Car going lean above 4000rpm, DW200 failing already?!
Ive had my car together for a year now with no issues. Just yesterday I was driving and went to get on it, it felt like I hit boost cut. I turned the boost down and did another pull watching AFR and the car is going lean above 4000rpm in boost. I went part throttle around 10psi and sure enough once I got to about 4500rpm or so it started going lean again. I let the car cool down and went for another drive and this time it stayed rich until about 5500rpm, once I went to do another pull it got lean sooner, around 4500rpm again.
Setup is a Hydra 2.5 w/ DW200 pump and stock NB regulator, RC550's and a radium rail. At this point Im thinking its got to be the pump going out, Ive read that a lot of people have had issues with the DW pumps failing on them. I'm gonna do a datalog today to see what the ECU is showing. I didnt touch the tune at all, so its unlikely its tune related. I dont think its ignition related because the car drives smooth, idles well, etc. I can visually see the AFR going lean if I stay in it and of course then the car wants to completely fall on its face when it gets super lean. Has anyone had a DW 65c/200/300 fail on them this early? I went ahead and ordered a Whinebro 255 and a new fuel filter so I will update this once I get the new pump in the car and see whats what. |
My friend with a 04 WRX had been using a DW for a little bit. It kept failing on him after about 1-2 months. After 3 times of DW warranty replacing or repairing it they finally refunded his money. With all the issues I have heard from other people regarding DW products I wouldn't use them.
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Originally Posted by L337TurboZ
(Post 1533814)
My friend with a 04 WRX had been using a DW for a little bit. It kept failing on him after about 1-2 months. After 3 times of DW warranty replacing or repairing it they finally refunded his money. With all the issues I have heard from other people regarding DW products I wouldn't use them.
Back on topic, to me that sounds like your pump is struggling to supply enough fuel that is being asked for. Could be clogged fuel filter as well. |
Yea, Im replacing the fuel filter along with the pump. The car was literally perfect for a year and this kind of came out of left field. Ill update this thread when I put the new pump in. If that doesnt fix it then more diag will be necessary.
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Yeah I think they fail pretty quickly when they go. Could also be the afr sensor? Seems less likely though than the pump. Might be able to tell from the logs by looking at the PW? I have no real idea though, hopefully someone more experienced chimes in.
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Originally Posted by thebigtuna
(Post 1533840)
Yeah I think they fail pretty quickly when they go. Could also be the afr sensor? Seems less likely though than the pump. Might be able to tell from the logs by looking at the PW? I have no real idea though, hopefully someone more experienced chimes in.
My money is on the fuel filter, and then the pump. |
Originally Posted by albumleaf
(Post 1533843)
It's not the AFR sensor. He already stated that the car falls flat on its face when he gets into boost. If it was just a measurement problem, the car would still work.I'm going to assume that despite how shitty Hydra is, it doesn't allow for any sort of wideband-based fueling correction under real load.
My money is on the fuel filter, and then the pump. |
You said it's felt like Boost cut. Fuel pumps don't feel like a boost cut when they fail. The boost cut stutters. Description sounds like ignition, including going lean. Could be either though.
My DW is a 2012-ish and is still going. |
Is there a good way to visualize a misfire on a datalog, six? Or, does it just feel like it hits spark cut when you're overboosting?
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I don't know if there is, other than going lean and stuttering in boost. Try gapping the plugs down slightly and see if it moves the problem up the boost gauge any.
What coils are you using? |
Originally Posted by albumleaf
(Post 1533843)
It's not the AFR sensor. He already stated that the car falls flat on its face when he gets into boost. If it was just a measurement problem, the car would still work.I'm going to assume that despite how shitty Hydra is, it doesn't allow for any sort of wideband-based fueling correction under real load.
My money is on the fuel filter, and then the pump. Walbro will be here tomorrow along with an OEM filter so I will know soon enough. |
Originally Posted by sixshooter
(Post 1533873)
You said it's felt like Boost cut. Fuel pumps don't feel like a boost cut when they fail. The boost cut stutters. Description sounds like ignition, including going lean. Could be either though.
My DW is a 2012-ish and is still going. |
Originally Posted by sixshooter
(Post 1533965)
I don't know if there is, other than going lean and stuttering in boost. Try gapping the plugs down slightly and see if it moves the problem up the boost gauge any.
What coils are you using? |
Wouldn't spark blowout result in a rich condition due to unburnt fuel?
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Originally Posted by ridethecliche
(Post 1533996)
Wouldn't spark blowout result in a rich condition due to unburnt fuel?
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Originally Posted by concealer404
(Post 1534005)
Oxygen sensor, not fuel sensor.
Rish, combustion uses up oxygen. If the oxygen is still there because it has not been burned then the gauge will read lean. |
I guess I expected that it would be more of a misfire than something that resulted in a total lack of spark!
But yes, that makes sense. I had it backwards haha. |
Verdict : the dw200 is a POS. Dropped in the walbro and it's back to running like a good girl. Thew in a new filter too, but the old one was not clogged at all. So honestly I can not recommend a dw pump. I've never had a pump fail so quickly. It is more quiet than the walbro but that's about the old good thing I can say about it.
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Duty cycle is the same with the Walbro vs the DW200 so the pumps ( when working ) appear to supply the same amount of fuel to the engine. I loved how quiet the DW200 was and it was doing great up until it wasnt. I feel bad because I told two friends ( one going 2554R and the other going mp62 ) to get the DW200 and they already have the pumps and are installing them. I hope they have better luck than I did.
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My DW100 did not last long at all. The DW200 takes a long time to prime, but otherwise works fine. About 1 year of use so far. Return style conversion.
Re: duty cycles (presuming you mean injector DC), that is more your FPR than pump, unless you make an extreme change in pump size. |
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