D14A3 75HP > 90HP

General discussions on EJ9 and D14 improvements. How far can you reach?
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rupert
Posts: 3
Joined: Fri Mar 06, 2015 11:15 pm

D14A3 75HP > 90HP

Post by rupert »

Hey guys. Complete noob here. I have an EJ9 D14A3 Civic and recently found out that this engine is almost identical to the D14A4 engine other than being restricted to 75hp by a gasket in the throttle body. My goal here is to gain access to the extra 15HP that my engine is capable of producing!

I've easily managed to locate this gasket but not sure what to do next. I've spent days online trying to find out how to get the extra 15HP out of my engine but I'm not having any luck. Do I simply remove the gasket? Or must I replace it with the gasket from a D14A4 engine? Or something else?

Any help would be greatly appreciated!

Rupert :)

Hellraiser
Posts: 7
Joined: Wed Nov 12, 2014 7:37 pm

Re: D14A3 75HP > 90HP

Post by Hellraiser »

Hey there,

you simply need to replace your metal gasket with a new gasket you can buy at your local Honda dealer. The part number of the gasket is: 16176-P2A-004

rupert
Posts: 3
Joined: Fri Mar 06, 2015 11:15 pm

Re: D14A3 75HP > 90HP

Post by rupert »

Hellraiser wrote:Hey there,

you simply need to replace your metal gasket with a new gasket you can buy at your local Honda dealer. The part number of the gasket is: 16176-P2A-004
Hi Hellraiser, thanks for the reply. That cleared everything up, thanks for the part number also! :)

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BETEK
Posts: 1213
Joined: Wed Oct 21, 2009 10:09 am

Re: D14A3 75HP > 90HP

Post by BETEK »

Simply change gasket and you will gain immediately 15hp
viewtopic.php?f=15&t=724&hilit=parts+number

rupert
Posts: 3
Joined: Fri Mar 06, 2015 11:15 pm

Re: D14A3 75HP > 90HP

Post by rupert »

BETEK wrote:Simply change gasket and you will gain immediately 15hp
viewtopic.php?f=15&t=724&hilit=parts+number
Thank you so much for that list, will come in useful :mrgreen:

Dawe_86
Posts: 3
Joined: Mon Jul 05, 2021 11:09 am

Re: D14A3 75HP > 90HP

Post by Dawe_86 »

Hello
Got a quick question about this topic
I got a D14A3, with the plate removed
And currently with no compression on piston n. 2
Also while changing spark plugs I noticed how white they are, wondering, if it is running too lean thanks to the different ECU? (P3Y vs P3X)
Also noticed that injectors have different coding, but not too sure how different are they otherwise.
I was wondering, if the lean mixture could cause a burnt valve (a rather hot day on a highway).

Update: nevermind I'm dumb and messed up valve clearance

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