Sard Injectors And Pfc

[Badgaz]

pulse timing is a whole map calculation however like GTSboy says it is more noticable at idle and light load due to the fact the injector is opening and closing at a slower rate therefore making the latency timing more important.....its often a struggle to get larger injectors to idle well anyway...however newer tech injectors don't seem to suffer the same issues.

[chiksluvit]

ok

well car doesn't run, doesnt rev clean in neutral and wants to stall if i attempt to drive it

guess i'll have to pull it out again to see if it is leaking from the bottom O ring

[Dose Pipe Sutututu]

pulse timing is a whole map calculation however like GTSboy says it is more noticable at idle and light load due to the fact the injector is opening and closing at a slower rate therefore making the latency timing more important.....its often a struggle to get larger injectors to idle well anyway...however newer tech injectors don't seem to suffer the same issues.

bump up the idle RPM to around 900~1000rpm and run it pig rich

[chiksluvit]

its already pig rich as is lol

besides 540cc isnt THAT big

[Badgaz]

drop your correction factor on your injector size then if its pig rich....this is the other calculation that is not an exact science.

[chiksluvit]

Ok will try a few things tonight before I pull the injectors out again

Btw with the 850ccs, did you have to get new O rings for them or were the supplied O rings fine?

[Badgaz]

the supplied ones were fine....just check them for splitting, perishing or stretching if they aren't new ones.

[Humbla]

The cheap man pays twice... As you just found out.

Any Sard injectors will have similar issues, and they get worse the larger they are.

I can get new 550cc sidefeeds to suit the 33 that will run fine, but that is the largest they can supply. For anything else you will need to fork out for genuine Nismo's, or swap to a top feed setup which work out around the same price.

I've been running sard 650s in my 93 liner for 9 years with the first round of PFC with supporting mods no probs,it's all with the tune,

I have been using a fantastic PFC tuner in Sydney, hi yavuz. :-)

[chiksluvit]

Ok just gave all the suggestions a go, no luck

Didn't hydro lock the engine when I started it so that probably rules leaking O rings out

The car doesn't want to stall anymore, would go back to idle fine at traffic lights, unlike yesterday when I was playing with the latency. Idle holds steady and is actually driveable. Just down on power and feels like it's running on 5 cylinders.

I haven't had time to check if it's actually a bad injector just yet, could only confirm that it's not #1 caus it's the easiest one to get to

Btw these 540s should be the same injector series as those 650s, same shape, both twin sprays just different colour.

If it works fine on ur car it should be fine on mine, providing that there's no damaged injectors and it's set up properly

Edited August 27, 2014 by chiksluvit

[Humbla]

I had my tuner do all the work,I do 30000 a year

hope you get it sorted.A lot of mechs put the sards

in the two hard basket but some can get it right,

where are you? I will recommend my tuner,uni group engineering in Sydney

yavuz is the genious with the PFC and what not. :-)

[Badgaz]

one thing you can do is grab a long screw driver stick it to your ear and put it on to each of the injector metal covers and listen for it ticking....if you don't hear one ticking it could be stuck... all 6 of my freshly flow tested 850's were stuck....

[chiksluvit]

Thanks guys

Yeah I had both nismos and Sards in two of my old cars and felt the Sards did the job just as well. Sure it wasn't exactly as easy as the nismos but I didn't have to worry about breaking the pintle caps when putting them in

At least the Sards are probably easier to pull out now because it uses Allen key bolts, just maybe not the #5 and 6

Yeah I'm in sydney but I've always gone to Toshi to get my cars tuned, since he just lives around the corner for me

Will try the screwdriver trick thanks Badgaz!

Edited August 27, 2014 by chiksluvit

[chiksluvit]

Ok here's the latest update

Tried the screw driver trick, could hear all injectors going

Pulled the plugs on #1, 2 and 6, all seems to affect the engine. Couldn't get to the plugs on 3, 4 and 5

So went back in the car and tried to adjust the latency on individual injectors, individual changes made to 2- 6 affects idle except for #1 cylinder.

I could put the latency correction to -1 and it won't make any difference, yet if I pull the plug then it will. So it seems like #1 injectors delivering fuel but not responding to latency changes

Can this happen? I thought injectors either die or alive?

PFC is brand new when a bought it a couple of mths ago, so I doubt it's the ECU

[Badgaz]

do you have a wideband? if you can get the afr's roughly right it should be driveable.... you'll need to get it to a tuner with a fcdatalogit.

[chiksluvit]

do you have a wideband? if you can get the afr's roughly right it should be driveable.... you'll need to get it to a tuner with a fcdatalogit.

Nuh I don't have a wideband

It is driveable, just lack of power and sounds like wrx, I already took it around the block a couple of times today when testing it. Lucky toshi doesn't live too far away so I can get the car to him once I replace #1 injector if it is a dud

At least if it's really #1 then I won't have to pull the rail out again, it's easy to access that injector

I'm just puzzled at how it could be possible that an injector is delivering fuel but not respond to adjustments made while others do, in both fuel % and latency

[Dose Pipe Sutututu]

yeah just bring it to toshi - done.

[chiksluvit]

not much he can do about it now

he reckons its likely that either one of the injector's dud or ECU or coilpack is stuffed

seeing it was runnings 100% before the injectors i guess one of the injectors needs to be replaced

will be checking the spark plugs later

[chiksluvit]

Update: as Toshi has suggested I've taken the spark plugs out and had a look at it

they were all running rich judging by the spark plugs, this is from cyl 1, the rest all pretty much looked the same

AFAIK they all still produce spark- engine drop revs when each of the injectors were unplugged, including #1

Only thing suss- cyl # 1 injector doesn't respond to changes on the PFC

Changes on every other injector affects idle

so could be the PFC, could be the injector. The PFC is only 6 mths old and injectors were also new

[Dose Pipe Sutututu]

Could be a lazy injector that's responding slow and staying open too long

Best to pull them out and get them flow tested/cleaned

[chiksluvit]

ordered a new injector, will replace cyl 1 injector n see how i go next week