50 trim question

[blitz43]

what type of injectors would i need to have when running a 50 trim
610cc 550cc???

 

[KiD_DSM115]

i hear that 650's are good because of the turbo's flow rate

 

[Devicex]

I'd say 650's as a minimum.

 

[anconover]

650's at BARE minium. I personally would suggest a little bigger even, my 680s werent enough and i just went 880s, but i was doing around 26psi on pump gas. The 680's could have been enough but i had to bump fuel pressure to like 48psi.

 

[44pirate]

650's at BARE minium. I personally would suggest a little bigger even, my 680s werent enough and i just went 880s, but i was doing around 26psi on pump gas. The 680's could have been enough but i had to bump fuel pressure to like 48psi.

I'm running 660 FIC.
What kind of timing you all getting?

 

[hellotbone]

I ran 550's at 18 PSI on my car with 23+ advance I now have 650's and run 20+ psi with the same advance I don't beleive 650 to be the minimum though. My car worked fine on 550's although it may have been a little much on the duty cycle

 

[blitz43]

will i need a fuel pressure regulator if so what should my setup be??
i decieded to go with 680cc injectors to be on the safe side
if thats wrong let me know

but anyways let me know what my regulator setup should be

 

[hellotbone]

Running 650's with no AFPR

 

[gasguzzler]

The 680cc injectors will support 520 flywheel horsepower at 100% duty cycle and 468 flywheel horse at 90% duty cycle. So 580's would be too small, the 680's would be just right

 

[eclipse90gsxt]

I used 650's with 24psi on my GT-12 which is bigger.

 

[paul s]

I'm usng 650s at 46psi and get 19deg top of 4th(7000rpm) on 22psi and 94 octane..50trim.

 

[anconover]

I ran 680cc's, base FP at 37psi (stock) at 25psi on pump 93, knock was 1-4 counts, timing around 17-19.

Did a 12.3@112 on pump, stock intake mani, stock cams, blown AGX struts, and cooper touring SLE tires cutting a best of a 1.88 60ft =|

 

[lowridin2g]

i run 650's with a 255 lph and an aeromotive afpr set at 43 base fuel pressure. 22psi on 93 octane im seeing 20-22 deg timing advance by 7,000-7300

 

[anconover]

hmpf, thats a little higher than i like to run for timing on pump gas.

 

[lowridin2g]

hmpf, thats a little higher than i like to run for timing on pump gas.

may i ask why? also if i lean it out i start getting dips in my timing.

 

[anconover]

theyres such a thing as too much timing.

 

[blitz43]

i mean like do i get -6an or -8an???

 

[anconover]

-6an is plenty sufficient.

 

[lowridin2g]

theyres such a thing as too much timing.

u quoted that u see as much as 19 degrees by redline. i see about 20 by redline and i shift at 7400. about 7300 i see 21-22 deg tops. whats the big difference there honkey? i dont see one honestly. so wtf are u talking about?

 

[sweet97]

I am going with 710cc's hopefully tomorrow if Dejon got them out and UPS does their thing! I need some tips on tuning. I have 550's in now and I can run them` rich enough to hit fuel cut though it may be at a low rpm.
Just been running 15 PSI, hoping for 18 on the 710's.
I have noticed that timing will rise with the engine's RPM's. This normal? I know if the ECU sees lower air count it will increase timing. How do you do that?
I thought with higher fuel pressure the air count could be lowered allowing more timing with correct fuel from the additional base timing. Correct? All tips greatly appreciated. Mark

 

[anconover]

When tuning with large injectors without somethin better than s-afc or maft, you can bump the base fuel pressure up to around 45-50psi, so the s-afc can be leaned out so the airflow signal isnt altered as much.

But what i said earlier, ive always found my car to run best, as well as my friend maxing around 17* timing, 19 is usually higher than i let it get. too much timing on pump isnt a good thing, and to me, even just a few degrees difference, is big.

 

[psychlow]

When tuning with large injectors without somethin better than s-afc or maft, you can bump the base fuel pressure up to around 45-50psi, so the s-afc can be leaned out so the airflow signal isnt altered as much.

Leaning out the airflow is the problem. If you have 650ccs, you're already at approx. -30%. If you up the base pressure, you're going to make that number lower, therefore metering less air into the ECU and increasing timing advance.

Getting a 2G MAS doesn't help, either. You may not be leaning out anything on a SAFC, but your ECU is reading less air from the MAF.

In the end, you're going to be registering x amount of air for y amount of fuel flow.

 

[pimpinboudy]

i used to have a 50 trim blew up twice, but anyways i run 680's and my s-afc 2 is set at -30%'s so i would go with 680's just in case you blow it up and want to go with a bigger trim.

 

[sweet97]

Well I ordered the 710/720's. My thinking is probably wisted but here I go again.
I plan to set my base pressure high, say 50 psi instead of 40 psi. Using the MAFT I will ean it at idle to run proper trims. Then at WOT I will have extra fuel which will allow me to lean allowing more timing but I will have the fuel there to run a safe A/F. Injectors due today. I will let you all know! Mar

 

[blitz43]

i used to have a 50 trim blew up twice, but anyways i run 680's and my s-afc 2 is set at -30%'s so i would go with 680's just in case you blow it up and want to go with a bigger trim.

exactly what did you do to blow to 50 trims?????