Previous Thread
Next Thread
Print Thread
New 4150 style Sniper EFI #2719626
11/27/19 12:29 AM
11/27/19 12:29 AM
Joined: Jan 2003
Posts: 26,483
Oregon
A
AndyF Offline OP
Too Many Posts
AndyF  Offline OP
Too Many Posts
A

Joined: Jan 2003
Posts: 26,483
Oregon
Got the new 4150 style Holley Sniper EFI setup today. Looks pretty good. It has a standard throttle linkage and dual fuel inlet so it should fit a lot of applications without mods.

DSC_4037 (Large).JPG
Re: New 4150 style Sniper EFI [Re: AndyF] #2719650
11/27/19 06:49 AM
11/27/19 06:49 AM
Joined: Dec 2018
Posts: 10
Northern Bavaria / Germany
MichaelF Offline
member
MichaelF  Offline
member

Joined: Dec 2018
Posts: 10
Northern Bavaria / Germany
cool, i like the radiused entry better than the design before. They even put in the float adjusting screws....looks nice. Anything else different to the existing sniper 650?

Michael

Re: New 4150 style Sniper EFI [Re: MichaelF] #2719653
11/27/19 07:44 AM
11/27/19 07:44 AM
Joined: Jan 2003
Posts: 6,503
Tulsa OK
Bad340fish Offline
master
Bad340fish  Offline
master

Joined: Jan 2003
Posts: 6,503
Tulsa OK
How does the "carb style" effect the cost? IMO this is the way they should have come to market with the sniper. It looks really good which is hurdle that lots of people couldn't overcome about the throttle body systems.

Last edited by Bad340fish; 11/27/19 09:27 AM.

68 Barracuda Formula S 340
Re: New 4150 style Sniper EFI [Re: AndyF] #2719664
11/27/19 08:37 AM
11/27/19 08:37 AM
Joined: Jan 2003
Posts: 15,326
Val-haul-ass... eventually
B
BradH Offline
I almost got away with it!
BradH  Offline
I almost got away with it!
B

Joined: Jan 2003
Posts: 15,326
Val-haul-ass... eventually
HP capabilities?

Re: New 4150 style Sniper EFI [Re: Bad340fish] #2719676
11/27/19 09:25 AM
11/27/19 09:25 AM
Joined: Sep 2007
Posts: 1,718
Spahn Ranch
RMCHRGR Offline
top fuel
RMCHRGR  Offline
top fuel

Joined: Sep 2007
Posts: 1,718
Spahn Ranch
Originally Posted by Bad340fish
IMO this is the way they should have to market with the sniper. It looks really good which is hurdle that lots of people couldn't overcome about the throttle body systems.


Agreed! I would have preferred mine to look like a 4150 instead of a weird, anodized Thermoquad pancake looking thing! rant


'68 Coronet
'71 Duster
'76 D100
'17 Ram 1500
Re: New 4150 style Sniper EFI [Re: BradH] #2719732
11/27/19 12:28 PM
11/27/19 12:28 PM
Joined: Jan 2003
Posts: 15,326
Val-haul-ass... eventually
B
BradH Offline
I almost got away with it!
BradH  Offline
I almost got away with it!
B

Joined: Jan 2003
Posts: 15,326
Val-haul-ass... eventually
Originally Posted by BradH
HP capabilities?

Holley says 870 CFM; 650 HP NA with 4 100# injectors.

It would be interesting if they come out with a bigger 4150 Stealth model. I like this style better than the original Sniper design, although I don't know if they're functionally equivalent.

Is that a 1-to-1 linkage, or progressive?

Last edited by BradH; 11/27/19 12:29 PM.
Re: New 4150 style Sniper EFI [Re: BradH] #2719734
11/27/19 12:32 PM
11/27/19 12:32 PM
Joined: Jan 2003
Posts: 26,483
Oregon
A
AndyF Offline OP
Too Many Posts
AndyF  Offline OP
Too Many Posts
A

Joined: Jan 2003
Posts: 26,483
Oregon
I would expect that they'll release a version with the 120 lb/hr injectors which is what you would need for your engine. I don't have any inside info but it just makes sense for them to do that. The linkage is 1:1 out of the box. It can be changed over to progressive but then the unit has to be reprogrammed. I run mine in 1:1 mode. I tried progressive but decided to go back to 1:1 linkage.

