Water or Water/Methanol Injection DIY

[06YarisRS]

Having second thoughts

I found information about the design of the 2ZR intake and I'm getting a little concerned at pooling of water might become an issue. No matter how fine the mist from the nozzles is (even on professional water/methanol injection systems), there is some dripping of fluid when the spray hits the throttle body/charge pipes. I'm afraid that it will slowly fill the manifold, then suck in enough water to hydrolock the engine.



https://toyota-club.net/files/faq/19...engine_eng.htm

EDIT: I had a lengthy discussion with my tuner today. He feels strongly that the extreme airflow within the manifold will result in virtually all of the mist/water making it to the combustion chambers leaving trace amounts in the manifold. He said that it will be constantly purged. Apparently, many small 4 cylinder engines use a very similar manifold and there are lots of these cars running around with injection kits. He did however try very hard to convince me that I should run a water/methanol mix. As pointed out by Sam, my pump is not rated for combustible liquids. The general consensus online is that anything under 50% methanol will not burn. However, I have read that windshield washer fluid will burn, albeit with an invisible flame - sounds scary. I'll do some further research and may settle on a mix with a lower percentage of methanol. Bonus is, is that a local business owner has drums of methanol and he'll see me it for $5.00 a gallon. Lastly, I may scrap the intercooler mister. My tuner does not feel that the excess moisture that ends up in the engine bay is worth - in his belief - the almost immeasurable temp drop delivered by an intercooler sprayer. He says I should see great benefits (greatly increased effective octane rating) with the direct pre-throttle body injection. So, I am going forth with the injection. I recently inherited a sum of 'hobby' money. Should something happen to my engine, I may look into picking up another 2ZR, build the bottom end (our buy a pre-built from MWR) and start looking at either a build for my 4-speed auto or a 6-speed swap and LSD. I know for the money, I could buy a faster used performance car, but there is something inherent about this car that prevents me from fretting over dumping 'too much' money into it. I have absolutely zero buyer's remorse when it comes to my baby.

[ern-diz]

Originally Posted by 06YarisRS

[B]I know for the money, I could buy a faster used performance car, but there is something inherent about this car that prevents me from fretting over dumping 'too much' money into it. I have absolutely zero buyer's remorse when it comes to my baby.

She's a thing of beauty. You've done amazing with it

[06YarisRS]

Originally Posted by ern-diz

She's a thing of beauty. You've done amazing with it

Thanks very much, Ernie! I don't know why it took me so many years to acquire a Yaris. I love everything about this little car.