sucess with inline pumps?
Dec 8, 2009, 10:22 AM
#31
I know of another setup in town that has his rigged the same way as me and he has been going for over a year now so far. I guess I will be the next test subject.
Last edited by fre; Dec 8, 2009 at 10:28 AM.
Dec 8, 2009, 11:18 AM
#34
There's no benefit to having a fuel system below 5 PSI that is choked up by a non-running pump in the feed line. There is a substantial con to that idea, because you are forcing the in-tank Walbro to work much harder to push fuel past the non-working second pump. Lots of people have killed in-tank pumps in this situation when the in-line accidently failed. You're doing the same thing, but on purpose...
Last edited by fre; Dec 8, 2009 at 11:37 AM.
Dec 8, 2009, 11:21 AM
#35
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my inline walbro is in the engine bay , connected directly to the fuel rail. give dan a call at batlground.com, he can tell u more about it. Works real good, no noise at all. He said i can up the boost to 35psi or 500hp without a problems with this setup. And iam still on stock rail and fuel pressure regulator.
Dec 8, 2009, 11:24 AM
#36
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iam also on stock fuel lines. My afr are right around 12.0 at redline,which is pretty good tune. We also advance the timing around 18 degree for e85. which is pretty high .
Dec 8, 2009, 11:32 AM
#37
How is your pump wired? I have mine directly to the battery, so it probably sees around 14v and has no relay for speed control (resistor to drop voltage), which would also solve my problem. Your tune sounds about right on e85. I have gotten upwards of 550whp out of this fuel system before it sends my injectors static.
Dec 8, 2009, 11:43 AM
#38
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my inline wired directly to the battery with a fuse and relay. Then the pump also had connect with a hobbs switch , with a vacuum line t the the intake manifold. He recommended the hobbs switch connected so the pump only kick on when it's 4psi boost and up. He doesnt want to run it all the time. I have no ideas
. Maybe it's too much fuel for idling.
. Maybe it's too much fuel for idling.
Dec 8, 2009, 11:47 AM
#39
That shouldn't be a problem with series pumps. There are plenty of OEM cars out there with twin pumps running in series, full time. I know, I own two different ones.
Last edited by Ted B; Dec 8, 2009 at 11:53 AM.
Dec 8, 2009, 11:58 AM
#41
my inline wired directly to the battery with a fuse and relay. Then the pump also had connect with a hobbs switch , with a vacuum line t the the intake manifold. He recommended the hobbs switch connected so the pump only kick on when it's 4psi boost and up. He doesnt want to run it all the time. I have no ideas. Maybe it's too much fuel for idling.
. Maybe it's too much fuel for idling.
Dec 8, 2009, 12:10 PM
#42
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well fre, even when iam on boosted, i dont hear any pump noise at all. All i hear is the turbo whistling and the exhuast. I had this setup for about a month, who khow. You might have a bad pump.. My only problem now is the cold starting in the morning man. iam sure it is the e85 fuel . But if i mixed about 2 gallons of 87 pump gas, start pretty easy in the morning.
I had this setup for about a month, who khow. You might have a bad pump.. My only problem now is the cold starting in the morning man. iam sure it is the e85 fuel . But if i mixed about 2 gallons of 87 pump gas, start pretty easy in the morning.
Dec 8, 2009, 12:12 PM
#43
well fre, even when iam on boosted, i dont hear any pump noise at all. All i hear is the turbo whistling and the exhuast. I had this setup for about a month, who khow. You might have a bad pump.. My only problem now is the cold starting in the morning man. iam sure it is the e85 fuel . But if i mixed about 2 gallons of 87 pump gas, start pretty easy in the morning.
I had this setup for about a month, who khow. You might have a bad pump.. My only problem now is the cold starting in the morning man. iam sure it is the e85 fuel . But if i mixed about 2 gallons of 87 pump gas, start pretty easy in the morning.Just cruising on the freeway would be enough to quiet the pump down. It was only when I was idling at a light or under very light throttle, almost like there was backpressure causing the noise until enough of the fuel was being used to relieve it.
The reason you don't hear it is because you don't switch it on under those conditions, just like me now. That is why I only switch my pump on above 5psi, so I don't hear it when it would be noisey (vacuum).
Last edited by fre; Dec 8, 2009 at 12:17 PM.
Jan 14, 2010, 02:48 PM
#44
i didnt have the $ to fork out for a dual pump setup. not alot of people do in this day w/ this economy. like i said, aside from the addition of an external 255, the price to make a twins, cost me like $100. i made this twin pump setup a year ago. works PERFECT. no complaints. no issues w/ function, or drivability.
By "in series" you are talking about when one pump is activated by a certain PSI level, right? And by "in line" you are referring to having two pumps essentially running 100% of the time along the same path that operate as soon as you turn your car on, right?
I wonder where I'd be limited to power-wise on E85 with 1050cc injectors on the 73HTA Green. Any thoughts?
Jan 14, 2010, 03:11 PM
#45
Of course all these whp numbers are estimates since dynos and measuring methods vary by up to 15-20%. I guess a better way to put it is you should be able to get away with around 30psi on a 35r (not sure what the equivalant is on a green), assuming your head, block and intake manifold are stock and your running a decent amount of timing. Of course a green will flow less, so you will probably be able to max it out. If you run less timing, you will be able to run more boost and use the same amount of fuel.
Last edited by fre; Jan 14, 2010 at 03:21 PM.