Has anyone tried using 160# injectors or am I the only one? I will admit its a big change. I can get the car to drive around town pretty good. The one thing that disturbs me is I cant have the car in closed loop. If I turn the wide band on to correct at all the car starts bucking and having lean spots in the map. I turned it on under boost and this thing is miss firing but the correction doesnt seem to be wild like under cruise. I will have to try running the car with no wide band activation.

Im just wondering if I upgrade my box to a SFI can I run around town again with the wide band on all the time allowing it to correct? Anyone with a SFI box and 160's please chime in with your thoughts and experiences

 

As I stated in your previous thread, these will be a problem without SFI.
I've seen you lurking on the Turbo Buick boards as well.... they are running SFI on those (since they already have a cam sensor) with decent results.

83# units are barely controllable at idle/cruise in bank to bank. Another problem that you have is that the car is operating in identical cells at both idle & cruise, but it will require different fueling even though it is theoretically the same engine load. 3 bar MAP's & non-scalable MAP tables are a limitation here.

Going to SFI will make them act like 80# units & it should be fairly controllable. Keep in mind that since you are so oversized in your injector selection, you can also fine tune them (after getting SFI) with fuel pressure. Dropping the fuel pressure up to 10# will require an increased pulse width & get some of the resolution back. The atomization will still be poor as the pulse width is so short, so idle may still not be ideal (or at least as good as it was before with smaller injectors).

 

I am running 160's in mine SFI FAST no problems.Time for you to upgrade your box.

 

Thanks for the replies! Eveyone on the buick board bashes me telling me I cant tune a car Well that doesnt help considering I have had no problems for 3 years. I guess you cant always believe everything you hear on the net.

Z8,
What do you think of the new box? Im looking all directions Fast bigstuff and dfi. People always say go with what your use to, but i have used gen 6 and that is similar to the fast.

What kind of power you putting down with your LT1 these days? I have not pulled my motor for about 20,000 miles, but I wonder how far I can push it?. I know there are LT1 blocks in the 7's. however my block is not filled, im not convinced I need too. I would like to take it to possibly 12-1300rwhp but its very comfortable at 1-1100rwhp. What kind of luck have you had?

 

Don't you allready have dual fuel systems?

You should roll a BS3 with staged injection.

Works good

 

Yeah its pretty much setup that way. Did you plumb the intake with new injectors? I started tuning my buddies car yesterday with his BS3 and it works well with 160# injectors. The car needs to idle a little bit fat but can cruise all day long at 14.5

I have one last question. I wonder if someone can answer before I sell the Bank-bank. Has anyone tried running 160# injectors and had the 02 hunt all over the place where it couldnt control an a/f with the wideband turned on. then as soon as you put in a SFI the hunting was gone and it ran good with the wideband?

 

Yeah, 16 injectors, primary set fed by 93octane, secondary set fed by 110 octane.

http://www.ls1speed.com/pictures/70105_006.jpg

http://www.ls1speed.com/pictures/70105_009.jpg

http://www.ls1speed.com/pictures/70105_010.jpg

 

why did you decide to go that route?

 

Well, it cruises on 93, and when the 1st set of injectors hits 90% duty cycle, fueling is split between both sets of injectors. (for an instant mix of 50/50 pump and race fuel on demand).

-Better driveability driving around on smaller injectors

-cruise on 93, race gas is only used when needed

-wideband life is extended as it's not constantly seeing leaded fuel


(this is Jim (INTMD8), I posted under dans SN)

 

Yeah thats pretty much how my car is setup with out 2 sets of injectors. Did you get any better gas milage with having a small set on the car? My free way cruise is about 18-19mpg on 83's

 

So the instant you come into boost it switches from pump to race fuel? Not sure how that would be possible with one set of injectors.

 

Oh, and I havn't ran it easy enough through a tank of gas to get any decent mileage.

 

Sleeper,
You have to reduce the gain setting & % of step of the injectors under the closed loop parameters. You have doubled the size of the injector which makes this correction more aggressive. Keep making it smaller & see if it helps the hunting problem. Just be careful that it is not too small or it will not correct fast enough. Also I would limit the amount of negative fuel correction to under 10%. This will allow you to keep it lean without the computer overshooting when it corrects at the low limit of injector pulse width. Hope this helps.

 

Thanks I got the car to run pretty good without the use of the wideband at all. However I think over the winter I will get a SFI box