goncalohit

Dear all hope you well,
I have an 1993 1.6 miata harness, with an 99 1.8 BP4W engine swap, everything is 1.8, throttle body, injectors, IAC, i deleted the MAF from 1.6 and speeduino CORE 4 is controlling the fuel pump.
The car runs great at idle (still need to fine tune when lights go on), but overall idle is fine, also have used auto tune for the VE table with acceleration enrichment and EGO, car pulls well and im satisfied, AFR seems within range of acceptance.
But my only problem is cranking and startup, i havent tune cold start, but when hot, with almost no enrichments i still need to crank it several times and with accel pedal so it starts apparently with more air, my guess is cranking rich.
but i already downed almost all settings when hot. my goal is to give it better starting, my OEM start with the 1.6 was instant, under a sec, either cold ou warm.
here are some settings im currently working with, car run fines, the problem is cranking / starting up, can you give me some light on how can i make my cranking faster or at least without inputing throttle


i have the 99 1.8 stock injectors

i have tried downed the injector pulsewitdh here

cranking enrichment is pretty low i guess



the table doest seem that smooth i think is related to have the VICS always open (its unplugged)

deezums

iTrader: (3)

Where's speedy's cranking idle pulsewidth curve?

What is injector prime delay, why's it have a big (S)? Are you not ever getting a prime pulse?

Your injector voltage correction seems way too light, too. ~130% at 11V is common, and it gets worse with less voltage. 7V should be something large, like ~250%.

curly

iTrader: (25)

I skimmed your post, but you said you need more air but posted all your fuel settings? Does the speeduino have iac voltage comp?

goncalohit

@deezums The injector prime delay big S is in seconds i guess it says "delay to priming after fuel pump is on, used to wait for fuel line get pressurized correctly", so i guess after the 5 sec of fuel pump it will stil wait 25 sec ? this was on base map maybe its incorrect, i will bump the % on injector voltage correction and see. Thanks
@curly it doesnt have voltage correction on IAC, my iac operationg range is 100-60% with 500hz, cranking duty cycle is at 94%, anything above 96% will cause the engine to spike to 4000RPM at startup

goncalohit

Ok i made some progress i think my problem is that the injectors flow was a bit high i changed from 260 to 240cc, i cant really find the correct settings for the 99 1.8 brown/red injectors some say is 265, some 260, 238... i now have it set to 240cc, redid auto tune for the VE table it lean out the cells its now more greenish, il try cold start tomorrow, but hot start at least is faster

curly

iTrader: (25)

That’s cause you gave all your starting calculations almost 10% more fuel