Interesting test...

I move the carpet from under the gas pedal and then floored it.
It went from 82% to 83%. Put the carpet back and it stops at 82% again. So, there's room for the pedal to go.

Next, I noticed there's actually a RUBBER pad under the carpet
keeping the pedal from reaching the floor (although very thin).
I removed this rubber pad and got another 1%.

So, I put the carpet back (without the rubber pad) and am now
at 83% (1% gain).

Here are 2 more options:
1. shorten the metal stopper under the pedal.
2. move gas pedal forward thus allow for more rotation of the gas pedal.

Both should give us more %, but how much I don't know. Anyone
got some time to kill?

rob

 

so I remove the gas pedal assembly and
manually twisted to it it maximum...

guess what, after a certain point, the pedal
keeps traveling but the number (%) stops going up!

Damn ecu, guess getting more travel from pedal
has it's limits. In my case, I only got 1 extra percent.

Looks like we'll have to either modify the pot signal
on the pedal assembly or get the TS ECU...

rob

 

Would've been funny if the throttle kept opening (i.e. closing) while the number went up to like 120%.... it sounded funnier in my head.

 

wouldnt be funny for his throttle body

 

(Bringing this back to life)

It seems like a TB mod would be more benificial than intakes, if it only opens 86%. Does anybody know if it is physically limited, or electronically limited? Is there a way to fool it into opening 100%? It's weird to have a sports car that can't go WOT.

 

its most definitle an electronic limitation......but who knows if the throttle open percentage = less than 100 actual opening.

I am getting an ecu reflash done next week on my car, so this is one of the things we will be trying to pay attention to.....hopefully we can try to yeild some answers, or at least a better understanding of what it/is not going on.

Adam

 

I'd bet there's that the inefficient plenum design limits the amount of air that can actually flow. It's probable that Nissan set the Throttle body to only open 86% because increasing it more doesn't actually result in more air flow. It's also possible that the TB itself is physically opening 100% whilst the autotap is only reading 83%.

If the first one is the case, then a TB mod might be a good idea when you get a plenum mod.

 

I am more apt to lean towards #2 to be honest, but I am giving Nissan the benefit of the doubt here.

 

Anyone with the TS ECU plug in an autotap and get a reading yet?

 

Funny, I was just having this conversation with a buddy of mine on the way home yesterday.

I guess I've been lazy about asking the question here with my own post but I've always felt that the car has two personalities ...Jeckyl and Hyde (sp?) if you will. If I bang through the gears from the start, the motor seems much stronger than if I roll it up to redline less aggressively. You can also tell when you get the motor working because it sounds different. I think you actually get a meaner sound from the hood, and less sound from the exhaust.

I tried to explain this to my buddy and my opinion was that the ECU knew what the driver was doing and adjusted the throttle (or something else) to compensate for your intended style of driving.

Maybe this post just confirms that I'm not imagining it. I wonder if the 80% people would get a different reading if they actually drove the car differently. And even if it isn't a percent of throttle situation, I am now more convinced that the computer is doing something that alters the character of the motor based on your own aggression.

 

I'll log mine Monday...getting it reflashed on the dyno Monday AM

 

I know what you are sayin. But, i'm not sure if it's that, or the flat power curve that makes that feeling.

 

Warning Lights....

I think his engine shut off after he quit at 100mph... then he dropped it in gear to get it started (lights going off).

That happens to me when:
1) Hard acceleration past 60mph and quickly going into neutral.
2) Going into neutral when exiting off the highway.

In some cases, my engine shuts off and all the indicators light up.

-Phuong

 

I feel the same way as you're describing. When driven aggressively, the car feels stronger than when moderately taking it up to redline. I wonder if this has to do with the Drive-By-Wire system?

 

its simply the self learning mods of the factory ecu.....happens in lots of OBD2 cars

 

I'm convinced there is something going on.

sschmuve mentioned the linear power curve, but It definitely feels like something else is happening. Anytime you take it to redline with WOT, but start from a more gentle roll, it never feels like the motor is doing anything, even though it has to cross the same point of throttle and RPM. I wonder if it is possible that you are going faster when you start out more aggressively, so the engine is able to rev faster for any given RPM and gear point. I can't visualize that clearly, so maybe it's not even possible.

I guess the other thing is that even if you do drive it aggressively, it doesn't always seem to do it. Maybe it's only when you really romp on it in one of the two lower gears to start.

I don't know ...I guess you could never prove anything is happening so maybe it is my imagination, but I swear it feels almost like a V8 when it happens. The character of the motor just feels different.

 

Progressively pressing the throttle is going to alter the torque curve and will "feel" like you accelerating faster/stronger. It's just an illusion. A steady torque curve works against the feeling of acceleration, just as a very sloped one in a boosted car feels much faster.

That's why i don't really buy into people measuring a mod by feel (i.e. butt dyno). As i've said before, you could actually lose low end torque and make your car seem to accelerate faster because the slope is altered.

 

Yeah I don't think there is any magic going on here. This feels like any other NA car I have owned, just weaker since it's a 6.

 

maybe some day if we are all good boys and girls we will know the truth

 

Do you know something that we don't?