Walbro 255 lph pump
 

Hi
I was just wondering if anyone has installed this pump to their rx8?
If so are they really noisey? I have bought one to replace my failing oem pump, but if the walbro pump is nosiey inside the car then I would rather just buy another oem pump.

Thanks

Antony

I bought and installed the DW200 pump from BHR. The buzz here on the forum is that the DW200 is quieter than the Walbro. I don't even hear any noise inside the cabin from my DW200, very quiet, works great!

When you turn on the key and it does it's initial prime of the system is the only time you will hear it . And it's kind of a cool sound so .......

Yes, many run this pump. The search function of the site works great. I have had the Walbro for years, no issues and I can't hear the fuel pump while driving. Sure if you listen carefully at idle you can hear it but it's not anything worth considering.

It doesn't make any sense to use one unless you have converted the engine from NA to FI ...

Maybe for the Series 2 pump which is better, but the Series 1 pump is flawed and prone to fail after certain mileage and under heavy load, and/or high heat conditions. Folks have found the Walbro and DW pumps to flow better under heavy load conditions and high sideways g-forces in hard left turns, and to be stouter overall, especially for any track driving.

It is not the first time in Mazda rotary history that there have been better fuel pump alternatives to stock. Trust me I have tried a bunch over the decades with my seven rotary cars. The series 2 pump seems to be a much better design and quality, which is why many Series 1 owners are making the conversion to it.

Truth. After 80k miles, swapping in a new DW200 made a noticeable difference over the stock fuel pump, after installation I had less vibration and a smoother idle.

Bullshit on the improvement unless your stock pump was on it's last legs then of course any new properly working pump would work better but then you are still putting a new pump into an old pump assembly.

The stock pump is fine for many many miles, they don't usually fail prematurely and even the autoparts stores sell OEM Aaram pumps with a brand new assembly so there is no need to mess with upgrading just the pump itself. The OEM pump will far outlive 99% of RX-8 owners time in the RX-8 anyway.

Well if it means anything my S2 pump just died.

How many miles? A certain number will fail of course no matter what, that is inevitable.

I'm at 70K KMs(Canada) still confirming it's the pump though. Happened yesterday. However, i'm fairly sure. Car misfired/loss of power and made a lovely grinding noise after I had just filled it up and was driving home when it happened. Just before though I was driving spiritedly with a low tank which I am guessing caused it to overheat. Going to check ignition with a timing light when I get home to rule out ignition. But I do have a BHR kit and new plugs so I wouldn't think it's that. Also too add, she's been running like a dream until just now. No start issues and frequently check my CAT. 90% sure it's the pump

Have you had the cat tested, sounds more like the cat to me and that is one thing that was not improved on the 09-11. Could be a few things though, need to be troubleshooted properly.

Haven't had the cat tested. How would you recommend doing that? Or would it be easier to test the fuel line pressure first to try and rule out the pump?

Thanks

The dealer does the test using their diagnostic equipment, it is called a catalytic efficiency test. You can test the fuel pressure though. This is for an S1 but the tests should be the same for the most part.

http://foxed.ca/rx7manual/2003mazdar..._S01_0191.html

Pretty positive my stock pump was in working order. Guessing it was going out then. Either way the installation of the DW200 did give me improvements with vibration problems during idle.

Mechanically ..............that makes no sense .

The truth is the stock Series 1 pump ,even when new, has problems with flowing during hard high-g left turns. Read the forum, many of our members who track their cars have found this to be so. Most who have swapped out to Walbro or DW pumps have noted they no longer have this problem in hard high-g left turns. So even if you don't believe these aftermarket pumps are any better than a new OEM pump, many do believe so from their own actual driving experiences. Why do you think many folks buy these pumps from folks like BHR and/or swap out their Series 1 pumps for Series 2 pumps. Because the Series 1 pump is flawed and not up to the standards it should have been for this car, that is why Mazda listened to Series 1 owners complaints and feedback and changed the pump design for the Series 2. No different than Mazda looking at worn and failed Series 1 engines and deciding the series 2 engines needed a return to that third oil injector (last gen RX7s had three injectors, Series 1 renesis engines had only two and excessive wear was shown in the middle of many Series 1 engines) . Improvements needed to be made and Mazda realized it. 'nuff said.

^this, sorry g. Pump starvation is not going to be improved with a bigger pump. That just means it will starve faster.


At idle starvation is not an issue. If he had low pressure from a bad pump a new one could make a differance.

The pump going out shouldn't cause a grinding noise. Was it from the pump location. If not its something completely unrelated. Fuel cut shouldn't t kill an engine unless your under boost maybe.

Ive been running a dw 300 for some time now and have not had my fuel get more then 10f above ambient. Im measuring fuel temp under hood so it should be at highest between engine heat and recirc heat.

I don't get how it doesn't make sense. :dunno: So maybe my stock pump was failing then because I had unusual vibrations at idle, swapped in a DW200 with the same stock pump assembly and vibrations were gone. Magic I guess. :scratchhe

When did you swap it? Were you running the ac and now you are not?

The pump pressure is restricted by the regulator. Any flow above needed gets bypassed right into the fuel tank. A new pump would not increase pressure or flow to the engine. It would only make a differance if your old pump was so horrible that it couldn't meet stock fuel demands at idle. If that were true it probably would stall out as soon as you tried driving.

It's in your head. just like the guys who claim that their idle was improved by adding 2 stroke to the gas.

Or you gain hp on the butt dyno from an intake

I swapped it around 80k. Could be nothing more than a fluke, could just be that I cleaned the sock as well, Which wasnt too dirty, most likely my stock pump was on its way out.

I had some weird issues which led to me replacing the fuel pump with the DW200. I have yet to hit that track or anywhere else on a 90+ degree day with a 200+ pound passenger where I can hard accelerate (as hard as a stock rx8 can) up to 100, brake hard for a left hand hairpin, accelerate back up to 100. Here is the thread.

https://www.rx8club.com/series-i-tro...-track-253919/

The dw200 was a fairly easy install and is pretty quiet. I sometimes can hear it and I'm like "oh yeah, the fuel pump". Its quieter than some of cheap fuel pump replacements and even walboros I have heard in Subarus.

I can also say the car didn't seem to stumble as much. I wasn't actually expecting it to run smoother as I haven't upgraded the ignition yet.

This thread has great info regarding the actual install.

https://www.rx8club.com/series-i-maj...-modes-176491/