FYI

https://www.evolutionm.net/forums/sh...p&pagenumber=1

A post I started over 4 months ago titled "Change that fuel pump" . To his credit Al actually posted his recommendation to change your pump early on in this thread also. So this isn't exactly new:

Al wrote back in Oct 26:

Usually we don't see the need to upgrade the fuel pump till 290 - 310 whp - depending on the car

I would suggest that every one get the Walbro pump AND a in car fuel pressure gauge they are musts if you plan on doing mods

 

How much noise does this thing make? The reason I ask is because that pump in my 1G Talon sounds like a hairdryer in the trunk when the tank is half full, and is much worse in the summer for some reason. I even tried the rewire with 10 gauge wire thinking it was a current problem, but still that annoying whine. Also, does the is the stock FPR good enough to return fuel to prevent super rich conditions as this is a problem on other 4G63 powered cars?

 

Since there still isn't any real technical reason in this thread to swap out the pump, here's a link that should make it very obvious to anyone. I think it's self-explanatory.

Fuel Pump Flow Rates

 

Bump on this


"Also, does the is the stock FPR good enough to return fuel to prevent super rich conditions as this is a problem on other 4G63 powered cars?"

Al, with our custom flashes will we still be in proper tune with this upgrade or is it just going to throw every thing off. I distinctly remember in Houston after my street tune you had said that you had left a little room in my tune for a fuel pump upgrade. Really wish I could have brought the car to you with a fuel pump but money was tight at that time. Thanks for bringing this issue to our attention, both times

 

Tech Q

It's kinda obvious that the stock FP on the Evo isn't the same one from a DSM. If not, does it share the same flowrate as the 3KGT VR4? The latter sounds logical that Mitsu raid the parts bin to save on cost a bit.

 

A fuel pump is a definite must. I have only an afc and was tunning for an 11:1 afr with a wideband and I would hit fuel cut pretty quickly. I will be ordering a pump tonight and getting a flash in the near future.

 

How would it be obvious to you that it is not the same FPR as a DSM? Just because it may look different has no bearing on the flow characteristics

 

I would agree with you on 92tsi but why would a company change the look of a fuel pump just to recreate another with the same flow characteristics. would be more cost effective just to give it another part number for different applications. not sure i follow the logic for changing the looks but not the flow rate. granted it could look different and be different. seem the best idea would be to get the info for that pump from the maker.

 

I was responding to the earlier post by bahamut. I have no idea about the flow of the FPR, but he made the statement he felt that it was obviousley different. I was just trying to state that since it looks different does not mean that the flow is different. My fear is that we put these bigger pumps on our cars to try and avoid lean conditions, but we end up running into FPR overun thus causing very rich conditions secondary to the rising fuel pressure on the fuel rail because the FPR cannot return enough fuel back to the fuel tank. This is a problem that many DSM owners have battled. Any insight from Al would be greatly appreciated. I have no doubts that if Al says that a pump is needed, I'm all behind it. However, my concern is by having this pump is it going to play host to a whole new set of problems, at least for those of us with relatively few mods that are not going to be running out of fuel very easily

 

Do you know some DSM'er upgrade their FP to a 3KGT VR4 since it flows a bit better than the stocker. It's a cheaper route for low budget. Nevertheless, it's probably the same for the E4-6. The E7-8 shouldn't be any different in the fuel delivery from its predessors.

http://www.dsmreviews.com/dsmreviews.php3?category=6001

http://www.stealth316.com/2-fuelpumptests.htm

http://www.roadraceengineering.com/f...pflowrates.htm

As for overruning the FPR, that usually don't happen, unless ill tuning or bigger injectors.

 

Sorry, but I was not referring to the fuel pump. I was referring to the FPR(fuel pressure regulator). This is where the problem lies as DSM fuel pressure regulators could not handle the extra fuel on the rail, as they could not get enough fuel back to the tank. This results in higher than normal(and desired) pressures on the rail, and with these higher pressures, the injectors move more fuel per pulse, and you end up running very rich.

 

My original Q was about FP (fuel pump, not fuel pressure or about FPR). If I had shortened it, it would have been "fuel PSI".

When I talk to the lancer guys, I used the term GSX FP as a parts replacement. Ask HK or Rhyzin . . . used "GSX FP" for more than 2 yrs now.

 

We dont have a regulator problem

In our case its the pump - when they get super hot and overloaded with high boost many of them are somehow starting to flow less suddenly which is a very unsafe situation

 

So Al, upgrading to the Walbro 255 from Nino's will not mess up our custom tunes?

 

bump diddy bump