1st Log on 750's SAFC tune

[joosdawg]

ok finally got a good log done with the things i needed . First things first, I am still on the stock sidemount because its been way to cold to install my "ebay" core and i was messing with the boost controller and just decided to leave it at what it was when i was trying to dial in 16psi it ended up being abour 19-20psi insted but i didnt feel like getting out of the car again in subzero weather.(i know stupid thing to do and why post then right?) Anyway i think because of that im have some knock issues up top. Here take a look and give some feedback on what yall think...

RPM O2v KNCK TIMA
2281 0.72V 0 23.00º
2343 0.58V 0 24.00º
2375 0.66V 0 24.00º
2468 0.49V 0 22.00º
2531 0.58V 0 21.00º
2562 0.72V 0 19.00º
2656 0.70V 0 18.00º
2718 0.72V 0 16.00º
2781 0.80V 0 16.00º
2875 0.84V 0 15.00º
2968 0.84V 0 14.00º
3062 0.86V 0 15.00º
3156 0.86V 0 14.00º
3250 0.86V 0 14.00º
3343 0.88V 0 15.00º
3468 0.88V 7 15.00º
3562 0.88V 7 12.00º
3718 0.88V 6 12.00º
3750 0.86V 6 13.00º
3937 0.88V 6 14.00º
4062 0.88V 6 15.00º
4218 0.88V 5 15.00º
4343 0.88V 5 15.00º
4437 0.88V 5 15.00º
4593 0.88V 4 15.00º
4593 0.88V 4 15.00º
4750 0.88V 4 15.00º
4781 0.88V 3 16.00º
5093 0.88V 3 17.00º
5000 0.88V 3 17.00º
5156 0.88V 2 17.00º
5281 0.88V 3 19.00º
5343 0.88V 10 19.00º
5468 0.88V 15 17.00º
5500 0.88V 15 16.00º
5843 0.88V 15 16.00º
5781 0.88V 15 16.00º
5812 0.88V 14 16.00º
6062 0.88V 21 17.00º
5968 0.88V 21 15.00º
6093 0.88V 21 15.00º
6156 0.88V 20 14.00º
6281 0.88V 21 16.00º
6468 0.88V 21 14.00º
6281 0.88V 21 14.00º
6468 0.86V 20 12.00º
6437 0.86V 20 13.00º

Any help on SAFC settings would be great even though i think im gonna have to redo this all tomorrow morning with it set at 15psi insted of being so high(20). Either way, anyone know what some good settings are to make my idle good when its a first morning start because man does mine suck! Also whats a good point for low and high throttle cutoff, i have mine set at LOW=30% and high=80%. Im also going to assume that my idle is adjusted with the 1000RPM slot in LO-throttle on the SAFC? This is my first time using these two things just today so any help from here on out would be great! thanks

-Ryan

PS. Not sure if you need to know mods but there in my vehicle profile

 

[Talesin]

Definite knock issues. My instinct would be to dial it down to 16 and pull again.

Failing that, pull again and log your injector duty cycle. With 750s you shouldn't be overrunning, but you want to make sure. Only thing I can recommend is richening the top end a bit to try to calm it down... remember, you're shooting for a zero knock count. Anything in excess of 10, I'd pull over right then and there to fix it... but then, I'm paranoid about joining the piston altitude contest.

Has your AFPR come in yet? Good idea to get that on so you have a good fuel baseline, before you start tuning. The stock 1G FPR will pretty easily be overrun to hell and back by a Walbro 255 HP, and once you get the AFPR on and turn down the pressure, the current SAFC settings will send you headlong into super-lean, as it's compensating for the abnormally high pressure (aka: higher injector flow).

Also, might be a silly question, but I assume you're running at least 91 octane at all times, right?

 

[joosdawg]

Thanks for the tips, i do plan on turning the boost down tomorrow morning for sure and trying again to see what i wind up with. I havent gotten the AFPR yet just ordered on Tuesday and updated my vehicle profile today with that . Of course i always fill up with 93 octane from Mobil .

