Which to buy Holley sniper or stealth

[1978 Z/28]

I am hoping some one can shed some light on the main difference the Holley sniper and stealth.
I know the sniper comes with a regulator. I am not interested in a EFI unit that looks like a carburettor.
I have an EFI fuel system with a return line, with regulator mounted on right front inner fender. I am going to install the high pressure spring set the fuel pressure to 58.5 psi. I have heard it is possible to run1 line to the sniper and plug the outlet.
thanks David

 

[krabben1]

Sniper is less than,Stealth I beleive you can do more with.
I have 2 snipers on both BBs.
You can only run a supply line on sniper,no return,if you use their intank retro pump and sender.I have that on my chevelle.

 

[CorkyE]

You might want to search Holley's efi forum for detailed answers. There are several differences, wiith the Stealth the ecu is more robust is stand alone. This really helps with RFI. The throttle body is larger at 950 cfm. What efi system do you currently have? I have the Edelbrock ProFlo 4 and it's worked well for me.
Here's a link where this was discussed on Chevelles.com https://www.chevelles.com/threads/holley-sniper-vs-stealth.1012817/

 

[1981paul]

There are two versions of the "ECU in the throttle body" 4150 Sniper. The "Stealth" looks like a carb, and is what I'm running on my race car. Aside from the looks, the differences are the Stealth requires an external fuel pressure regulator, and has one more issue that I'll outline below. That said I would NOT buy the "Stealth" unit for a street car.

The linkage between the primary and secondary throttle blades on both units is linear, so the secondaries open at the same time and the same amount as the primaries. This can make it a little harder to drive, especially if you have a manual.

Both units will accept a progressive throttle linkage that Holley sells, and both have the software option to run a progressive throttle, BUT

The injectors in the Stealth are in a different position than the regular unit. Instead of the two front injectors firing with the front throttle plates, and the rear two injectors firing with the rear, they are actually split left and right.



Overall I'm happy with the unit outside of this issue. It is lacking inputs, but for most street cars that won't be an issue.

As far as your fuel question, I don't have a good answer. I run a return on mine into a Holley Hydramat in the fuel cell.

 

[2ndGen77]

This is the set up I have in my 77 Camaro with the in-tank pump and no return line. I also use Hyperspark to control the timing. I've set up Sniper on 3 cars in the past few years. I have nothing against carburetors, but I will prob never go back to one. Installing sniper has been the best decision I've made on my hot rods! Hyperspark just makes it that much better. Huge fan here.

Be forewarned: Since the ECU is on the front of your Sniper unit, EMI issues can drive you nuts. ESPECIALLY if you are using original wiring. I have experienced almost all of the EMI issues you can imagine. If you go with a sniper and experience this, hit me up. I can maybe help! Lots of ways to combat it. Good luck!!

Sniper is less than,Stealth I beleive you can do more with.
I have 2 snipers on both BBs.
You can only run a supply line on sniper,no return,if you use their intank retro pump and sender.I have that on my chevel

 

[Brad Burris]

I put the Terminator X MAX on mine 1980 Z and I love it. I took out the 2004r transmission and put in a heavily built 4l60e. I had a double pumper carburetor built by Pro Systems and it worked great. But I wanted the injection. Oh and I had it professionally tuned by a certified tuner.

 

[JasonZE]

have the snipe rinjectors gotten any quieter? we installed on on a mates 408 and its noisey from inside the car (at first we though the lifters were bad but was not rpm based clicking as it was from the injectors)

 

[AEGIS43]

There are two versions of the "ECU in the throttle body" 4150 Sniper. The "Stealth" looks like a carb, and is what I'm running on my race car. Aside from the looks, the differences are the Stealth requires an external fuel pressure regulator, and has one more issue that I'll outline below. That said I would NOT buy the "Stealth" unit for a street car.

The linkage between the primary and secondary throttle blades on both units is linear, so the secondaries open at the same time and the same amount as the primaries. This can make it a little harder to drive, especially if you have a manual.

Both units will accept a progressive throttle linkage that Holley sells, and both have the software option to run a progressive throttle, BUT

The injectors in the Stealth are in a different position than the regular unit. Instead of the two front injectors firing with the front throttle plates, and the rear two injectors firing with the rear, they are actually split left and right.



Overall I'm happy with the unit outside of this issue. It is lacking inputs, but for most street cars that won't be an issue.

As far as your fuel question, I don't have a good answer. I run a return on mine into a Holley Hydramat in the fuel cell.

I apologize for my confusion, but is the reason you wouldn't buy a Stealth for the street because of that weird issue of the front and rear injectors firing on one side of the unit, split left and right? I agree that seems incredibly strange that it does that.

Believe it or not, about 2 years ago I was talking to a guy with a sweet '57 Chevy w/383 stroker (very similar to my engine) who said he first installed a Sniper and it never ran right so he switched to a Stealth and he loved it. This was on the street, well parking lot, in front of a Circle K gas/mini mart.

 

[1978 Z/28]

Here is a picture of my fuel system. I have a Tanks Inc fuel tank and GPA-4 fuel pump. I am using a bypass regulator that came with 2 springs one in for caburators and the other is for EFI. If I change the springs can I run the single fuel line to the sniper and plug off the outlet from the sniper regulator

 

[1981paul]

I apologize for my confusion, but is the reason you wouldn't buy a Stealth for the street because of that weird issue of the front and rear injectors firing on one side of the unit, split left and right? I agree that seems incredibly strange that it does that.

Believe it or not, about 2 years ago I was talking to a guy with a sweet '57 Chevy w/383 stroker (very similar to my engine) who said he first installed a Sniper and it never ran right so he switched to a Stealth and he loved it. This was on the street, well parking lot, in front of a Circle K gas/mini mart.

No worries. I may not have been clear. The progressive linkage makes the car, especially if it’s a manual, much much easier to drive. The 1:1 linkage can be a bit too sensitive leaving from a stop.