3 on the OEM pumps. With the AEM pumps, I'd see a low of around 4.7. No doubt, Drew Technologies would be able to explain how to get the calibration right.

Sir-Boost-a-Lot

iTrader: (1)

Ajm- glad to hear you're finally getting a handle on things!

boostedfe3

I wonder if anyone else has these issues with aftermarket pumps? I am getting ready to install my aem 320lph pumps but if they cause an issue I will keep the stock ones and get rid of the factory fuel filter for an inline filter.

Hulk

I think someone tried an inline filter and it didn't work, something about losing pressure

boostedfe3

Makes me wonder if the filter they used was too small and actually restricting the flow. I purchased a fuel labs filter so maybe it will work, maybe not.

Hulk

Keep us posted

boostedfe3

Will do!

Sir-Boost-a-Lot

iTrader: (1)

I think it might be an issue of the internal return line being too small, and the pumps providing way more fuel than the engine needs. A new stock pump/filter assembly will put out all the fuel you'll need unless you're running E85 or running a big wet nitrous kit without a standalone fuel system for the nitrous.

boostedfe3

I believe you may be right. The only way to alleviate that issue would be to make the system a return style with a regulator in the engine bay. Here is a rundown of what my setup will be. Hopefully get started installing all these parts this weekend.

180 lower/84 upper pulley
Belt wrap kit
82mm Throttle body
Aem meth injection
Killer chiller
3 gallon trunk tank
Kleeman headers
looped rail w/1000cc injectors (NO E85)
One step colder plugs
I use BIP for ECU tunes
Nitrous maybe? at most a 50-75 shot.

Exotic-metal55

Anthony, Your heated fuel rails are a common problem from pumping to much fuel and most the fuel will be heated up and dumped back into the fuel tank via return line. You may need to add a progressive voltage controller or some way to manage the large amount of fuel you are pumping.

Also, are you using a fuel manifold set up in front of the pumps, so that your pumps have good supply under wot? Lot of times, big pumps can suck a fuel line dry at WOT and cavitate, if a fuel manifold is not present.

It is very hard for to compare your set up to others that may be near sea level , even if you have purchased the same bolts ons, as you are at 6000 ft above sea level. That is like being in outer space to us sea level guys

ajm55

Chris, this theory fits best with the symptoms I was experiencing on the AEM pumps. Your suspicion that clothing the fuel line with heat wrap would probably exacerbate the issue proved correct - that does seem to indicate that the fuel was heating up unduly in the tank itself. Anyway, I'll do some proper testing on the stock pumps over the weekend. Thanks for all your advice along the way.

Thanks Brooke. 5,500 feet above sea level is undesirable for so many reasons If I decide I need to go back to the AEM pumps, I'll explore both of your suggestions. I may be misunderstanding you but I do not have a return line from the fuel rails back to the tank. There is, however, a return line that feeds excess fuel from the left side of the tank to the right side (which houses the pumps). I'm wondering though whether Chris is not correct in his view that the stock pumps are adequate. If my fuel pressure and AFRs are constantly at a level that poses no danger, need I look at stronger pumps at all?

boostedfe3

I think Brooke is talking about a surge tank. A lot of road race, rally, and drift cars use them. It always has fuel in it to avoid starvation from lateral g's. I'm starting to wonder if there is a need for upgraded pumps if you stay around the 600 to 650whp range on gasoline. Of course with E85 you would need better pumps.

jcjmw

Ajm55, how are things going? Did you return back to OEM fuel pumps and are your problems resolved?

ajm55

All good so far on the stock fuel pumps, thanks. Not even the slightest hint of a problem. Did about 90 minutes of driving in 30 deg Celsius weather last weekend and fuel pressure held up just fine

jcjmw

Alright! Good to know and thanks for update!

ajm55

. I'm sure you'll enjoy the Weistec kit. Is your tune dialed-in? Are your cruising IATs under control?

EvaBraun&Vader

What kind of fuel pressure where you running and AFR’s?

EvaBraun&Vader

how much fuel pressure?