that's actually kind of a funny question. Since the EU is a piggyback you're working off the factory ecu. A zeroed out EU is pretty much your base map. Tune from there!

It's not like this is an AEM EMS and you need a base map to get the car started up.

 

sorry I'm an r-tard..I'm used to my cobb accessport reflash for my sti....not a piggyback type system.....but the car get tuned today lets see what she does....


Matt

 

Has anyone tuned a boosted S2k with large injectors? How do you get away the closed-loop issue? (the ECU leaning out the AF to stoich under low throttle openings but still in boost)

 

it requires some different wiring on the harness to allow you to trick the stock ECU into open loop sooner.

Not that hard to figure out however don

 

[QUOTE=MugenRioS2k,Dec 30 2007, 06:02 PM] it requires some different wiring on the harness to allow you to trick the stock ECU into open loop sooner.

Not that hard to figure out however don

 

Did not know if you wanted that cat out of the bag

 

I think there is an external adaptor sold by Greddy to alter the AF signal going to the ECU. WHen enabled (auxiliary map), it sends a stoich signal to the ECU (0.5v) so you can play with whatever AF ratios you want through the ULT.

 

Excellent Post guys, I'm leaning towards getting the ultimate really soon, but could some confirm the request above?

 

We have done over 100 installs and have never used this feature . Your car will stay at Stoich when in closed loop via the factory computer , hense why you need to read the factory fuel trims when tuning so you dont upset this balance . Then we tune the rest with a wide band on the dyno in open loop .. no need for O2 feed back .

At least we have found no need for it

 

Have you guys tuned boosted applications? How was the partial throttle tuning done on that one? or did you leave the stock ecu to handle that? thanks