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Topic: 19's not enough 24's too much ???? (Read 1834 times) previous topic - next topic

19's not enough 24's too much ????

so im running lean in my car with the stock 19's from the car. now my brother and old man.(carbd guys but know some stuff about the coputer cars) say it's the injectors. mostly bc they know i have the 24's and wont put them on bc it's mostly stock it dont need that much fule. but they insist that it will work no matter what i have read heard seen on the internet/maags. in person. these two jack's are right everyones wrong.  so to shut him up. i put the 24's in  and now dont even think about sitting behind the car for more than 5 seconds bc your eyes burn. and the sar spudders like all hell. i now i need the computer to have a chip or the aftermarket meter. but i am corect right 24's would be tomuch for a mostly stock car. i have bumped up the fule pressure with the 19's but . i think the reason it may be lean is the 02's are bad and have seen their day. and or the egr is off creating my high Nox level. so now i have to spend a few more hours out of my day to take the upper off and throw my 19's back on.

Erik
trick flow street heat intake , 24lbs injetors, ported GT-40's (Chip) long tube headers. and a Performance Automatic C4, with a hurst shifter!

Re: 19's not enough 24's too much ????

Reply #1 –
sounds like you would greatly benefit from a dyno tune.  I doubt that the 19's are not enough injector for a mostly stock engine.  How do you know your car is running lean?  Have you put a wideband on it?  I'd say get the car tuned properly, and see where you stand with that first.

Rick

Re: 19's not enough 24's too much ????

Reply #2 –
19's are proven to be enough to flow up to 325hp. After that the 24's are required. It does sound like your idle and driveability problems may have to do with the O2 sensors. Also, if you're trying to use a MAF meter calibrated for 19's with the 24's, you're not going to idle well anyhow. The injectors and MAF meter must match; the computer for the most part will compensate for them both.

Re: 19's not enough 24's too much ????

Reply #3 –
Well if the O2's are messed the car will run rich so u might have nailed that one.
Another easy way to see if the car is running rich is Pull the plugs and see if there pure black thats a dead give away.  If there rich u cna try advance timing a bit and open the spark plug gap a bit.  IF time is retarted or to smal a plug gap u will get a weaker burn and it will run rich.

Very easy to do and best part is its free to do it and try it.

Re: 19's not enough 24's too much ????

Reply #4 –
befor i switched to the 24's the car was idleing fine  but from looking at the plugs it was running lean. so i bought the fpr. and thought that was good but it was still lean looking at the plugs. so i think my o2's are bad causing the lean condition. or my injectors are cloged up. or my fule pump cant keep up at a higher rpms leaning the motor out. bc with a fule gage hooked up and i hit the gas it drops pressure. what ever it is it's putting my NOX threw the roof  at 200 over the legal limit.  also the intakes were gummed up so im gonna shoot some TB cleaner as it's catalyst friendly. or do the old watter trick and steam clean the engine
trick flow street heat intake , 24lbs injetors, ported GT-40's (Chip) long tube headers. and a Performance Automatic C4, with a hurst shifter!

Re: 19's not enough 24's too much ????

Reply #5 –
dont put to much water or hydrolock can happen

Re: 19's not enough 24's too much ????

Reply #6 –
in case anyone cares, Accel makes a 21# injector but you'd have to use a mass air calibrator from Interactive systems & technologies to tune your mass air for it.

  I bet you need either a fuel filter, a new pump or to stop relying on what your plugs look like.  :canada:

Re: 19's not enough 24's too much ????

Reply #7 –
What are your mods on this motor? You may actually be running too much fuel.... What's the pressure at with the vacuum hose disconnected?
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

Re: 19's not enough 24's too much ????

Reply #8 –
i know it's too much fule bc. the car backfires in the s now when i let off the gas. my mods are simple 65 tb. dynomax catback stock size 2.25 and fms headers that were on the car b4 i got the car. and 2 cats are busted out. also done b4 i got the car.  with the vaspoogee line off it's like 40 or 42 i cant recall rite now but when i hook up the vaume line it drops to stock size..

blakct: why stop relying on what my plugs look like wouldnt that be something to judge whats going on in they chambers.
trick flow street heat intake , 24lbs injetors, ported GT-40's (Chip) long tube headers. and a Performance Automatic C4, with a hurst shifter!

Re: 19's not enough 24's too much ????

Reply #9 –
I know this is a silly question, but have you done an HO conversion?  If not why would you be running 19 pounders at 40  PSI with exhaust and TB as your only performance mods.
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

Re: 19's not enough 24's too much ????

Reply #10 –
Back the pressure to 35 PSI after you clean those injectors.
-- 05 Mustang GT-Whipplecharged !!
--87 5.0 Trick Flow Heads & Intake - Custom Cam - Many other goodies...3100Lbs...Low12's!

Re: 19's not enough 24's too much ????

Reply #11 –
The 19lb injectors are enough for any NA stock headed/cammed 5.0... Reinst the 19s, CLEAN your Mass Air meter sensor wires, set the fuel pressure to 40 psi(vac line off) and it will be fine.

Re: 19's not enough 24's too much ????

Reply #12 –
check your fuel filter(s) and change the o2 sensors as well, for the few bucks if the other ones are old it would be good to do anyway.

Re: 19's not enough 24's too much ????

Reply #13 –
i was also thinking about the pump. would a 190 hour fule pump be good on my car bc i do plan on adding my gt-40 heads probably in the spring  and a cam  so i would like to have the pump ready for the swap

by the way thanks guys for the help and info. i got the 19's back in today and bout some fuleinjector cleaner (tanks stuff.) added a bottle now and gonna add another after i get gas. i also sprayed the hell out of the upper intake while it was off with TB cleaner. and also after i put it on to clean up the intakes  it seems to run smoother threw the rpm range when i rev it .  oh is tb cleaner safe on the mass air meter i know it's sensitive
trick flow street heat intake , 24lbs injetors, ported GT-40's (Chip) long tube headers. and a Performance Automatic C4, with a hurst shifter!

Re: 19's not enough 24's too much ????

Reply #14 –
Quote from: CougarCoupe88
is tb cleaner safe on the mass air meter i know it's sensitive


The best way is to remove the sensor(two screws) from the housing, and clean the sensor wires with some electrical contact cleaner. If you are vert careful alcohol and a Q-tip will do a good job. It's how I cleaned the MAF on the wifes Grand Marquis a couple of months ago. It had gotten so lean, it felt like it was a 6cyl.