Ok gang - here is round 2 of the fuel pump testing - once again customer watching to verify everything is on the up and up - Pruven doing the dyno work

Here is a guy with only AEM intake - 3" exhaust - Hallman MC and started today Runs 2 & 3 with the base through the mail Fireball 2 Dyno Flash as he drove into the facility and a STOCK FUEL PUMP

Runs 4 & 6 (5 the o2 sensor fell out) are with the Walbro 255 lph fuel pump added - all other settings identical

You can see once again - even though this particular clinet's car was running a fairly rich 10.8 /1 consistant a/f with the stock pump (working fine) adding the Walbro pump cost him about 15 - 20 whp on top and caused him to go so rich it was off the dyno's a/f chart - at least a whole point richer

To sum up - same result as the last dyno test we did yesterday

IF you have the Fireball 2 and you change your pump you need to upgrade to Fireball 3 or you will running around very rich up top and loosing power

 

Another cool thing about this - is we once again showed that the base through the mail Dyno Flash gets amazing results - within 7 whp of the final result and a very safe and smooth power band

This is the AEMBOO3 base tune for those who want to order it

 

Hi DynoFlash!

Thanks for posting this info

I've just upgraded the fuel pump on my EVO IV (which has a 120 l/m pump as standard LOL!!) to the Walbro 255 l/m one. It is on it's standard ECU, but I plan to increase the boost on it next week on a rolling road with lamda etc.

What I wondered is, have you any data about richening of a/f ratio on Evos running the standard ECU?

Also (as you know the IV has 510cc injectors not 560ccs) how far, in your experience have you pushed the standard injectors e.g. what boost/bhp, or do you know what boost/bhp can be achieved with e.g. 80% duty cycle on 510cc injectors?

Any help appreciated

Rog

 

Are you going to post dynographs showing the fuel pump difference on the stock ecu and pump with mods vs stock ecu and walbro with mods? I would love to see the results.

 

Hey Al, I just called and left ya a message. Basically I just got my reflash in today (thanks for the super fast service ) I listed in my mods list that I had a upgraded fuel pump. Well it did not come in yet. Soo can I run the flash with the oem pump for now? Or will this cause me to go lean. My wideband took a **** so I will not be able to verify my a/f's.
Thanks
Terry

 

bumpity

 

You can drive it - ONLY - if you stay off boost 100% (I am quiet good at that with my car acutally since its only tuned for race gas and I usually drive to the track on pump gas)

IF you boost it it will go about 1.3 points lean - NOT a good idea

 

Thanks, I guess I will run 110 octane this weekend

 

Ok, here we go. Just had my car on the dyno over the weekend, and before all the goodies went in, I had them run a baseline on my stock Evo. Then we installed the Walbro and we put the car back on the dyno ... guess what? NO difference in AFR at all. I'm not going to start generalizing off just one test, although I will say that the guys at the shop I was at said that they have seen the same thing on other stock Evos (read: Walbro FP did not change the AFR at all). All I can say is that for my Evo the Walbro made no difference (other than being louder )

l8r)

 

I can see where it wouldn't in your case.
During the baseline pull the A/F fell off the bottom of the graph 2/3 through the pull.
This will be the case with most bone stock evos; they are factory tuned pig rich over 5500rpm.

You should have had the A/F tuned to 11/1 before the pump swap.
Then there would have been room on the A/F graph to show some difference.

 

maybe ... but the whole point was to get people to understand that on a bone stock Evo it really doesn't make any difference. Only if you have a modded Evo (and tuning for 11:1 is modded) or a failing fuel pump will the Walbro make your car appear to run richer ... but in those scenarios it's only because the stock pump doesn't keep up any more.

l8r)

 

I'm now more confused than ever... So WTF should I do??? Should I install the Walbro before Al comes down in July? Will Al be able to tell if my stock pump is okay? How hard/how much $$$ does it cost to swap the pump???

Al??? Are you there??? HELP!!!

 

I'm installing mine the week before he comes. Probably on Tuesday so that I can make sure it's working properly; and have time to get another if it's not.

I'm installing mine myself. There are plenty of shops locally that can do it too. Just don't install it and drive like a mad man before he tunes for it. Just try to stay out of boost as much as possible until the tune.

 

No need to get confused. My post was not intended to dissuade people from getting the Walbro ... far from it. Installing the Walbro is a good idea and a good precaution. It's not a difficult install (just messy) and it should take a good shop less than an hour to do it. As far as driving with the new pump before "tuning" for it ... as you can see from my dyno results, if your stock pump was working fine before, then with the walbro in there AFR will be identical. Even in a worst case scenario, which would be where your stock pump was starting to fail, all the Walbro will do is make you run richer (read: put the AFR back where it should have been) ... again nothing to worry about.

l8r)

 

installing the pump is SOOOOO easy it is ridiculous.....i have never changed a pump before and i just read the instructions from evomoto and it was soooo easy. just dont change the pump with a full tank of gas....wait till you have less than a 1/4 tank.

1) pull the back seat


2) take the cap off

3) remove the electric plug

4) start the car to purge the line

5) remove the assembly (this was a pain in the ***, but PATIENCE is a virtue)

6) remove the stocker, replace with walbro, and install


it really isnt that hard. go to http://www.evomoto.com/evo_tech.php