im currently runing the P2 with custom set ups for the current upgrades that i have ..
i want or plan to upgrade to the walbro 255lph highflow , well they be any issues ??
Since i have read that the car runs a bit more richer with the pump (some have even commented that it also affects at high rpms)
Do i need to get flash again or will it be just fine????
Thanks guys
I really enjoy the P2 no complains , just want to be save by addint the fuel pump...

 

I am wondering this as well.

 

an can you benefit from running the SAFC II as well ??? to adjust

 

We have found the stock fuel pump to work very well with P2 flashed cars. In fact the stock fuel pump can provide enough fuel for most upgrades.

The fuel pump you mentioned should work fine with the P2. A reflash should not be necessary, however you may want to look into a fuel pressure regulator to keep the fuel pressure at a suitable level.

Good luck.

 

Tyler, that goes against what other tuners are saying. The stock pump can drop output at higher boost levels in the upper RPM range, especially with hot conditions. This has been seen on a few Evos on the dyno. An upgraded pump is cheap insurance. It's not a question of pump failure, but unstable output.

 

At this point with the Evo there are only two tuners that I trust and only two tuners that I would buy from, one is the WORKS and the other Buschur Racing. While the WORKS may not be as far along in component development, DB is way out there already and making some top notch modifications.

DB doesn’t change the fuel delivery system until stage 4 and my god look at what stage 4 includes! When this issue was first brought up by those other (2) tuners I asked a couple trusted mechanics for an opinion and got the same answer from both, if a fuel pump is “unstable” its more than likely bad and if its bad its going to show up in a pressure test and I have heard of one or two Evos that had bad pumps.

I don’t think Tyler’s answer (or WORKS engineering ideas at this point in their development curve) is in conflict with anyone else out there; his answer was it’s not a problem with current WORKS modifications or most other mods out there. I think the WORKS brain trust will readily agree that with mods like a DB stage 4 that’s its much more than just insurance, it would be a required upgrade.

Rick

 

Thomas, keep in mind that when you get the 255 High Pressure you really need to buy a new FPR because it's just too much pressure for the stock FPR to control. I recommend going with the regular 255 (GSS342) unless you really plan on making over 475 + HP.

 

This issue has been covered here before by DavidV:
https://www.evolutionm.net/forums/sh...aded+fuel+pump

 

I'm getting my 255lph sometimes this week. I'm sick of getting fuel cut.

 

Bat, you trust Buschur but Dynoflash and Buschur now offer their combined stages plus flash. I guess they call it fireball. If they recommend the upgrade, I believe them. So does Shiv. They tune cars day in and out and see firsthand what's going on. They don't sell the pumps, so they have no financial gain by it.

I myself don't really feel the need for it, but I am going to be tuned next month and it's a perfect time to have the A/F tuned to the new pump in case of future upgrades. It's a direct replacement swap with no modifications.

Besides, I don't see WORKS offering different flashes and fuel maps for those of us that get new mods. It's a "one size fits all" flash and I am suspect of that. So I trust tuners that take into consideration every mod and eash car is different. has any Evo pump failed during a tune, I don't think so, but outflow cannot be trusted at high boost and load conditions. I will take the $90 insurance policy for my $7000 plus engine.

 

Vishnu only started recommending the pump after his trip to Colorado where he saw first hand that the pumps could not provide enough fuel for the cars that had aftermarket cams. This had to do with the elevation. So Vishnu now recommends that a pump should be used for his stage 1+ cars as a safety net.

After I installed the pump, I swear my car is running a lot richer.

 

Sin - my family and our family friends racing heritage goes all the way back to a time when motorcycles and cars raced on wooden board tracks, some where champions in the old BCRA in the bay area (several raced at Indy and won in the pre and post WW II era).

I raced drag bikes in the NHRA before they even had classes for motorcycles; I guess you could say I was a pioneer in that area. When I could afford it I started building and racing midget dirt cars myself, my first year I missed Rookie of the year in our region by one position, after that I regularly put the car in the top ten on any given Saturday night.

I’ve had one Rookie of the year in my car, one Regional champion and one USAC national champion pilot my car, I’m a good builder but a so so driver. My next endeavor is to race the Evo in Autox; this is my rookie year for that.

When someone like DB says an upgraded fuel system is required for his stage 4 setup that’s easy for me to understand, but when someone says I need it for an engine that’s basically operating within stock parameters I say hogwash, and with that I can sleep very easily at night.

We may have never turned wrenches for a living, but we’re sure as hell not impressed by everyone that does!

Rick

jj_008 - That makes a heck of alot more sense to someone like me too.

 

What does racing drag bikes have to do with Evo fuel pumps? I tend to agree with you about the stock pump not needing to be upgraded until you are running high HP, but all of a sudden Shiv and Al who don't agree on much are now RECOMMENDING the fuel pump as a safety margin, not that it's necessary. Al even said that 99% of the time the stock should be fine.

Yes, the cars do run richer with the pump especially in boost where the high flow pump just pumps away. I did not install my pump yet, but I am looking for an excuse not to install it because I don't want to mess with something that's working fine right now. Maybe i should install a fuel pressure guage to see if there is any flucuation in pressure during load conditions.

 

…actually everything when you ran what would eventually become top fuel, no fancy blower kits or anything like that back then, no celebrity tuners or Internet to turn to, you had to design and build your own parts.

Next time I’m in Sin City I’ll take ya down to the Ihop and buy you dinner on my senior discount card.

Rick

P.S. And while were there I’ll tell you the story about a friend of ours from Orinda California that built the first and only twin engine all wheel drive Porsche powered, STP sponsored car (in his garage) back in the sixties to run at the Brickyard. His regular day job had nothing to do with cars either, he worked for a utility company, Pacific Gas and Electric.

 

...want to believe it or not, more and more OWNERS are testing themselves and finding the OE pump to be inconsistent under sustained heavy load.

David replied to a post that he has a flash for the stage three now.