PASHN8 wrote:Phil, what non-FM 02 clamp are you running? What cost and where did you get it form? I noticed earlier you said that a non-FM 02 clamp will work better than the FM version, so i'd rather that that waste time with the FM model.
Firstly my comparison is based on FM 02 Mod ver 1 not Non FM 02 Mod. Not having the FM 02 Mod Ver 2 in front of me, I cannot confidently say without a doubt it works any different to there previous version.
However, going over the schematics of the FM ver 2 02 mod, the princples are no different to the previous version ie operates under vacuum and clamps the 02 signal at .3V. The only difference with this version appears that is easier to hook up because you do not need to tune the voltage, its pre set.
The ability to alter voltage is important because you can adjust to the amount, according to how much your car is "bogging ie hesitating" during closed to open loop. 0.32 V = lean, 0.47 = stoich, which will neutralize the effect of the ECU until it goes into open loop.
As you may already see .3V may not be adequate and still cause a lean condition, causing bog. Im running about .35 V on my non fm one and activating under boost, so perhaps that may have a bearing as to why i dont feel so much bog.
Again each car is different and you have to set the pressure setting to your altitude you live in (ie 1 psi at 2000 meter above sea level is not the same as 1 psi at 200 meters above sea level) and clamp the voltage according to how much your car bogs. Increasing the voltage too high will neuralize the effect of the ECU into open loop and dump alot of fuel which isnt great for economy.
You can find this Non FM 02 clamp for sale via miataturbo.net, look up the user Olderguy. He makes them and sells them.
So you are saying that given some time, it is possible to fix most of this without the need for an 02 clamp whatsoever by use of these TPS setting within the Haltech itself?
Provided you find a tuner who knows what his doing or your confident enough to set up the extra injector map and or I guess the TPS signal setting, then yes I dont see why it couldnt be done.
Will it get rid of it altogether, again im not 100% confident considering, emanage and some XEDE users still claim some kind of bog.
Proper testing is required, ie need to see the 02 signal from from 0 to 6500rpm not someone claiming "it get rids of 20% without proof".
What happened to the other 60% are any of the other piggybacks clamping the 02 voltage, or running a 5th injector map to get this 60%?
I am not 100% convinced of this DYI TPS fix with the FM 02 clamp for reasonas already mentioned above and that messing with the TPS signal leans the car out. This can be be problematic if you got no engine mangament to mess with fuel.
I am not saying that the FM 02 mod is a bad product, contrary you should get it or any 02 mod for that matter to help fix the lean condition. Dont expect $100 mod to totally fix something that really costs $1800-2k to rectify.
Hopefully lachlan takes notes from vishnu and not stephanie..
