I'm about ready to install my UTEC. SAFC has been removed from the car and the patch harness has been repaired.

My setup is Buschur Stage 4 with 660 injectors and a Dynoflash that accounts for all mods, INCLUDING THE INJECTORS.

I'd like to use Open Loop Fueling, but I'm a little confused on how to set it up given that my ECU is already scaled for my 660 injectors. My question really comes down to what happens in OLF at low TPS -- is the car running off the ECU's fueling (piggyback mode), or is it running off of a UTEC background map (standalone mode)?

If the UTEC uses ECU fueling at low TPS when in OLF mode, then I think I should set "Stock Injector Size" and "Modified Injector Size" both to 550, and then manually scale (add fuel) to the high TPS OLF fuel map throughout. At low TPS the Dynoflash would take care of scaling.

However, if the UTEC uses its own background map at low TPS, then my Dynoflash wouldn't scale anything and I should set "Stock Injector Size" to 550 and tweak "Modified Injector Size" upward until my fuel trims are happy at low TPS (presumably when MIS is close to 660 -- though I understand the need to increase this constant in baby steps to avoid leaning out the car too much accidentally).

Thanks!
Rich

 

Rich

FWIW I have SARD 700 cc injectors. I am currently running my mod/stock ratio of 550/550. I use the fuel map to actually 'scale' the injectors. I have no problems when in CLF so I would recommend doing the same. Just adjust your fuel map for the actual 'scaling'. Use 550/550 and you should be ok.

As for the scaling feature, I don't actually know if make an adjustmet (550/580 for example) that it makes a difference. My understanding, which could be wrong, but doesn't effect me either way, is that the scaling only works when in actual OLF. So in essence, the scaling feature wouldn't work for you anyway. Understand? I could be wrong though.

 

Basically what SQPLancer said is correct, however you can scale the MODIFIED INJECTOR SIZE setting to scale the base OLF map so its closer and doesnt require as much correction, but you've leave the STOCK INJECTOR SIZE setting at 550 since the MAF scale is already set correctly for it... However you would gradually set the modified injector size value, don't set it for the injector size your using, but start with it much less, then creep up on it until you get into an AFR thats close to where you want to be, then tune the car from there.

 

Thanks, but it is SG Plancer.....

 

Dyslexics untie!

Sure make fun of the dyslexic guy.. You guys are lucky I can get a complete thought together lately..

 

Thanks. One other question -- when using OLF, do the parameters that you set in the UTEC for retarding timing and adding fuel when temps rise supercede the stock ECU's fuel enrichment maps for higher coolant temps?

 

In OLF, you are dependent on the UTEC for any enrichment if you choose to use it.. at closed loop and part throttle, the ECU will continue to run as normal.. Therefore its important that if you live in a hot climate, that you actually set these parameters if you need them (Very hot weather will increase the chance of detonation) so adding a few percent of fuel and removing a bit of timing is beneficial, but you have to determine at what point its necessary..

The UTEC is a powerful tool, but you do have to use the tools available to you..