car bogging right when i spray
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From: Allen Park, MI
Originally Posted by CAT3
Does it Bog everytime? Make a run, short or not, make sure your spraying then stop and go immediately go again. Does it still bog on the second run? If NO, then you have a purge issue/ if YES then you can rule out the purge.
Could be stock fuel pump.regulator playing catch up and just making a microsecond of leanness, the NXL kit did this when it first hit the market, nothing to panic about.
Could be stock fuel pump.regulator playing catch up and just making a microsecond of leanness, the NXL kit did this when it first hit the market, nothing to panic about.
i know i havnt given the best of details, because i really havnt had a lot of time to go make some pulls.
i can scan the o2 voltage next time i spray it. i dont have a way to get fuel pressure. when i do a run, ill post up what happens. i shouldnt have to work a double tomorrow too so i will do it tomorrow
Yea Cat , sounds like the stock fuel pump to me and its a "99" so yea .
I bet he is starving the fuel rails on the hit .
If it does it at various nitrous pressures then it has to be the fuel pump .
Get a phat intank pump and i bet the problem goes away .
I bet he is starving the fuel rails on the hit .
If it does it at various nitrous pressures then it has to be the fuel pump .
Get a phat intank pump and i bet the problem goes away .
Thread Starter
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From: Allen Park, MI
if it is the fuel pump, why would it only do it at a lower rpm and only on the first time i spray? if it is starving i would figure it would keep leaning out through the whole rpm range
No , its just on the initial hit of the nitrous .
I used to watch my pressure drop bad when spraying a 175 but then it would come back up .
Its a momentary thing .
And sooner or later you will need a bigger pump anyway .
I used to watch my pressure drop bad when spraying a 175 but then it would come back up .
Its a momentary thing .
And sooner or later you will need a bigger pump anyway .
mine does the exact same thing.. hesitates for a second and then goes perfect.. havent figured out exactly what it is but i have a 255 in tank walbro and still have the same thing... i think it might be the air in the line between the noid and nozzle being sprayed into the intake for a split second throwing stuff off..
well i had 2 kits on my truck a dry and wet and when i sprayed my dry it would bog and i was like wtf so i sprayed both kits from a roll and it was fine but i later noitced that when i sprayed the dry kit my air fuel would jump up to 17to1 real quick then i would get in to the wet kit and it would bring it back down to 13.1to1 when it should of been around 12.5 i wound up taking the kits off befor i coud put my fuel pump in i am pretty sure i was maxing out the stock fuel pump with over 500 to the wheels on lots of gas
