What sensor would you suggest using in the fjo units, there are two options, and Im not sure if there are better options out there. Bosch or NGK units.

 

AFAIK, the FJO has always required the use of the NGK sensor, and not the cheaper Bosch sensors (which don't work as well anyway). Of course, you could always just contact FJO and get the answer straight from the source. And in less time than it took to post this thread and wait for answers.

 

I think you should use the one they sell , and supply with the WB kit .I think its the Bosch NTK ?.

 

I know the answer and if you respond to my ims re the speaker enclosures I'll be happy to share!

 

FJO recommends and sells the higher quailty NGK units. Use the NGK.

 

err. Higher quality NGK? Where has that little gem come from. Sounds a little urban legend to me.

 

FJO designed their kit around the NGK sensor. The sensor that comes with the kit and their replacement sensors are NGK sensors that have been hand-picked/calibrated by FJO. That is part of the reason for their high cost. You could probably get very good results with the off-the-shelf NGK.

The Bosch sensors do not seem to handle the exhaust temps of the rotary very well and have different operating conditions in general that make them less suitable for the rotary than the NGK. This is based on what I have seen from a lot of FD owners' experiences with different wideband setups.

The Bosch sensors are ok to use, when the wideband controller was designed with them in mind (Innovative, Techedge). The fact remains that the FJO kit is designed to work with the NGK sensor, it stands to reason that that sensor will give the most accurate results and reliable operation.

 

Fine if the FJO is only designed for the expensive and hard to come by NGK units, but that doesn't mean its higher quality.

Should be noted that, if you are running the probe in a location that will cause problems for an LSU-4 will also cause considerable innacuracies in an L1H1 unless you have a thermocouple as well allowing you to solve the water balance equation, which the NGK is sensitive to due to the construction of the nernst cell.

 

whats the water balance equation? do u mean getting water on the sensor while its heating up and cracks the ceramic?

 

i have the heat sink or thermocouple from innovate do i still have to start the engine first to blow out all the consensation b4 i turn on the sensor? thanks

 

Both FJO and Motec describe 1.5% higher accuracy with the NGK unit over the Bosch. Minute as it may be, it exists.

Personal experience in using the bosch have found them unable to cope with the rotary exhaust temperatures when placed close to the exhaust ports. After burning out 3 bosch units, I switched to an NGK and have had no problems since.

Based on this information, I determine the NGK to be of higher quality: more accate and more durable.

 

The water balance how the EGT affects the partial pressure due to the reaction between HO and other ions in the exhuast. Well documented in the NGK patents. Bruce Bowling has posted all the maths behind wideband control if anyone is interested.

The motec controller is actually not very good, so for them to claim 1.5% more accuracy is laughable, as there innacuracies in the inherent design are greater than 1.5%. I would take an innovate with the LSU-4 over a motec any time.

The design of the LSU-4 (planar) actually allows for faster diffusion of ions across the sensor, giving faster and more acccurate readings WHEN CONTROLLED PROPERLY. Only really of interest to saddos like me who actually look at how the different wideband units are designed rather than just plug in and go.

Bill

 

Anyone want an FJO kit to buy ???