question for the tuning gurus

[NecroWolf]

so i've made the switch to xfi now. i've been studying the bins from the various chips aviable that are close to the rest of my build. alot of the data tables look simliar. now i'm pretty sure i can pretty well start by semi duplicating the timing curve from the bins to my xfi setup, but my big question is about the fuel tables. the fast software lets me set a base injector flow rate. am i coreect that the stock computer is either setup only for the stock 31lb injectors or that the fuel tables are just a reference point for fuel flow? which either being true, i'll pretty much have to uild my own fuel tables or could i use a stock type bin to get a baseline? i see a startup file in my xfi software that should be close but it has an extreme spark table compared to any sy/ty bin i've looked at so i'm guessing it's a race fuel tune.

 

[TYTILIDIE]

Re: question for the tuning gurus

Ok I am not a guru here but can tell you that the table I think you are going to look at is Base Pulse Constant-vs-Desired EGR (F28) That table controls fuel on a wide scale. I know when I have tried different bins in my Ty I always notice the differences in that table compared to the general VE #'s that have been entered in to the main fuel table. If you had a bin loaded, and changed the F28 table, the entire VE table would change as well. I could be wrong but I think, this would be a fair place to start when adding bigger injectors. Not a solution for sure, just a start maybe. I am not sure how all that compares to your xfi but I think that is what you are asking for.

 

[10secTy]

Re: question for the tuning gurus

Just grab any base file that looks some what close to yours. Make sure the injector constant is correct. Get it started then start making adjustments you will have to make your own VE map. You will not be able to use anything from the bin files in fueling to help.

The timing will give you a idea where you need to be.

Nolan

 

[NecroWolf]

Re: question for the tuning gurus

thats what i was figuring Nolan. i am curious about if the stock ecm has an injector constant or how it references fuel tables to injector sizing.

 

[NecroWolf]

Re: question for the tuning gurus

so if i was dialing in for e85 i could probably use one of the more aggressive timing tables?

 

[turbodig]

Re: question for the tuning gurus

so if i was dialing in for e85 i could probably use one of the more aggressive timing tables?

I wouldn't start there, personally, but you will likely end up there.
Start with one of the lower ones, and work your way up. The truck will tell you what it likes.

 

[NecroWolf]

Re: question for the tuning gurus

thats what i figured on the timing tables. as far as my truck telling me what it likes, i think it has and it's me that it doesn't like

 

[NecroWolf]

Re: question for the tuning gurus

instead of a new thread i'll just keep this active. i'm starting my spark tables and noticed the stock tables are in 200 rpm increments untill 1600 then are in 400 rpm increments. on my fast software, i can adjust the rpm on my spark table, should i mimic the stock resolution or move it or just seperate it evenly?

 

[NecroWolf]

Re: question for the tuning gurus

and another question. while looking at the spark advance vs rpm vs map table i see the table in code 59 goes to 288kpa or 41 psi and on my fast table it goes to 312kpa or 45 psi. would it be worthwhile to set it to 30 psi or 210kpa to increase my spark table resolution?

 

[turbodig]

Re: question for the tuning gurus

instead of a new thread i'll just keep this active. i'm starting my spark tables and noticed the stock tables are in 200 rpm increments untill 1600 then are in 400 rpm increments. on my fast software, i can adjust the rpm on my spark table, should i mimic the stock resolution or move it or just seperate it evenly?

Leave it alone... that's more than enough resolution.

 

[turbodig]

Re: question for the tuning gurus

and another question. while looking at the spark advance vs rpm vs map table i see the table in code 59 goes to 288kpa or 41 psi and on my fast table it goes to 312kpa or 45 psi. would it be worthwhile to set it to 30 psi or 210kpa to increase my spark table resolution?

Again, leave it alone... more than enough resolution as it is.

Dial your tune in first... if you have areas where it seems you'd need a different value in between, *then* change table geometry.

Initially, simple is good. The less messing with it, the better.

 

[NecroWolf]

Re: question for the tuning gurus

thats what i starting thinkin last night after i posted i could adjust it if i had a really troublesome area but i just wanted to confirm it