GTRay

I noticed something in my logs tonight that struck me as odd. While my accelerator position sweeps the expected full range my indicated throttle opening is pegged at 66.69% when i'm most assuredly at WOT. the Accelerator Position reading does not seem to correspond to indicated throttle position.

interestingly i noticed that the closed loop throttle exit was set at 70% over 3000rpm - i'll need a few more drive cycles and logs to verify but i wonder if this was keeping me in closed loop under otherwise WOT conditions... hmmm....


i did bring that throttle exit down to 65 to make sure i was exiting closed loop at WOT.

according to my logs and the throttle control maps i should have been reaching much higher indicated throttle openings than i was.

Ideas?

Ray

TeamRX8

iTrader: (25)

please stop posting pointless new threads

https://www.rx8club.com/series-i-do-yourself-forum-73/diy-how-use-search-function-rx8club-com-forum-73846/

GTRay

I always wondered how to get a post count that high...

TeamRX8

iTrader: (25)

there is no shortage of lil' Billys, which is also exactly how he would reply, be sure to pay attention at the 1:30 mark



.

oltmann

It is normal. The value the Accessport logs is "relative throttle position." This is the value used for most of the table lookups; closed loop exit, throttle enrichment, etc.

GTRay

Thanks for being informative AND useful.

Ray

MongoRX

iTrader: (1)

It seems that a lot of people in here quick to put people down and just tell then they are stupid for not knowing or just searching for an answer. Trust me the search engine isn't that great on here. Google is marginally better. Its starting to feel like a Honda forum in here

TeamRX8

iTrader: (25)

it feels liike every forum where people who have 7 plus years of experience get tired of the same situation every day, the answer has been discussed ad nauseum already and is quite basic

Learning proper forum etiquette and how to search would be more useful, he just doesn't know enough yet to know any better. Furthermore I didn't call him stupid, yet he proceeded to make some childish commentary regarding my post count. Then somebody else has to come in and provide a completely skewed assessment of what actually occurred.

So yes, in that regard it is feeling more like the Honda forum.

GTRay

I am absolutely no stranger to "forum etiquette". Just because i choose to be more of a wallflower does not mean i can't or don't observe common courtesy to those on this or other forums. I am by no means new to this. My involvement in rotary related social media goes back to the "Big List." Remember those days - circa AOL and dial up, when the FD was still sold as a new car and Trey Cobb, Brooks Weisblat, and Kevin Wyum had achieved things in their cars that few thought were possible? Remember Beta testing Napster in #rx7 on EFnet all those years ago with Steve Kan and Brian Cain? Come to think of it i don't remember seeing you there. Don't question how much I know about these forums. I was an original member of rx7club.com before it got wiped and then restored to its current status.

The childish commentary is nothing more than an in-kind response to your sophomoric campaign to "teach a man to fish."

More to the point I searched the following terms

Throttle position datalog
throttle position
throttle
throttle datalog
throttle cobb
throttle AP

Not a single response to those searches netted a thread title that seemed promising. I did however proceed to search within the three most relevant threads that were common amongst those search terms. while the subject had been discussed, the answer to my question was still elusive. Most replies were to check the physical function of the throttle body in comparison to the readings.

By this point i had spent more time than desired searching for an answer that was extremely easy for someone with enough experience in the subject to answer.

I get posting that type of stuff for the person that comes on here and asks when his car is due for a timing belt - really, i do - but come on, really?

Ray

wcs

iTrader: (2)

Search this way ... this thread comes to the top due to the date....

http://bit.ly/yjNMIT

the site:rx8club.com is the important part

The other problem is many members provide terrible thread titles ...

edit ---
I'll just get this out of the way as well ... when you are in open loop the STFT reads -0.16 not zero .. -0.16 means zero to Cobb I guess <shrug>
And the Knock sensor never picks up anything except perhaps a bad motor mount.
Oltmann can explain wtf is going on there.

GTRay

ahhhh....hah, classic!

See, now that i enjoyed!

Glad to get those other items cleared up, weren't really bothering me much but thanks anyways!

Ray

TeamRX8

iTrader: (25)

My childish commentary?

Funny, I don't recall you stating that you were having trouble finding it and asking for some help as opposed to trying to make some meaningless correlation about my post count. If you had, the outcome would have been completely different as other people in similar situations have discovered when it was handled that way.

You have a long way to go before you start judging the actions of other people. You can start by taking some responsibility for yourself rather than trying to paint all the blame elsewhere.

lastphaseofthis

My 'theory' is simple voltage drop across sensors/wires/the Modules that run them. i bet there's a few extra ohms of resistance and if you would get the extra down to 0, you would see 0 in cobb. $.02

oltmann

The values are converted from floats in the ecu to integers before being transmitted over the can bus. Then they are scaled back to floats in the AccessPort, doing math on floats near zero requires special handling.

http://en.wikipedia.org/wiki/Denormal_number

lastphaseofthis

Yeah, that was my Other theroy.