I did that test last year. EFI made more power on race gas, power was down a little bit with Q16 due to injector location.

Actual track runs would be extra nice and a way better comparison.

Leonard Long made the switch on his car two years ago. He is a very smart guy with an endless budget having some of the best in the business working on his stuff. He saw ZERO hp with the engine and the car slowed down. In 2016 he struggled with the combo but in 2017 it came around for him and he as able to win the NA10.5 championship again. He had a lot of help from some friends of his in the Rotary engine wars. They think outside the box and basically told him and his engine builder and dyno guys that you have to put an injector where the engine is telling you it wants it. IF that means on the inside of a given runner half way up the runner than that's where one goes. I am not sure of his total configuration now but last year when we were talking to him and his guys there were 22 injectors on his engine. Sheet metal intake with 8 injectors up top.

FWIW he has been 7.80's with his SB Ferd in NA10.5. He is always trying new stuff. Last year mid season was a lenco drive and converter with his G Force trans, Leonard is the owner of G Force fyi. This year not sure what he has going on but he tackled this EFI deal at the end of 2015 and is now back to where he was at the end of that year. I can tell you all of us involved in NA 10.5 are watching, but so far he is the only one to take the leap. We have heard the stories and seen first hand how it works. It almost cost him the Championship in 2017 when they struggled with electrical gremlins in Norwalk..

Guess what I'm saying is this guy has the best people involved in his program, Vizner builds his engines and the Bartons have helped with the EFI set up. Money is no object for Leonard and he struggled a fair amount with it. We have some fast cars in the class for sure and we are all watching.

What about mechanical injection like a Ron's Toilet bowl?

Both fully sorted out systems, the carb makes a hair more peak power.
Now EFI has infinite adjustability, mid range, cold starts, MPG, Not washing out cylinders on start up, ect.
Carbs are simple to install.
EFI requires much more.
Matt

The system that I'm putting on my Duster is top of the line Holley stuff. I'm not sure what the total cost is, maybe around $5000. But you don't need a distributor, crank trigger, carb, ignition box, coil, racepak, gauges, etc. So if you are starting from scratch it is about a wash.

Plus it is a cleaner install. Getting rid of all of the gauges, and misc ignition stuff like start retard, two step, high speed retard, etc. is a benefit to me.

What about mechanical injection like a Ron's Toilet bowl?

I can build, test and sell a Dommy that can and DID win Drag Week and get 15+ mpg's for $1,200..............

Id bet on the carb

Of course NASCAR has to worry about fuel miledge as well and there is just no way a carb can match it, you can't cut fuel on a carb when coasting, braking, lean it out a little to try and make one last lap on your fuel...

So many experts chiming in on EFI... I tune both and slightly more carbs on the dyno.

Carb changes are usually absolute. Simple One change, one result. Won't be entirely perfect everywhere but you can make them pretty damn close.

EFI will only be superior when you have a good tuner and granted they know what they are doing.

A half ass self learned EFI system vs a perfectly tuned carb. Wonder which will be better?

Maybe the better way to argue this one is- Well mechanical fuel injection is better. All the top fuel cars run it and they are the fastest!!!....

There was way more to the pro stock change than just EFI.

Well I quoted REAL WORLD dyno and on track info from a class that is NOT pro stock and is very cutting edge. I know most don't care but guys running NA10.5 are on the cutting edge of engine development. Most everyone is using big name builders and the best parts money can buy all the while pushing the envelope as far as they can to make power within the rules. We have everything from inline wedge headed small blocks, to "conventional headed" BBC's making 1300+hp to spread port small blocks, to the fastest Pontiacs in the country making BIG HP and beyond. Most these guys will spend what it takes and take the time it requires to run up front. IF EFI was faster on track I feel pretty confident many would already be making the leap if there was something there. I salute Leonard and his efforts. He is a leader in innovation and not afraid to tackle something new. But he will admit it has not been easy and still is waiting to eclipse the ET he had with a carb.

So Im at the track one day. I parked right in the middle of a bunch of my customers. Over the loud speaker "lanes are open"

We all jump into a cars and start them up. All the efi cars are dying out. They are restarting and revving up their engines. I look my buddy who makes fun of my carb all the time and say Carburetor as I pull off. He knew what was up

For me fast comes before last. Carbs for life because at my age I don’t have time to waste.

John what year are the two porta potties in your signature

I think he's asking about the two port a potties in the background of the picture in your signature.

Hey don't be making fun of our porta potties. We have flush toilets up on the hill but they put those there for us oldtimes so we can go while waiting to race.

It's the new wave.... with fuel injection and boost, You don't need a whole tool box full of tools. All you need is a laptop and an allen wrench......

Fi=People who can’t tune and can’t use a screwdriver.

I can tune, and use a screw driver. But that sucks, why mess with changing jets and air bleeds, when you can stroke a few keys and jump right back in the lanes. I can usually make needed changes in less time than it takes my water pump and fan to shut off. Should I choose I can do it while belted in. With EFI I actually put more effort into tuning because its so easy, and I have more time to make more passes.