anyone running a aftermarket EFI system on a Olds 455. trying determine if there is any benefit for daily driver vs a carburetor.
EFI System upgrade
- Thread starter scarborough
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A lot have had issues with the FI Tech, Fleming442 has had multiple sensors and an injector fail on his 67 442. I talked to Mark as he was doing two Holley Sniper Olds builds. The Holley Sniper has an extremely slow and inaccurate wideband. Mark told a Holley rep at PRI about this issue. Their answer, what do you expect for $1000? You get what you pay for, unfortunately. I also would not do an inline pump, do an in tank pump, if you go this route. Good luck.
thanks for the feedback. I guest a $1000 isn't much if its not your money. i may have to reconsider it
If you have a properly tuned Q-jet, Edelbrick or Holley vacuum secondary carb, then there will not be any gains from fuel injection for daily driving.
There tons of people driving in FiTech and Holley snipers without issues. The Holley Term x TB is a more robust setup and more money as well.
Personally, I don’t a carb for anything that I want to do more with than cruise around with occasionally.
Most every TB fuel injection system installed is going to be close to $2k worth of parts.
There tons of people driving in FiTech and Holley snipers without issues. The Holley Term x TB is a more robust setup and more money as well.
Personally, I don’t a carb for anything that I want to do more with than cruise around with occasionally.
Most every TB fuel injection system installed is going to be close to $2k worth of parts.
Yes, there are plenty running around with these new EFI, plenty of issues as well. From tuning to multiple part failures with very little run time and issues that can't be resolved. The Terminator is supposed to be much better than the Sniper. Mark has data on how out to lunch the Sniper's wideband is and how slow it reacts. Too bad, I was considering one as well. I may go with something like the Terminator down the road.
I just finished an installation of Holley Terminator X Max Stealth 4150. The price of the sniper was apetizing at around 1000 bucks, but the big letdown was the fact that the injectors are non-serviceable. This and the capability of electronic transmission control in the same “box” was the reason I landed on Terminator X vs. stealth.
As others mentioned above, you probably won’t notice a performance gain at WOT between a properly tuned carb and EFI. But the big benefit here is you are in complete control of all engine parameters at any given time. The EFI will more than likely show you how bad of a carb tuner you are-and how off your distributor timing curve is. With EFI There is no guesswork, and once you understand carburetor fundamentals, you can easily transfer that knowledge to EFI. The ability to data lot hundreds of channels of data can be very powerful. There are other features such as idle timing control, AC kick, electric fan control, nitrous control etc that really make it worth it.
As others mentioned above, you probably won’t notice a performance gain at WOT between a properly tuned carb and EFI. But the big benefit here is you are in complete control of all engine parameters at any given time. The EFI will more than likely show you how bad of a carb tuner you are-and how off your distributor timing curve is. With EFI There is no guesswork, and once you understand carburetor fundamentals, you can easily transfer that knowledge to EFI. The ability to data lot hundreds of channels of data can be very powerful. There are other features such as idle timing control, AC kick, electric fan control, nitrous control etc that really make it worth it.
I installed a Holley Super Sniper (I wanted the extra inputs to monitor oil and fuel psi) on my car 2 years ago and I love it!
I have installed about a dozen of these systems on customers rides. The most radical was a 455 Pontiac, roller cam, aluminum heads 600+HP.
I have installed about a dozen of these systems on customers rides. The most radical was a 455 Pontiac, roller cam, aluminum heads 600+HP.
An overdrive transmission will offer more of an advantage for DDing than a carb to EFI swap. Heck GM probably spent more R&D on the original Qjet than the aftermarket companies spent on their EFI systems.
I've been around two Sniper installs and both worked as they were supposed to. It's good to see you post about your experience that is something other than internet warriors repeating others' bad experiences. I use the term 'bad' loosely because the majority of Holley issues are the result of the installer.
FB has really hurt Holley Sniper imo. And it's working on hurting TermX as well. I'm yet to hear of anyone being abandoned by Holley and getting the shaft. And there are many cases of Holley taking care of issues that were created by the end user for free. The biggest actual issue I've found is that Holley tech support developed very long wait times during the 1st 6-12 months of the pandemic due to lack of tech guys at work at Holley.
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