4.3 to 383 Blueprint Sniper EFI

[volfan72]

This is a thread created to share my experience with replacing my factory 4.3L V6 with a Blueprint 383 Sniper EFI. My motor is scheduled for delivery in 10 days. I’ve accumulated parts from the radiator to the transmission to complete this project. I’ll try to update this thread as the truck progresses.

 

[sweetk30]

hope you get better results from the sniper than i did . 500 miles of crap and 3 months of my life i wont get back .

i went edelbrock pro flo 4 and never looked back .

will keep a eye open on this thread sounds like a good bump in power is planned .

 

[Erik the Awful]

My Sniper hasn't been flawless, but it runs well enough that I could daily it.

No exhaust leaks, no vacuum leaks! If you aren't meticulous, it won't run right.

Also, learn to read the handheld and what the TPS, IAC, A/F ratio, etc. mean and how they work together. You can troubleshoot a lot of minor problems without needing a separate scan tool.

 

[LC2NLS6]

Hopefully the trans is a manual trans. Else you'll need a trans controller or tune the factory ECM as a trans controller. At that point I'd ditch the sniper and go to a more expensive Holley setup with a trans controller built in.

 

[Erik the Awful]

OP didn't state what year or what transmission. If it's a 700R4/4L60, you don't need a transmission controller.

 

[volfan72]

My truck has a manual transmission. Works begun. Installing Dakota Digital gauges also.

 

[Tim W]

My sniper has been pretty good. I had a bad TPS but thats about it. They say it self learns... well it learns about 80% then you tune or have it tuned the rest of the way.

 

[LC2NLS6]

I'm always tuning my base fueling to try to get it just right. I have my closed loop comp limits at 10%. When it's right you can just stomp the pedal and it doesn't have to try to correct as much for the weather.

 

[volfan72]

Cleaning up the wiring harness. Removed wires not needed.

 

[volfan72]

Everything has come together. The headers are temporary as the motor is breaking in and there’s a potential for ceramic to be damaged.