so I just got in my 1680cc injectors from KGparts.

My friend and i are both running single turbos. He is running 1600cc injectors i think...and mine are 1680.

We have a datalogit

So i wanted to boost my car at 10psi since that is what the wastegate spring is at. But i do not have maps for the injectors. So would it be smarter for us to find maps online for 1680 cc injectors single. Or could we just load the maps from his powerfc, which is tuned very safe afrs.

now does it matter if his are for 1600cc and mine are for 1680cc. I know theres a difference but not by much so thats why i ask. We could just change the settings in his to 1680cc but i dont think that makes a difference.

What im guessing will happen is my car will run super rich on boost since my injectors are bigger by a little. better rich then lean right? i should run some premix.

any thots?

i really need a wideband =\ ill get that in the spring time

 

Just load his maps, if you are sure there is a size difference between your two setups you can change the injector size to 1680 and you are good, if you keep them at 1600 then yes you will be a bit richer just as you thought. Still important to run it with a wideband and log some runs to make sure that your AFRs and knock are ok ... lots of variables that are not constant between even similar modded cars.

I've also seen large singles on street port motors that needed quite a bit of retard at low boost levels to control knock, be sure your buddy's map was tuned at the boost levels you plan to run or you might want to add some fuel to his map for safety untill you get your setup tuned.

 

Ok thanks.


really well his car is tuned for about 13psi on a bigger single, and mine is 10 psi on a smaller single. So would i still ahve to worry about that retarding? Or should i be still safe only really rich?

 

All I meant to say was if his PFC was not tuned at the p-row that you will be boosting at you have no idea if it's conservative unless you are knowledgable enough to interpret the map and make your own conclusions. Secondly, your fuel pressure and many other variables affect AFR and knock sensitivity. I highly recommend that you start a bit conservative and datalog it then dial it in slowly.

Ask him what boost levels were tuned on his PFC maps and run within that window. I suspect they did no ignition re-mapping so you probably have stock PFC timing. Datalogging is the way to be sure and if you have a Datalogit and a laptop there is no excuse not to.

 

Ya he has the datalogit and laptop. The only problem is, his wideband is wired into his car so we cant remove it easily.

Hmm i was thinkin my fuel pressure should be around 45 psi at idle? should that be right? or should i run off whatever he does?

Last time i talked to him he said he was running 13-14 psi right now and his maps are tuned very conservatively. I just thot it would be safe to run his maps (i think he got them online and tuned them a little to fit his car) since his turbo flows alot more than mine. Do you think we should start with a map from the datalogit forums with someone with a similiar setup thats maybe running a little more boost then me on a single, that way i have some headroom for spiking just to be safe? I just need something i could run 10lbs on. I dont plan on going over that til i can actually have a wideband o2 in the car, boost controller, and bigger turbo.

or start with his and see how they do? I dont think there should be any lean spots do you? Do you think theres a good chance his ignition has been remapped to run his setup. Would it be really bad to run stock PFC timing...i dont think his would be, cause his car runs great...please explain somemore!

 

10psi is not a lot of boost and should be pretty foregiving. Your call.

 

hmm...i think ill be okay, because its no more then stock boost levels, although the flow is totally different now. but now with 1680cc running the maps of someone at 13-14 psi on a turbo thats probably bigger then my ebay ****, i think ill be safe at 10 psi. Its when i go over 1 bar and to like 18-20 psi that I WILL buy a wideband to keep the in the car and get it tuned on the dyno


i just wanna get maps loaded so i could enjoy my car a little. even at 10psi. i could probably still walk some cars haha.