 

[Talesin]

Darn California, keeping the good stuff out... we just get to play with 91, without going to specialty stations that charge dramatically inflated prices (and when you're paying three bucks a gallon regularly, should give you some idea). :b

Anyway, toss the new logs up once it's been dropped back to 16.

 

[joosdawg]

Well i didnt get a chance to get another log yet but i turned the boost down. One problem i am having though is rough idle. The only way i can get it to idle decent is with the 1000rpm set to +18 !?!? i thought with 750's id have to have at least -10 to idle right but when i had it at that setting it died within 5 sec. Then at +0 it died in about 8 sec at +5 it idled but roughly and didnt idle right til +18. BUT at that setting when im driving if im crusing in 4th gear around 30-35mph at 2000rpm maybe a little above it will start knocking . Any suggestions? btw about the octane our local citgo stations all carry race fuel at 110 octane but your not allowed to pump it into your car, they make u use the red containers but the stuff is like $6 a gallon at least.

 

[Staytuned]

You need to turn down the boost and get control of that knock before you BLOW that bi*** up. Start by going back to 15 or 16 psi add some fuel to it (3%) right from 2000 up on the high settings you are way too lean at .88v. What do you have for high settings right now?

 

[Staytuned]

Also need to know you fuel trims for low and med. They are meant to be around 100%. If they are higher that means you are too lean - add fuel - if they are lower you are too rich - take away fuel. With the 2G maf you are going to run leaner hence why you are adding fuel at idle.

 

[xcz504d]

Hows your fuel delivery system? Im assuming you have a walboro 255 like everyone else, hopefully re-wired (if not you are probably getting voltage drop in high RPM's) I'll assume you have stock fuel lines (they are restrictive, replacing those should let those 750's really open up!) and tell me you're not running 750's on the stock fuel rail... the stock fuel rail is known for bad flow, rich in the first injector and lean in the last, fuel rails aren't that expensive and I bet you'll drop your knock down by almost half... Depending on the size of your turbo, a 20 G with 750's on stock fuel lines and fuel rail

Re-wire your fuel pump
Upgrade your fuel rail
Maybe look at upgrading your fuel lines

do that and you should be able to run a nice 60 trim if you wanted to

Everyone always wants bigger injectors and bigger turbos but forget to support them properly... you might as well not even change your oil while your at it...

Let us know how things turn out once you dial down to 16 PSI...

 

[Talesin]

And the only way to idle perfect is by switching over to DSMLink, or one of the standalone EMS units. Never understood why people would beat themselves with an SAFC, if DSMLink was an option.

 

[Staytuned]

Biggest thing is to get that AFPR on there and set your base fuel pressure to 38 psi with no vacuum on it. Then go back and set your low fuel trims and then move on to WOT tuning, starting with a nice moderate boost level. Your timing curve is way too advanced right now to start throwing big boost numbers at it.

 

[Staytuned]

I'll add this to help also.

1G tuning guide for the AFC.

 

[joosdawg]

OK here is another log that i did thismorning. I reset the boost controller for 12psi just to be safe. Now it is still creeping up to 20psi by redline though . My first log here was a 2nd gear pull from just under 2K. The second pull was 3rd gear and shows some significant knock issues again. So basically any input on how much % to add to the top end to start with and where to add it would be awsome. Also about my idle and Lo throttle it seems i need 1000 and 2000 set at +18% in order to idle and drive right or it sputters badly, does that sound right?

