Has anyone ever used an EVO 9 Fuel pump, and at how much boost/power?

[MarkAngelo05]

I just bought an evo 9 fuel pump... does anyone have any experience with the pump???
will be pairing it with 650cc injectors/safc

thanks in advance for the help!

Mark

 

[Zmann42087]

You can (and I did for a while). If you want to skip the AFPR purchase for now, then go ahead. But ultimately I would obviously advise towards a purchase of a trustworthy AFPR.

Thanks for the help and advice, Anthony. I just bought an EVO VIII fuel pump from a guy on EVOm for $25 shipped.

 

[dnhieu]

my only first hand experience is with a rewired 190 on a stock fuel pressure regulator. it took some time but the 190 definetly over ran the stock fuel pressure regulator...

 

[Zmann42087]

my only first hand experience is with a rewired 190 on a stock fuel pressure regulator. it took some time but the 190 definetly over ran the stock fuel pressure regulator...

What are the symptoms of an over-run stock FPR?

 

[bling5tatus]

IIRC you will run rich under high load because the stock fpr can only hold back so much fuel pressure from the pump.

 

[Zmann42087]

Found this very helpful information posted by Martin Musial at AMS. Thought I'd share it..

Well to put things to rest we've taken the initiative and built our own fuel pump test rig and conducted a series of tests. If anyone has any pumps to test let me know and we'll have Chewbacca run it on the test rig.

We're basically using a variable voltage power supply to run 12V and 14V to different fuel pump configurations. The pumps feed into a fuel pressure regulator and we measure the bleed-off at that pressure. We fill a graduated & calibrated container and track how much time it takes to fill, then with a simple calculation you get flow in liters per hour (LPH).

For starters the base fuel pressure in a stock fuel system is around 42psi, then it goes from there. For every 1psi of boost you add 1psi of fuel pressure. So at 20psi you're running 62psi of fuel pressure. At 28psi boost, 70psi fuel pressure. 40psi of boost, 82psi fuel pressure, and so on.

We learned a few interesting things, especially with the EVO VIII & IX pumps. The EVO VIII pump has a pressure relief valve that opens up at around 65-68psi and the flow output drops dramatically after that, eventually going to zero flow around 75-80psi. The IX pump flows a little more than the VIII pump at lower pressures but doesn't dump the flow at higher pressures. That's the reason you can make decent power at higher boost levels with the IX pump.

We also found that if feed one pump into another (series), the flow only drops slightly through the pressure range. The first pump is feeding the second pump and the second pump doesn't have to work as hard.

The best choice was the twin Walbro 255lph HP external pumps in parallel, meaning both pumps feeding the regulator.

The twin Walbro 255lph HP in-tank pumps in parallel was interesting. If you notice the flow starts dropping off at higher pressures and actually starts to get close to the performance of just one 255lph HP external pump over 90psi. The in-tank 255lph HP Walbro pumps have a pressure relief valve that starts to dump flow at roughly 85psi and the output flow drops.

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So according to this, the EVO VIII pump I just bought has a pressure relief valve that opens up at 65-68psi. A 2g DSM has a base fuel pressure of 43psi so that means (assuming a 1:1 fixed rate) I'll only be able to build 22-25 pounds of boost before the fuel pump relief valve actuates. That kinda sucks. I was worried about over-running the stock FPR, but maybe I should of gone with the EVO IX pump afterall.

 

[wishihadatalon]

how much are these selling for? Both the 8 and the 9?

 

[DSM_NOOBIE]

how much are these selling for? Both the 8 and the 9?

I bought my EVO 9 MR pump for 30 bucks shipped

 

[Zmann42087]

how much are these selling for? Both the 8 and the 9?

Cheap, real cheap. There are so many EVO guys modding their cars to hell that these things are a dime a dozen. I bought an EVO VIII pump for $25 shipped, but now I'm looking at buying an EVO IX pump as it flows substantially more than the EVO VIII pump (see the flow chart I posted above).

 

[xi Talon ix]

Will the Evo VIII pump "bolt" right in place of my stock 1g fuel pump?

 

[1fastlaser]

yes it will. I have one for sale out of my 05 mr, 15k miles on it. 20 bucks plus shipping@!

 

[xi Talon ix]

haha..thanks man but i just got one like 15 mins ago. i talked to a friend on the phone and he told me it would fit. but thanks for the info and offer.

 

[xveganxcowboyx]

No, it won't. It is smaller so you will have to use a hose clamp or something else to secure it and the electrical connectors are different so you will have to make a trip to radio shack. It will also help to hack up the rubber piece that holds the pump in so that it helps secure the VIII pump better.

 

[Kevin Jewer]

the EVO8 stock FPR bolts on to a DSM fuel rail (can't remember if it was a 1g or 2g rail), not sure if the 9s are the same. The only difference is the output line orientation. I can't remember for the life of me WTF I was testing or what the result was, but it was comaptible. That being said, you could easily pick up an EVO FPR for short money and avoid the AFPR expense.

 

[DSMunknown]

Should have thought of that before I bought my AFPR.

BTW, what is the base pressure for the EVOs?

 

[Kevin Jewer]

Same as 2g.

 

[romeen]

BTW, what is the base pressure for the EVOs?

I would be willing to bet that it is 43.5 psi like the 2G's. This has pretty much become the automotive industry standard.

 

[xveganxcowboyx]

I would really like to know which fuel rail it bolts to and if it truly flows more than the stocker. I'm a cheap bastard and don't want to spend $200 on a FPR, but I also want to go E85 which means more flow. Might just be the new popular budget mod.

 

[Kevin Jewer]

The 1g and 2g rail outlets may even be the same, I'm too old to remember. I wish I had more solid data, but the 8/9 pumps flow a lot, and we know that the 8/9 reg isn't over run at that level or the factory wouldn't use it. My EVO 8 regulator did NOT flow enough for a rewired 255HP though, as a data point.

 

[xveganxcowboyx]

That's good to know. I've also read in a few places that the evo's adjust voltage to the fuel pump based on flow needs. I wonder how much of their lack of over run is due to that and how much is the FPR.

 

[cheap90gsx]

would a stock evo fuel pump work in my 1st gen?

 

[xveganxcowboyx]

I hate to be the first jerk to say it, but SEARCH!

And to answer the question, yes it will. It is a little smaller and takes some minor modifications, but it is no different than fitting any other aftermarket pump. Easy as pie. I recommend an evo IX pump. It flows a little more and keeps it pressure past 65psi.

 

[93_tsi_fwd]

Bringing this back from the dead.

Is the evo9 fuel pump a direct swap on a 2g awd? or do I still need to do some fabbing to make it fit/work right?

 

[DSMunknown]

Bringing this back from the dead.

Is the evo9 fuel pump a direct swap on a 2g awd? or do I still need to do some fabbing to make it fit/work right?

The Evo 8 and Evo 9 OEM pump are a direct fit for the 2G Turbos. Now I'm just waiting on my Evo 10 pump to get to me so we can make a trio out of this upgrade.

 

[93_tsi_fwd]

Ok, thanks for the info.

 

[RoasT BeeF]

The Evo 8 and Evo 9 OEM pump are a direct fit for the 2G Turbos. Now I'm just waiting on my Evo 10 pump to get to me so we can make a trio out of this upgrade.

Almost everytime I come across an Evo fuel pump thread, here you are. And now getting an X pump?! Damn