SCS Delta 400 Users Group

hiro(japan) said:

Note3 Race Exhaust Cans

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I see this note , you must have it. You can ask SCS to be sure. Many here have plugged the throttle body passage between the throats. Turn off the Idle air control in the ECU wuth SXTune and set the idle manually with the stop screw . Many here have done this with excellent results , myself included.

Thank you for reply.
We recognize that the IAC valve is an important part for stable idling, so
I'm surprised the IAC valve needs to be removed.
I have contacted SCS, so I will wait for SCS to contact me. (New map and response method)
If it still doesn't work, I would like to delete the IAC valve.

Do you know how to deal with Overrun's afterfire (2000rpm)?

After checking "Overrun Fuel Cut-off Variabes",
Upper RPM 2500, Upper RPM 2000, so
I thought this was suspicious, so I set the PRM to 7000~7500, but
There was no change and afterfire occurred at 2000rpm.

I'm waiting for your reply.

hiro(japan) said:

Do you know how to deal with Overrun's afterfire (2000rpm)?

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Is this decelleration popping (decell-pop) with the throttle closed ? The throttle body throats blocked may solve this also with the over rich condition caused in the other cylinder with mixture robbing and O2 sensors trying to compensate .

Thank you for your reply.
yes. Popping of deceleration.

I will check the points you have pointed out.

thank you!

I just purchased 961 and there are many things I don't understand.
This forum is helping me.

I'm sure I'll ask another question, but thank you in advance!