Low end power difference would still show up on a dyno, though. Part throttle acceleration can still be mapped if you log throttle percent during the run and go up and down the rev range a few times under partial throttle. If 30% throttle before and after shows a difference, I'll bite and call it an upgrade. I suspect that wouldn't be the case though. You can also map "tip in" by plotting the profiles of power if you apply throttle suddenly mid-run. You'd just need a shop willing to export some raw data.
Dyno charts are commonly just full throttle pulls, but they don't need to be.
You could lighten the throttle body cable or tweak the profile to be eccentric to make the motor "seem" more lively, but it's all a false sensation.
Call me a cynic, but I need dyno data to grasp the claimed benefit here. If it causes benefits you can't see on a dyno I have a real hard time believing you're not feeling the placebo effect.
I hear ya. And I can understand the cynicism. This post isn’t to try and change your mind, I just want to make sure others reading this get all of the information.
In a previous post I stated that installing an 05-06 manifold alone, no other mods that weren’t already there, caused my turbo truck to need an extra 50hp worth of fuel.
What this means is that by volume, to keep afr at a safe level, installing only the intake required an extra 50hp worth of fuel.
Fuel doesn’t lie. If you need 50hp more fuel, 50 hp was gained.
I later started playing with injectors.
I don’t expect an NA truck to gain 50 hp, modifications made to a turbo engine will compound those of an NA engine. But I do know that the 05-06 intake will make a difference. Especially if you have long tube headers. And for sure if you have a turbo. I recommend buying one from your local wrecking yard. They typically sell for $150-$250 with fuel rails, which you’ll need.
As for the injectors, for anyone on the fence. Hang back. Watch what happens. Don’t jump on a band wagon and buy on a few guys word.
As guys get these on their trucks, you will see more and more positive testimonial. That is far more convincing than dyno sheets. Real, actual members of the forum seeing a real difference. These are huge in tundras right now.
Better fuel atomization isn’t placebo. It’s science. If the droplets are smaller the liquid gas will vaporize sooner and more completely so less gas is blown out the tailpipe only partially burnt. This causes you to step on the gas pedal less. Which increases fuel economy.
It is afterall the vapor which is being ignited since liquid gasoline doesn’t burn.
In other vehicle groups upgraded injectors are super common and known to be a performance increase.
I’m actually ashamed of myself. I’ve been a leader in Tundra performance modifications for the last 15 years and I had never looked into injectors. I just assumed that there was no benefit to them on a vehicle that can’t be tuned. Well I was wrong. A friend of mine did a 4hole upgrade on his older land cruiser. Stock is a one hole squirter (not vaporizer lol). So I looked into an upgrade for our 4.7. I was astounded when I found out that I could affordably build an upgraded injector for our trucks.
I have since run no less than 10 sets of various prototype injectors. This is on my 03, remote mount low boost, 05-06 manifold, jba long tube headers, running on e85 daily driver nonetheless. I’ve had it on the dyno (full throttle) and the above modifications were good for full 100hp over stock.
Anybody else with any questions please post em up here. I’ll do my best to help.