Vishnu N54 Fuel System Research Part 2

prelude2perfect · 04-12-2011, 02:25 PM

Quote:

Originally Posted by shiv@vishnu

In part 3, I'll show pics of all the various contraptions we fabricated

The closer we dug into it, the more work ended up being required. We tested several options.

What a tease

Rob@RBTurbo · 04-12-2011, 02:33 PM

Wait, what kind of numbers did you get from the EKP in terms of it's peak output capabilities to the LPFP? (ie. Was 11v the best you could get out of it?)

shockin330i · 04-12-2011, 02:33 PM

subscribed.

secretsquirrel · 04-12-2011, 02:43 PM

Subscribed. Setting my expectations on there being 4 parts so I wont be waiting for the climax to happen in part 3.

bimmertt · 04-12-2011, 02:44 PM

Is no one here concerned about the decrease in the LPFP performance after only a YEAR????

chingy24 · 04-12-2011, 02:47 PM

Great work Shiv!! Can't wait for part 3 and oh yeah that METH KIT!!! This money is burning a hole in my pocket.

jpsimon · 04-12-2011, 02:49 PM

Quote:

Originally Posted by bimmertt

Is no one here concerned about the decrease in the LPFP performance after only a YEAR????

well hopefully soon that won't be an issue!

Aridk · 04-12-2011, 02:50 PM

Quote:

Originally Posted by shiv@vishnu

I'd never put a walbro 255 (high pressure) in a car again. We used to sell them for our Subaru turbo kits back in the day. Out of 100 that would be delivered to me, at least 10 just wouldn't work. And out of the remaining 90, at least 20 would be returned/exchanged due to excessive whining.

Shiv

Great article, and I´m happy to see we´re (Vishnu-you are) finnaly geting somewhere with the fueling issues

But I would really hate if a whining fp would be the downside of this upgrade

Brey335i · 04-12-2011, 02:56 PM

I'm thinking 4 parts also. Part 3 will revolve around the various upgrades tested and the results. And then part 4 will be the conclusion that will most likely introduce a new Vishnu product

mithiral67 · 04-12-2011, 03:01 PM

Quote:

Originally Posted by bimmertt

Is no one here concerned about the decrease in the LPFP performance after only a YEAR????

This analysis does not prove that older pump performed worse due to age or that these pumps loss 11% productivity after one year. Only after a larger population test with control pumps confirmed to have similar productivity are allowed to have some sit for a year and some used day to day for a year and subsequent proof they vary would I place reliance on that conclusion.

vasillalov · 04-12-2011, 03:04 PM

I am most intrigued!

TurboSid · 04-12-2011, 03:16 PM

product and price better be in part 3... otherwise i'll just be sad

Joshboody · 04-12-2011, 03:20 PM

does the hpfp need the 72psi for its pickup, or is there some type of reservoir in the hpfp... ie larger volume that reduces pressure?

Brian135i · 04-12-2011, 03:20 PM

Quote:

Originally Posted by Brey335i

I'm thinking 4 parts also. Part 3 will revolve around the various upgrades tested and the results. And then part 4 will be the conclusion that will most likely introduce a new Vishnu product

I think your right. I can't wait, for more info and $$.

mrquick68 · 04-12-2011, 03:21 PM

Great read Shiv! I'm excited to see what you come up with.

As a side note, I don't hear my LPFP prime everytime i open the door. Only some times? I wonder if its "prime" function is based purely on pressure seen at the HPFP, and if it drops below a certian value (x), then it primes open seeing some defined activity with the vehicle?

ianthegreat · 04-12-2011, 03:37 PM

Quote:

Originally Posted by SennaZ

What's the best price for a lpfp? ...in case they turn out to be an expendable part running at higher voltages.

+1

shockin330i · 04-12-2011, 03:42 PM

Quote:

Originally Posted by mrquick68

Great read Shiv! I'm excited to see what you come up with.

As a side note, I don't hear my LPFP prime everytime i open the door. Only some times? I wonder if its "prime" function is based purely on pressure seen at the HPFP, and if it drops below a certian value (x), then it primes open seeing some defined activity with the vehicle?

Sometimes it will prime when you unlock your car.

Fernflex · 04-12-2011, 03:48 PM

to be continued!

Syndicategt · 04-12-2011, 03:52 PM

can't wait to see part III

shockin330i · 04-12-2011, 03:54 PM

Quote:

Originally Posted by Fernflex

to be continued!

I feel like I'm watching the harry potter movies all over again.... lol

phazedkid · 04-12-2011, 03:54 PM

Quote:

Originally Posted by mithiral67

This analysis does not prove that older pump performed worse due to age or that these pumps loss 11% productivity after one year. Only after a larger population test with control pumps confirmed to have similar productivity are allowed to have some sit for a year and some used day to day for a year and subsequent proof they vary would I place reliance on that conclusion.

