gibby1980

My boost levels are 10psi flat, 14 (low boost). 18 (high).

I have a JAM on my ep82 with a toytuning Hybrid (I know, quite old). The JAM over fuels even at with stock fuel components. On my wideband (AEM) you read 10 flat once the boost hits 10-12psi. I guess that was done to compensate for the timing increase you will notice @ 4K rpms onwards.

What do your AFRs look like at 1bar?

I read some even went to 18psi with this setup with an uprated fuel pump , FPR etc. A wideband is a must. I have a JAM ecu and once you go over 10psi, AFR is at 10 flat.....you can occasionally see 10.5-11 but that is quickly brought back to 10 flat on the wideband. Use proper fuel and change your fuel filter as well.

Is the hose connected to your map sensor from the intake manifold?

the original ecu will work with the decat. Once boost levels don't trigger the fuel cut. Keep the boost at 12psi max. How much for the ecu?

Hi Mike, Here in Barbados different grades aren't available at the pump sadly. I think 86 - 90 RON (I would have to confirm that) is what we get. I use octane boost along with that. Thanks for your input by the way mate.

That is a picture of the state of the spark plug. All four of them are like that. http://i1314.photobucket.com/albums/t576/Jason_D_Gibson/plug_zpsa43f2c15.jpg

Just to add. I did the reset and that did not change the the AFR's once the ecu settles. At WOT and 18psi the gauge would show a solid 10. I have seen it going to 10.6 when nearing 8k rpm but the ecu knocks it back to 10. I have tried hotter plugs with a closer gap and I still see the same 10. Note: I read 11.5 - 11.7 only when the boost is under 12 psi. Once you go over, the JAM ecu takes it to a full 10. My AEM reads the 14.7 - 16.5 on idle.

Good Write up. I shared this information with the Starlet group here in Barbados.

I am in the same boat. I have a jam fitted and even at 18psi my AEM is at 10 flat. Once I saw it reading 10.5 but that lasted only for a few seconds. I will try the reset ecu option to see if that makes a difference.