Howdy --

I have a 1991 1.6L with an MS2PNP, 700cc Bosch injectors that came with my Kraken 2554R kit. I've got it running pretty well in every circumstance except the first cold start of the day, which cranks about 2-3 times as long as you'd expect and then sort of splutters slowly to life. Every other start of the day works good, even if I shut it down right away and restart it. Would love to hear advice on this, or if anyone has a 1.6 running large injectors and thinks their cold-start tune is excellent I'd love to see enrichment curves and priming, etc.

EDIT: I've converted to sequential injection and R8 COPs.

Thanks!

 

Your cranking/priming pulse is way too low. I included a screenshot of my cranking/priming pulse settings. To be fair your priming pulse settings may need to be lower than mine due to the larger injectors (not certain on this), however cranking pulse is a % adder so it should still work. My settings certainly aren't perfect, but should give you a better starting point.
Edit: whilst looking at other threads unrelated to this I saw another much smarter member talk about how he would expect cranking pulse to be around 150 so it seems I'm out of my element when it comes to larger injectors... probably ignore my advice lol. Leaving this here though to cement my mistakes on the internet forever.

 

That's a pretty terrible tune, a lot of the starting settings are zero'd out above ~120* coolant. Lots of other issues all over, not sure that's the map you want to start with. Has it been "tuned" at all?

 

Cold start settings can be difficult to tune well. You really only have 1 opportunity per day to log it, then it's 12-24 hours before the same conditions truly exist again. I know a local tuner shop that invested in a refrigerated shipping container to be able to control temperatures in order to tune E85 in crazy cold temps. So that's a thing.

 

I must say, that is extremely cool . Thankfully I've never had any cold start issues, other than the fact it takes like 1 second longer to start than my warm starts, which I'm 1000% fine with.

 

At coolant temps anywhere over ambient it starts great with no additional fuel, that’s why I’ve set it up that way. Warmed up, it’s tuned on the rich side for safety, so that probably reduces its need for enrichment a bit. (11.5ish AFRs under boost, idles about 13).

What priming and enrichment settings would you suggest for the first cold start on my setup? It usually lives in a climate controlled garage, so about 70 degrees is the usual first-start temp.

 

If you don't need any additional fuel when starting, it sorta tells me these injectors run a bit rich when cold. I would start by taking your warm up enrichment curve, cranking pulse %, afterstart enrichment curve, and afterstart enrichment percentage, and multiplying the ~70* range by 0.8. Take a log in the morning on your current settings, then take a log with the above changes the next day. Compare the start time and idle of each, see if it's improved. Sometimes multiple logs are required (1/day) to verify changes. Again, if you do this at 7am and 7pm, you can probably sneak in 2 "cold" starts per day, but that depends on your location. If you're in Arizona and at 7pm it's still 100* in the garage, that probably won't work. It's great to have oil temp, so you can compare water, oil, and air temp, and make sure they're all around ambient. Once you start the car, make sure all post-crank and warm up enrichments have run their course, so it's not leaving any extra fuel in the intake manifold or cylinder for the next start.

 

I have read people have nothing but problems with the Kraken injectors, especially cold start/idle.