+1
Also keep in mind that the 1 yr old pump is from Vishnu's shop car. It was probably working overtime from day 1.

Not saying all other pumps should be fine. We just shouldn't generalize the durability of all LPFPs from a sample size of 1.

Although I'll admit that I personally find it a bit alarming.

cstmx_ryder · 04-12-2011, 04:08 PM

04-12-2011, 02:33 PM	#24
Rob@RBTurbo Lieutenant Colonel 387 Rep 1,571 Posts Drives: '08 335I AT, '14 M6 DCT Join Date: Jan 2008 Location: St. Louis, MO iTrader: (5)	Wait, what kind of numbers did you get from the EKP in terms of it's peak output capabilities to the LPFP? (ie. Was 11v the best you could get out of it?)
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04-12-2011, 02:33 PM	#25
shockin330i Brigadier General 798 Rep 4,784 Posts Drives: 2016 ZCP M3 Join Date: Jan 2007 Location: f y'all, I'm from Texas (RGV) iTrader: (1)	subscribed. __________________ ERnie 2016 BSM/f80/ZCP
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04-12-2011, 02:43 PM	#26
secretsquirrel Colonel 130 Rep 2,291 Posts Drives: f80 Join Date: Dec 2010 Location: Far North Dallas iTrader: (2)	Subscribed. Setting my expectations on there being 4 parts so I wont be waiting for the climax to happen in part 3.
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04-12-2011, 02:44 PM	#27
bimmertt Lieutenant Colonel 93 Rep 1,794 Posts Drives: 2007 e92 335i Join Date: Nov 2008 Location: Earth iTrader: (7)	Is no one here concerned about the decrease in the LPFP performance after only a YEAR????
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04-12-2011, 02:47 PM	#28
chingy24 Second Lieutenant 2 Rep 207 Posts Drives: 3351 Join Date: Jan 2010 Location: USA iTrader: (8)	Great work Shiv!! Can't wait for part 3 and oh yeah that METH KIT!!! This money is burning a hole in my pocket.
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04-12-2011, 02:56 PM	#31
Brey335i Banned 113 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	I'm thinking 4 parts also. Part 3 will revolve around the various upgrades tested and the results. And then part 4 will be the conclusion that will most likely introduce a new Vishnu product
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04-12-2011, 03:04 PM	#33
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04-12-2011, 03:16 PM	#34
TurboSid Brigadier General 1114 Rep 3,261 Posts Drives: 2022 M4Cx BSM/FR Join Date: Apr 2008 Location: Florida iTrader: (4) Garage List 2008 335i [0.00]	product and price better be in part 3... otherwise i'll just be sad __________________ 2022 BSM/FR M4 Competition X-Drive 2017 MW/SO M4 ZCP [SOLD] • 2015 MW/SO M4 M-DCT FBO [SOLD] • 2011 AW/CR 335is DCT FBO [SOLD] • 2008 AW/CR 335i 6MT FBO [SOLD]
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04-12-2011, 03:20 PM	#35
Joshboody Lieutenant Colonel 65 Rep 1,708 Posts Drives: pickemuptruck Join Date: Jul 2009 Location: Phoenix, AZ iTrader: (7)	does the hpfp need the 72psi for its pickup, or is there some type of reservoir in the hpfp... ie larger volume that reduces pressure?
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04-12-2011, 03:21 PM	#37
mrquick68 Private First Class 17 Rep 126 Posts Drives: 2013 Audi S4/2015 X5 35d M Join Date: Sep 2010 Location: Kirkland iTrader: (1)	Great read Shiv! I'm excited to see what you come up with. As a side note, I don't hear my LPFP prime everytime i open the door. Only some times? I wonder if its "prime" function is based purely on pressure seen at the HPFP, and if it drops below a certian value (x), then it primes open seeing some defined activity with the vehicle? __________________ 2022 M3 Comp XDrive - BSM on Silverstone - CCB - Exec Pack - CF Buckets - CF Ext and Int package - KW HAS Kit - Awaiting Delivery 1993 Porsche RS America - Polar Silver on Black - 229 of 701. Motion Control Coilovers - BBS LMs - 993TT Big Brakes - Roll bar - Recaro Sportster CS's - Golden Rod/Rothsport SSK - Full Race Billy Boat Exhaust - ERP camber kit
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04-12-2011, 03:48 PM	#40
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04-12-2011, 03:52 PM	#41
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04-12-2011, 04:08 PM	#44
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