ECUflash 680cc SCALED TO 472 = :) afr's & trims...?

[FLASH1970]

Ok, so I've been playing around with my 95GSX and my injector scaling has me scratching my head.

big 16g
3" exhaust
251 comp cams
6 bolt swap 2g piston/1g rod, bse
MLS with ARP studs
hallman MBC
255 pump with Aeromotive AFPR
AEM fuel rail
ETS street FMIC
still using the 2g throttle body
lightweight flywheel
680cc injectors
lc-1
HKS SSQV BOV recir'd
43psi fuel pressure at idle

Now I've done some idle logs and my trims are +/- 2%. But my wideband is displaying 14.3ish when the AFR map is calling for 14.7.
My mid trim is at 6.25 but I haven't done a full 16 minutes of cruising.
My WOT in 3rd gear at 15psi is for the most part at 11:1 +/- .2
I did a log where I turned up the boost and it hit 22psi and tapered off to 18psi by 7K and my IDC was at 66.


I added .300 to all the injector latencies and highlighted all of them and scaled them down as needed.

11.72v- .986
14.06v- .797
16.41v- .662
18.68v- .554

and my injectors are at 472. Has anyone had to scale their injectors so low?

 

[livedsm4g63]

Usually when you have to do that the latencies are outa wack. However I have read that using this program the injectors are usually scaled down 10-15%. Does that 11.1 full pull match your table? If so leave it at that global setting then start fixing the latencies.

 

[FLASH1970]

I let the car idle for about 20 minutes and the "Fuel Trim Low" never settled outside of +/- 2% when it would complete a cycle. So that would tell me my latencies are pretty good. I've only done about 10 minutes of cruising so I haven't really looked at my Mid fuel trim yet but it was at 6.25% which still isn't extremely far off. I'm going to recalibrate my wideband even though I just did a couple weeks ago to see if I can get my idle AFR to match what's in my AFR map. Not sure if I should try messing with the MAF scaling/smoothing to get my injector scaling closer to what the injectors are. Right now they're scaled down about 30%...

Here's what I used to get where I'm at.

Injectors « ceddy.us

I also used the "Merlin's guide to EVO tuning" method 2 for injector tuning found on page 71 of the PDF file to set up my injectors.

 

[livedsm4g63]

How far off is the gauge to your computer?

And what is your fuel cells set at when doing a 3rd gear pull? 11.1?

 

[FLASH1970]

At idle my wideband is reading 14.3 bouncing around +/- few points. The AFR Map calls for 14.7. At WOT the AFR Map calls for 11.0:1 and the wideband is recording 10.8:1-11.2:1 so it's 11.0:1 +/- a couple points.

Maybe I'll scale the injectors up and reduce the latency. I did add .300 latency across the board as suggested in the injector chart for PTE 680's, which I then reduced the latency by 10% to get my trims in check.

I have a V2 DSMLink setup I might try and throw in my car and see what I get using that for injector scaling, global deadtime numbers (I think that's what DSMLink calls the latency) to get low and mid trims dialed in. I don't feel like wiring my wideband into the ECU to WOT pulls.

 

[livedsm4g63]

Seems about right for the global(while doing the pull). Kinda weird how low it is, but if your idc is good, id go with it. As long as your hitting what your map is saying to hit. Aka thats how your supposed to set "global" scaling.

As far as your idle being off a little, and your mid being off over 6%.

I know somewhere in those readings there is a place that goes over this. You want to get the lower fuel trim reasonably close (which it is) then go do a cruise log. When you see what your mid fuel trim is doing, you make a fix.

When you make a fix you would be correcting the mid fuel trim, however when you do this, it may ulter the low fuel trim. I forget what was is positive and negative. Ill find it in the manual. Kind of confusing if you ask me. Why cant ecmlink be in every car

Either way your very close, you just have to tweak the latencies a little.

 

[FLASH1970]

Kinda weird how low it is, but if your idc is good, id go with it. As long as your hitting what your map is saying to hit.

Why cant ecmlink be in every car

That's what I was thinking. All the examples I've seen have them scaled around 610-640 and mine are 472... but my AFR numbers are good so I guess I'll go with it. Just seeing if there's another way to do things.


yeah yeah yeah... I know. DSMLink is pretty easy to use. And the forum support is there. Thanks for your help/ 2 cents by the way. Once you get the hang of ECUFlash it's not so bad. There are write-ups to help you out too, like the ones I linked to or mentioned. And spend the money on one cable, 25 bucks for EVOScan, and you can tune/flash as many cars as you want versus 1 DSMLink setup per car.

I haven't done enough cruising to let my mid fuel trim settle in. Once it does, I'll log the Mid Trim and Hz when cruising, then go into the MAF smoothing table and adjust the numbers around that Hz area to get my mid trims in check (if needed) without screwing up my low trims.

 

[livedsm4g63]

Thatd work too. I suppose it helps to own an evo I really should tune the evo. Ive been putting it off. haha.

One thing I did think of though.

If your gauge is way off as you stated it might need a recalibration, then that would mean the global would be off. Meaning, it is reading really low. This would assume that your idle is fine and your afr on the wot pull is lean. If that was the case your global would be set to low. In order to correct it you would have to raise it. But I guess thats a what if question.

 

[FLASH1970]

If your gauge is way off as you stated it might need a recalibration, then that would mean the global would be off. Meaning, it is reading really low. This would assume that your idle is fine and your afr on the wot pull is lean. If that was the case your global would be set to low. In order to correct it you would have to raise it. But I guess thats a what if question.

I'm going to recalibrate my wideband and do another boost leak test just to absolutely make sure... again.

And an EVO is just a DSM with 2 extra doors and less curves... Well, unless it's an X.

 

[livedsm4g63]

And an EVO is just a DSM with 2 extra doors and less curves... Well, unless it's an X.

Not even.

 

[FLASH1970]

Not even.

ok ok... there's one or two other things different and the engine is rotated 180 degrees making it fancy.

What I thought to be just air going by the throttle plate was actually bad throttle body shaft seals. Before it wouldn't hold more than 7psi on my BLT. After I did the #7 o-ring rebuild my boost leak tester popped off my turbo compressor at 12psi. And there was some RTV had gummed up most of the hole for the BISS screw on the intake manifold side of the throttle body. So I'm going to retune and see what I come up with.