easing off the throttle instead of side stepping...

[1STGENFARMBOY]

My truck does it bad at the end of an 1/8th, the dang thing will barely get back to the pits. but if I can keep my head and ease
off it's fine.

[BC847]

I've had that issue since running PDR "190" injectors with a LPLP. Single turbo or twins changes nothing. Had it with DDP4s and a regulated HPLP. Had it with Schied 6x.016s. Adding a regulated Walbro 392 lift-pump with AN6 supply and AN8 return lines didn't stop it. Swapping in a NOS VE doesn't help. Altered case-pressure doesn't help. What I call high-lift DVs doesn't help. Going to flow-honed 5x.018s doesn't help.

I recall reading that it's also an occasional issue with the P-pumps.

In my experience, it only occurs when, the turbo(s) are at full-song under a full throttle. Then lifting off the throttle like you just passed a road-sign, and dang-it, there's a cop behind it running RADAR. SOB!!
You can hear it missing. Giving it fuel has the engine stumble big-time . . . if you're lucky. Often, the engine dies and you have to burp the injectors to get the heap running again. Glowing turbos and all.

A mild instance is illustrated in this BS video I got here (It's a How-To vid I made a while back. Work with me. ) You'll notice the symptoms as I pull off the track . . .

http://www.youtube.com/watch?v=womcEaptXJU

[cmann250]

There's a asswipe Genius over on another forum who swears the A1000 pump fixes that issue. (He is full of sthi IMO BTW). He, and his minions, believe the injectors becoming air-bound, is caused by cavitation in the IP. I'm sorry, but that is not possible . . . period.

I, for one, am far above raking someone over the coals who is not present to defend themselves, even though that person is wrong.

IIRC the VE operates at the lowest pressure of any common pump in the light duty market. At 3500-4000 rpm and 50+ psi of boost, I can clearly see where a piston coming up can shove air in an injector. It would take a split second.

But that being said, I've never done it. I try to be nice to my FSS and perhaps the marginally larger non-IC piston bowl drops the cylinder pressure some.

Of course I've never seen 4000 rpm or 50 psi of boost either

[BC847]

I can clearly see where a piston coming up can shove air in an injector. It would take a split second.

It's at that point he calls you an idiot hence, no lost love on my part.

But I respect your position.

[Remps]

I made my W250 stall once (not on purpose) sidestepping it when a light turned red. Luckily I had my 11/16 on the seat. Jumped out, cracked 4 lines, cranked it till it squirted, retightened the lines and had her running before the light turned green.

[RCCUMMINS89]

There's a asswipe Genius over on another forum who swears the A1000 pump fixes that issue. (He is full of sthi IMO BTW). He, and his minions, believe the injectors becoming air-bound, is caused by cavitation in the IP. I'm sorry, but that is not possible . . . period.

I, for one, am far above raking someone over the coals who is not present to defend themselves, even though that person is wrong.

IIRC the VE operates at the lowest pressure of any common pump in the light duty market. At 3500-4000 rpm and 50+ psi of boost, I can clearly see where a piston coming up can shove air in an injector. It would take a split second.

But that being said, I've never done it. I try to be nice to my FSS and perhaps the marginally larger non-IC piston bowl drops the cylinder pressure some.

Of course I've never seen 4000 rpm or 50 psi of boost either

In BC's defense.... he never said who/what/where. However...Caleb.... you are coming from the right direction and have the right mindset IMO.

[fatty]

He doesn't have to say who it is. The guy is such an arrogant tool I'd say most of us knew who he meant right away.

Other than that, my brother Soggy runs an A1000 and had the same problem many times with 6x16. I think he said since he had the engine rebuilt and a reman IP along with SDX 5x18 it doesn't do it anymore. I'll ask him since I'm not positive on that.

[xohcef]

Edited, and sorry

[AHineman]

^^^^

Sent ya a pm.

[RCCUMMINS89]

Is it nixon?

Just so future readers don't get the wrong impression... no, that's not who folks are talking about.

[fatty]

Is it nixon?

If you have to ask... Probably not.

[Sutter1stgen]

I'm still getting symptoms at the end of the 1/4, even with my airdog. It's not as bad, but still noticeable.

Not side stepping is the only real cure. But when you have to backup at the end of the track, because you didnt get off the skinny pedal soon enough, it can be a little embarrassing. Hahaha.

[BC847]

NO, it is NOT Mr Nixon.

I wish I hadn't said anything now.

[1STGENFARMBOY]

I'm still getting symptoms at the end of the 1/4, even with my airdog. It's not as bad, but still noticeable.

Not side stepping is the only real cure. But when you have to backup at the end of the track, because you didnt get off the skinny pedal soon enough, it can be a little embarrassing. Hahaha.

get back in it and drift around the corner...

[cmann250]

I'm not quite sure how a lift pump gets lumped into the equation here.

Yes, pressure in does have to do with pressure out. Consider this: 15 psi is dumped in the case. Then the fuel is pressurized again by the vane pump. Finally the fuel is compressed again by the head and rotor. The injection pressure is something like 13-15,000 psi. I struggle to see how input and output pressures differ logarithmically, yet input pressure is so critical. Heck a VE will draw its own fuel if it has to.

In my opinion, if anything, I think folks dropping pop pressures to "cheat" more fuel into the cylinder should go back to the drawing board if this air binding is such a nuisance. Especially with large turbos or twins. There's a lot of inertia there, relatively. BUT, if you have twins and lowered pop pressures, you are likely aware enough to let off the throttle slowly.

This is why my stuff is "stock"