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Old 05-05-2022, 03:58 PM
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I believe these units show commanded duty cycle. They rely on the wideband o2 to determine if what is being commanded is actually happening.

Here's the ****ty part of that equation. There's only a single sensor and it's usually on a single bank. If you have an issue like what gman005 had and it's occurring on the bank that isn't being monitored by the o2, all kinds of stuff can happen.

If a dual plane manifold is being used, the effect is somewhat less since opposing cylinders will typically be seeing the same throttle bore. If a single plane is used though, you get a couple dead holes at best, or a couple insanely lean holes at worse.

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Old 05-05-2022, 04:11 PM
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Is this just particular to the Sniper units? Surely the Terminator X(Max) and Dominator monitor pulse width on the injectors...

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Old 05-05-2022, 04:23 PM
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Anything running the Holley HP software should be recognizing actual injector pulsewidths. I know the software has that capability.

The Terminator is "upgradable" to the holley HP software, so it may not do that in its as delivered package. That's speculation though.

For this purpose we would be talking about the basic Sniper system. Though that's really speculative as well.

I know that the FiTech will read individual trouble codes for injectors. I don't know if it can read pulsewidth signal from the injector itself, but it at least knows if an injector isn't firing and which one/s it is.

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Old 05-05-2022, 04:24 PM
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Yes the Snipers have real time injector pulse width, well at least our super snipers do. You can data log it and even just watch it on the hand held touch screen. You can also watch or log duty cycle.

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Old 05-05-2022, 04:32 PM
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Good to know. And will be useful to the OP for verification his troubles are fixed, and don't come back...

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Old 05-12-2022, 06:07 AM
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I'm just waiting. I just want to drive the car.

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Old 05-12-2022, 09:09 AM
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They should've shipped you a new unit immediately when a brand new one was no good out of the box... Any ETA on when you'll get it back?

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Old 05-12-2022, 08:34 PM
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John, Mark Luhn is a person you know, I'm sure he could help you out as he is a Holley Rep for EFI, But I think he is a Big Piece **** Out there! I put an X flow on my car after he screw Wayne and I over my cars EFI, Beccause he and Tom Vaught sleep together and can do no wrong when it comes to EFI, message me I'll help I you any way way I can mine works really good so far .

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Old 05-13-2022, 09:28 AM
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I dealt with Chris at EFI System Pro in Florida. Excellent service, spends time on the phone with you to diagnose issues and always returns calls and emails.

He had some of the best prices around when I was shopping, and offered a discount when we bought 2 units. It wasn't a special, he just offered it.

He has a lot of tech info on his website and sells a lot of other related products. I'd recommend him to anyone. He also comes highly recommended on Holley's own EFI forum and does post on there from time to time.

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Old 05-13-2022, 04:53 PM
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Quote:
Originally Posted by Scott65 View Post
They should've shipped you a new unit immediately when a brand new one was no good out of the box... Any ETA on when you'll get it back?
Yep, the usual practice is to send a new unit with a return label so you can send the other one back.

Not sure why they didn't do that.

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Old 05-14-2022, 10:37 AM
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The unit I have I bought used from a member on the board.

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Old 05-17-2022, 04:50 PM
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I just talked to Holley and my throttle body is on the way back to me.

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Old 05-17-2022, 04:58 PM
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Good news

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Old 05-21-2022, 01:02 PM
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I got it back. Time to put it on and try it.

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Old 05-21-2022, 01:11 PM
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Hopefully it goes much smoother this time.

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Old 05-22-2022, 07:58 AM
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Well not so good. It still has a hard time idling and it is still running rich. The AFR is still at 14.9. I bought a new o2 sensor so ill change it and see what happens.

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Old 05-22-2022, 09:04 AM
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I'd consider 14.9 to be lean by a little on gasoline. (Just a little with stoich being 14.7) Do you have some reason to suspect a faulty O2 sensor? What kind of vacuum does this engine pull at idle? If you could post a datalog, I'm sure some of the folks here with the Holley software will take a look and help. If you have a low vacuum situation you may need some manual tuning of the idle area. You can have a situation where the O2 sensor gets "fooled" if things are way off. Also any exhaust leak ahead of the O2 sensor will cause problems.

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Old 05-22-2022, 09:26 AM
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All good suggestions from Scott.

I don't remember if you mentioned what this combo is but I find anything with a decent camshaft doesn't generally like idling that lean (14.9)

Exhaust leaks anywhere before the 02 can skew those numbers and make tuning a bit more difficult. And Scott is correct, on both of our Snipers I had to go in and manually tune the idle areas to get it where I consider acceptable. The self tuning will get you close if you command a reasonable AFR for the combo, but I found it could be better manually tuning in more precise increments and smoothing the fuel table.

You'll have to experiment with the idle AFR your engine likes by watching MAP (vacuum) Lower Map is higher vacuum and that's generally what you'll be trying to accomplish. Assuming the timing is dialed in, you'll have to move the idle AFR around to find what works best.

On ours, My 454 for instance with a 242/248 camshaft on a 110 LSA, and an RPM air gap intake and using a spacer, it tends to like about 14.2 on the Sniper AFR, which actually reads about 13.7 on my other AFR gauge. This gives me a MAP reading around 62-65. If I lean it out more it gets worse (number goes higher) and the engine isn't quite as happy.

Dad's 571 with a 261/265 cam on a 112 LSA seems to like about the same oddly enough, and idles with a 14.2 AFR at it's best MAP readings of about 65-67.


This is assuming you can get the car warmed up and set the TPS correctly.

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Old 05-22-2022, 09:37 AM
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FJ, do you know if there's a free version of Holley software that allows looking at datalogs? I'd like to check it out, and be able to help others. If the OP were to post a log, you could probably tell between the 2 you use if his idle pulsewidth is in the ballpark huh?

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Old 05-22-2022, 09:46 AM
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Here is a picture of the o2 sensor.
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