walbro 190, how much psi?

[boostedbrian99]

I have a question on the walbro 190 fuel pump. I have done research on here about the walbro 190 fuel pump. I see that everyone is saying they are good for about 400hp. My question is what psi is maxing that pump out? My current set-up I have is a 99 gst. It has a BIG16G and a greddy rs Bov. Also a 3in cat back. I am running 16 psi. I would like to run about 20-21 psi on my rebuild. The thing is I dont know if I need a 255 and a FPR or just a 190. I see alot of forms saying the HP they are good to but not the Psi they are good for. Also the fuel injectors. Which should be perfect for 20-21 psi? I am getting a logger soon and I just need some help on the fuel system. Like before my goal is around low 20's. I am just afraid of getting the 190 and its only good for like 19 psi. Any help would be great.

 

[Cs4g63]

Go about half of the way down the page and there will be chart that will help you out.
http://www.roadraceengineering.com/eclfuel.htm

 

[boostedbrian99]

Thank you

 

[Cs4g63]

Not a problem.

 

[boostedbrian99]

So what I got from that chart is 93-94 octane 550cc and a 190lph fuel pump should work fine up to 21 psi.

 

[daren_p]

You can't give a specific psi where the pump will be maxed out as different setups & different turbo's will max the pump out at different boost levels. Depending on who you talk too you'll need somewhere between 40-44 lb/min of airflow to max that pump out. On a B16g you average setup won't make this kind of airflow at the level of boost you plan on running (B16g's usually max out around 42-44 lb/min but this is running 25+ psi, cams, SMIM, head work etc).

For your planned boost the 190 pump should be fine. As for injectors 550's will do, but won't last very long if you plan to go abit larger in the future. If you don't ever plan on going any bigger with your setup, go 550's as you will have an easier time tuning. If you think your goals may change, I'd step up to 650's. This is only if you are going with a piggyback system such as the SAFC. If you go with DSMLink, where injector size isn't an issue, go big (850cc +) so you don't need to upgrade again in the future.

 

[spyderturbo007]

This might help.

 

[boostedbrian99]

and just to make it clear the 190 does not need a FPR right? Also I hear alot of guys saying I need a install kit for the 190. Is that true? Thank you so much. I would just like to run 13's with this setup at 20 psi. Think that set-up would be fine?

Also daren p. said" Depending on who you talk too you'll need somewhere between 40-44 lb/min of airflow to max that pump out. On a B16g you average setup won't make this kind of airflow at the level of boost you plan on running (B16g's usually max out around 42-44 lb/min but this is running 25+ psi, cams, SMIM, head work etc).".

But this graph shows for 20psi ---Walboro 190lph

10psi = 46.48lbs/min
11psi = 45.89lbs/min
12psi = 45.26lbs/min
13psi = 44.58lbs/min
14psi = 43.86lbs/min
15psi = 43.09lbs/min
16psi = 42.28lbs/min
17psi = 41.43lbs/min
18psi = 40.54lbs/min
19psi = 39.60lbs/min
20psi = 38.62lbs/min
21psi = 37.60lbs/min
22psi = 36.53lbs/min
23psi = 35.42lbs/min
24psi = 34.26lbs/min
25psi = 33.06lbs/min

Says 20psi 38.62lbs/min. So does that mean the pump will or will not work. I am just alittle confused on the graph and how that all works, im sorry.

 

[spyderturbo007]

No, you don't need a AFPR with a 190, but it doesn't hurt.


As for Daren's comment, I'm sure he was assuming that you had a re-wired fuel pump which allows for much more flow. If you don't, then you NEED to rewire the pump.

As for the "way it works", our cars use a RRFPR. It stands for raising rate fuel pressure regulator. As boost increases 1psi, so does fuel pressure. Assume a base fuel pressure for your 2g of 43psi. Add 20psi of boost to that equation and now you are running the fuel pump at 63psi of pressure.

The higher the pressure the lower the total flow from the pump, which you can see by the change in airflow the pump is capable of supporting. This is another reason I advocate people watching airflow as the turn up the boost. No sense raising boost if all you're going to do is apply more stress to the turbo and fuel pump. Along with raising the temperature of the intake charge. The pump will be fine for your needs, but as Daren said, I would look into some larger injectors.

Daren is extremely knowledgable and is someone you can definatly trust when asking for advice.

 

[boostedbrian99]

so to reach 20psi I would need to rewire the pump?. You have any links of how thats done? Hard to do or real simple? so the diffrence from the 550 and 660 incjectors......would I need anything diffrent if I had the 660 injectors because there bigger or no? Sorry I have so many dumb questions just very new to these cars. You are the best thank you

 

[spyderturbo007]

Rewiring the pump is always recommended because the stock wiring isn't able to support the max flow of the pump. If you probe back there with a volt meter, you will only see about 11.5 volts depending on if your turn signals are on or not.

