Also are you running a colder plug? I run BPR8ES in my DSM (same as most evo 8 guys run) and my car is undriveable in 50 degree weather when cold. Even when warm it bucks and sputters till I get some heat on the plugs (a quick pull to warm the head up) and all is fine. I would be running stock plugs in an E85 car for up to 100whp more than stock etc....

 

also, the car seems to run fine once i get it going, but when i start it up, it idles fine, but if i try to drive without waiting 5 mins or so, it will run rough, and actually bucked on me twice when I pulled out of the parking lot at work.

Once warmed up though, everything seems fine, but im keeping it out of boost for the time being. Only odd thing ive noticed is that I get throttle hang now, and actually the rpms will rise slightly before falling when i hit the clutch. (ie if i shift at 2.8k, it will rise to 3k, and slowly come back down.) Im thinking this has to due with the fueling issues, and im not looking to mess with my BISS to raise the idle until i get these kinks worked out. As a test, i enabled the SAS actuator, and the idle fell to 500 or so. On 91, it would fall to 850 with stock idle settings as it should have.

Gonna get some sleep so i can go tuning all night. Ill post up the results.

 

Swap out the plugs to some fresh stockers. Thats exactly what mine does with E85.

 

I am running stock IX plugs, gapped at .019

hopefully richening the injector settings a bit will bring my car back to life.


Driving with Hippy juice and no boost sucks!

 

Ill try that out if i dont have any luck tonight. my plugs only have 15k on them and look fine, so they shouldn't need to be replaced yet.

 

Excellent...definately on the right track. Car feels 10000x better. Thanks for the tip on the STFT Bryan, saved me a lot of time getting the car to idle smooth. It took less than 10 minutes after letting the car warm up to narrow down the trims.

After playing with the 14v latency, I ended up with .984, which resulted in the STFT bouncing around between +/-10.

I logged my trims during a 20 minute drive which resulted in a mid of 12.6512.

Unfortunately my battery was running low, so I had to end for the night. Do I need to increase or decrease the 14v latency to add/remove more fuel? It's late and I'm getting confused.

Thanks for the input so far guys, my car and I deeply appreciate it!


Initially, I was so frustrated with the car not running properly, I would have never thought to log the fuel trims, (which in hindsite is a pretty obvious step to see what was going on)...I was just seeing red that it wasnt working as I'd thought it would. I had read through the forums and thought there were only 2 things to do 1) fill the tank with e85, and 2) decrease the scaling by 30% and the car would fire up and she'd be ready to rock 29psi all day long. I should have known, life is never THAT simple

 

Glad the car is running better, but since your LTFT mid is now at 12.xx, you still have some work to do. You'll need to work on the latency and injector scaling values until both the low and mid trims are hovering around +/- 4%. This is sort of an arbitrary number, a little looser is ok, and a little tighter is better, but it won't really help the car run any better.

Where is the LTFT low? A LTFT mid indicates that the injector scaling needs to be decreased (which increases fueling).

What do you mean by a low battery?

 

my laptops battery was low, so I had to head back home to recharge.


I went out logging again last night after my last post. I had bumped the scaling from 573 to 562, but the mid still stayed at 12.6512, is this a maximum value?

I havent logged the low trims yet. Gonna see where that trim is after work today.

 

It would be a good idea to log ECU batter voltage as well. This information can be used to determine what latency values are playing a role.

12.65 is the max. Post your current latency and injector scaling values.

 

i am logging the battery, came in useful when i first scaled my injectors for 91.

Currently scaled at 562

latency table:
4.68 5.496
7.03 3.408
9.37 1.704
11.71 1.176
14.06 0.984
16.40 0.504
18.67 0.336

 

ok, so on my way to work today, I got a CEL p0171: Engine Lean; so i took this as a sign to decrease the injector scaling before testing tonight.

I recorded the idle trims for 20 mins, and cruised for 20 and came up with a brain tickler:

idle -11.5, cruise +12.65

To my understanding, this should not be possible unless something is physically wrong with the fuel system. I am now thinking I either have a clogged injector or fuel pump filter is clogged or is not in the correct position which is impeding fuel flow. Does this seem feasable?

My tank is on E right now, I am thinking I will fill up with 91 for now till i get this issue solved, and save the 5gal container thats in the garage till i get my trims/fueling issues solved.

 

no your latencies are off.

look in the injector scaling thread - page 5... Erics howto.. You will either need to increase or decrease your 14v latency.. Assuming you are running 14v @ cruise and idle..

 

idle is 14v, cruise is between 13.75-14v.

If I were to increase the latency, wouldnt that cause the idle trim to go further into the negative, and the cruise to move closer to 0?

I've read that thread before the first time I scaled my injectors on 91 a few months back, i didnt think a spread this large would be possible!?

I'll read that thread again to refresh my memory...maybe im just forgetting something here!?

 

I am maybe a little off - but shouldn't this be then dialed with MAF scaling (it is load based) so better separates the idle part vs cruise part.

 

You indeed have a lot more work on your latencies and possibly overall scaling number. Here is a condensed "note" that I use as a reference from time to time when I am having problems just like yours. Use this, and you will get it right:

1. Choose an ECUFlash injector scaling number
2. Log trims at idle and cruise
3. If trims are roughly the same, but positive, then you need to lower your injector scaling number.
4. If trims are roughly the same, but negative, then you need to raise your injector scaling number.
5. If idle trim is more than cruise trim, then increase the dead time by increase the latency value.
6. If idle trim is less than the cruise trim, then decrease the dead time by decreasing the latency value.