Hi I have a 99 civic coupe with a 93 b18. I am looking to make around 350-400hp. I am a senior in highschool and am looking for the best way to reach my goal without spending to much money but its not like a looking for the cheap and non reliable way to do this. I currently have the head off and I'm not for sure If I should go for a forged bottom end and top end or something else. I don't know what size injectors I should use or fuel pump and if I need to buy forged internals for the top and bottom end I don't know what parts I need. I will be turboing this car. This is my first car build amd I appreciate the help ahead of time. I'm used to trucks.

 

What type of fuel do you plan on using? That decision will drive your fuel system needs. If running E85 you'll need to deliver a higher volume of fuel per HP than E10. I would probably just go ahead and plan to use a (genuine) Walbro 450 in-tank pump in conjunction with a relay and large gauge wiring.

I know some people have made 400 whp on stock bottom end B18C's...not sure about B18B's. For peace of mind you could do a set of forged H-beam rods and forged pistons. Regardless of whether you stay with cast pistons or forged, make sure you gap the rings appropriately. That's how I killed my first stock bottom end turbo build - I didn't touch the rings and I cracked the ring lands.

I would not spend any money (initially) on the top end other than maybe a set of springs, depending on how much boost you plan to run to reach your goal. Your money can be better spent elsewhere at first, and upgrading top end parts (other than valves) does not require pulling the engine apart, so it's easy to do down the road.

Make sure your head and block decks are flat while you've got it apart. If buying new pistons, wait to buy them until after you have the bores inspected - you may need to bore oversize. Check your oil pump clearances and replace if necessary. Replace all seals/gaskets/hoses, and if disassembled, it's a good idea to throw in fresh bearings. Don't forget to budget for a clutch, engine management, and dyno tuning. For turbo kits, I highly recommend the Go-Autoworks journal bearing "street kit" and upgrade to the Garrett 50 trim. It's high quality parts that fit/work together very well and costs under $2,500.