Jump to content
SAU Community

Will Car Run With Bigger Injectors

ARTZ

By ARTZ,
in Engines & Forced Induction

 Share

Recommended Posts

ARTZ Grand Master

ARTZ

Posted
Posted (edited)

Ok so i put bigger injectors in last week (no i havent put new ecu in yet, and yes i know it needs one) and just out of interest i fired it up to see if it would run..

And it did it sat and idled away perfectly maybe with a slight miss but good enough that i thought i wonder if it will drive (albeit very gently) so i can get it to the shop...

Well it got till the end of the block ok, and then started running like shit, now it will barely idle. you know that running on 5 cylinders styles.

what i am wondering is this just because of the injectors, and if so why did it idle and rev so cleanly before i tried to drive it

Or should i be looking for something else maybe??

I cant find any leaks , though there was a small amount of smoke assume is just wd40 or something

Was hoping it may run so i dont have to get a towtruck to the shop...

Edited by Arthur T3
Link to comment
https://www.sau.com.au/forums/topic/339674-will-car-run-with-bigger-injectors/
Share on other sites
blind_elk Grand Master

blind_elk

Posted
Posted (edited)

Larger injectors will, obviously, deliver more fuel.

At idle, there is virtually no load on the engine, and the fuel delivered by the ECU is only slightly more than is necessary. Even free-revving, there is very little load on the engine, so the additional fuel from the bigger injectors is able to be coped with by the engine.

When you start driving, the load on the engine increases, and the ECU delivers more fuel. The bigger injectors deliver even more fuel, and the mixture becomes super rich and doesn't burn correctly. So you end up coating the plug electrodes in fuel, and the plugs don't spark efficiently.

Edited by blind_elk
ARTZ Grand Master

ARTZ

Posted
  • Author
Posted (edited)

ok that makes perfect sense then...

there was a huge layer of soot on my exhaust when i got back so no doubt on my plugs too..

So if i cleaned the plugs off it would probably run fine again until i tried to drive it...

damnit Towtruck it is then...

Cheers... :)

Edited by Arthur T3
JonnoHR31 Grand Master

JonnoHR31

Posted
Posted

also most bigger injectors have a higher latency than standard injectors, so at idle it can even out and run perfectly (fluke) but as soon as you put any load on the motor it'll be way too rich. as said, your plugs will be fouled

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • Marek
      Hi everyone.

      By Marek · Posted

      Haha, i kow right? Could have bought so many cars for the same amount of money (or less) but driving Unicorn gives you at least +1mln to style 😅. Like wise man said "life's to short to drink cheap wine and drive boring cars" 😉
    • ARB26
      S1 Autech 260RS Wiring Diagrams

      By ARB26 · Posted

      Newbie here, proud owner of an Autech 260RS. I'm on the hunt for wiring diagrams specific to the 260RS, particularly S1. I've ran my eyes through R33, R34 Diagrams, there are some similarities, however continue to find incorrect wire colours and pins on connectors in the 33,34 diagrams.   I was hoping someone could point me in the right direction? I'd be happy to pay for the originals in Japanese. I can translate them, at least they would be accurate.   Any help please would be greatly appreciated, never heard an RB26DETT before let alone driven one, and I've got a spaghetti monster of goodness to sort out.   Cheers Benny  
    • DanMac34
      R34 Speedo not working after manual swap

      By DanMac34 · Posted

      Hey all  im wondering if you can help me please I have put a rb20 box in my r34 gtt as my auto packed up and a friend had a spare box I know it’s not ideal but it will get me up and running for now. we have done the conversation and everything is working great but my Speedo we got a s13 speed sensor but my Speedo reads double now and I bought a speed converter but still not having any luck.  so I thought I’ll reach out and pick your brains  any help would be appreciated please as I wanna drive my car again 
    • joshuaho96
      Speed Sensor replacement

      By joshuaho96 · Posted

      Drain it. I got official Matic D but you can get whatever is listed as Matic D compatible.
    • QB6SAGR
      Tein Circuit Master- rebuild worth it?

      By QB6SAGR · Posted

      Thanks guys,  Yeah I should at least have them dynoed, at least then I know what I've got as a starting point.  The springs on these are hard as rocks. I vaguely remember Russman saying he was going to sell the shocks to me with the rocks fitted, as he was keeping the softer springs for his new setup.  I didn't click at the time but of course that was to let me know the shock/spring wouldn't be matched.  I also remember pricing up new springs around 2014-15, but, house, money etc. it never happened. So that was another reason to have them rebuilt. I have rebuilt the forks on many motorcycles so I think I could handle the seals on these easily enough, but getting the valving right would be a rabbit hole I cbf exploring.  Duncan, interesting to hear RP was tuning these back then. I might give them a call.  In the mean time I have been busy fitting sway bars. The Whiteline rear sway bar I purchased 15 years ago finally got fitted, along with the Whiteline front bar that showed up last week. Just waiting on new links for the front sway bar to finish that off.  And my spare set of advan AVS VS5's should be back from the powder coaters in a Pearl White finish sometime this week, with a set of Hankook RS4's lined up for fitting.  And then I just have all the suspension bushes to do. A comprehensive kit is on the way... Lots to do before the Ararat hill climb. Cheers guys 🍻   
×
×
  • Create New...