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niterydr
09-14-2011, 11:19 PM
Seems the DW aren't really outflowing the walbro 255's. Boost up that pumps voltage and report back results. Do you have an adjustable fuel pressure regulator? I thought one of the advantages of the DW is the continued flow at higher psi?

Halon
09-14-2011, 11:21 PM
Lol, I didn't know this was your name on here. That's funny :D


I shoulda ran you in the bean, but there were too many wierd noises, plus we noticed the oil was low, just wasn't feeling like it was a good night to push it.

blackawdtsi
09-14-2011, 11:52 PM
Haha, Brad. Maybe let me try it out to see how much more I get out of the pump? I really don't have any experience with them and they do cost quite a bit more than just one more pump.

Swanny, yeah I do have an AFPR. I haven't read much about the pump, but I have seen the flow sheet. It's a good idea, but I'm not sure at what point the flow would die at. Maybe I'll test that out tomorrow.

Brandon, you should have run me. Especially prior to tuning, I was only on 19psi. Although I've already had one car throw a rod through the block next to me. One time a season is enough. :)

niterydr
09-15-2011, 12:25 AM
http://www.turbobuick.com/forums/attachments/general-turbo-buick-tech/135059d1311802300-fuel-pump-flow-test-aeromotive-340-vs-dw300-vs-044-vs-walbro-ams-fuelpumpflowchart1.jpg

AMS did this test, assuming 13.5 volts. Seems to match what you are finding. What size injectors again and what airflow numbers? Fuel type?

blackawdtsi
09-15-2011, 12:36 AM
1680cc high impedance Boschs, on E85.

I'm not sure on airflow to tell you the truth. Link says 75.3 lbs/min at the highest point, but my AFRest is 5% richer than actual AFR. With 5% taken off the airflow, it's still 71ish lbs/min. So I think it's inflated somehow but not sure now.

niterydr
09-15-2011, 02:24 AM
You live in Savage? Where at? I haven't seen this car around yet. Also you called me Swanny...what is your name? Odds are I know/recognize you but not the SN.

1680's should not be tapped out, plus I doubt that DW300 can support 1680's @ that boost pressure, you may be out of pump. To gain flow, you will have to scale back the baseline fuel pressure AND supply more voltage to the pump, hopefully the FPR can keep up. I am assuming your baseline is 43psi +30psi = 73psi gauge. If I had to venture to guess that would be around 225LPH. What is interesting, is per the above chart, you were only flowing maybe 200lph previously.

I would suggest to pull the baseline back to 30-35psi gauge. That will put you around the same flow now (little higher technically, maybe 20 more lph) at up to 35psi. Gives you some headroom.

Of course you are shrinking the injectors roughly 16.8%, making them 1397cc @ 30psi baseline fuel pressure.

blackrosenova400
09-15-2011, 02:51 AM
I work in Savage and Id love to see this car roll by my work on corner of 13 and 101!

C3L1CA
09-15-2011, 07:53 AM
I'd let you try it if you install it and un-install it if you don't like it, ohhhh and I get a ride in it :D

The boost a pump and a single walbro was enough to make the 520 at db on boost and 597 on nitrous. It'd be interesting to see if it would give enough juice for your setup.

scheides
09-15-2011, 02:44 PM
BAP is the way to go; your fuel system (and its limitations) are nearly identical to mine:
DW300
FIC1680's

Ran out of fuel probably around 420-435whp at DB. Installed BAP and I can run a LOT more boost now!

http://scheides.com/misc/pics/evox/evox-bap-test2.jpg

albeit the X tends to run out of fuel a little sooner than DSM's/CT9A evos.

niterydr
09-15-2011, 02:51 PM
Sounds like everyone is screaming BAP.