Re: New 4150 style Sniper EFI [Re: AndyF] #2719782
11/27/19 02:40 PM
11/27/19 02:40 PM
Joined: Oct 2003
Posts: 10,174
W. Kentucky
justinp61 Offline
I Live Here
justinp61  Offline
I Live Here

Joined: Oct 2003
Posts: 10,174
W. Kentucky
Do most of these bolt on FI units still have issues with large cams that produce low vacuum?

Re: New 4150 style Sniper EFI [Re: justinp61] #2719785
11/27/19 02:47 PM
11/27/19 02:47 PM
Joined: Jan 2003
Posts: 26,483
Oregon
A
AndyF Offline OP
Too Many Posts
AndyF  Offline OP
Too Many Posts
A

Joined: Jan 2003
Posts: 26,483
Oregon
Originally Posted by justinp61
Do most of these bolt on FI units still have issues with large cams that produce low vacuum?


Just depends on how low the vacuum is. If vacuum at idle is really low then you have to run open loop at idle and go closed loop at 1500 or 2000 rpm. The Sniper doesn't have any problem handling race cams or even open headers but you have to adjust the tune. The out of the box tune won't work. If you know what you're doing it only takes a few minutes to dial in the tune. If you don't know what you're doing then it could take much longer.

Re: New 4150 style Sniper EFI [Re: AndyF] #2719828
11/27/19 05:02 PM
11/27/19 05:02 PM
Joined: Jan 2003
Posts: 15,326
Val-haul-ass... eventually
B
BradH Offline
I almost got away with it!
BradH  Offline
I almost got away with it!
B

Joined: Jan 2003
Posts: 15,326
Val-haul-ass... eventually
Originally Posted by AndyF
I would expect that they'll release a version with the 120 lb/hr injectors which is what you would need for your engine. I don't have any inside info but it just makes sense for them to do that. The linkage is 1:1 out of the box. It can be changed over to progressive but then the unit has to be reprogrammed. I run mine in 1:1 mode. I tried progressive but decided to go back to 1:1 linkage.

I'm trying to imagine driving on the street, staging, and launching off a foot-brake using a 1-to-1 linkage...

Re: New 4150 style Sniper EFI [Re: AndyF] #2719839
11/27/19 05:47 PM
11/27/19 05:47 PM
Joined: Oct 2003
Posts: 10,174
W. Kentucky
justinp61 Offline
I Live Here
justinp61  Offline
I Live Here

Joined: Oct 2003
Posts: 10,174
W. Kentucky
Originally Posted by AndyF
Originally Posted by justinp61
Do most of these bolt on FI units still have issues with large cams that produce low vacuum?


Just depends on how low the vacuum is. If vacuum at idle is really low then you have to run open loop at idle and go closed loop at 1500 or 2000 rpm. The Sniper doesn't have any problem handling race cams or even open headers but you have to adjust the tune. The out of the box tune won't work. If you know what you're doing it only takes a few minutes to dial in the tune. If you don't know what you're doing then it could take much longer.


I'd be in the second category. LOL

Re: New 4150 style Sniper EFI [Re: BradH] #2719842
11/27/19 06:01 PM
11/27/19 06:01 PM
Joined: Sep 2014
Posts: 2,919
Washington
M
madscientist Offline
master
madscientist  Offline
master
M

Joined: Sep 2014
Posts: 2,919
Washington
Originally Posted by BradH
Originally Posted by AndyF
I would expect that they'll release a version with the 120 lb/hr injectors which is what you would need for your engine. I don't have any inside info but it just makes sense for them to do that. The linkage is 1:1 out of the box. It can be changed over to progressive but then the unit has to be reprogrammed. I run mine in 1:1 mode. I tried progressive but decided to go back to 1:1 linkage.

I'm trying to imagine driving on the street, staging, and launching off a foot-brake using a 1-to-1 linkage...



I used to convert all my carbs to 1:1 linkage. The one I'm using now isn't, but it's just a linkage adjustment.

And soon, it will be 1:1 as well, I just need to do some other stuff first.


Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
Re: New 4150 style Sniper EFI [Re: madscientist] #2720761
12/01/19 07:01 PM
12/01/19 07:01 PM
Joined: Jul 2003
Posts: 4,072
The Wet Coast, Canada
megajoltman Offline
master
megajoltman  Offline
master

Joined: Jul 2003
Posts: 4,072
The Wet Coast, Canada
They now have HOLLEY SUPER SNIPER STEALTH 4150 - 1250HP one on there site. up


1969 Dart 383/727/D60

CTD Ram 4x4 Mega Cab

Procharged 350Z
Re: New 4150 style Sniper EFI [Re: BradH] #2720773
12/01/19 07:45 PM
12/01/19 07:45 PM
Joined: Jan 2003
Posts: 12,680
So. Burlington, Vt.
F
fast68plymouth Offline
I Live Here
fast68plymouth  Offline
I Live Here
F

Joined: Jan 2003
Posts: 12,680
So. Burlington, Vt.
Originally Posted by BradH
Originally Posted by AndyF
I would expect that they'll release a version with the 120 lb/hr injectors which is what you would need for your engine. I don't have any inside info but it just makes sense for them to do that. The linkage is 1:1 out of the box. It can be changed over to progressive but then the unit has to be reprogrammed. I run mine in 1:1 mode. I tried progressive but decided to go back to 1:1 linkage.

I'm trying to imagine driving on the street, staging, and launching off a foot-brake using a 1-to-1 linkage...


I recently programmed a tune for my friends Charger with the non-stealth style of Sniper on a 446 with a 6 speed.

The one-to-one linkage was a non-issue driving the car around in traffic with his combo.


68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
Re: New 4150 style Sniper EFI [Re: megajoltman] #2720784
12/01/19 08:35 PM
12/01/19 08:35 PM
Joined: Jan 2003
Posts: 15,326
Val-haul-ass... eventually
B
BradH Offline
I almost got away with it!
BradH  Offline
I almost got away with it!
B

Joined: Jan 2003
Posts: 15,326
Val-haul-ass... eventually
Originally Posted by megajoltman
They now have HOLLEY SUPER SNIPER STEALTH 4150 - 1250HP one on there site. up

Not for naturally aspirated; that's still limited to a claimed 650 HP. Probably sometime, though.

Re: New 4150 style Sniper EFI [Re: BradH] #2720794
12/01/19 09:23 PM
12/01/19 09:23 PM
Joined: Aug 2011
Posts: 1,753
KATY TEXAS
csk Offline
top fuel
csk  Offline
top fuel

Joined: Aug 2011
Posts: 1,753
KATY TEXAS
This is NA 4150 800 hp

Screenshot (35).png

LINK TO MY STORY http://www.onallcylinders.com/2015/...s-to-build-brilliant-1968-dodge-charger/
1968 Charger COLD A/C Hilborn EFI
512ci 9.7, Stealth heads, 3.54gear A518 OD 4050lb,11.09@123.4 full street car trim.
Re: New 4150 style Sniper EFI [Re: fast68plymouth] #2720802
12/01/19 09:56 PM
12/01/19 09:56 PM
Joined: Jan 2003
Posts: 26,483
Oregon
A
AndyF Offline OP
Too Many Posts
AndyF  Offline OP
Too Many Posts
A

Joined: Jan 2003
Posts: 26,483
Oregon
Yeah the 1:1 ratio setup works fine in my car too. Maybe a tiny bit too sensitive right off idle but that is it. Holley does sell a longer throttle arm which slows down the speed of the throttle opening so that can be tried. I like the 1:1 setup in terms of how the mixture gets pointed into the intake. I've had trouble with the progressive linkage on a Sniper with the mixture being pushed to the front of the intake at part throttle.

I do not have any experience with the 1:1 linkage and a two step. I'm sure people are doing it but I haven't talked to anyone who runs that setup.


Advertisement
Sponsored Link
Moparts Newest Topics
Gain 13-Plus-Rear Wheel Horsepower With Hughes Engines
by Rustymuscle. 01/23/20 01:48 AM
O/T three phase motor amperage question
by Hemi_Joel. 01/23/20 01:28 AM
brake line clip & retainer locations
by buzz440. 01/23/20 12:27 AM
69 Roadrunner Interior Panel Fitment Issue
by BigDaddy440. 01/22/20 10:12 PM
Moparts Recent Posts
Gain 13-Plus-Rear Wheel Horsepower With Hughes Engines
by Rustymuscle. 01/23/20 01:48 AM
O/T three phase motor amperage question
by Hemi_Joel. 01/23/20 01:28 AM
Aluminum 8 3/4 center section P4876445
by Doc Fiberglass. 01/23/20 01:10 AM
Wow, '18 WB Hellcat with 101k miles
by Doc Fiberglass. 01/23/20 01:04 AM




Powered by UBB.threads™ PHP Forum Software 7.7.1