Jump to content

Help on injectors!!


Recommended Posts

  • 1 month later...

Non .. there is no horsepower to gain just by swopping 4 injectors, it's more than likely you will loose power.

An injector works by a voltage signal being sent from the ecu. Each voltage corresponds to a pulse time and flow (duty cycle) telling the injector how long to open for and how much fuel to flow.

If you go putting a larger injector into your engine without programming the pulse and duty cycles the ecu will presume the injectors are the same flow and not make corrections for the amount of fuel.

I.e

when a standard injector flows 295cc @100% duty cycle at w.o.t and full boost (6psi),

That's all kinds of good fuelling.

If you take an uprated injector that flows 550cc @100% duty cycle and the ecu asks the injectors for 100% duty. Well, you can imagine the outcome.

Link to post
Share on other sites

Non .. there is no horsepower to gain just by swopping 4 injectors, it's more than likely you will loose power.

An injector works by a voltage signal being sent from the ecu. Each voltage corresponds to a pulse time and flow (duty cycle) telling the injector how long to open for and how much fuel to flow.

If you go putting a larger injector into your engine without programming the pulse and duty cycles the ecu will presume the injectors are the same flow and not make corrections for the amount of fuel.

I.e

when a standard injector flows 295cc @100% duty cycle at w.o.t and full boost (6psi),

That's all kinds of good fuelling.

If you take an uprated injector that flows 550cc @100% duty cycle and the ecu asks the injectors for 100% duty. Well, you can imagine the outcome.

Link to post
Share on other sites

I know that maybe I didnt ask the question properly, my question was what is the power gain after swapping the injector and fine tune the emanage for that particular injector.

Your still not asking the right question

Again the answer is no power gain

Unless you change something else to require that extra fuelling potential

Phil

Link to post
Share on other sites

Your still not asking the right question

Again the answer is no power gain

Unless you change something else to require that extra fuelling potential

Phil

Hi Phil,

Sorry im not arguing with you im just trying to increase my knowledge. when you said something else you mean an uprated fuel pump or is there some more things that need changing?

Link to post
Share on other sites

Hi Phil,

Sorry im not arguing with you im just trying to increase my knowledge. when you said something else you mean an uprated fuel pump or is there some more things that need changing?

No

Prob

Have a read

http://www.physics247.com/physics-tutorial/turbochargers.shtml

Engine is basically an air pump

You want more air moving threw it faster to make more power. Your fuelling just needs tuned to match the air flow.

So you need more air if your going to make power from Additional fuel.

Phil

Link to post
Share on other sites

basically ....


we cant tell you what power you will gain from injectors and a mapping session for multiple reasons:-


1. the air temp on the day does effect how much power you will produce allbeit a small amount 1-2 hp sometimes 5 max


(i work very closely with canems ecus and his dyno is actually at my work, ive seen first hand a hp figure change from first thing in a morning to mid afternoon when the air is hotter ettc)


2 your general engine setup, clutch, flywheel, gearbox, boost level, engine health, plugs,fuelling


3. what fuel your using and where yoou got it from


4 the mapper himself/herself


5 the dyno.


the list is endless and can get even more tedious



but iirc about 260/270 is easily producable on a td04 4e with injestors and a good map.

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...