Rewiring the pump is easy, but it takes some time. The hardest part is getting the 10 gauge wire from the battery to the pump. Here is a great walkthrough of what you need to rewire your pump. It's exactly what I used.

As for running 20psi on your setup, you have some work to do. First of all, you will need something to compensate for the larger injectors, such as a SAFC. You should also open up your exhaust and intercooler piping first, pick up a logger and boost gauge, blah, blah, blah.

I know that everyone wants to immediately crank down on the MBC, but you need to take the time to learn what you are doing before you go making more power. It's not hard to blow something up if you don't know what you are doing. That's going to leave you with a mess.

 

[DSMunknown]

I also recently did the rewiring process on my Lancer Evolution VIII pump. You can read some of my comments here. If you have any questions, please don't hesitate to ask.

 

[boostedbrian99]

But if I put the 550cc injectors on will it still run right? Like they just push more fuel when its told right and stop when they are told? if I just put them on the car wont run right, right? or no.

 

[wvturbo2]

But if I put the 550cc injectors on will it still run right? Like they just push more fuel when its told right and stop when they are told? if I just put them on the car wont run right, right? or no.

Kinda hard to understand what your saying, but the car won't run right if you just drop those in. You need some sort of device to control fuel whether its safc, dsmlink, or some other

 

[DGajre777]

You can get a 190 fuel pump and run fine with stock injectors.
You can get a 255 fuel pump + an AFPR and run fine with stock injectors.

If you upgrade your injectors, you need something to control it - like SAFC, DSMLink, DSMChip, MAFT, ECU Plus, etc...

 

[boostedbrian99]

whats a good safc?

 

[DSMunknown]

whats a good safc?

Most people go with the Apexi Neo one or the SAFC-II (third one from the top in this link). You can also get a packaged deal here.

 

[boostedbrian99]

Here is what I am planning on getting from all the info I have heard. Tell me if this is good. 680cc injectors, SAFC Neo , And a walbro 190 fuel pump. And I am good for 20-21 psi right? Anything else I should include? For around 600 bucks in that package thats not bad I dont think. Thank you guys again your the best.

 

[Eclipse98_RS]

I wouldnt raise your boost til you do some internal work. Im at 15 PSI right now and wouldnt go much past about 17 psi with my car. Yes it can handle it, but probably not for very long. Maybe look at forged internals with some ARP studs and a different head gasket, maybe a Cometic. Then worry about what kind of other stuff you can upgrade. This way the ground work is layed for a really fast, built right car.

 

[boostedbrian99]

I just got a rebuild with forged pistons, different head gaskets, and better studs,....my Next question is ( this may sound dumb ) but with the apexi neo and a 255 fuel pump I still need a fuel regulator?

 

[h8r]

If the tune is good and the car is properly maintained there should be NO PROBLEM with 20 psi...as long as all the essentials are their...... I would do the 225 pump IMO... Once you get power you a;ways want more! Not to mention, I would much rather have a duty cycle of 75-80 precent then 90 or more..the 680cc's are a good choice. I hope you have a clutch upgrade in your future and an LSD while you are @ it...If you want her to hook at least! Good luck..Keep us posted!

 

[h8r]

I just got a rebuild with forged pistons, different head gaskets, and better studs,....my Next question is ( this may sound dumb ) but with the apexi neo and a 255 fuel pump I still need a fuel regulator?

YES...Sounds like you ae well on your way with a solid fondation judging from you recent upgrades to the bottom end..... I would go with a 50 trim since you have a stock bottom end.... Similar in price(unless you want a BB version)... Saves you the hassle of upgrading to a bigger turbo this first time one of those pesky AWD dSM gets ya! Gives you a bit more top end power!

 

[boostedbrian99]

I bought a new big16G off a friend last week and put it on. was only 200 bucks ( he needed money bad ) so thats what I have now. So whats the best regualtor the money?

 

[DGajre777]

Aeromotive makes good regulators. If you don't plan on getting a bigger turbo, stick with a 190 without an AFPR.

 

[spyderturbo007]

I wouldnt raise your boost til you do some internal work. Im at 15 PSI right now and wouldnt go much past about 17 psi with my car. Yes it can handle it, but probably not for very long. Maybe look at forged internals with some ARP studs and a different head gasket, maybe a Cometic. Then worry about what kind of other stuff you can upgrade. This way the ground work is layed for a really fast, built right car.

I don't know where you're getting your information, but the stock block can handle about 400WHP before you have to worry about internals. I'm running 22psi on the stock block, head studs and gasket. Tyler pushed his, all stock, to about 123mph in the 1/4, if I remember correctly.

So with the right supporting mods, you can definately crank down on the MBC as long as you have a good tune.