UPDATE on Maxflo fuel pump kit
 

Okay, just a few minutes ago, on my way home from work, i decided to do some datalogging. I just reflashed about 2 days ago cuz i was getting a cel code p0421. I've had this about 4 months ago and decided to just delete it and see if it comes back. Just finished running 120+ miles earlier this afternoon.

Anyways, i did a 3rd-5th gear wot run. Everything looks good. I decided to just do that one run since i didn't want to over do it after reflashing. As i was heading home, i saw a gti with nice rims, bright blue headlights and some yellow fog lights, making swish sounds. So i decided to pull next to him to see if he's going to bite. As we were side by side, i hear him down shift so i downshifted..i looked at him and he looked at me for a sec, then he floored it. so off we go...he never gained on me and pretty much walked him from 5th gear..we did it again but the traffic wouldn't let us...so we pulled over and talked a bit.. he says has a stage 2 car (intake, exhaust, intercooler and tuned)...we decided to do one more run from third gear..

.it was pretty close through third gear, gained on him a bit on 4th, and i fucking missed 5th gear!!...he pretty much got me by a car by the time i got my act together...i started gaining on him and we were pretty much side by side, maybe he was ahead by a bumber, then my car jerked for a split second, then the motherfucker jerked again!!!...at this point the road was turning and we decided to call it quits...the guy gave me props cuz he knew i missed fifth gear..i didn't want to tell him that it didn't matter if i missed 5th cuz i was gonna catch him...and that the real reason he got me was i fucking had two cuts of some sort and the road was turning...i would've caught him easy...but i didn't want to be an ass and just told him his shit was fast...

Luckily i had the race logged on the AP so i know what type of cut i just had..i was driving home crossing my fingers and hoping that i didn't have a fuel cut cuz then that would just confirm that the 2nd set of CDI's fuel pump internals are failures.

GUESS WHAT!!!

http://i689.photobucket.com/albums/v...atalograce.jpg

MY MOTHERFUCKING FUEL PUMP CRAPPED ON ME!!! during a mother fucking race!!!...now the log before the race came out with gud results, holding 1700+ fuel pressure...

It's fucking official...these kits are bound to fail...by the way, i was one of the guys who used gasoline to lubricate the kit...but i think it doesn't even matter with these kits...i would be buying the kmd's soon..

Not as bad as when mine siezed on me.

I was going from 1st to second on a drag strip lol...I ran a 24 @ 55 on that run :D

damn, i can imagine the ride home.

i think something else caused that. these kits dont fail by going from 1700 psi to 300psi then back to 1700psi all in 100rpms.

thats fuel cut... not dropping pressure from a fuel pump thats losing pressure.

plus it looked like you cut at 130.84 on the log too... but pressure didnt fall. something weirds going on there.

sounds like a bad fuel pump kit :(

why... because he fuel cut? hes got good pressures in his previous run and then he fuel cut twice in the last run. you dont fuel cut like that when pressures drop... he obviously didnt seize.

trust me.. i think the cdis are often shit. but i dont think these failed tonight. maybe im wrong... but off all the logs ive seen... ive never seen a pump go good then bad then good again in 150rpms. thats fuel cut.... and failing fuel pumps dont fuel cut unless the fucker seizes.

wait, could it be because my ecu is still learning?...could it be because of the code? maybe i have a leak? i was thinking bout it too and thats why i decided to include everything that happened before the actual race so people can get the whole picture...should i give it more miles and test again...damn there might still be hope..

thats when i missed 5th gear...i think you're right, it may be a fuel cut caused by something...what should i do next?

no...it looks like you missed 5th gear a second after that in the 131's when your rpms shot into the 6700s and you let off throttle..

when a pump fails its all over the place.. you'll see 600's, 800's 1000's its more gradual and all over the place.

its not 1700 then one blip to 300 then 1700 again. 300-400s is less than idle. thats fuel cutting from the pump..

id log the thing a bit and see if it happens again and what induces it. i maight have just been a phantom cut becuase you reflashed and were under heavy load in a race for the first time.. who knows? but id want to see more before you call in the dogs just yet. id bet theres nothing wrong personally.

if you want to buy a kmd tho.. you know who to call..lol

Your still WOT at 130, were you flat foot shifting 5th?

you can see he misshifted 4th to 3rd around 131.97. this throttle dropped when he hit 6738rpms. that was over a full second after he boost cut at 130.84... and his pressures held steady.

this is true...now that i got time to think bout it and got some feedback, im leaning towards a fuel cut not a bad fuel pump kit...i just suspected the kit cuz it was the only thing in the car that i was not too sure of since it's reputation...i knew it was too early for a race after the reflash...but my dumb ass couldn't resist a fucking race with a nice worthy car...i really was hoping that these kits wont fail especially it made the 2 months mark..im going to give it a few more miles and short burst of wot pulls and see what happens...kmd will always be there anyways so im going to see what happens with these...

