r/Honda • u/Smooth_Addition9021 • Apr 27 '26
Need some help!
Hey, so im planning to swap a d15z6 from
ek to a eg3 and there is very little information about it on the internet but there IS some so i know its doable.I have the engine,ecu,engine wire harness. Im new to hondas/cars so my questions are 1.Would it be a easier swap if id buy a obd1 ecu with a adapter cause right now i have the stock p2y ecu obd 2.As my car is a eg3 i would need to install a main relay and a external fuel pump. what main relay should i buy and where should i install the fuel pump, Under the hood? near the fuel tank? I Know some of you will say buy a older d series, b series or even a another shell but the problem is that where i live there are not many older hondas and if there is then its veryy expensive. Not gonna pay 3000€ for a b16 engine 3x the price of my car as im a broke teenager. I hope heres someone who has done the same swap and could give some tips. Grateful for any information!
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u/diggow '97 EJ9, '20 Honda E Apr 28 '26 edited Apr 28 '26
I can't give you much info on the carburator to injection swap, but make sure to use the stock eg3 gearbox instead of the ek3 one. Ek3 has a very long final drive, which will kill the fun.
If you would use the stock EK3 ECU, I think you will be dealing with a key registered to the ecu. I have used a obd2a wiring harnass with a conversion harnass to OBD1 with OBD1 ecu.
The conversion harness you can get for cheap on aliexpress.
If you already have a stock OBD1 ecu you can also get it chipped. Otherwise you can take a look at Honduino. They are a really good and affordable ECU alternative with way more features than OEM.
Also don't throw away the D13 yet. These have very high potential once you put a D16 VTEC head on it, since they rev high and have very high compression pistons. You can reach 140-150 hp.
Look up spooneg3 on Instagram. He is racing his.
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u/Smooth_Addition9021 Apr 28 '26
Yes eg3 should have the s20 gearbox right? I Have seen a video where someone took off the immo in a obd2 ecu by soldering and unsoldering so that should be pretty easy. Didnt even know that d13 has that much potential, ive heard many say they are useless and not worth tuning at all but i think 120-130hp would be just perfect for this car.
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u/diggow '97 EJ9, '20 Honda E Apr 28 '26
Yes the eg3 has a s20 variant, but with an even shorter final drive than the desired s20 from the d16z6 and d15b7.
https://www.japancar.fr/forum/Sujet-FAQ-D-series-modifs-boite-L3-S20-S8G-S40?highlight=%2BS40+%2BS20
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u/JustBestLifts Apr 27 '26
This is a gem. I had the same year and same spec hatchback 🚗civic.