ATS Rom tune with 550's!!
Maybe it CAN be done. Here is a dyno graph of my tuning, the stuff below ~3300 rpm is closed loop. The wide band was in the downpipe and the stock O2 was hanging in open air, so the ECU thought he car was really lean and was dumping fuel. Once it popped into open loop it did really well as you can see.




Needless to say the car is fast.

Here are the mods:
JDM stock 93 motor
Greddy IC
Profec EO-1
Spec Stage 2 clutch
intake
KO 2.5" downpipe
no exhaust (customer is installing a 3" TKO tomorrow, all he had now was the stock b-pipe and a cruddy JDM muffler, so to tune it simulating a free flowing exhaust like the TKO we pulled it off at the downpipe)
ATS CT27 50 trim
ATS Rom tune
Walbro fuel pump
Gen 3 540cc injectors
22 psi (yes that is alot)
50/50 race gas mix

The pump gas power was really nice too 263 rwhp at 1.05 bar!
Various powwer/boost:
1 bar = 255 rwhp
1.05 bar = 263 rwhp
1.4 bar = 295 rwhp
1.5 bar = 310 rwhp, This pull was 4th gear, all others were 3rd gear. There was a 1 psi spike in the mid-range on this pull.

At this point this option is not available via mail order. Let me get a few under my belt and make sure this was not an anomolie (spelling?) and I'll start offering them.

Aaron