i was trying to put couldn't shift to 5th right away...it got stuck between 4th and 5th gear..i suck.

there just might be too many factors that could've affected this run...im going to do this shit again and we'll see..

did a few runs this morning...1st attempt from 3rd gear, i had a fuel cut...

http://i689.photobucket.com/albums/v...on/3rd-5th.jpg

I decided to do another pull @ 4th gear...no cuts at all...

http://i689.photobucket.com/albums/v.../3rd-5thII.jpg

did a 3rd - 5th gear pull...no cuts but had knock up to 1.8..

http://i689.photobucket.com/albums/v...3rd-5thIII.jpg

I actually did another 3rd-5th gear pull and letting go at 5th gear 5500 rpm...no cuts what so ever and had knock only up to 0.3 through out the pull..i didn't post it up cuz i accidentally fucking deleted it...but anyways...i think my pump is still good and strong..i was just getting some fuel cuts probly cuz i just reflashed recently...

im gonna be logging another 3rd-5th pulls and 1st-5th soon..

I never been so happy to be wrong....:loser:

My ltft from the very first 3rd-5th log is 2.96 through out 3rd and 5th...in the last log, my ltft is 2.96 @3rd and 0.16 through out 4th and 5th...

i think the car still adjusting cuz my fuel trim before reflashing was 1.4 through 3rd...0.16 through 4th and 5th..

http://i689.photobucket.com/albums/v...orereflash.jpg

what kind of map are you running on the AP? are you running one that has the fuel cut level raised?

Stage2+sf 93v103+TMIC....

couldn't help but get it right this time....3rd-5th gear pull...

http://i689.photobucket.com/albums/v...-5threcent.jpg

here is my question, and I dont know the answer so I will test this out myself. on a good pump if I am say at 1700psi fp....and at wot say around 5500 rpm.....and i let go of the gas momentarily the pressure wouldnt drop off drastically to 500 in less than a second....... correct?

I ask this because this is what I see in the logs........... I sincerely dont understand enough about how the ecu goes about "cutting" fuel , boost etc.... but at least I wanted to throw that out there for speculation.

correct...it shouldn't drop off that low.

then ask yourself this simple question. the only way pressure drops off from 1700 to 500 in less than half a second is through fuel physically having been stopped pumping.

Again I dont know enough to say with 100% certainty but seems one way would be a momentary seizure, another would be the flow of the pump being diverted back to the tank somehow as a precaution........ but even if say you are at wot and at 5500 rpm and for some dumb reason you turn the car off right at that moment...pressure still wouldnt drop off that fast because the camshaft is still spinning at speed and the fuel would need to bleed off before pressure could drop to 500.

like I said, this is only to bring another point of view..... I am not claiming this is fact.

good luck and keep us posted

my pressure never dropped below 1650 when i let my foot off the gas...you can see it in all my logs during my shifts...even when i missed a shift, it never dropped below that...my pressure only dropped while i was flooring the shit out of the gas pedal...why..i have no clue...

its a fucking fuel cut lenny. fuel would be cut off just the same way it is in the 10000000 other fuel cuts any of us have had over the last 3 years.

a pump that loses pressure is all over the damn place. there is no such thing as a "momentary seizure". when a mechanical cdfp loses pressure its shot... for good. it cant heal. adaptive ecu tunes can. they can adjust. this is in the tune. its not the pump. hes got a ton of logs that prove it.

maybe the pump fails today... but in the meantime quit spreading misinformation and heightening fear.

randy I am not spreading shit and honestly im sick and tired of you accusing me of shit. I am bringing up questions.... and what the fuck does one of my last sentences say???

"I AM NOT CLAIMING THIS AS FACT"

(and as far as once it seizes it's shot is bullshit, ask cameron about his cdi's how they went from seizing....to working awesome for weeks and ending up seizing a few weeks after that., mys have been magic I guess)

I am not stating what went wrong with decepticons car....I am only telling him to pursue all avenues for finding out the problem.

this is the last explanation I will make on my view point, I am not getting into shit flinging matches with you anymore randy. I want to see this work as well.

there's no point of arguing really cuz only time can tell...i really appreciate the input guys and the honesty...this is the only way people will get shit right when fucking with cars.

obviously... that would make it worse.

for those who is following this thread..i haven't had the chance to log like i said i was going to log because my ap took a dump on me...it had a fatal error...i just got it back today and decided to log to see if my fuel pressure is still holding up...first i did a 3rd to 4th gear pull...then from a stop 1st to 4th gear...then 1st to 5th gear...all the runs feels great...but from the data..it shows that my fuel pressure would dip down to 1400...i don't want to jump into conclusions and say my pump is crapping out...but here are the logs...

