Well this took a few months longer than I anticipated...
So the story goes: I bought the Beta 2 head, spent a long ass time working on it. Then found a microscopic crack between the valve seats.
Sent the head to a machinist. He pulled out two of the valve seats, welded the crack, pressed in new valve seats. Did a valve job and shimmed the lifters. It took a LONG time to get the head back. I decided to replace the bearings and piston rings while it was apart. Then I found an excellent deal on new OEM 1.8 liter pistons. $10 each...
Well I FINALLY put the car back together, and... I love driving it, if you have the means I highly recommend picking one up.
The 1.8 pistons alone take it from the stock 10.3:1 compression to 11.0:1, plus the head was decked 40 thousandths. So the compression is around 12.0:1 it seems to run fine on 93 octane. I also used the stiffer 4g63t valve springs.
The car DEFINITELY pulls harder. The next dyno day is in two weeks. I would be shocked if the gains are less than 10whp. I'm going to guess at least mid to high 140's.
It's not a lot of power but it helps if you compare the power to weight ratio to an Elantra XD.
132whp J2 (2300lbs) is equal to a 166whp XD (2900lbs)
145whp J2 (2300lbs) is equal to a 183whp XD (2900lbs)
Plus my car has much shorter gearing which helps a lot.
I set the SAFC to + 20% from 3500-5500 and + 15% from 6000-7000 for a base tune and then gradually lean it out from there. It actually ran low 13's (afr) until 6000, then mid 12's. So the engine definitely breathes better now. These engines seems happiest at mid to high 12's, so I will have to add more fuel below 6,000
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