Part throttle faster than full throttle
 

I noticed that when I am accellerating using half throttle and then push the pedal to full that the car seems to accelerate slower or bog. Has anyone experienced this?

I've only noticed full throttle bogging when I go from no/light throttle to full throttle at lower rpm's, and it only lasts for a second. When I go from half throttle to full throttle, there is a notable increase in acceleration for me.

Stock or remapped?

Actually yeah I was thinking about that two days ago. I feel that our car reacts more around 4 rpm.

I noticed the same thing today as I was heading home. Floored it trying to cut around traffic and felt the bog as you've described at full throttle. Slightly annoying, not sure what could fix this.

Stock.

I noticed the bogging on WOT with the stock map too

In theory you may get a gain lower in the rev range with a slightly closed throttle as this keeps the gas speed up but as you approach higher rpm the throttle will then need opening up

is this the case?

I believe you're just feeling the torque dip fellas!

Exactly. You only notice it when you stomp on the gas and expect to go somewhere.
This is definitely a driver's car. That doesn't just mean it's fun for a good driver. It also means you have to drive it well to get anything out of it, but it will reward you if you do. When you find yourself in a situation where you anticipate a likely need for sudden acceleration, downshift so you are above the torque dip and ready to go. When you stand on it, the car will take off nicely. Takes a little getting used to cruising along at 50 or 60 with the engine buzzing at 5,000 rpm but it works and it isn't usually for very long.

Could be, but it also could be the fact when we're going WOT, we're expecting the force of acceleration (151lbs of fury!:)), so our bodies naturally tense up and bracing ourselves and therefore numbing the sensation.

I always feel like my 450+whp STI is slow when I drive it but, when someone else is driving and I'm in the passenger seat, I'm like :eyebulge:


Just a theory :)

http://www.avoturboworld.com/avoshop...2007-p-58.html

Seems that we all notice this behavior in late model Subaru's and drive by wire systems.

thats most small engines.. goin full throttle at a low rpm is jus flooding the engine with air that it cant use yet, which is also compensated with more fuel

I noticed a while ago that after about 3/4 peddle there is no diff in power if I floor it. Thats in any gear any rpm. I believe it to be the drive by wire as well.

I'm gonna take a stab at the cause.

While you're at part throttle the ECU is running in closed loop mode, meaning that the sensors that provide feedback to the ECU so it can adjust trims such as air fuel ratio, cam phasing and ignition timing, are active and the ECU is using them to adjust those trims.

When you go to full throttle the ECU goes to open loop mode, no longer accepting those sensor readings, and using factory tuned maps to determine the engine parameters.

Clearly your ECU has found that's it's safe to run more aggressive trims then the factory WOT maps.

If I were you, I'd thanks the gas gods for having decent fuel, and contact a tuner.

The only feedback during closed loop is for AFR target, which is 14.7ish for closed loop mode. all the other maps, ignition, cams phasing etc act the same regardless.

So, does that mean my explanation and thus understanding of this is plausible? Other then the AFR?

It's to do with gas velocity.

I would think that with a partially closed throttle body the MAF would see less air flow and adjust the fuel accordingly. Less air, less fuel, less power.

Lots of good theories so far. I have nothing to add, but I do hope this is the case:

i noticed the same thing lmfao thought i was the only one.

@wholeeoh, your username instantly reminded me of Ling and Ling's Father from Kung Pow.

Definetly noticed it too. I'm subscribing to the open/closed loop theory. Notice it both stock and tuned (N/A)

Not really IME. It's more a phenomenon of more modern/economical engines seems to me. I've often thought it was part of an EPA and CAFE conspiracy for some automakers to keep their numbers up. I've driven plenty of older small displacement engines that respond at will during WOT. Depends on the design and tune of the engine I'd say. I don't see why bigger engines w/ more mass and frictional losses wouldn't be worse by that logic.

And yes, I noticed the part throttle effect during the gentle part of my break-in cycle. Was wondering if it was only in my head, guess not.

Because engines are happier running at stoich than richer mixtures, right?! :barf:

Stupid question.

But what is 'bogging'?

Not sure the origin but I always interpreted it as meaning you expect to take off in a sprint but move like you are running in a bog.

It's essentially lag, or a delay.

When you push your foot all the way down on the throttle, you expect an instant response from the engine to go faster. This is usually coined as throttle response.

Bogging is when you don't get instant response from the engine. There is a delay of time before the car starts to accelerate fast. Bogging can be as quick as a split second, or as long as several seconds or more.

I wonder if traction control has anything to do with it.

Brake dance, anyone?

When I tried out the Torque app, it indicated the throttle being at around 80% max even though my foot was smashing the floor... related?

just to clarify. What I meant with bogging was when your in lets say 3rd and accelerating at 3/4 throttle then push the throttle to the floor, the car feels to accelerate slower. Its still accelerating, but not as fast as 3/4 throttle.

how old are we talking? carb or cable throttle

Cable. No jets.

hmmm i cant remember how my civic acted all motor but turbo its definitely quicker part throttle, spools quicker too

I’ve been running an ecutek tune for a good while now and I only just noticed that in between 1-2k rpm if i put my foot all the way down, the car struggles to accelerate. Cant be torque dip as it’s been tuned to remove it. Really weird as in 6th gear it actually slows down when my foot is all the way down. Please help :)

Stay out of the 1-2K range when not in first gear.

Part throttle faster than full throttle
 

Putting your foot down hard under 2k rpm in a high gear puts extreme stress on the bottom end. That’s the vibrations you’re feeling. It’s not meant to accelerate in that regime, it can severely shorten the life of the bottom end.

Even if you had a big inline 6 or V8, piston engines don’t like high torque under a certain rpm.

8 years

https://forum.worldofwarships.com/ap...3f8d1853da39ff