14bcivicsi

i have a 92 civic si with a stock D16Z6 and i installed a 14b with 450s and a small front mount with 2-2 1/2" charge pipes on the hot side and 2 1/2-3" on the cold side, I am running a crome basemap and it runs really good. it starts spooling at 3500rpm but doesnt hit 10lbs untill 5000rpm. I thought that a 14b is supposed to have full boost real low, was wondering if i changed to 2" pipes on the hot side and 2 1/4 on the cold side it would make it hit full boost quicker or if I just need a tune. also i have no boost leaks at all thanks for any input

crx304

14B's like to crack around the wastegate hole in the housing causing the turbo to Lag. take the turbo off and look inside the turbine inlet.

Econo-Box

how big is your exhaust?

14bcivicsi

there are two hairline cracks by the flapper like every other 14b and my exhaust is 2 1/2" all mandrel bent from the turbo back

2tonehatch

i get 8 psi around 2500 if i smash on it. this is also on a stock z6. i'd check for leaks in the charge piping or cracks around the wastegate hole

lilpooh21186

with basemap i didnt spool till 4000 hit full boost till almost 6000 after my tune i spool by 3000 full boost at 4500

14bcivicsi

should i try to retard the ignition a lil bit, if so by how much?

Slo_crx1

Try unhooking the wastegate and replacing it with a carb spring pulled decently tight to see if it still does it. It could be a weak wastegate spring and the exhaust pressure just might be pushing the flapper open too far. It shouldn't take anywhere near that long to make 10psi out of that little guy, I'd say 3400rpm at the latest.

J-MAN

^^ good call, i had that happen before where the wastegate wasn't closed all the way so i had to adjust it tighter. problem solved.

14bcivicsi

thanks for the info, im gonna buy another wastegate actuator and try and see if that works, when i bought the turbo the wastegate did look a lil messed up