ECUflash O2 won't cycle in idle, need ecuflash PTE 1000 base settings

[HadesOmega]

I was previously running SAFC and EVO9 injectors setup and it worked great but I want to go to bigger injectors. So I bought some PTE 1000 injectors (I verified that they really are PTE 1000s also by looking up the numbers) and put them in and am running ecuflash in my 98 GST.

From what I have found in some base settings charts is that PTE 1000 injectors should be initially set at:
Injector Flow = 940
Deadtime = 0.450 (taken from ECMlink wiki)

So I install the injectors and input the settings into ecuflash and flash the ecu. Now the car runs but the O2 reading stays steady in the rich section of my guage. Evoscan doesn't show any O2 sensor reading and the fuel trims aren't moving. I have no clue if the evoscan is working but the O2 won't cycle its stuck in open loop. But when I drive the car it will cycle. I know I don't have a wideband and I should get one but all I'm really concerned with right now is to get the idle and then cruise tuned. At the very least have it idle good. If I want to tune my WOT and fuel maps I can take it to dyno where they have a WB02

So here is my setup and what I have:
98 GST
ECUflash
PTE 1000cc injectors
190 pump rewired
SAFC (but its zeroed out)
Autometer modified narrowband AF ratio gauge (it has been modified by gadget seller to have a finer resolution, old school tech)
Base settings: 940 injectors flow, .450 deadtime


Here is what it does: Car warms up then the gauge will slowly go from lean all the way up to lean and stay there solid. Normally it would cycle and bounce all over the place. Normal driving it cycle fine and seems to run fine. Now sometimes from idle to take off it will kind of stutter or bog down then when it gets revved up and moving it will be normal. So my guess is that my settings are incorrect and the idle affected by it. I tried different settings and nothing will bring it into closed loop during idle. Thinking that maybe it is too rich I tried increasing injector flow to 970 and I've been incrementally increasing deadtime by .05 and I'm at about .600 now way off from .450 and it still runs pretty much the same. Close to just putting the evo injectors back on and playing with those.

Does anyone have a similar setup using ecuflash that I can use?

 

[HadesOmega]

Ok I've solved the problem. I was adjusting the deadtime/latency in the wrong direction. I was thinking that increasing the deadtime will make the idle mixture leaner but it actually does the opposite.

The O2 will cycle in idle now but its not perfect, I can still see it fighting to lean the mixture more so I will probably lower the deadtime a little more, its close. I'm at 325 right now where the DSMlink wiki had me starting at 450. Will probably drive it for a bit and see what happens, the fuel trims are still negative, like around -10 to -12.

If it helps anyone this little ECUflash/Evoscan tutorial helped. Found it at 3SI but should still apply to us.

How to: Tune Scaling and Latency tables for larger fuel injectors using ECUFlash - 3000GT/Stealth International Message Center

Here's the part that helped me out the most:

As for adjusting your tables after trims are logged, use these as your guides:

* If trims are roughly the same, but positive, then you need to lower your injector scaling number.
* If both trims are roughly the same, but negative, then you need to raise your injector scaling number.
* If idle or cruise trim is positive, then you need to increase the latency value.
* If the idle or cruise trim is negative, you need to decrease the latency value.

Note: After adjusting for the Latency, you may need to readjust the Scaling accordingly.

More latency = more fuel
Lower scaling = more fuel

Less latency = Less fuel
Higher scaling = Less fuel

Latency will roughly affect idle about twice as much as cruise and almost nothing at WOT/high airlfow. It's is inversely proportional to the IPW. As I mentioned earlier, Latency is basically telling the ECU how long the injector takes to respond. So, if you put in a larger latency value, you are saying 'this injector is slow to respond, so add this amount of time to keep the injector open'. So, this time is basically added to the IPW. That's why it will affect idle more than cruise and WOT. The IPW at idle may be 1ms and cruise may be 2ms, for example. If you are adding .1 ms to the deadtime, it's increasing the IPW by 10% at idle ( for a 1 ms IPW).

Will post my final results if I ever get this thing idling and cruising perfectly just in case someone has trouble getting their PTE 1000s dialed in.

 

[xxNocturnalxx]

baseinjectordata [ECMTuning - wiki]

This is needed info as well.

 

[HadesOmega]

Yep thats the table I got the deadtime from

 

[92tsifwd]

I have PTE 1000cc injectors and I am using tuner pro. I have the injector comp at 872cc at 37psi base. That is as close to 862cc I can get. I was wondering if I added the 336ms the wrong way also? I keep getting wet plugs and it cranks and won't start gas on top of pistons and plugs completely soaked. I added 14 hex to the stock values in the deadtime map. Or am I suppose to subtract 14 hex? I have tried 288ms 336ms 432ms and 480ms. All of them I added hex. Unless I am going the wrong way I am stumped. I also tried dialing the injectors in at 947cc even though they dont flow that much at 37psi base and no luck. I know these pte 1000's flow 940cc at 43.5psi. Please help. Thanks, Jason

 

[keithlag]

Bringing a old thread back but did you ever get a final setting.

Ok I've solved the problem. I was adjusting the deadtime/latency in the wrong direction. I was thinking that increasing the deadtime will make the idle mixture leaner but it actually does the opposite.

The O2 will cycle in idle now but its not perfect, I can still see it fighting to lean the mixture more so I will probably lower the deadtime a little more, its close. I'm at 325 right now where the DSMlink wiki had me starting at 450. Will probably drive it for a bit and see what happens, the fuel trims are still negative, like around -10 to -12.

If it helps anyone this little ECUflash/Evoscan tutorial helped. Found it at 3SI but should still apply to us.

How to: Tune Scaling and Latency tables for larger fuel injectors using ECUFlash - 3000GT/Stealth International Message Center

Here's the part that helped me out the most:



Will post my final results if I ever get this thing idling and cruising perfectly just in case someone has trouble getting their PTE 1000s dialed in.