3rd to 5th gear

http://i689.photobucket.com/albums/v...centlog3-4.jpg

1st to 4th

http://i689.photobucket.com/albums/v...centlog1-4.jpg

1st to 5th

http://i689.photobucket.com/albums/v...centlog1-5.jpg

after i installed my kmd internals and had flashed a new map i would get a drop in fuel pressure, i just reflash the map and everything went away.. and runs get. just opinion.

I have a maxflo pump in my garage with a worn and cracked retainer cap after only about 5k miles....

i haven't flashed recently..the last time was about 3 weeks ago...i flashed before then and would get some cuts...then a day later every thing is gud...pressure never going below 1600...i haven't done anything else since then but just drove normally.

okay..just did a quick 3rd-5th log this morning...was about 73degrees out...wtf man..now everything looks just about right...i'll probly do more logs later on when i have the time...till then..

http://i689.photobucket.com/albums/v...centlylog7.jpg

another 3rd to 5th...dipped down to high 14's...which i think is not too bad but this never happend before...i might take a look at the pump tomorrow morning...my idle pressure has been lower too...390-410...which is not too bad either but i used to idle at 425...mmmm...might be getting the kmd's soon.

http://i689.photobucket.com/albums/v...ecentlog12.jpg

just keep an eye on it. youre making me nervous just thinking about your heart rate with all the datalogging...lol

id do a visual log once a day, and if you ever see a drop below 1200-1400 its time for a new set. at this point they look like they are still doing great.

Remember... even if the pressures are dropping down to stockish pressures... these upgrades are supplying 50% more fuel than stock at that same pressure!!

and as long as the pressure at the rail is over 1300-1400 at all times... then the car is still getting a pisston of fuel.

remeber that!!

im not saying that this pump is gonna last forever... you may eventually want the kmd. but in the meantime... dont stress about it SOO much. you could get 20-30k more miles on the set you got in there. who knows. just keep an eye.

man...i've been in such a rush all day long with a combination of adrenaline, nervousness and paranoia from all this...i've been thinking of all the variables...could outside temp have an affect on the pressure directly or indirectly?...cuz last night when i logged it was 89 degrees...this morning when everything was gud and strong it was 73 degrees and holding 425psi @ idle...this afternoon when i logged again it was about 87-90 degrees and pressure dropped at 370-390 @ idle and dipping to high 1400psi....now its about low 80's and my pressure @idle is back up to 425...i bet tomorrow morning if i log again...it will be perfect.

you're right...i need to stop stressing, it's not like it's seizing where pressure is all over the place...and it still holds better than my stockers.

okay...my paranoia is down...i a couple runs...im not going to post them up cuz im getting tired of posting them...outside temp 81 degrees with 80% humidity...first run...BAT 144...3rd-5th...pressure dipped to 1441 for less than a sec early in 3rd...the rest is above 1550...i drove a lil bit to get my BAT down to 120...second run of 3rd to 5th was strong...lowest pressure was 1615...i think im still good.

i think my BAT was high during the runs that had low dips on pressure..that can be a factor...Can humidity be a variable? i don't know...im still a noob.

again, i think im still good to go...i will update again in a couple weeks.

good. if you want to do something profitable... quit logging, and remove the pump to inspect it. you'll be able to tell if the cam follower is getting jacked up and you can see if anything is bent or deformed. the cdis worked, but they fail long term from wear. the kmds dont seem to have the same problems of wear on our cars as working cdis.

main thing is to relax. your pump is functioning 50% better than anybody in the country with your mods, and still on the stocker. thats something to feel good about. and when it fails, or if it fails... im gonna be right here.
you'll have a story to tell, a new set of kmds overnighted if needed, and then no worries again.

CONFIRMED...the Maxflo internals failed after 3.5 months...about 3K+ miles...i took the pump out and decided to service the internals since i've never lubricated them with oil...i found out the the retainer clips have finally gave in...it is logged in the spring...i will post some pics as soon as my camera charges back up...despite this failure...the pump still actually was holding pretty darn good...i think i just caught it at an early stage of its death...lolz...i think it's not the whole kits that is flawed but simply just the retainer clips...they are very weak compare to the stock ones...the stock is solid.

i think alot of the previous failed kits was due to lubrication errors and the clips are too weak for the tension of the spring...especially those with the high rev springs...but i think the rest of the parts are pretty good even comparable to the kmds...i just hope the kmds hold strong down the road cuz it looks like their clips are similar to the cdi designs...but i think looks stronger and it's a different material...

as far as mine kit..im going to lube them with oil and swap my other clips from the previous cdi's and see if that holds...hopefully that will give me atleast a month until i get the kmds...if that shit don't work, im going back to stock...

i will post pics soon...i will also see if i can make a better clips for these shits...i really think my kit is still very good..it's just that the clips have failed them...

I am running the Maxflo internals fully bolted minus a turbo manifold just fine. Cobb AP Stage 2+ SF FMIC 93oct. I don't have any issues and I watch my FP like a hawk every day.

good...i believe they are still good...but the retainer clips fail....im in the process of fixing it....i'll have pics later...