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Thread: Help with after market 30% injectors

  1. #1
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    Help with after market 30% injectors

    Added a set of 30% injectors (FIC), updated it with the data they provided. Started it up and took it for a blast and the car just sputters with moderate throttle. Full throttle sputters too. I was told we needed to address a couple other fields and we did. I was told the high side pressure can't be over 2700. I updated the tune and it still sputters at partial throttle and full throttle kind of goes in and out. It seems better but not there yet. Couple of issues, I'm getting knock out of no where and the fuel pressure still spikes around 3k even though I limited the tables

    GIO.CAMAROLT4.INJECTORSWAP.014.hplGIO.19CAMAROSSLT4.UPDATE.5.11.22.INJECTORUPDATE.014.hpt.

    All we did was change the injectors and spark plugs. Car didn't have knock issues before this and ran perfect.

  2. #2
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    Those injectors are junk , take them off and flow test them , you'd be surprised.

  3. #3
    Senior Tuner Ben Charles's Avatar
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    I’ve only been success on doing a few and other been so bad. Went back to stock and added meth and never had a problem

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    Yeah, I'm getting pretty close to ripping them off and going back to the LT4s. Before that does anyone have any suggestions on things to try first?

  5. #5
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    Quote Originally Posted by Ben Charles View Post
    I’ve only been success on doing a few and other been so bad. Went back to stock and added meth and never had a problem
    Same thing , they started well but then I don't know what happened to them .

    Best thing to do is going back to stock or move to another brand , I might give XDI a chance .

  6. #6
    Senior Tuner Ben Charles's Avatar
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    Have not had any issues with XDI

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  7. #7
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    I only mess with XDI's. I've heard terrible stories about the FIC's and refuse to even touch them.
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  8. #8
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    Quote Originally Posted by Ben Charles View Post
    I’ve only been success on doing a few and other been so bad.
    Didn’t mean to give you PTSD with my LPE injectors, Ben! Sorry! Lol
    2017 Camaro SS, Whipple 3.0, Mast LT Black Label heads, 112mm TB, LPE BB HPFP & LT4+52% injectors, Fore Innovations triple pumps
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  9. #9
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    Quote Originally Posted by JASON11WS6 View Post
    Yeah, I'm getting pretty close to ripping them off and going back to the LT4s. Before that does anyone have any suggestions on things to try first?

    Not that I know if this will help or not, but if I were in your shoes I would try these things:

    1. Reduce flow rate a small amount and see if the stumble improves. Maybe the flow isn't linear enough vs rail pressure. If this is true, this may just move the issue to another throttle area.

    2. Density Multiplier - Look at the area and rail pressure you see the stumble. Maybe you need to increase the area where the stumble is because there is too much fuel? Or possibly the opposite is true and you don't have enough fuel and you should lower the value.

    3.Pulse Corrections - Try lowering this a little bit. Logic would say the pulse length would be a bit shorter with larger injectors, maybe its running into a minimum pulse width boundary and doing something weird.

    4. Injector Offset - Seems like maybe similar to the Density Multiplier table but doesn't consider calculated Injector Tip tempurature.
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  10. #10
    Senior Tuner Ben Charles's Avatar
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    Quote Originally Posted by Joshinator99 View Post
    Didn’t mean to give you PTSD with my LPE injectors, Ben! Sorry! Lol
    Bahahah yess lol

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    Quote Originally Posted by Joshinator99 View Post
    Didn?t mean to give you PTSD with my LPE injectors, Ben! Sorry! Lol
    I had serious troubles with the LPE as well. They sent me a set and couldn't get any data and I had to give the serial numbers to the company that actually mfgs them. Car still never ran right either until we switched them back to LT4s

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    Is the consensus that either use XDI injectors and pumps or do a port system?

  13. #13
    Senior Tuner Ben Charles's Avatar
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    I use meth on most cars, or then Port…
    XDI haven’t let me down yet, don’t agree with how the data is done, but it seems to work, only flow rate is changed in the calibration

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  14. #14
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    FIC's are hit or miss, LPE's need more work but are supposed to be great. XDI's are by far the easiest.....but better order now so that you can get on that 8 week waiting list.
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    Quote Originally Posted by JASON11WS6 View Post
    I had serious troubles with the LPE as well. They sent me a set and couldn't get any data and I had to give the serial numbers to the company that actually mfgs them. Car still never ran right either until we switched them back to LT4s
    The lack of support by LPE for $4500.00 injectors is insane…
    2017 Camaro SS, Whipple 3.0, Mast LT Black Label heads, 112mm TB, LPE BB HPFP & LT4+52% injectors, Fore Innovations triple pumps
    1059 WHP, 944 WTQ

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    Finally got it all hooked up with a wideband and it's lean. During the pull it was sitting at 1.0 lambda and then only went down to 9.5 I think as I was getting off the throttle. Issue is the injector pulsewidth is already in the high 5s and low 6s. The high side pressure still seems to be spiking at around 3k and I'm wondering if that is causing the injector to spray inconstantly and causing an overall lean burn. I shouldn't need to add more fuel to this tune and if I did it doesn't look like the injectors would keep up anyway. I reduced the flow rate some already and lowered the value on the density multiplier and its about the same. What is a safe amount to play with on these tables.

  17. #17
    Quote Originally Posted by Joshinator99 View Post
    The lack of support by LPE for $4500.00 injectors is insane…
    Define support? They come with data and I have never had issues using their data. But if you do not know how to properly calibrate a 200+lb/hr injector that is not a manufacturer problem. Same goes with the XDI setup. Its not their job to teach you how to calibrate them.

  18. #18
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    Quote Originally Posted by yellz06 View Post
    Define support? They come with data and I have never had issues using their data. But if you do not know how to properly calibrate a 200+lb/hr injector that is not a manufacturer problem. Same goes with the XDI setup. Its not their job to teach you how to calibrate them.
    Maybe Ben Charles will jump in since he made an attempt to get these to work properly as well. The cold idle was/is trash with the LPE injectors. And yes, we used their data…all 27 tables worth. You do realize you can’t just wing DI injector data, right? Greg Banish’s courses were very clear on that. So we used their data and even tried tweaking that a bit. Cannot get any answers from LPE at all and Nostrum simply does not reply to any email or phone calls, period. If I had to do it again I would have went port injection right off the bat as the stock DI stuff is worlds better on the drivability front.

    Also, you’re incorrect on the XDI stuff, the tune is completely different vs LPE. You literally only change one table to accommodate for them in the tune (injector size). Absolute cakewalk to tune for vs LPE.
    Last edited by Joshinator99; 11-08-2022 at 09:14 PM.
    2017 Camaro SS, Whipple 3.0, Mast LT Black Label heads, 112mm TB, LPE BB HPFP & LT4+52% injectors, Fore Innovations triple pumps
    1059 WHP, 944 WTQ

  19. #19
    I moved on from aftermarket di injectors years ago. You'll never get them to run like stock injectors. The LPE data is way off. Flow rates are wrong. Offsets are wrong. They misfire at high rpm. With the affordability of the Too High PSI port kits, why bother.

  20. #20
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    The XDI injectors are a cake walk since they maintain OEM injector behavior. All I have to do is adjust the injector flow rate and then in some setups you have to adjust the high pressure table to keep the injector pulse width above their minimum operating duration.

    Awfully bold to be condescending about how to tune DI injectors. I don't think ANY tuner, regardless of how good, was able to set them up properly on the first few tries when having no experience with them before. Once you figure it out and have experience, I'm sure it becomes much easier, as does most everything.
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