Doubt about my A/F Ratio

franky2222

i had injenCAI and berk HFC and i was running rich b4 custom tune

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08 G37s 6MT//UPREV//INJEN CAI//BERK HFC//20%//BATOVERLAYS//EIBACH//GTSPEC/

tjaartk

Hi Guys, my Cipher software gives me a voltage output instead of the actual AFR, do you know how to get Cipher to show the AFR instead of the voltage?

Vince@R/T

These are the same results I have found as well. Also with boosted cars they are scaled off a lil further then that actually. For whatever reason on the 370's Nissan switched back to a 4 wire wideband which isn't as accurate as a 5 wire in my experience.

That is probably because UPREV does have your ROM converted yet to set up the A/F Sensor scaling in cipher.


As far as the OP goes, I have seen stock Z's dip down that rich close to redline. If interested we offer E tuning and can get you tuned via E tuning and take care of the air fuel issue.

tjaartk

Hey Vince,

Managed to get the AFR readings back - had to reload Cipher. Still battling with the hot start issues. Car starts perfectly when cold. Idles and runs perfectly. As soon as the water temp goes over 20 degrees C, the car won't start unless I help it with the Accellerator pedal. Apparantly there is a new patch coming out for the ROM editor which gives more tables for the cranking fuel enrichment - Omar at Uprev as reference.

I have the GTM stg 1 SC. Our altitude is 6000 ft.

I see I get a 14% fuel correction at idle to get it to target idle AFR. Looks like it is adding fuel to get it to idle. Not sure what this will mean for cranking enrichment.

Your advice will be appreciated.

This is a very annoying poblem to have - having your car not fire up in the parking lot, with all the M3 drivers laughing at your car...

Vince@R/T

^^^ Sound like you just need some more work on Cranking enrichment. Also there are things you can do with the Electronic throttle tables to open the throttle blade slightly during cranking to help with starting. As far as your fuel trims being at "#114" it means the ECU is adding 14% fuel at idle and needs to be trimmed in a lil better. I'm sure Sam can send you some updated tuned ROMs to help your issues.

tjaartk

Thanks Vince, where woulkd one access the throttle blade settings at cranking? Is this available in the ROM editor?

Vince@R/T

They are in the ETC Table you can datalog it while cranking and see where the cells are and raise the values in that area that will crack the throttle for you while you are cranking to help with hot start. Also UPREV just came out with some cranking enrichment table that came be modified as well.