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There. Fastest guy on the board said it. Are we done now?
87% *IS* indicative of a tune. It's a known fact.
It IS NOT.
And this is the exact reason why you should not try to stop the research for factual data.
BTW, all those search results?
The numbers for untuned don't even match, some type 60%, some 70 degrees, some 74% and not one of them posted first hand not tuned numbers, only first hand tuned numbers.
First of all a lot more detail has to be discussed, so that we can sift out the useful information.
Was it 87% opening, or was it 87 degrees angle of opening?
Was it Absolute throttle position or relative throttle position?
Take a look below at the throttle percentage with accelerator resting.
How does it correlate to the throttle actuator percentage? Is the actuator supposed to peg 100%, or not?
Easiest way is to have one known stock car obd2 readings. I think that is mine, but let's see a stock car owner post numbers, to confirm mines.
It IS NOT.
And this is the exact reason why you should not try to stop the research for factual data.
BTW, all those search results?
The numbers for untuned don't even match, some type 60%, some 70 degrees, some 74% and not one of them posted first hand not tuned numbers, only first hand tuned numbers.
First of all a lot more detail has to be discussed, so that we can sift out the useful information.
Was it 87% opening, or was it 87 degrees angle of opening?
Was it Absolute throttle position or relative throttle position?
Take a look below at the throttle percentage with accelerator resting.
How does it correlate to the throttle actuator percentage? Is the actuator supposed to peg 100%, or not?
Easiest way is to have one known stock car obd2 readings. I think that is mine, but let's see a stock car owner post numbers, to confirm mines.
that's what I'm trying to figure out.bot one single post showed actual proof and people were just throwing numbers around.
Throttle position TP is 87%. This is an absolute parameter, since with accelerator resting, it is at 15%
Throttle Actuator Command Percentage TAC_PCT is at 100%.This is relative, since it is at 1% with pedal resting.
Throttle position relative TP_R is 74%, this by definition is the relative actual opening percentage and I interpret that 3% opening of it with pedal resting as a mechanical value (maybe it is opened at 3% for idle, even with key off)
TP_B is another absolute reading.
The others are Accelerator pedal position sensors, that are relative.
So here is what I think:
I obviously acknowledge what people that have tunes posted as far as the percentage that they see.
My question is regarding the numerous details (which of the throttle position differs, were there angle, or percentage differences and is it possible that the difference only shows while driving and over 5500RPM).
I continue to think that my car is not tuned.
At this stage I think that maybe the TP_R, the relative position is where the difference shows, which would mean that my car is at 74%, while the tuned guys are seeing the TP_R at 87%.
Obviously, the confusion here is that the "generic" TP, is an absolute value and it so happens that it reads 87%, therefore I try to get the details sorted out.
wheres J-cart when you need him? Pretty sure he's the only guy besides mario actually qualified to speak about things like this due to their extensive knowledge of these cars
2012 P31 C63 Coupe Trackrat, 2019 GLE63S Coupe Beast
Originally Posted by MJames2
wheres J-cart when you need him? Pretty sure he's the only guy besides mario actually qualified to speak about things like this due to their extensive knowledge of these cars
Says the new guy with 16 posts who can't even get jrcart's name right
I'm hoping to get my car scanned on STAR tomorrow at Eurocharged.
From what I understand, via an OBDII scanner thing the trump figure is 89% or something like that, but via STAR it's 78% (or something in that range).
I'm told that I will be able to obtain individual throttle body voltage at WOT, which should tell us which one of my throttle bodies (or both) have crapped out.
Does anybody here know what the max voltage per throttle body should be? I'm guessing we're talking about TPS voltage.
On non-STAR systems, the trump figure is indeed 87% as it's worked out as a ratio of 100....or something like that. I can't remember the exact ins and outs of it.
Here are some logs.
The first one from the left is with traction control on.
I'll post the details:
RPM, in pink climbs to 6610 RPM
Throttle position maxes at 60% and relative to 48%, at 5250 RPM. Then although still floored they drop to 52 & 40 %
The second one is with traction control in sport mode
RPM climbs to 6900 RPM
Throttle position maxes at 61% and relative to 48%, at 5100 RPM. Then although still floored, they drop to 52 & 40 %
The third one is with traction control off
RPM climb to 5850
Throttle position maxes at 60% and relative to 48%, at 5150 RPM. Then, although still floored, they drop to 52 & 40 %
Fourth one is with traction control off
RPM climb to 6230
Throttle position maxes at 60% and relative to 48%, at 5050 RPM. Then although still floored, they drop to 52 & 40 %
Here's how I interpret this:
With the engine off, the throttle opens to the stops, which are 87% and 74% relative.
With the engine on, un-tuned, the most the throttle will open is 60% with relative 48% and this is no further than 5200 RPM, then it drops to 52 & 40%.
In order to determine if you have a tune, you cannot check the logger with the engine off, you have to do pulls and don't worry about traction control, the results throttle wise end up being the same.
I find that information really interesting. My scan was done with the engine off. I think I now need to get it scanned with the engine running on a dyno or on the road.
Here's how I interpret this:
With the engine off, the throttle opens to the stops, which are 87% and 74% relative.
With the engine on, un-tuned, the most the throttle will open is 60% with relative 48% and this is no further than 5200 RPM, then it drops to 52 & 40%.
In order to determine if you have a tune, you cannot check the logger with the engine off, you have to do pulls and don't worry about traction control, the results throttle wise end up being the same.
Now that is some great, useful info! Guess the self-appointed forum policemen don't know it all after all.
my car only spun to 6792 rpm and throttle was 86.3% my car has the unicorn tune as most know. i did just bore my throttle body shafts, LTH, custom intake mods, row and thermal intake spacers.
my buddies car has row, ec v6 tune
his throttle went 87.5 mins did 86.3 and IAT is also a mystery.
thoughts?
09-21-2016, 12:45 PM
