Water Methanol without a tune (brainstorm)
 

Here is a unique scenario.

I got an 86 from Japan Auction, it came with HKS SC V2. I am informed the car was tuned by HKS Japan for 91 octane.

Now the issue.
I live in a country where only available, 87 octane or sometimes lower (i know its really bad). I cant seem to tune my car as its locked my HKS, now i can feel my engine struggling through out the whole rev range. Most of my friends driving evos sti's and JZ's are using water methanol kits to keep knocks away.

Now, the question is (in the interest of saving my engine from detonation) what will happen if i install a water methanol kit, without tuning for it.

Will it improve my performance?
Will it fix my IAM?

Don’t think just adding a methanol kit will help. You’ll need to get it tuned. I’m pretty sure timing is adjusted at higher boost/when methanol is injected to account for the detonation or lack there of. I use a methanol kit and it only actually pushed in methanol at around 10+ pounds of boost, so setting the pump to a certain percentage on with throttle instead of boost seems dangerous for the engine. If I were you I’d probably just get it tuned from a reputable tuner in your area and if you wanted to add a methanol kit. Ie, get it tuned without methanol at 87 octane or add the kit and get it tuned for the same with methanol.


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Do you have access to boostane or torco? You can raise your octane with that.

Water/methanol injection would theoretically work but typically you have it activated based on boost pressure so either you wouldn’t be spraying it during normal DDing or if you managed to get it to spray say based on throttle you would spray constantly probably spraying too much at low load and also run through your tank so fast. Also so many variables to consider like methanol percentage and cc/flow rate. Not recommended without a tune.

Why is your ecu locked? You could also consider buying a new ECU if it’s impossible for you to unlock and use yours. Can you atleast datalog and look at AFR IAM and knock?

You probably just need to buy an ecutek, dongle, cable and license and get someone to tune it.

Water injection only should work when the engine is in closed loop. In open loop, you might run lean. If you add methanol, you'd have to re-map. A good tuner could figure out from logs when to inject methanol and when not to, but you'd probably go through a lot of it.

Water meth cannot be used as a straight up knock preventative. As it is something that is being added to the mixture, it will make you run rich as far as the car sees af/r.

Find a way to get it tuned, I promise it's a lot cheaper than blowing your engine

The tune is locked, however the ECU is not. Get a tuner to write over the HKS tune. FYI the new tuner will lock his tune also.

Can’t find a local tuner. Contact Delicious Tuning, they can remote tune. You will just have to buy the hardware.