I have a D16Z6 with T3 turbo with 450cc's 255lph pump no missing link and standard fuel pressure reg.

problem is i have set up my S_AFC but i can only get the car to idle if i st the AFC to -25% at 100rpm, surely this aint right, also when at part throttle around 2000-3000 the car is real jerky, whats the prob??? this is driving me crazy

ALSO at idle my autometer A/F ratio gauge shows nothing or at the most 1 red light, surely this is wrong even with the afc set at -25% at idle.

deacs

 

huh strange...did u just put those injectors on? maybe they need to be cleaned...and i wanted to verify, you Aren't using a fmu

 

no not using a FMU just the factory regulator, yeah just fitted the injectors, its really pissing me off, it starts badly now as well, any ideas?? please help!!!!

deacs

 

-25% is what you would expect at idle because the larger injectors take longer to open so for short duration fuel pulses (like at idle) you won't get as much fuel as you would expect based on injector size alone. Bottom line you don't need a large reduction at idle but you need it at higher RPM. Try -20% at idle and -40% everywhere else.

 

ok il give that a try and see how it goes so -20%at 1000 rpm then -40 or -35 all the way up from 2000rpm - 8000rpm right???

deacs

 

Yup, just play with the idle correction in the neighborhood of -20% until it smooths out. Maybe have an intermediate point too like -30% at 3K. IF you want to be really fancy you can step it up from -20 to -40% in -5% per 1K increments or some **** like that.

 

thanks my man, what set up u running on your motor?

 

I'm running an LS/Vtec t3/t4 with DSM 450cc injectors and the AFC hack without the AFC. I designed my own circuit board that does the same thing as the AFC hack.

 

got any info on your home made circuit??? wouldnt mind something like that so i could sell my S-AFC and have some spare cash!!!

I know fuel is cheap in the US but over here it costs about £35 for 220 miles worth

deacs

 

You can see the circuit diagram at http://www.angelfire.com/ab7/diymaplimiter

The first circuit on the site is a MAP limiter for people running an FMU. It takes the place of a missing link.

The second circuit is what I'm running now. It would be what you would want to run to compensate for larger injectors. I sell them built for $20 shipped in the US. I'm not sure what shipping is to the UK. They are only about the size of a pack of matches so it wouldn't be that much. I'm guessing maybe £20 would cover the cost of the board and priority mail to the UK.

 

sounds ideal mate and a good price il get back to you about that one cos im well low on cash at the moment, no doubt u will hear from me soon regarding your circuit.

thanks very much for the help

deacs