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Engine REV after swap manual transmission

 
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Old 05-16-2019, 07:00 PM
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Engine REV after swap manual transmission

Dear all.
Andi from Indonesia.

I recently swap from auto to manual transmission.
Car Honda Prelude, BB8, H22, JDM version.
When in auto, engine can be rev up to 8K RPM using tiptronic mode.
Now engine rev cut below 7K after swap manual transmission.

What need to be done/tweak to make 8K rev again.
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Old 05-17-2019, 12:14 AM
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Re: Engine REV after swap manual transmission

which ecu you use?
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Old 05-17-2019, 02:47 AM
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Re: Engine REV after swap manual transmission

>> which ecu you use?

Stock ECU (AT transmission).
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Old 05-17-2019, 07:41 AM
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Re: Engine REV after swap manual transmission

you need manual ecu
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Old 05-17-2019, 08:04 PM
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Re: Engine REV after swap manual transmission

>> you need manual ecu

Fine.

But just asking, why engine is able rev until 8K when in auto with tiptronic mode and AT ECU?
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Old 05-18-2019, 12:37 AM
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Re: Engine REV after swap manual transmission

auto ecu and manual trans wont work well together
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Old 05-18-2019, 03:10 PM
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Re: Engine REV after swap manual transmission

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Originally Posted by andisemesta View Post
>> you need manual ecu

Fine.

But just asking, why engine is able rev until 8K when in auto with tiptronic mode and AT ECU?
because you have auto ecu on manual transmission. plain and simple ecu don't know what is going on so limitations are set to protect engine.
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Old 05-18-2019, 10:47 PM
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Re: Engine REV after swap manual transmission

>> because you have auto ecu on manual transmission. plain and simple ecu don't know what is going on so limitations are set to protect engine.

Thanks.

Is it possible to fool/tweak AT ECU to be in tiptronic mode full time?

There is some kind of mechanism, when transmission in tiptronic mode,
ECU raises engine rev to 8K.

Maybe someone knows how to mimic this mechanism even auto transmission
has been removed.
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Old 05-18-2019, 11:20 PM
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Re: Engine REV after swap manual transmission

There is a modification that can be done to the AT ECU by removing 2resistors and adding a jumper. https://youtu.be/j5hlu16uU9c
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Old 05-18-2019, 11:33 PM
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Re: Engine REV after swap manual transmission

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Originally Posted by ogsmakdade View Post
There is a modification that can be done to the AT ECU by removing 2resistors and adding a jumper. https://youtu.be/j5hlu16uU9c
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Old 05-19-2019, 12:06 AM
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Re: Engine REV after swap manual transmission

>> There is a modification that can be done to the AT ECU by removing 2resistors and adding a jumper. https://youtu.be/j5hlu16uU9c

Thanks for posting.

Hopefully it will work for BB8, H22A, JDM version.
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Old 05-19-2019, 12:24 AM
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Re: Engine REV after swap manual transmission

Just open ECU.

Cant find R17 and R18 resistors.

01.jpg

02.jpg

Last edited by andisemesta; 05-19-2019 at 12:26 AM.
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Old 05-19-2019, 09:43 PM
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Re: Engine REV after swap manual transmission

Found this somewhere.

Auto to manual P5M ECU check engine light:

- Find resistor RP13
- Remove resistor
- Solder resistor at RP14

Has anybody tried these steps?

Does it eliminate REV limiter?

Or it just turns off CEL?
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Old 05-20-2019, 11:59 AM
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Re: Engine REV after swap manual transmission

Will get rid of the idle issue, should get rid of the check engine light.
Move RP13 to RP14
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Old 05-20-2019, 06:04 PM
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Re: Engine REV after swap manual transmission

Just did it last night.

Something strange.

Parking light (P) now on.

VTEC doesnt engage.

REV still 7K.
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