Fuel pressure drop/going lean above 5k

Fuel pressure drop/going lean above 5k - Modular Fords

Unless the OP finds something wrong with his regulator, I might start by replacing the pumps with new equipment first. The dead pumps are the ...

fuel pressure dropping at boost...running lean on dyno - RX7Club.com

Sounds to me like the pump isn't keeping up with the demand. I would check the wiring of your pump. I would also check that you reinstalled the ...

Frustrating fuel pressure drop issue that I can't figure out

if its over running regulator when you set your base pressure it would drop it when there is high flow trough the injectors. Save Share.

running lean at 5k rpm and up what to do??? please help out.

ya you might. I running 460cc injectors and max them out at 10-12 psi on a 15G turbo. Up the fuel pressure a little. That makes a difference.

help. running lean after 5k rpm | Lexus IS Forum

Raising the psi significantly above this will cause them to work outside of their range. ... but my tuner said once i up my fuel pressure i should ...

1g leaning out at idle and passed 5000rpms under boost

Your probably maxing out stock injectors, also i dont think the stock fuel pressure regulator is strong enough for 255lph pump. :confused:.

Going lean @WOT - LS1TECH - Camaro and Firebird Forum ...

Without a boost referenced regulator when you're at 10lbs of boost your pressure gauge may read the same but the engine is seeing less fuel ...

Need advice...going lean over 5k rpm - the Pelican Parts Forum!

Yes that is the effect. The WUR will dump fuel starting at ~0.3bar causing the midrange to be very rich. The RPM switch is plugged into the vac/ ...

Please!!! Why am I leaning out after 5k RPM? - Honda-Tech

I have an ls/vtec build that when I go over 5K it leans bad and cuts out. I have 360cc injectors. We kept throwing fuel at it and it did nothing.

still going lean after 5k - Turbo Dodge Forums

I tried putting in my adjustable fuel pressure reg, setting it at 56lbs and still no difference. ... lean above 4500 to 5000 rpm, with ...

Losing fuel pressure at higher rpm, can't figure it out [Archive]

Pressure will pretty much drop from 43 psi to pretty much 0 if I keep pushing it. I also had a leaking fuel regulator out of the box so holley ...

Need help! car runs lean over 4k rpm. - NASIOC

If fuel pressure is correct then the injectors could be static, tune off, etc. Its an engine its cut and dry, it needs fuel, spark, and air so ...

Lean and loss of fuel pressure - Maxima Forums

The research I found points to either leaky injectors or fuel running past the regulator back to the tank which may indicate a bad fuel pump..

LGT running extremely lean high rpm/boost - Tuning - LegacyGT.com

But, on to the 2nd problem, the tuner was still running out of fuel over 5000 RPMs, and attributed it to a leak b/t the MAFS/TB or mechanical ...

Fuel Pressure dropping off above 3k rpm / any boost RB26

Well, something is drawing a lot of current or your alternator is disabled at WOT based on the drop in battery voltage which seems to match your ...

Car leaning out after 5000rpm - Skyline Owners Forum

fuel pressure 3 bar vac disconnected, fuel pump could be tired, what boost are you running when it leans off? www.japspeed.co.uk · http://www.

Fuel Pressure Dropping on Dyno Run Why? - ThirdGen.Org

The car is leaning out thats why the pressure is turned all the way. The car just needs more fuel because the pressure drops. Pressure is turned ...

Lean under minimal throttle - Fitech EFi Tuning Forum

My pressure is right around 50PSI at idle, but runs great. Another problem might be the pressure regulator itself bypassing too much fuel if you ...

HELP!!! Lean in High rpm's - Honda-Tech

Goes lean from 5k rpms and up no matter how much fuel I add in the map. I have replaced fuel filter twice, watched fuel pressure and voltage as ...

need help diagnosing a problem..running lean - MY350Z.COM

If you had an injector that was clogged it would not cause a drop in pressure. That injector would be using LESS fuel so it would actually cause ...