Granted its a different fuel type, but I happen to own a VW passat TDI. It will get an honest 52-55MPG on the freeway coupled with a DSG transmission. Good luck getting that with an old mechanical fuel injection. Id say that's disproving your "EFI/technology has a lot of catching up to do". I would also agree with another previous post that the key benefit to EFI in a boat isn't fuel efficiency. A carburetor will not compete with fuel injection regarding fuel distribution, cold starting, tune ability... (MPFI systems). I guess this one of many benefits over a carb isn't relevant or important to you guys?! Carburetors can "work" in a marine application, just fine, however things can always improve, and this is where the newer self tuning EFI systems come into play.

Guess I should ditch my EST distributor for a points unit, a double pumper holley with blower technology from WWII..... We all have different approaches to said goals. To me there is plenty of great technology in 2014. This is the greatest time in history for raw Performace. Many things contributed to this, EFI being an essential ingredient.

Electronic sequential port injection is not 2014 technology. It's been around a long long time. What is 2014 technology is the average guy who owns a Stanley socket set can bolt it on and have it work beautifully. The technology that got us to that point Is truly awesome . Would I want a carb on any of my daily drivers nowadays, no way. My boat however, serves me one purpose, which is solely fun. If my pocket book would allow me to convert my twin roots blown engines to full efi, I'd do it in a second. But then again, if my pocket book had some extra padding, I'd be buying Whipples to replace my dinosaur roots blowers.

Imo , there are better ways to upgrade the flat tappet 1960s cylinder headed .77hp per ci 502 than simply bolting an efi setup on it. I'd rather invest in better cylinder heads, exhaust, cam , etc. If money isn't a concern, the do all the above and efi and now you have a great package!!

When did I state MPFI was 2014 technology? Oh yeah I did NOT! However self learning and tunable EFI specifically Holley HP is. It was created not too long ago as you know. It is changing the old mentality that tunable EFI is reserved for the elite tuner guys. The evolution has been in the works for several years, however Holley has perfected it with their new architecture.

I think we are in agreement on this. EFI isn't right for everyone, especially when other things can be purchased within a said budget. And regarding twins this is very apparent and a reality for most.

Tuneable efi is old technology also. Weve been tuning efi with laptops for 15 yrs. maybe the Holley stuff you bought is a new product but the technology is old now

I think you might be misunderstanding what I'm trying to say. Holleys newer(couple years now) HP EFI architecture which is self learning and also controls timing, is very evolved technology compared to the tunable EFI we are all use to. It is also user adjustable just as the older technology, however it's self learning algorithms are leaps and bounds beyond anything offered before, giving the non tuner, or newbie, an easy transition into aftermarket EFI, as it tunes off of engine input at a highly refined level. All this while still being able to tune the old fashioned way. So in short, EFI in this newer form is accessible to everyone. This is all outlined in Alex Haxbys "EFI for everyone". Really a very good read even if you are more than happy with your carburetors.

I'm limited by stock exhaust due to the type of boating I do( mostly family and mostly on a small lake) I only have a wellcraft bow rider so I live vicariously through you guys to get my offshore fix lol. The motor was built by a local marina that has a reman program and is "apparently" putting out 425 hp due to a better cam carb and held work . The cam is supposed be as aggressive as possible without needing to add headers. I was under the impression that this particular efi swap would increase hp, economy and driveabilty. I havea question about carb tuning. Can it only really be done on a dyno? As always thanks for the info

No. It can be done in the water. For best tuning if anything efi or carb you should have an o2 sensor. Then you can tune for perfect afr's. not sure it's possible for o2 on stock exhaust. They can be done real close without especially since your not running a power adder. You use a vacuum gauge to make sure you have the right power valve. As far as optimum jetting and fine tuning goes that'll have to be explained in better detail by Joe. (Mild thunder) he knows carbs very well

thx

I have to agree that this is a great time in history for raw performance but efi being an essential ingredient... No absolutely not its all about cylinder heads. Today we have an abundance of heads that we didnt have 20 years ago. It's been proven time and time again that efi will not make the power that a carb will. There are limits to carbs and then fuel injection is needed cause you can't get enough fuel through a carb. And even then it's not electronic injection being used. Fuel can be distributed very well with a carb (ever see split dominators?) do you really understand how fuel distribution works in an efi intake? If you don't have 8 egt sensors then what is the difference?

You crack me up. I guess 8 injectors don't precisely meter fuel like your grandiose carburetor!? And carbs absolutely do not always make more power than EFI. You make blanket statements that are plain false. It's guys like yourself that "scare" guys away from EFI in any form. My engine will be tuned with 8 EGT's, so yes mr condescending, I do "realize" what that's all about. How many guys use Dominator carbs? I would bet no even half of the Performace marine crowd does. Actually DP Holleys win that hands down. A dominator will not deliver fuel more evenly/precisely than MPFI. Thanks for the good chuckle though....

The OP doesn't need your scare tactics. He's already in touch with the right people who actually know about EFI.