fuel injectors on a n/t

[schultz9008]

i was just wandering if it would be stupid to get bigger fuel injectors if im not going with a turbo, and also if i get bigger fuel injectors do i need a bigger fuel pump i just dont know much about fuel injectors as far as how big i can go and that sort of stuff if someone can help me out that would be great thanks alot

 

[VelocitàPaola]

Remember, it's called an air/fuel ratio. If you're not moving any more air in (i.e. with a turbocharger), you won't need any more fuel.

 

[gudz519]

stock 420a injectors are 190cc if i am correct so unless you do some major modding there is no need for more fuel

 

[schultz9008]

alright thanks see this is why i asked so i didnt go spend all that money on injectors and fuel pump thanks alot guys

 

[crazyboy81]

What if you have a header and cold air intake, but also a port/polished head with bored out intake and exhaust ports? More air is definately moving, I can hear it by the sound of the engine. Would a bump in fuel delivery be a good idea? I bought my car this way. Im a new guy here at Tuners.

 

[Kyle97-clipse]

No, you won't need bigger injectors with a non turbo. When I bought my car it had 310cc injectors in it compared to the stock 190cc injectors. I took the advice from the guys on here and put the stocks one back in and didn't notice any difference between the two. In other words the bigger injectors were no different so you would just be wasting money and time.

 

[lee07]

i bought a 95 talon and was planning on port/polishing my intake manifold as well as opening up my exhaust manifold because i cant run headers at the circle track that i race at. I was planning on adjusting the air and fuel mixture when the cars on the Dino, or am i just wasting my time and i should i just buy different cams?

 

[Kyle97-clipse]

Well different cams would help and as for adjusting the A/F ratio the stock ecu isn't really going to let you do that. I would look into MS or the howell AFX ecu if I were you

 

[Fotowntalon]

unless you are hitting around the 200hp range with a na you dont need bigger injectors.

 

[VelocitàPaola]

What if you have a header and cold air intake, but also a port/polished head with bored out intake and exhaust ports? More air is definately moving, I can hear it by the sound of the engine. Would a bump in fuel delivery be a good idea? I bought my car this way. Im a new guy here at Tuners.

"Hearing" more air flowing isn't a valid method of measurement. By changing the cams or valves and porting or polishing the head, you're adjusting the velocity of the air, but not the mass flow. In other words, it's disingenuous to say "more air is moving" when in reality, it's the same amount of air, it's just moving faster. At this point it would probably make more sense to remove fuel and adjust the spark timing curve to make the most amount of power.

It's impossible to achieve more than 100% volumetric efficiency (VE) without a turbocharger/supercharger or a highly tuned intake manifold (via Helmholtz resonance).

 

[crazyboy81]

gotcha, thanks for all the replies