Hondata

I am street tuning my URGE Design ITB (Apha-N) set up. After I pull 6K RPM in high cam, the engine shuts off. It happened on 3rd, 4th and 5th gear pull.

The Datalog shows, right after TPS is reduced at 6112 RPM, AFR gets rich (Datalog at 2:23) then the engine shuts off. I have to crank to restart the engine. (popping the clutch while the car is moving does not start the engine)

I think it might be something simple but I am scratching my head. I appreciate your advice!

Cheers!

The engine also shut off with 2nd gear after a pull.

Played around with" over run cutoff (high cam)" between 15 to 32 (over 3000 rpm). It did not stop the shut off.

Is the MAP sensor connected and reading vacuum through a vacuum accumulator?

Have you set the MAP value fully closed and open?

Yes, a MAP sensor is connected and reading vacuum through a vacuum block.

I have not set the MAP value for fully closed and open. Can you explain how to determine the value?
Can I use the data log value for idle reading for fully closed? and WOT value for fully open?

Thank you very much for the help!

Yes you can do it that way.

It seems like this is the exact issue i'm having.

I have the values set based on figures i saw on my data log (10kpa closed and 100kpa open throttle) and it didn't change anything.

Judging by the calibration, someone has modified the column indexing as it is not the same as the Alpha-N calibration built into the software. I would recommend starting with that calibration and tune from there.

Thank you very much for the help!

I do not have the Alpha-N calibration built into the software. Can you share the calibration?

Thank you!!

What are the conditions that makes injector to stop responding?

TPS not scaling from 0% to 100% would be the first thing to fix.

I adjusted parameter table to scale from 0% to 100%. (by adjusting MAP value throttle fully open)

The engine still shuts off after high cam pull. After the pull, throttle make zero impact to the injector pulse.

Thank you very much!

Click the new calibration button in the software and choose the ITB calibration that has the Alpha-N enabled.

Thank you very much for the tip!

I hope the attached image is the one you are suggesting. Can I get conformation?
Other ITB examples are not Alpha-N.

Why does the TPS go up to 313% (not around 100%)?

Thank you!!

After a pull on high cam, TPS and INJ become 0% (overrun cutoff), then INJ no longer responds to TPS and engine shuts off.

What causes this?

Thanks for your help!

That is correct. Go to Options, and check show boost tables.