OMB II stats

[bensemailis 10]

So, I got a bluetooth OBD II reader, and have been using it to monitor vitals (Coolant temp, engine load , ETC.) that are not part of the gauge cluster. One PDIF I noticed that made me curious was throttle position. Even when driving, foot in the floor, it never goes above like 80%. Can anyone else confirm this as normal?

[whitelespaul 3]

Great find! If what you say is true, I'd like to tweek mine to go to 100%!

[Luke Denton 1]

Yes this is true and can be changed but that is just one of many things needed to give the Spark a little....spark!

[Skids 108]

I dunno mine redlines quite easily.. 100% probably blow the engine.. or flood it

[bensemailis 10]

It's electronically injected, WOT would notnflood it. WOT doesn't mean high RPM it just means the engine can fully advance spark timing ad allow for more power

Edited June 26, 2015 by bensemailis

[Skids 108]

not flood flood but too much fuel its a tiny engine cant burn it all, cause knocking and pinging etc. increasing timing increases rpms, and vice versa. so wide open throttle sucking in all the air you can means it has to balance that with all the fuel it can and the baby cylinders cant handle it so they have to advance the timing to burn it there by increasing rpm to balance when the spark occurs. in small engines too much fuel and air isnt a good thing it has to rev harder to burn it all. Watch the video with the race guy test driving the spark even he mentions working on metros with everyone blowing the small engines. take off your air filter completely and watch how quick it red lines compared to stock. and the lack of performance you get from doing so. in a larger performance engine that can handle it or even a small turboed one ok.. i have good feeling you're doing more harm than good. not to mention the cpu tracks all programing and you'll probably void your warranty reprograming it. it's a tiny car with a tiny engine designed for commuting and sitting in traffic not winning races

[bensemailis 10]

This engine was originally turbo charged. The turbo was removed just prior to it coming to market. I understand its not a hiabusa motor, and its tolerences are lower, but the power it is producing is much lower then what it could. Timing advance is automatic in these engines, and without WOT being reached full advancement is not possible. Would it reach redline faster, possibly, but the power band would be changed dramatically.

[Gary Segan 1]

1) aftermarket OBD readers, are not always 100% accurate.. If its truly only 80% MAX, I would recommend using a GM TECH 2 or MDI/GDS on PC and recheck your APP (Accelerator Pedal Position) at WOT.. If the accelerator pedal is on the floor, (not restricted by the carpet, padding or floor mats) and the APP reads like 98-99%, it's good.. Then the electronically controlled throttle plate position in the TB at APP WOT, is commanded and limited by various factors, especially RPM'S, etc.. Do this, With KOEO (key on engine off) APP Pedal at WOT, is the throttle body plate/TAC Module at 98-99%? Probably is, which is great and normal operation. if not you would have APP /TAC code/s set and the likely reduced engine power message on.

Edited August 28, 2015 by Gary Segan