hi I need help finding the trigger offset for a OBD2 b series distributor. I just finished the wiring for my b20 vtec turbo with a Fueltech ECU and just finished the base map so i read in some Link ecu forums that some people uses the trigger offset of 175 BTDC so I want to know which is the stock trigger offset. I'm using a k20 COP setup with the distributor CYP and CKP sensors. when I put the cyl 1 on TDC (Compression) the CYP sensor is facing to the opposite direction of the sensor that's ok? please all ideas or advices are welcome

 

Why not do away with the distributor and get a late model oil pump and timing gear. That will give you 12 teeth for a crank trigger. Then add a single magnet in one of the cam gears for a cam sync and have fully sequential ignition and fuel? You’ve went as far as a stand-alone , might as well go ahead and take advantage

 

But these engines should already have 3 toothed wheel sensors, CKP, CYP and TDC. More than enough resolution to run any stand alone sequential MPFI EMS. There should be one in the distributor and 2 already on the oil pump housing. If not, some JDM OBD2 have all 3 in the distributor, same combination, no need to remove or add anything.

 

I am not familiar with fueltech EMS, does it have an option for using a missing toothed wheel setup instead of using a trigger offset?

 

Actually the distributor I'm using is a JDM OBD2 and it have the CKP CYP and TDC and I'm using the CKP for rpm signal and CYP for cylinder 1 position with a 24 teeth configuration. Fueltech already have missing tooth configuration but since I can use the distributor sensors there's no need to use magnets. I'm a little confused cause in some haltech configurations I saw that as trigger they use something like 45 degrees BTDC and in some link they told me tu use something like 175 degrees so I wanted to know which was the correct one

 

What Fueltech ECU are you using, FT250 -300 - 350 - 400......?

 

I'm using a FT450

 

According to the Fueltech manual you don't need to use the angle offset when using a 12/24 + 1 toothed wheel Honda VR sensor input configuration.

 

you’re right there is no NEED to but using a late model b series crank sensor and a single magnet in a cam would be a lot simpler and cleaner once set up. It would also negate the need for any offsets in the programming if the ecu. Just seems like the better long term solution. That’s the route I’m going with a Holley ecu, and ls1 coilpacks that I already had laying around

 

Using the CYP and TDC sensors that the OP already has in his distributor for a toothed Wheel setup (No need for trigger offset) in Fueltech would be much easier and cleaner than him having to swap out an oil pump housing and running wires down to the crank sensors.

 

I said easier and simpler “once set up”. It would be a small amount of extra work in the short term but after that, it would be easier to deal with, I my opinion anyways. Plus you could get rid of the distributor and that would clean things up a bit. You act like running one cable down the back of the block to a sensor will just clutter up the whole bay.

anyways in the op it says “all ideas or advice are welcome” so I was just throwing out an idea and what I would do and am doing on my own car. All that said there’s nothing to argue about here. There is no right and wrong because it’s all a matter of opinion. Sorry you don’t like mine

 

Well yes, if he had asked what is the best way to convert to a fully sequential distributor-less COP ignition system, I would agree 100%

I am in the midst of doing the very same setup on my 85 Fiero GT.

 

Did you ever get this sorted out? I'm having trouble with rpm and trigger signals on a B20 with stock ignition setup.