could adding some resistance to the o2 sensors...

[no_doz]

on a tgp stock ecu, ive heard it runs very rich-what if a small (metered & thoroughly researched amount of resistance was added to the o2 sensor/sensors to trick them into reading slightly different? ive been trying to figure out ways to trick the stock ecu into running a little leaner, but not knowing it-while still not messing anything up or spending a ton on tuning right now, and the way i see it the car's o2 sensors/knock sensor are the only ways the car has of telling how rich the mixture is, as long as the mixture isnt altered enough to knock, i figure it should be fine-thoughts, ideas? i realize this sounds like that stupid iat mod, but im trying to achieve the exact reverse & not on such a "grandiose" scale (in the ebay claims they say 50hp & etc...)-am i wrong in this assumption?

[bszopi]

Just my opinion, but I think you are just asking for trouble by doing something like that. If the sees it the engine leaning out, then it will add more fuel, which will make it richer than it needs to be. In the opposite direction, if it sees the engine starting to get too rich, then it will lean it out more than it should and you will start to get knock, in which case the KS will cut back the timing.

[no_doz]

exactly-but the way the engine actually "sees" how rich/lean the mixture is-is by using the electrical signal delivered by the o2 sensors, as well as using the knock sensor (im not really sure how that one works), is there some other way that the engine can see how the a/f is? i figure if the computer sees via the o2 sensor/sensors that the a/f is a little rich because of additional resistance, then by theory shouldnt it lean the mixture out a little bit, making the signals sent to the computer-what the computer wants to see. am i wrong in thinking this? oh and thanks a bunch for your help man, you are always so knowledgeable

[IsaacHayes]

Easier to get a chip from someone that has a revised tune... :P

[no_doz]

lol that would be WONDERFUL!!-you know of anyone with such a thing? im REALLY wanting to adjust the tune on the tgp engine-but shelling out 300 for MS & doing all of the work to get it hooked up is just not going to happen anytime soon.

[Alxsmt]

i wouldnt even try to trick the computer, i believe under WOT it ignores the 02 anyways

[no_doz]

really? can i get a for sure yes or no from one of these limitless sources of information :P you know who you are

[bszopi]

i wouldnt even try to trick the computer, i believe under WOT it ignores the 02 anyways

I had to read this a couple times, but I think I finally get what you are saying. At first I thought you were backwards. But yes, whenever the car is at WOT (or say, >80% TPS), then the O2 sensor readings are ignored.

[Superdave]

I had to read this a couple times, but I think I finally get what you are saying. At first I thought you were backwards. But yes, whenever the car is at WOT (or say, >80% TPS), then the O2 sensor readings are ignored.

Yep

it holds onto whatever BPW correction that it's using before it enters PE and adds that to what it pulls directly from the VE tables, minus any corrections from other random tables. the O2 is ignored.

[IsaacHayes]

There was something like a TGP "top gun" chip that a guy would burn new chips with revised code, fixing some GM bugs and probably leaning it out. It made more power on just a stock engine. Do a google search for that. There might be others out there with similar code that are willing to share for free or burn you a PROM chip for cheap.

[no_doz]

sweet!! thanks man!!