Just recently replaced my Fcon V with a Haltech and I'm having some trouble getting everything set up.

I've got the engine running and idling, but it will only idle at 8.0:1 AFR and richer. If I attempt to lean it out to the point where it will accurately register on the wideband display, the engine stumbles and dies. Watching the APP and TPS logs don't show anything odd with the factory ECU's control of the idle speed. I know that this is not a sensor inaccuracy issue as the car is emitting a white cloud of gas from the tailpipe when idling. Definitely rich.

I have not tried actually driving it yet as I don't want to with the engine this rich and I have no reason to believe it's going to lean out off idle. The car is fitted with 450cc injectors as far as I know, so I don't think I'll be able to use copy-through fueling even for tuning the vacuum areas of the map. I am familliar with tuning Megasquirts with much much larger injectors than these, but I am new to Haltechs and Zs so I may just be missing something simple. Does anyone have any idea why I can't idle at anywhere near normal AFRs?

Thanks

 

Start with injector latencies

https://my350z.com/forum/forced-indu...injectors.html

May not have your exact injector, but at least you can get in the ballpark.

https://my350z.com/forum/9103747-post49.html

Check out that post. Sure you dont have 650cc injectors? Never heard of 450cc.

 

I honestly have no idea what I have. I bought the car with a folder full of receipts indicating that "450cc injectors installed per customer request" with no indication of brand or model number. I'm about to begin taking the plenum off to figure out what's actually installed on there. Thanks for the help and the link, I'll let you know what I find in there.

 

Ok, everythings taken apart. They are Denso top feeds. Three numbers are on the side in no particular order: 231, 3500, 22. Looking to see what these might be now. They certainly don't look to be aftermarket, so either theyre actually stock (doubtful with the richness) or theyre OEM for something.

 

I should add that they are High impedance. Still cant find anything on the internet. Upon closer inspection, the only number common to all of them is 3500. I also see that someone has scratched a number into them. I wonder if that may be the lb/hr rating, but again it's different on all 6.

 

They might be DW injectors. They modify oem injectors for higher flow rates and resell them.

http://z1auto.com/prodmore.asp?model...ne&prodid=3445

 

That looks likely. Let me see if the scratched in numbers are at least close to each other. One was 51, one was 49. I'll check the rest.

 

59-44-8-nothing-nothing-nothing. Sweet.

 

Looking thru the receipts im finding conflicting info. I'll call the seller and see if he's willing to shed some light on this.

 

If this isnt your daily you could send them for cleaning and flow testing. That way you would know for sure.

Do you know if the former owner was a member here with a possible build thread?

 

No answer from the seller. Comparing timestamps on receipts, it appears that he went in to the shop, had 480s installed, did a dyno run, had a new invoice printed for the install of 600cc injectors, and did another dyno run. I'll try 600s in the Haltech.

 

Sending them in might not be a bad idea. There used to be a place local to me, I wonder if they're still around.

 

Make sure you have the Haltech set to high impedence injectors in the main setup. Regardless of what size those injectors are (you could more easily contact DW and see if they can help you identify with the markings), you should be able to tune for it by decreasing fuel at idle. Set all timing at low load to "C" for copy through timing (stock ECU will manage under high vacuum/low load). Car should not stumble until you get to 17:1 AFR so something else is going on... Make sure all correction tables are set to 0 and start with the fuel base table.

 

I do know its on High impedance right now. The issue was if I tried leaning it at all it would die nearly immediately. I'm putting the plenum back together now and I'll set the Haltech up for 600s to test. All corrections are currently off

 

You should also update the latencies now that you have a better idea of what they are.

 

Still no luck changing settings around. I've currently got it set to 600cc injectors and adjusted the latency both ways and it'll still run extremely rich or not at all. Not sure where to go from here, but I'll keep messing with it.

 

Ok. Some progress finally. I tried loading your tune Chris, and after changing the injector size and nothing else, the car will idle normally. Still rich, but nothing like it was. What's most interesting is that there isn't much different between the setup on both, apart from internal vs external MAPs. I think it's at least good enough now to work with. I need to do a free air calibration of my wideband as it no longer wants to register anything. After that I might be able to begin driving.

 

Well, that wideband isn't really working anymore. It won't even successfully complete a free-air calibration. Just ordered an AEM UEGO to replace it and the HKS AF/Knock Amp. Guess this will be on hold for a few days..

 

Good to hear youre making some progress. Sucks to hear about the wideband.

I did notice 1 other difference. Your map was using the actual maf input to send to the oem ecu where as mine was using a table.

 

I saw that as well. What purpose does that serve when doing map based tuning? I can only guess its to prevent check engine lights when overwhelming the stock maf but again I might be misunderstanding it. New sensor should be here Wednesday hopefully.