GrannySShifting

iTrader: (10)

Maybe Im missing something here, but I cant get the idle pulsewidth to even stay on the minimum. Lowest I can get it to go to is 1.0ms or so and even then it jump erratically between that and 1.9. Was 1.3min from factory of course and jumping to 2.6, so something is intermittently doubling it.

220# injs, lots fuel need to get the low end of this map cleaned up, killing the oil right now. Can email tune file or log

jimmyblue

iTrader: (11)

If your idle MAP is jumpy, from the cam be lumpy, your
injector shot will simply follow. Scan tool frame rate may
not follow all that well, may decimate the data. But if
you see unsteady idle MAP then this may be the deal.

GrannySShifting

iTrader: (10)

Idle kPa stable, little cam, its a turbo car. doesnt jump around with different data points, its dead on one value or another, one value or double that value. Something in ECM is causing that, theres no table that wouldnt interpolate and come up with in between numbers.

SoCal01z28

iTrader: (11)

My idle PW is around 2.1 for what it's worth, why don't you post the log?

edcmat-l1

iTrader: (10)

You're pretty much at the limit of control of the injectors. You can't really run em much lower than 1 ms. I've got em to run in the high .8 to .9 range, but that's about it.

I wold bet that it's pegging your fuel trims. Then it re-zeros, that's when you get the jump from 1 ms up to 2 ms, and then it starts over.

As suggested, how bout a log and tune?

Schwanke Engines

iTrader: (1)

If you can't get it low enough, you might have to idle it higher or think about putting in a vacuum biased fuel pressure regulator. At least you could kill the pressure down low and command a higher pulse width for the idle stuff.
How much power are you making with this setup? Those injectors could make a conservative 2500hp!!!!

edcmat-l1

iTrader: (10)

Only problem with that is at low pressure those big injectors spit. It ain't purdy. I would almost suggest smaller injectors, and a boost referenced reg. Although I have no idea what power level we're dealing with.

NicD

iTrader: (7)

Assuming it's the T76 rear mount car on E85 in his sig I can safely say those injectors are way too big.

GrannySShifting

iTrader: (10)

Really? I was at 100% dutycycle at 80 psi base pressure with ID1000s. Makes around 950 flywheel on the 76.

Reduced base pressure to make it easier on the pumps, would be roughly 150% duty cycle at same power level with 100#s in it still, and at times have a few hundred more hp that needs to be fed. Theres no in between injector for a stock computer.

Ed if i could get them to stay steady at 1.0ms id be fine I think, they just wont stay there. Completely erratic 1.0/1.9/1.0 - open loop, no fuel trims

edcmat-l1

iTrader: (10)

Dude, you've got it in 3 bar, but you've still got the MAF functional. I've only got a few to work right with both.

Anyways, send me an email. edcmat-l1@msn.com. We'll take it there.

1slow01Z71

iTrader: (36)

Isnt the only way to get teh MAF to work with a 2 or 3 bar tune is for out-of-boost driving then as soon as the MAF is pegged it defaults to the extended VE table and wont go back to using the maf till the key is turned back off?

NicD

iTrader: (7)

Considering 120lb injectors would suffice all the way up to 850-900 rwhp with E85 on a T76 which is where that turbo will max out, yes those injectors are definitely overkill.

GrannySShifting

iTrader: (10)

considering there are no 120# inj you can run on a stock computer like i run, and I made 799 thru a glide on my mustang dyno with a new NTK sensor and the measured data I gave you to arrive at that a/f, with 15 volts at the pump, on the next size down high impedance injector (ID1000s) these arent guesses. Ive done it, used up all the ID1000s could give, and need to feed a few hundred more hp at A) less volts B) less base pressure. Only one bigger high impedance inj that Im aware of, and its the 220s

it throws MAF fail immediately on startup, so dont think its functioning?

GrannySShifting

iTrader: (10)

It is in 3b, but its actually a sensor ranging up to 40 something psi. Ill shoot you an email, see if you used that sensor before too

NicD

iTrader: (7)

I fully believe the ID1000s aren't enough, those are only ~95lb injectors so I am not sure why are are arguing. There are plenty of other options in between those two injectors you listed when you run a driver box on your factory PCM like I am doing to get you where you need to be without riding minimum pulsewidths and having muddy idle/decel fueling. The jump from a 95lb injector like the ID1000s to the 220s is more than double and you are going to have problems with them being as large as they are. A set of 120lb injectors are going to flow damn near 30% more than those ID1000s getting you to where you want to be and I can tell you from experience they idle great and clean at stoich on a 347ci setup even.

GrannySShifting

iTrader: (10)

i dont really want another box, bunch of wiring in the car. Trying to reduce electrical load as much as absolutely possible, and theres enough wiring another 16 harness is a mess i dont want to deal with when its always changing

NicD

iTrader: (7)

Well... I guess you're screwed if you are going to limit yourself like that but Racetronix makes a nice plug/play harness for the versafueler that takes 5 minutes to install.

Schwanke Engines

iTrader: (1)

So you are using a 220 # high inpedence injector that you want to run at 1ms pulsewidth!!!!!

I don't let 60lbers go below 3ms. Makes for a very unstable idle because of the injectors not even turning on sometimes below that.

Like was stated, if you need that much fuel, you are going to need the driver box and get some low impedance injectors.

What you are trying to do is pretty much like going to prom with your sister, yeah, your there, but it just ain't right!!!

Frost

iTrader: (45)

60's are easily stable down to 1.1mS. At 3mS, you are going to have a FAT idle with 60's!

edcmat-l1

iTrader: (10)

Yep. The 60s in a smaller motor HAVE to idle at about 1ms.