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Re: Super Sniper install [Re: AndyF] #2509205
06/16/18 01:42 AM
06/16/18 01:42 AM
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Downtown Roebuck Ont
Twostick Offline
Still wishing...
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I wouldn't get get too excited about idle AFR if your cam has any serious overlap.

Make it idle happy and let the AFR land where it lands.

My stone age 950 Commander TBI wouldn't idle consistently closed loop with an MP509. It would idles nice and clean and the next time you started it, it would barely run. We had to run it A/N to 1800 and have it switch to make it behave. Apples to oranges maybe compared to the new stuff but it just could not deal with low speed reversion.

I think this might be slightly less of an issue with port injection.

Kevin

Re: Super Sniper install [Re: AndyF] #2509209
06/16/18 02:00 AM
06/16/18 02:00 AM
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The cam I have isn't too big, it is around 240 @ 050 hyd roller and it idles with about 12 inches of vacuum. I manually adjusted the AFR at idle from 12.5 to 14.5 and the engine didn't seem to care. I adjusted the fuel map to set the idle at 13.5 and then turned closed loop and learn off below 1200 rpm. So I think that will work but I'm sure I'll need to keep an eye on it.

Re: Super Sniper install [Re: AndyF] #2509670
06/17/18 05:16 PM
06/17/18 05:16 PM
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I've been out for a few drives with the data logger turned on. It is interesting to get back to the shop and then look at the log on the computer and see how the AFR responds to the throttle position. I can watch the fuel pump pressure drop after I hit the throttle and then see it come back up over time. The coolant temp gets up to 180 and then drops a bit when the thermostat opens. Seeing all of this stuff sure helps to sort out any issues.

Re: Super Sniper install [Re: AndyF] #2509721
06/17/18 08:07 PM
06/17/18 08:07 PM
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Wichita
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Originally Posted By AndyF
I've been out for a few drives with the data logger turned on. It is interesting to get back to the shop and then look at the log on the computer and see how the AFR responds to the throttle position. I can watch the fuel pump pressure drop after I hit the throttle and then see it come back up over time. The coolant temp gets up to 180 and then drops a bit when the thermostat opens. Seeing all of this stuff sure helps to sort out any issues.


That's awesome. Hopefully, some day, I can put all of that on my hotrod!


'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.

Re: Super Sniper install [Re: AndyF] #2509743
06/17/18 09:45 PM
06/17/18 09:45 PM
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The data logger is built into the Sniper so you get data logging and EFI for $1000.

Last edited by AndyF; 06/17/18 09:45 PM.
Re: Super Sniper install [Re: AndyF] #2509750
06/17/18 09:51 PM
06/17/18 09:51 PM
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I built a new throttle bracket from stainless steel to line up with the wider Sniper body. It came out pretty good. Everything lines up and I can get full throttle with the stock cable.

DSC_2626 (Large).jpeg
Re: Super Sniper install [Re: AndyF] #2509929
06/18/18 12:12 PM
06/18/18 12:12 PM
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Here is a picture of one of the data logging screens that is built into the Sniper EFI. If you are really interested in tuning engines this is a fast way to see what is going on. I think EFI gives a person a good chance to really learn tuning since you can change things so quickly and see exactly what happens.

DSC_2658 (Large).jpeg
Last edited by AndyF; 06/18/18 12:12 PM.
Re: Super Sniper install [Re: AndyF] #2510033
06/18/18 03:35 PM
06/18/18 03:35 PM
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Spahn Ranch
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Andy do you think would there be any discernible difference in data between a manual trans and an automatic?


'71 Duster
'17 Ram 1500
Re: Super Sniper install [Re: RMCHRGR] #2510177
06/18/18 10:06 PM
06/18/18 10:06 PM
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Originally Posted By RMCHRGR
Andy do you think would there be any discernible difference in data between a manual trans and an automatic?


I can't think why it would matter. If you hook up a driveshaft rpm sensor you could watch converter slip on the data logger.

Re: Super Sniper install [Re: AndyF] #2510219
06/18/18 11:37 PM
06/18/18 11:37 PM
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NC, USA
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Andy,

Are you able to assess whether the Super Sniper on a dual plane is susceptible to more distribution issues than carb? There have been comments that TBI and DP are not a good match, I suspect based on at least that Engine Masters episode.

Re: Super Sniper install [Re: AndyF] #2510273
06/19/18 02:50 AM
06/19/18 02:50 AM
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I don't have any scientific way to measure that. I think you would need 8 O2 sensors to verify distribution issues and I'm not setup with that kind of test gear.

Re: Super Sniper install [Re: AndyF] #2510469
06/19/18 06:30 PM
06/19/18 06:30 PM
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I had a little bit of a hot start issue but Mopar Rich told me how to solve it. Short story is that the Sniper was set up too rich out of the box for hot starting. Rich told me to lean out the hot start so it is the same as idle and to open up the IAC for more air since I have a big engine.

After I made the changes I can turn the key and start the engine when hot with my feet on the floor. Just like a new car.

Re: Super Sniper install [Re: davenc] #2510783
06/20/18 01:08 PM
06/20/18 01:08 PM
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Aurora, Colorado
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Originally Posted By davenc
Andy,

Are you able to assess whether the Super Sniper on a dual plane is susceptible to more distribution issues than carb? There have been comments that TBI and DP are not a good match, I suspect based on at least that Engine Masters episode.


Not sure about the intake part, but I have noticed on the FiTech form where some people have had injectors that were not flowing the same. A few of the problems were related to debris plugging the injectors, and leaking injector "O"-rings.
After I plumb the fuel system, I connect the fuel supply line to the return line where they would normally connect to the fuel rail, and then run the EFI pump for a minute to make sure any debris in the lines is flushed back to the fuel tank. Last time I did this, I used one of the cheap Summit filters with the -6 AN connectors on each end and the small disc screen filter in it. This way i was able to inspect the screen filter to see if any junk was in the supply line (which there was a small piece of rubber hose.)
This is the filter I used to "loop" the supply and return lines.
I had the filter from my old carbed truck.

https://www.summitracing.com/parts/sum-230101/overview/

I would not use the filter above in EFI application, and there is not much filter area in the screen. This is a link to the replacement screen filter if you want to see what it looks like.

https://www.summitracing.com/parts/sum-230110

Re: Super Sniper install [Re: AndyF] #2510833
06/20/18 02:29 PM
06/20/18 02:29 PM
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Sonora CA
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NO TBI EFI system will like a dual plane manifold. Dual planes were designed to generate a "signal" for a carb. TBI EFI wants to inject into an open plenum. If you must use a dual plane manifold then cut the divider out and add at least a 1" open spacer.

Last edited by Mopar_Rich; 06/20/18 06:11 PM.
Re: Super Sniper install [Re: AndyF] #2510842
06/20/18 02:49 PM
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I'm running a Performer RPM with a one inch spacer at the moment. I'll most likely end up swapping intakes later this summer as a test just to see how she works with a single plane intake.

The engine runs like a beast with the Performer RPM but I don't have 8 02 sensors so I can't tell you if I'm having distribution problems or not. It will spin the tires as long as I stay in the gas and that is with 13 inch tires out back and a 50/50 weight distribution.

Re: Super Sniper install [Re: AndyF] #2510873
06/20/18 03:53 PM
06/20/18 03:53 PM
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nj
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Are
There any good resources out there for these tbi setups?
I have the ez efi on my duster and I'm not happy with it. I would like to think it can be improved. As it sits it doesn't work well with manual trans.

Re: Super Sniper install [Re: AndyF] #2510915
06/20/18 05:19 PM
06/20/18 05:19 PM
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The Sniper can be tuned with a laptop but some of the other TBI systems cannot. If you can't tune the system and it isn't working right then there isn't much you can do about it. With the Sniper you can plug in a laptop and fix the problem, or find a tuner who can help you.

Re: Super Sniper install [Re: AndyF] #2510927
06/20/18 05:48 PM
06/20/18 05:48 PM
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nj
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That's definitely a nice option

Re: Super Sniper install [Re: JAMESDART] #2510950
06/20/18 06:13 PM
06/20/18 06:13 PM
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Posts: 1,938
Sonora CA
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This is what I do!
fastmanefi.com

Re: Super Sniper install [Re: Mopar_Rich] #2510982
06/20/18 07:03 PM
06/20/18 07:03 PM
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It's Complicated
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Hey Rich, Any chance Holley dose a dual 02 sensor Sniper in the future. Like to see 02's for each collector. Or would it not be of any benefit with a TBI setup.

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