How does the Auto decelerat?

[Bitsyncmaster]

I've been working on an idle ECU update and just wondering what the difference there is between an auto or 5 speed.

I know with the 5 speed some owners may keep the engine engaged right down to idle RPM. I'm not one of those, I press the clutch when I'm ready to change gears to downshift. Even press the clutch coming to a stop way before nearing idle RPM.

So with an auto, I would think the dropping RPM would be much slower because the car movement is still helping the engine RPM to drop slower. Is that a correct assumption? I was wondering if I should have a user switch that changes some software timing for an auto.

My new software uses the idle switch input signal so running without the idle switch is not an option. That signal lets my software know when the user has let off the throttle.

Still don't know why an auto with stage 2 would cause problems other than it could fake out the lambda with high duration cams.

[81dmc]

I've been working on an idle ECU update and just wondering what the difference there is between an auto or 5 speed.

I know with the 5 speed some owners may keep the engine engaged right down to idle RPM. I'm not one of those, I press the clutch when I'm ready to change gears to downshift. Even press the clutch coming to a stop way before nearing idle RPM.

So with an auto, I would think the dropping RPM would be much slower because the car movement is still helping the engine RPM to drop slower. Is that a correct assumption? I was wondering if I should have a user switch that changes some software timing for an auto.

My new software uses the idle switch input signal so running without the idle switch is not an option. That signal lets my software know when the user has let off the throttle.

Still don't know why an auto with stage 2 would cause problems other than it could fake out the lambda with high duration cams.

Not really. The rpm immediately drops off a few hundred RPM and bleeds down like a manual from there. It hits idle though much earlier than the manuals.

I can take a couple driving vids next week if you want.

[Bitsyncmaster]

Not really. The rpm immediately drops off a few hundred RPM and bleeds down like a manual from there. It hits idle though much earlier than the manuals.

I can take a couple driving vids next week if you want.

That would be helpful to see the RPM gauge when coming to a slow and a faster stop. Thanks.

[Timeless]

Stage 2 auto: I can attempt a video tomorrow if I take the car out.

[Bitsyncmaster]

Stage 2 auto: I can attempt a video tomorrow if I take the car out.

That would also be great.

[Timeless]

Just recorded this. To a stop from ~55mph - no A/C on. Let me know if there is anything specific you need recorded.
https://youtube.com/shorts/a_b0zoAzKXg?feature=share

[Bitsyncmaster]

Just recorded this. To a stop from ~55mph - no A/C on. Let me know if there is anything specific you need recorded.
https://youtube.com/shorts/a_b0zoAzKXg?feature=share

Thanks that helps a lot. Really slow RPM dropping. I think I know what to add to my software for a user switch if auto or standard.

[Bitsyncmaster]

Well working on my idle ECU update has stopped. Looks like my FD has a problem. Acts like it sticks and then jumps on the mixture. I have been having issues for many years since I stopped driving it enough. It started with poor cold running on the road but idle is OK. Now I get the dwell reading holding at the minimum value but I work the adjustment I can get about 30 degrees but it wont hold.

So looks like I need to rebuild the FD

[Ron]

You might check the roller bearing for the plunger, while you are in there...

[Bitsyncmaster]

You might check the roller bearing for the plunger, while you are in there...

I will but it feels like the air plate has pressure building up even with no rest pressure.