EFI For 68 383 Road Runner

[andyf]

Here is the intake off my low deck 512. This started off as a Trick Flow intake then was fully ported by Wilson and then converted to EFI by Wilson. I probably have $2000 invested in the intake alone so it isn't exactly a cheap process.

 

[furious70]

What's the main driver for moving to efi?
My main driver was turbo charging the engine. I personally wouldn't mess with one that doesn't control timing.
I did mine in 2009 with a classic FAST system, there were no tpi at that time that could do what I wanted. The current ones are pretty impressive.

 

[skingjack]

Curious, for those who are running a sniper on a pre70 b-body, are you running a vented or a non- vented gas cap? Trying to determine if that might have something to do with fuel occasionally coming out the overfill/ rollover protection valve on my tanks Inc equipped RR ( when filling up). FYI, my 499” low deck had been running flawlessly in the week since installation until changing the exhaust Friday. Throttle response is phenomenal.

 

[JustCurious]

FWIW, I have also been leaning towards the holly sniper once I get the 512 stroker built.

 

[rolling_Thunder]

If this is your first EFI rodeo you might want to just start with a Holley Sniper to get your feet wet.

NOOOOOO! You gotta decide to run a Megasquirt (unassembled kit) so you can pull your hair out and build it, make a wiring harness from scratch, get it all wired in, tune it... just get an off the shelf intake and spend sleepless nights researching what works.... then go buy a TIG welder and learn so you can weld in your injector bungs... then....

I hope the sarcasm is caught... I know a guy who did that.... not naming names...

 

[Bad B-rad]

ANDYF that intake is a work of art!!!

I also have a 383, I am currently rocking stock 4bbl, and do not have the money to do SMPI,
so as far as throttle body injection kits go, is the Holley sniper, the better set up the FI Tech?

 

[andyf]

Yes, the Holley Sniper setup is much better than the FiTech or the MSD Atomic or the Edelbrock stuff. The Holley Sniper still has some issues but it is much better than anything else on the market these days. I do a fair number of Sniper installs for local guys and most of them work really well right out of the box. Sometimes a unit is bad and goes back for warranty but Summit and Holley are both pretty fair in terms of replacing parts.

You have to read the instructions and follow them though. Lots of guys think they are EFI experts since they know how to change the jets on a carb and they screw up the Sniper install. Installing a Sniper requires some electrical experience as well as some computer experience. It isn't a good fit for someone who doesn't know how to find a file folder on a hard drive or download a file from website or open a zipped file. The Holley forum is full of questions from people who don't know how to transfer a file from one computer to another. Those folks really struggle to get their Sniper up and running.

 

[HawkRod]

Yes, the Holley Sniper setup is much better than the FiTech or the MSD Atomic or the Edelbrock stuff. The Holley Sniper still has some issues but it is much better than anything else on the market these days. I do a fair number of Sniper installs for local guys and most of them work really well right out of the box. Sometimes a unit is bad and goes back for warranty but Summit and Holley are both pretty fair in terms of replacing parts.

You have to read the instructions and follow them though. Lots of guys think they are EFI experts since they know how to change the jets on a carb and they screw up the Sniper install. Installing a Sniper requires some electrical experience as well as some computer experience. It isn't a good fit for someone who doesn't know how to find a file folder on a hard drive or download a file from website or open a zipped file. The Holley forum is full of questions from people who don't know how to transfer a file from one computer to another. Those folks really struggle to get their Sniper up and running.

I think this is excellent advice as far as the install (I can't comment on Holley Sniper vs. other FI systems though - I have experience with FAST).
To strengthen what andyf stated, fuel injection is a detailed system, and you really need all components to be well thought out and installed. I know people have done it differently, but I feel an in tank fuel pump is important, as is a return line. The plumbing has to be right and well thought out. Likewise, as andyf mentioned, the FI wiring must be understood and nicely integrated into the car.

My FAST system has been on my car since 2015. I drove it across country at all kinds of altitudes, temperatures and speeds and it never missed a beat in all the years I have had it. However, the installation was detailed and I had issues getting it running. In my case, I had a bad ECU that FAST tech support gave me the run around about, but once a proper unit was installed the system has been flawless.

Hawk

 

[Bad B-rad]

I do a fair share of tweaking to the gen3 hemi cars, and although I don't write the tunes, I do data logging, and set up and install of the custom tunes, in addtion to regular mechanical parts install.
I was thinking the throttle body injection set up would be similar, once installed.