Holley Sniper Conversions.

[Ohio Tom]

[Paul.H]

[Alstrup]

Not sure where I fit in either
Like I have said several times now, these systems, - like the above, is STILL only an "electronic carb" basicly like the ones used in the early 90 to about 2000 in production vehicles, but with a significantly better software (Semi programmable) In siuch set ups like the above, I am sure it can work allright, - to well, AS LONG as you are using it in fair weather. Try driving it on a frosty morning and you will soon experience what I say and have said.

I wish I had more time, energy and money. Then I would take a month off and finish my self teaching port injected plug & play system that will work in any weather and support up to about 95 or 130 hp, dependant on version, still with only one TB.
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https://www.thesamba.com/vw/forum/viewtopic.php?t=435993

[Paul.H]

Had a quick look on farcebook at the Sniper groups and the first thing I saw was a barrel filling up with fuel above the butterfly due to a failed injector and then a guy with a nice 71 Challenger stating he was getting 9mpg with a carb and only 6mpg with the Sniper
I get a feeling that this whole thing is made in China using $3 injectors and other cheap components and then they let the customer do the quality control

[Paul.H]

[Chadabear]

[NJ John]

I have a food truck friend that has a converted snap-on topkick food truck. It has a 454 and he was getting 6mpg and switching to a sniper system. I can wait to hear the results. Just haven’t worked along side him since. Keep in mind, he apparently had some carb issues before the conversion. And this truck is huge!
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1973 standard, yellow, lowered, 3” narrowed front, 1600 blo-thru turbo w/single dell 15.4@86, so far
11.41 et buggy. Long gone
Let’s go O’s! Let’s go O’s!
https://www.youtube.com/@AirSpooledGarage

[madmike]

Well I must of done something right,,, free carb, about $300 for the intake
28 mpg and goes fast too
680 Vacuum secondary Quick fuel Holley Draw threw turbo
Heated intake from Ron Lummus
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'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works"

[Paul.H]

[madmike]

Well Bite me Paul , I'm gonna go buy a Lotto ticket ,,cuz this set up worked on the 2074 cc plus the 2276cc & 2180cc
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'Black Ice'Drag Buggy 'Turbo'
Rail Buggy 1915 turbo
76 Drag/Street bug 2180cc 'Turbo' 11:85 @113 mph"If I go any faster I'll burn up the Hamster" ,gets 28 mpg. also 10/09/22 11.90 @115 mph
"If I'm ever on Life Support,UNPLUG Me, Then Plug me back In see if that Works"

[BFB]

I was just looking on holley's website the other day for fuel pumps and got to looking at the sniper efi, which I do think would be more accurately termed tbi. but I gotta say that for the price it does seem to offer a lot especially for someone who may not be ready to jump straight into full efi.
I thought it was cool that it has both a simple tuning display pad and the capability to tune more in depth with your laptop. and also has timing map as well...
I still have to do more research but they have a setup that's supposed to be a jeep carb replacement, and a lot of the jeeps used to run weber 32/36 or 38/38 carbs. so if this sniper is meant to replace those on jeeps they'd be a direct bolt on for the single center mount vw intake too.
I dunno, I'm kicking it around for my Baja. I'd drive it daily but it's cold natured at first and I'm getting old enough I don't feel like dickin with it early in the morning, it's easier to jump in my truck and go on down the road. but I'm thinking if the sniper can adjust for air temps so it starts and idles better until the engine reaches operating temp and still perform as well as the carb , I'd be tickled pink.
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Forced induction can overcome a lot of obsticles that gets in it's way
"You are the Engineer and the Mechanic.  
Build it your way not the way someone else does it. Their way might not work for you." - clonebug
An interesting thing happens in forums where everyone starts parroting the same thing and "common knowledge" takes over.
“ The monkey see monkey do mentality seems to run deep in VW people. "Gene Berg said it was so 30 years ago so thats the way it is" “ - bdkw1

[Chadabear]

[W1K1]

[BFB]

[panel]

[clonebug]

Megasquirt has the ability to run an extended CLT temperature limit.

I would hazard a guess that any decent ECU would have the ability to set your own warm up enrichment and cold start enrichment.
MS2 has at least three tabs for starting and warmup. You can set whatever temperature you want to end the enrichment based on CLT and/or time based by engine cycles and more.
You can also adjust timing and enrichment if it gets over whatever temp you feel is too warm.
It's up to the driver to decide how long the engine needs enrichment depending on what his state of tune is in. It's all about drivability.

Oil temp enrichment adjustments are too slow on an aircooled engine and it is better to take a reading off the cooling tin bolt on top of the head.
That position is not for reading head temp but only for referencing warm up and cold start.....at which it works really good there.


That is not to say you can't monitor head temp trends using that sensor since you can log whenever you want and can go back and watch the trends at idle, cruise and full throttle pulls to see what is a normal range.
You can also see trends on what AFR and timing have as an effect on CLT by logging with different settings.
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[Paul.H]

Most thermistor temp sensors are maxed at 150deg C so can't be used for overheat protection so other than warm up they ain't much use and most likely the Holley is supplied with a large 3/8 NPT sensor which could be screwed into the rocker box area

[Lingwendil]

[Erik G]

for what its worth the holley coolant temp sensor that's included sucks. it isn't accurate say at 100 degrees. a few pages back I put up some alternitive part #'s - the Standard Motor Products TX3 sensor is a direct better replacement

richardcraineum - see this sniper set up ready for vw motors https://www.red-emotorsports.com/holley-sniper-efi-for-your-vw

[Alstrup]