For the logs my Hi throttle trims are at:
1000 2000 3000 4000 5000 6000 7000 8000
|-5_|_-4_|_-4__|_-3_|_-2_|_-2_|_-1_|_-1|

RPM_____O2-R_KNCK_TIMA_TPS
1781.25rpm 0.60V 0 21.00º 100.00%
1875.00rpm 0.66V 0 21.00º 100.00%
2000.00rpm 0.18V 0 22.00º 100.00%
2062.50rpm 0.25V 0 23.00º 100.00%
2187.50rpm 0.62V 0 23.00º 100.00%
2312.50rpm 0.66V 0 24.00º 100.00%
2468.75rpm 0.57V 0 23.00º 100.00%
2593.75rpm 0.49V 0 22.00º 100.00%
2750.00rpm 0.74V 0 21.00º 100.00%
2906.25rpm 0.74V 0 20.00º 100.00%
3062.50rpm 0.72V 0 19.00º 100.00%
3281.25rpm 0.82V 1 17.00º 100.00%
3531.25rpm 0.86V 0 20.00º 100.00%
3687.50rpm 0.84V 0 21.00º 100.00%
3937.50rpm 0.84V 0 21.00º 100.00%
4125.00rpm 0.84V 0 22.00º 100.00%
4406.25rpm 0.84V 0 22.00º 100.00%
4656.25rpm 0.86V 2 21.00º 100.00%
4906.25rpm 0.86V 1 19.00º 100.00%
5187.50rpm 0.86V 1 21.00º 100.00%
5218.75rpm 0.86V 1 20.00º 100.00%
5500.00rpm 0.88V 1 21.00º 100.00%
5843.75rpm 0.86V 0 22.00º 100.00%
5843.75rpm 0.86V 0 24.00º 100.00%
6156.25rpm 0.86V 2 24.00º 100.00%
6218.75rpm 0.86V 2 23.00º 100.00%
6593.75rpm 0.86V 1 21.00º 100.00%
6718.75rpm 0.86V 6 20.00º 100.00%
6843.75rpm 0.86V 6 18.00º 100.00%
7062.50rpm 0.86V 5 16.00º 100.00%
7062.50rpm 0.86V 5 16.00º 100.00%
7343.75rpm 0.86V 6 16.00º 100.00%

Now here is the log from 3rd gear which is still knocking badly

2031.25rpm 0.68V 0 21.00º 100.00%
2062.50rpm 0.72V 0 22.00º 100.00%
2125.00rpm 0.74V 0 23.00º 100.00%
2156.25rpm 0.37V 0 22.00º 100.00%
2250.00rpm 0.66V 0 22.00º 100.00%
2312.50rpm 0.43V 0 21.00º 100.00%
2375.00rpm 0.76V 0 20.00º 100.00%
2437.50rpm 0.78V 0 19.00º 100.00%
2531.25rpm 0.80V 0 18.00º 100.00%
2562.50rpm 0.80V 0 17.00º 100.00%
2625.00rpm 0.72V 0 16.00º 100.00%
2750.00rpm 0.82V 0 16.00º 100.00%
2812.50rpm 0.86V 0 15.00º 100.00%
2906.25rpm 0.84V 0 18.00º 100.00%
2968.75rpm 0.84V 0 21.00º 100.00%
3093.75rpm 0.80V 0 21.00º 100.00%
3156.25rpm 0.80V 0 22.00º 100.00%
3250.00rpm 0.82V 0 22.00º 100.00%
3281.25rpm 0.80V 0 23.00º 100.00%
3343.75rpm 0.82V 0 24.00º 100.00%
3468.75rpm 0.84V 0 24.00º 100.00%
3562.50rpm 0.82V 0 25.00º 100.00%
3656.25rpm 0.84V 0 24.00º 100.00%
3718.75rpm 0.84V 0 24.00º 100.00%
3812.50rpm 0.84V 0 24.00º 100.00%
3875.00rpm 0.84V 0 23.00º 100.00%
3968.75rpm 0.84V 0 23.00º 100.00%
4062.50rpm 0.84V 0 23.00º 100.00%
4156.25rpm 0.86V 0 23.00º 100.00%
4218.75rpm 0.86V 0 22.00º 100.00%
4375.00rpm 0.86V 0 23.00º 100.00%
4375.00rpm 0.86V 0 23.00º 100.00%
4562.50rpm 0.86V 0 22.00º 100.00%
4593.75rpm 0.86V 0 21.00º 100.00%
4625.00rpm 0.86V 0 21.00º 100.00%
4718.75rpm 0.86V 0 21.00º 100.00%
4781.25rpm 0.86V 0 20.00º 100.00%
4781.25rpm 0.88V 0 21.00º 100.00%
4937.50rpm 0.88V 0 21.00º 100.00%
5000.00rpm 0.86V 0 20.00º 100.00%
5250.00rpm 0.88V 0 20.00º 100.00%
5218.75rpm 0.86V 0 21.00º 100.00%
5343.75rpm 0.88V 0 21.00º 100.00%
5531.25rpm 0.86V 0 21.00º 100.00%
5468.75rpm 0.88V 6 22.00º 100.00%
5562.50rpm 0.86V 5 20.00º 100.00%
5718.75rpm 0.86V 5 20.00º 100.00%
5843.75rpm 0.86V 8 20.00º 100.00%
5968.75rpm 0.86V 15 21.00º 100.00%
6000.00rpm 0.86V 21 18.00º 100.00%
6000.00rpm 0.86V 21 16.00º 100.00%
6156.25rpm 0.86V 21 16.00º 100.00%
6156.25rpm 0.86V 21 14.00º 100.00%
6218.75rpm 0.86V 20 14.00º 100.00%
6375.00rpm 0.86V 20 14.00º 100.00%
6437.50rpm 0.84V 20 15.00º 100.00%
6500.00rpm 0.84V 22 14.00º 100.00%
6562.50rpm 0.84V 21 13.00º 100.00%
6625.00rpm 0.84V 21 12.00º 100.00%
6687.50rpm 0.84V 21 12.00º 100.00%
6625.00rpm 0.84V 21 11.00º 100.00%
6812.50rpm 0.84V 20 11.00º 100.00%
6937.50rpm 0.84V 20 12.00º 100.00%
7000.00rpm 0.84V 20 12.00º 100.00%

