Sniper Fuel Economy - Team Camaro Tech
EFI in your modern Classic EFI conversions in early Camaros

 5Likes
  • 2 Post By rtchaney
  • 2 Post By bigblockragtop
  • 1 Post By socal_tom
 
LinkBack Thread Tools Display Modes
post #1 of 15 (permalink) Old Mar 31st, 18, 09:13 AM Thread Starter
Gold Lifetime Member
Robert
 
rtchaney's Avatar
 
Join Date: Jan 2007
Location: 85340
Posts: 317
Garage
Sniper Fuel Economy

Well, I know people have been asking about the fuel economy of carb vs EFI, difficult to relate though it may be, and I wanted to share my experiences.

The rear is an 8.2" w/ Yukon Posi 3.08. The tranny is a TKO-500 with the 3.27 1st gear. The engine is a BluePrint full Roller 383 430hp, coil in cap dist, Edelbrock dual plane EPS, with electric fans. For a carburetor, I was running a Edelbrock 1406 (it's a 1405 set to run leaner from the factory).

Before I moved out to AZ, I used to drive 80/20 highway/city and still have receipts showing 22.9-23.3 mpg per tank on the carb.
Driving from The West Valley in Phoenix, through Phoenix to 87 and then up through the mountains to Flagstaff with the AC on and two kids in the back, we averaged high 18's in the mpg. That includes the 5K ft elevation change and the city driving through Flagstaff.
Once I installed the Sniper system, choose stock cam in the set up Wizard regardless of what your cam is..., I drove it around and let it learn how to be happy. Once it was, I adjusted the Idle AFR to 14.0, The WOT AFT to 13.0 and the Cruise AFR to 15.0. She was happy and had no temp issues of lack of power in Lean Cruise, so I upped the AFR to 15.5. With those settings, I am averaging over 25 mpg. Pure Highway @ 65 is over 27mpg. For my next trick, I'm gonna try and lean her out some more and try to find a stock GM distributor that I can lock out and use the Sniper System to control the timing.

- Rob
Legacy 69 and ctcz28 like this.

1968, 5 speed, Vintage Air Gen IV, American Auto Wire Update Series, Champion 4 Core Rad, BMR front w/ Koni's, BP Roller 383, Posi 8.2", Solid Frame Bushings
rtchaney is offline  
Sponsored Links
Advertisement
 
post #2 of 15 (permalink) Old Mar 31st, 18, 02:06 PM
Gold Lifetime Member
Jonathon
 
Smitty68's Avatar
 
Join Date: Nov 2012
Location: Hartselle,AL
Posts: 1,310
Re: Sniper Fuel Economy

Pretty dang cool information Rob. I just installed one of these on my car and though my motor configuration isnít similar in cubic inches the info is somewhat applicable. Thanks for posting. I may hit you up in the near future to pick your brain on how to do this myself with my sniper.

68 Resto-Mod in progress..355sbc .350 Trans Rushforth wheels
My Build:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Smitty68 is offline  
post #3 of 15 (permalink) Old Mar 31st, 18, 04:20 PM
Senior Tech
Nick
 
Rarerat's Avatar
 
Join Date: Dec 2000
Location: New Mexico
Posts: 2,859
Re: Sniper Fuel Economy

Great info!
Rarerat is offline  
 
post #4 of 15 (permalink) Old Apr 4th, 18, 08:48 PM Thread Starter
Gold Lifetime Member
Robert
 
rtchaney's Avatar
 
Join Date: Jan 2007
Location: 85340
Posts: 317
Garage
Oops! 91 Octane weighs more than 87..... So, now I'm at 26 mpg at 65 at 15/1 afr. My bad....

1968, 5 speed, Vintage Air Gen IV, American Auto Wire Update Series, Champion 4 Core Rad, BMR front w/ Koni's, BP Roller 383, Posi 8.2", Solid Frame Bushings
rtchaney is offline  
post #5 of 15 (permalink) Old Apr 5th, 18, 01:37 PM
Senior Tech
mike
 
Join Date: Jan 2011
Location: east coast
Posts: 2,288
Re: Sniper Fuel Economy

Amazing and it's not even a LS engine.
ZZ_430 and rtchaney like this.
bigblockragtop is offline  
post #6 of 15 (permalink) Old Apr 5th, 18, 10:15 PM
Senior Tech
Tom Anderson
 
Join Date: Oct 2014
Location: Southern California
Posts: 531
Garage
Re: Sniper Fuel Economy

That's some really nice MPG Rob and I have been reading a lot about it. Please post more info as you do more test settings I am very interested. Thanx for posting what you did
rtchaney likes this.
socal_tom is offline  
post #7 of 15 (permalink) Old Apr 7th, 18, 02:13 PM Thread Starter
Gold Lifetime Member
Robert
 
rtchaney's Avatar
 
Join Date: Jan 2007
Location: 85340
Posts: 317
Garage
Well, she did not like the 16/1 cruise.... However, I believe it is because the parameters of Idle, Cruise and W.O.T. are not ideal for my car. It would seem that the closer I get to WOT, the richer the afr would get; and it does, but not until around 30% throttle!!!!! So, hear I am trying to accelerate for a pass on the highway at 65 mph in 5th at about 1650 rpm. 16/1 ain't gonna cut it. I suppose I may need to buy the $50 cable so I can adjust those parameters on my laptop. Sigh....

