Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Injectors

Would the stock 17# injectors on the 95 SE be maxed out by these mods: KKM, chip, custom y-pipe with high flow cat, 00 SVT UIM, SVT TB, Aussie Pipe, custom cat-back exhaust based off the SVT exhaust with a performance muffler and no rear mufflers? I don't want to put all these mods in if the stock injectors would not be up to the task. I have searched and found that the 17# injectors max out at about 200-205 hp. So I guess I am asking if these mods will get me close to that number or not. Also, with these mods would I want to get a custom burned chip?

no, on the injectors

maybe on the chip, while its not absolutely necessary ut would help to get max HP

I have a similar setup on my Cougar.

Injen
SVT TB
00 SVT UIM
Stock y-pipe cut and welded
Hi-Flo cat/Dynomax/2.5 pipe exhaust

I know I run too lean at WOT...usually hitting around 0.92V or so. I have an AutoTap and an Apexi to prove it . The Apexi only seems to be to be partially able to richen up the mixture at WOT.

So, I am going to 19lb injectors and a 73mm C&L MAF calibrated for those injectors. Results yet to be seen but I am using figuring around your idea, where if your starting to hit close to the HP of an SVT engine (192 HP originally), then 19lb injectors become required. Ford would have not spent the extra money for different/larger injectors if they were not required! (trust me I have worked for them)

If you do decide to do 19lb injectors though make sure you either have an MAF/Apexi/Chip (at least two of those). Otherwise your engine will likely run too rich ... loosing HP and blowing away your cat early.

If you go to bigger injectors, you only really need one of the following: MAF, Apexi, chip. More is better, but just having the S-AFC is enough to adjust properly. Having a MAF (or chip) for the injectors would certainly make it easier (baseline is already taken care of) but it's nothing the S-AFC can't handle by itself.

If you don't have any of those three, you will set a perma-CEL and run too rich when you go bigger.

I am running .86 to .88 at WOT according to Dyno and obd-2 datalogger testing. Will new 19 lbs injectors help correct the lean condition without outside help? Or will the 19lbs work like 17lbs, just having the ability to add fuel? leaving no adjustment?

How hard would it be to find 19# injectors for my 95 SE? Also how hard would it be to install them?

19lb injectors will help with lean at WOT conditions because the PCM will be firing the injector with the default pulse width but since it is a bigger injectors = more fuel.

easy

0.92V isn't too lean. That's about right.

Maybe, maybe not. The bigger injectors will cause the PCM to learn a large negative Long Term Fuel Trim, meaning that it will shorten the injector pulse width under closed loop conditions. AFAIK, the LT Trim is used as one of the inputs under WOT (but not the O2 sensors) to determine how long to fire the injectors.

That being said, when I went to 24# injectors, I set CELs for Too Rich i.e. LT Fuel Trim too negative. Bill Jenkins did the same when he installed SVT injectors in his Gen 1 Mystique. To get rid of my CEL, I only had to set the AFC below 4000 RPM at part throttle. No CEL so far (about a week). Probably because not too much closed loop driving gets done at 4000+ RPM.

Bottom line, if you want to hunt down that lean problem (and .86 - .88 is something I would be concerned about) by putting in bigger injectors, you are going to need something to control them. You would probably be better off getting that something first, seeing if you can use it by itself to richen up properly, then go for bigger injectors if you still need more fuel up top.

Greddy or Apexi, still waiting to see the results. The nice thing about these mods is that they are transferable to another vehicle unlike other contour mods.

Now I just need to find some low mileage return style 19lbs injectors.