ok, in all my experiences with 4 b6t engines in the festiva and 2 in the red capri...
this is what ive come up with....
with the stock ecu, turbo and injectors. and a walbro 255 pump. (sorry we defaultly allways put walbro pumps in our turbo cars first thing. sooo...all my experiences fall within having made that mod...) ive pushed 14psi and we cooked the first turbo on the festiva...it looked like an stove reamer, after a bearing went and put the coldside wheel into the coldside...
*festiva engine 1 turbo 2*...we found at the time that reich racing made an ecu for the b6t. so that was the next mod (you see we didnt know rocket or of rocketchips in 2007) then we found the corksport downpipe.. well little known to us were the modifications needed to run the downpipe...one of the modifications needed was to trim out the wastegate hole ...we didnt do that and the car stuck a wastegate in the downpipe (wouldnt open all the way) and our wastegate set at 17psi became 24psi in all high gears...and poof within 3 weeks we lost cylinders #2 all at once....
* festy turbo 2 engine 2* at this point we had the reich ecu, corksport downpipe, hard pipes a blitz bov and 18psi holding strong. the car was a rocket ( no pun intended) on this motor and setup, the 1800lb.festy with brians 200lb ass in it. ran a 12.5 at a stupid 109mph with rubber in the first 3 gears .... by fall our beating on a b6t with over 170,000 miles cought up with us... one night just playin arround with the capri vs the festy.. (not fair my capri was on the dreaded 14psi mark with a stock ecu)
the festy tossed rod # 3 through the back of the block and oilpan...( i got to watch this take place.. about a car lengh behind and to the right of the festiva. it shot flames and sparks over 6 feet behind the car.. and i had a passenger that to this day i swear shit himself...)
*festy engine #3 turbo #3* ...yea engine 3 lasted about 10 minutes after startup and lost a piston at idle heating up (dont buy motors off the 323 performance forum, even if the guy says it has 50,000 miles on it)
*festy engine #4 turbo #3* at this point brian had started his new project, and was looking for an engine to put in the festy just to sell it.. i wasnt thinking, and i sold him the engine i had just harvested from my 88 323gt. and large rods and all went down the road....
*capri xr2 engine 1, and turbo 1, still on turbo 1* ok i had great luck with my first engine..
it lasted and accepted all mods i have done.
so ill just tell ya what did her in...
setup: corksport ecu, stock injectors,walbro pump, corksport downpipe, aftermarket hardpipes and j pipe, 2.5 inch high flow exhaust...
i got greedy and wanted to beat a supercharged fox mustang, so i bumped the psi to 21, and had no wideband to reference...
from what i can gather after tearing down the blown motor. the injector duty cycle tops out at 100% at arround 20 psi on the vj-11 and #1 being the last injector to see fuel leaned out enough to cuase a bad pre ignition scenario, and the engine pushed the piston through this explosion and cooked the right side exhaust valve too...
sooo i built the high compression ...
im currently running the same setup with dsm 450cc injectors, and the na high compression block.
im pushing 18psi everyday. and the afrs are staying at rich levels all the way through the
rpm band in all gears. the car pulls alot harder than the b6t did on 20 the night she blew ...
the new engine has a tightness ,a snappyness it never had on low compression... and a bit more rumble and breakup when you coast in gear up to a redlight. or slowing down it pops and snarls a bit more downshifting... and id say it spools about 250 rpm faster in all situations ( from dig ,, on off throttle,, and power downshifts on the highway...
of all the mods ive done, the one that yields the most gain, is by far the corksport downpipe.. im gonna say 30+ hp gain weather modded to the hilt, or just mildly modded, it will put a big shit eatin grin on your face..
the stock wastegate will not limit the car to 8psi with the cs downpipe, it jumps to 10 no matter if you run a hose to wg from intake with no boost controll it will hold 10psi....