Hi I have been messing around with 450cc blue top in a zc dohc 1.6 p29 maps on p30 base. I can't get the damn thing to near 0% duty cycle. In open or closed loop.

Checksum + rtp
Boost tools with 1 deg and 120%
Fuel tools
450cc with offset 24
Battery offset dsm 1st gen
Crome pro 1.6.8
Aem a/f using p04 on d14

My a/f reading 14.7 at idle with duty cycle -40%
Any ideas.
Ready to go n/a

I have the fuel pressure set at 43 and at 45 no difference still duty at -40% way off. I tried messing with the battery offset both dsm and oem 240cc every volts.

There has got to be someone out here who played with 450cc?

 

I get the same sort of error when I try to put in my 750cc injectors sometimes. It bugs out and instead of multiplying by .32 it divides by .32. I just restart crome and remake my basemap. Crome is free, that's all I can say. It's probably just a bug.

 

I am running crome pro I have the paid version. Driving the hell out me.

Maybe I am not understanding fuel trim. I thought if I scaled it right I should get near zero short term fuel trim duty cycle? But crome states it's taking -40% to idle at 14.7 afr which means it's taking fuel away?

 

duty cycle has nothing to do with fuel trim. fuel trim is the amount the ecu is compensating fuel delivery while in closed loop according to feedback from the o2 sensor.
duty cycle is the percentage of time that the injector is open vs the percentage of time the injector is closed. this is simply used for making sure you don't use too small or too large of an injector.

and you should never see anything for fuel trims while tuning, because you should not be tuning in closed loop; you should be tuning only in open loop which disables o2 feedback and makes it impossible to set fuel trims.

 

Weird I just noticed my tps voltage not reporting but tps percentage works? Anyone get this from crome 1.6.8 I check and traced the pin d11 I think it's getting voltage .47 4.56v open throttle.

 

I am very curious maybe someone can enlighten me. My oem 240cc 12 ohms no resistor. My 450cc 3ohms with a dsm resistor 6-7ohms if I remember. 2 ohms in theory would made a difference in my mind.

I think I will try to measure what a stock honda resistor value and reset my fuel pressure back to stock instead of 43psi I will put it back to oem 45psi and use the oem 240cc battery offset and just tune the multiplier does this make any sense? I've lost my sanity a week ago. Lol

 

Starting over is a good idea. Just make sure you use the resister box with your injectors if you need to. Don't go getting any mathmatical-crazy ideas.

 

I already answered that one in another of your 5 threads about this too. the resistors/resistorbox should be 10ohms. the ecu is looking for 11-16ohms total on the injector circuit.

 

Any I dead wham a stock resistor value on the Hondas?

 

Thanks moto so by me having total 10 ohms with injectors messing my setup?

 

I don't remember the stock honda injector resister values. But that box may work also.

10 OHM total is below the 11-16 mentioned. It could very well cause your issue. Maybe a new resister box would solve this. Or saturated injectors.

 

stock Honda resistor boxes are 10ohm.
I usually use 10watt 10ohm ceramic resistors from radioshack though, they're perfect.

 

Okay. That answers my theory.

 

Will try to try oem 88-91 honda civic will get back to you guys and tune this bugger. I will also do a complete write up after will attached bin file and logs for the future tuners who has dohc zc not a lot of these laying around anymore too bad they are perfect for turbo 9ish -1 compression ratio. these gave life to b16 vtect

 

If your TPS voltage isn't responding you're probably using the Gold rom QD3 datalog protocol instead of QD2 which is meant for the P30 rom, so change that in your settings.
If that doesn't work, start with a fresh base.

On another note, check the serial on the injectors. If it doesn't say 450, then you got ripped off and those are the 270cc non-turbo injectors. I see that a lot unfortunately.
But if you actually do have a -40% STFT one of those injectors might be stuck open.

Furthermore, most DSM injectors require a pretty high offset even with proper resistance (which you don't have). I typically end up with a 120 to 300 offset.