 

[joosdawg]

btw i tried to post that at like 2PM today but appearently it didnt work sense it still said loading when i just got home so i hit refresh and it didnt post it
Also for anyone who didnt read the car profile or w/e i do have a 2G MAF on my 1G if that makes a differnce in the replys

 

[xcz504d]

http://www.stevetek.com/R-FuelSys.html

Good article on the stock fuel system...

No knock in 2nd and knock in 3rd isn't un-common... Switch to a standalone and you can fix it But if you can't afford it, blame it on the boost creep

I don't know what size turbo you're running but it sounds like it spools nicely... maybe a little to nicely for your wastegate... Is it internally gated?

 

[joosdawg]

Well the thing is i actually bought the car with all these things that are on it now and im trying to fix what the previous owner left out like the FMIC and AFPR ect. I personally wouldnt have chose to have such huge injectors id rather have like 550 or 650's with a 190FP but this is what i have to work with now. Btw im running a ported 2G manifold with ported Evo3 16G but obviously not ported enough . Yes its internally gated but i have an external dumped O2 housing to fix "some" creep. I can really start seeing all the money im gonna have to spend just to get this thing running right and everything. Well i do have a laptop already and this car has an EPROM ecu already so maybe it would be best if i get the front mount on, along with the AFPR, then save a little more and get a dsmlink package and have absolute controll insted of this SAFC garbage.

 

[xcz504d]

Bingo... SAFC... Problem child... Lets do some math... SAFC can go up or down 50% right? Right...

Stock injectors are 440, 440 * .5 = 220

220 + 440 = 660

660 injectors is as far as I would take it... Anything else and you're going to be all messed up...

Even though you would be running rich with bigger injectors, you have to think about things such as injector pulse and what not... So DSM link is probably a great idea... or a cheaper option, GM MAF translator and a GM MAF... $300... use that to compensate then adjust with your AFC... But for $200 more you wont have to piggy back a piggy back system...