1968, 5 speed, Vintage Air Gen IV, American Auto Wire Update Series, Champion 4 Core Rad, BMR front w/ Koni's, BP Roller 383, Posi 8.2", Solid Frame Bushings
rtchaney is offline  
post #8 of 15 (permalink) Old Apr 7th, 18, 03:53 PM
Moderator
____
 
DOUG G's Avatar
 
Join Date: Mar 1999
Location: Maryland, USA
Posts: 19,569
Garage
Send a message via MSN to DOUG G
Re: Sniper Fuel Economy

Nice...my problem is keeping my foot out of it

Always blip the pedal on under passes, city streets, and such


I may go FI one day, buddy has a FITech I can try, but its the smaller one which might be too small for my motor

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
DOUG G is offline  
post #9 of 15 (permalink) Old Apr 7th, 18, 04:59 PM
Moderator
John
 
Vega$69's Avatar
 
Join Date: Sep 2010
Location: Vegas NV/Wesley Chapel FL
Posts: 13,054
Garage
Re: Sniper Fuel Economy

Not going to like 16- 1 afr on any motor and detonation will kill the motor let alone the mileage stick around 14.8 - 15.

Have you set it up to let the sniper control timing? Doing so will get you the best of both mileage and throttle response. You can use an adjustable MSD rotor.

2017 Corvette ZO6 with ZO7 Option
66 Chevelle Protour LS3/525(SOLD AT Mecum 2018)
69 SS396 Cortez Silver(SOLD)
69 Z28(Sold)
69 Pro Tour - LS3/T56
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
(SOLD)
69 Pro Tour - LS7/T56 (SOLD)
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

69 Z28/RS Tribute355/5 Speed (SOLD)
69 RS Clone 427/TH400 (SOLD)
67 RSZZ502/5 Speed (SOLD)
69 Camaro 406 SBC/TH400 (SOLD)
Vega$69 is offline  
post #10 of 15 (permalink) Old Apr 7th, 18, 07:00 PM
Gold Lifetime Member
Jonathon
 
Smitty68's Avatar
 
Join Date: Nov 2012
Location: Hartselle,AL
Posts: 1,310
Re: Sniper Fuel Economy

Quote:
Originally Posted by Vega$69 View Post
Not going to like 16- 1 afr on any motor and detonation will kill the motor let alone the mileage stick around 14.8 - 15.

Have you set it up to let the sniper control timing? Doing so will get you the best of both mileage and throttle response. You can use an adjustable MSD rotor.
Well said John. Yes a MSD/Holley dizzy will plug and play with your configuration.

68 Resto-Mod in progress..355sbc .350 Trans Rushforth wheels
My Build:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Smitty68 is offline  
post #11 of 15 (permalink) Old Apr 8th, 18, 10:12 AM Thread Starter
Gold Lifetime Member
Robert
 
rtchaney's Avatar
 
Join Date: Jan 2007
Location: 85340
Posts: 317
Garage
I have not a dual sync or msd; they're expensive!!! I'm searching for a stock gm that'll drop in with the Sniper.

1968, 5 speed, Vintage Air Gen IV, American Auto Wire Update Series, Champion 4 Core Rad, BMR front w/ Koni's, BP Roller 383, Posi 8.2", Solid Frame Bushings
rtchaney is offline  
post #12 of 15 (permalink) Old Apr 11th, 18, 09:16 PM
Senior Tech
Tom Anderson
 
Join Date: Oct 2014
Location: Southern California
Posts: 531
Garage
Re: Sniper Fuel Economy

how well does a efi self learn work with a manual tran
socal_tom is offline  
post #13 of 15 (permalink) Old Apr 12th, 18, 08:06 AM Thread Starter
Gold Lifetime Member
Robert
 
rtchaney's Avatar
 
Join Date: Jan 2007
Location: 85340
Posts: 317
Garage
Quote:
Originally Posted by socal_tom View Post
how well does a efi self learn work with a manual tran
Well in my experiences! The one important item would be to wire the Sniper EFI A/C ground to a relay triggered by the compressor. That way the EFI knows the added load is from the AC. It will then bump your idel up by 100 and trigger your E Fan if you have one. I really have no complaints about the system except the need for a $50 cable to download the MAP to my PC if I want to tweak certain perameters.

1968, 5 speed, Vintage Air Gen IV, American Auto Wire Update Series, Champion 4 Core Rad, BMR front w/ Koni's, BP Roller 383, Posi 8.2", Solid Frame Bushings
rtchaney is offline  
post #14 of 15 (permalink) Old Jan 25th, 20, 08:44 AM
Apprentice
 
Join Date: Jan 2020
Posts: 22
Garage
Re: Sniper Fuel Economy

Havenít really checked my mileage but I donít think itís even close to that. Mine is in a 69 Camaro with a mild camed 350/700R4, I better go through the wizard again
Elwaupo is offline  
post #15 of 15 (permalink) Old Jan 26th, 20, 12:05 AM
Gold Lifetime Member
Mike
 
Join Date: Apr 2002
Location: Walla Walla, WA
Posts: 4,310
Re: Sniper Fuel Economy

That's pretty phenomenal mileage from a 430HP SBC. Cam specs?

Mike - '68 Camaro - aftermarket or modern pretty much everything.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Mkelcy is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome