![]() ![]() The car went so rich that the car would barely run at WOT. I built the first double pumper set up and installed it in my RS. ![]() My main concern was ease of installation and I wanted to be able to keep using as many stock components as I could. ![]() At that point, throw the stock fuel tank out, put in a lightweight fuel cell. An EVO making that much power is laggy as hell, no fun to drive and is more than likely dedicated for track. No street EVO that I am going to want to actually drive is going to make that much power. Pushing fuel through a 5/16" fuel line you can supply enough fuel for 1,000 flywheel horsepower. I called the best in the industry and got some flow rates of what the factory fuel lines could handle. After careful study of the tank assembly and knowing I didn't want to hack into the factory wiring and didn't want to loose the factory fuel gauge I came up with an idea. My quest for a great double pumper(twin intank pumps) set up began. They are expensive and mostly, they just aren't needed. Evo x fuel pump evom install#They are heavy, there is no real nice way to install them perfectly on a car. Evo x fuel pump evom crack#They dry out and crack and are prone to leaking after about 5 years. Neither of us wanted to run AN lines, I do not like AN lines. Neither of us wanted to cut up our perfectly good EVO's to put in fuel cells. Datalogging fuel pressure it was simple to find the problem. This is where the testing started as my brother and I were both having the same troubles. I was running our adjustable fuel pressure regulator kit on the stock fuel rail. The car ran a 9.97 at 142.32 mph like that. I had 1200 cc injectors in the car running them at 100%+ duty cycles. I was able to run my EVO RS up to 542 whp on our dyno with the single Modified High Output pump we sell. My brothers car and my car both ran out of fuel. With the base pump out of the way now we can go onto our Modified High Output Walbro pump.Īt 60 psi this pump is good for 603 flywheel horsepowerĪt 70 psi this pump is good for 566 flywheel horsepowerĪt 80 psi this pump is good for 516 flywheel horsepowerĪt 100 psi this pump is good for 416 flywheel horsepowerĪs you can see, if you are running high boost this pump really flows up top compared to a standard Walbro 255. I was going to go into what happens with you bump the voltage of the pumps from 13.2 to 15 volts but most of you are not interested in doing that and it is going to make this post so long nobody will read it. What happens is people end up putting in a big injector thinking they are out of fuel injector and as the pressure is falling the duty cycle is being ramped up higher and higher. So for a high horsepower, high boost EVO it just dies up top. The higher the base fuel pressure is set and the higher the boost goes the less the pump flows. To make this easier I am going to break it down in another "chart":Īt 60 psi this pump is good for 600 flywheel horsepowerĪt 70 psi this pump is good for 553 flywheel horsepowerĪt 80 psi this pump is good for 475 flywheel horsepowerĪt 100 psi this pump is good for 260 flywheel horsepowerĪs you can see, as the pump falls off up top you can't make as much HP with it. As the boost comes up the fuel pressure raises 1 psi for each 1 psi raise in boost pressure. This really doesn't matter either as the car isn't going to run at 40 psi for long. So the first place to look is about 40 psi which is close to EVO rail pressure at idle, or your base fuel pressure. This is flow testing the pump at 13.2 volts. Here are the specs on that pump at boost levels that are important. Most every EVO shop that sells a Walbro pump for an EVO sells the GSS342 pump. With that said, we have done quite a bit of testing and such on the EVO fuel system.įirst let's talk about the fuel pumps. That's how we want treated and that's how we treat our customers. Today I finished up the last of what I needed to do on the fuel systems for the EVO.Īs anyone that actually knows anything about us knows, we pride ourselves on selling you what you need and what works more than just selling crap that isn't needed or won't work as well as something else we know exists. This is the longest we have waited to actually get the information out there from any testing we have done. Well we have been doing a lot of testing over the last 6 months. ![]()
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