unfortunalty PE table mode still allows the use of long term fuel trims which will eventually cause the idle to go way rich again regaurdless of the BLM locker. IF you have a big cam running an open loop tune is your best bet, sicne you have a wideband like I do tuning should be easy. I have a big cam and use open loop mode only, I

 

THere has got to be a calibration for force open loop...

 

Ok guys, I had some success today. Thanks Highlander for the latest version of the EE def file. After receiving the def file, I set the STFTs to max out at 132 and fired her up. Ureeka. the STFTs rose quickly to 132 and held there. BLM locker held BLM at 128 and a combination of MAF calibrate and PE fueling table allows me to run about 18 AFR on the wideband. I can make the car PE idle so lean that I start to get surge. The only side affect is that the PCM will throw a engine lean code after a timer times out. This takes about 60 seconds or so of lean idle. When the code is thrown, is jumps to Open loop idle. This does not really pose much of a problem if the MAF table is tuned pretty well. As soon as you blip the throttle and go out of PE, and the code clears and SES light goes away. Seems to work like a charm. Now I need to figure out IAC follower stuff since I'm close to stall when I come to a stop and it takes about 10seconds for IAC system to kick in and bring idle back to my programmed 950. So for me the STFT's in the latest revision of TC EE TDF file seems to work fine.

Steve

 

i understand now my appoligies

you can limit the short term with tuner cat. you can give them a paramiter say nothing lower than 125 and nothing higher than 135 and you can do the same with long term.

 

yes you can

 

ooo, ooo, please, send it to me!!! (tunercat upgrade)

Also, if you don't mind, send me your tunercat file for the cc306 cam also. I know I have to tune it to the car, but this will give me a starting point. I have 2 cars (one cc306, the other GM 847) and these will be my first cars to tune in open loop idle.

God I love this post

D Moss

dmoss69@yahoo.com

 

I can't just send you the TC latest revision. You'll have to get it from TC. Highlander was kind enough to Email me the files after Emailed him my old EE def file as proof of ownership. Thanks Highlander! Maybe he would do the same for you.

Also,

I'll gladly send you my CC306 file. It runs pretty well in my car, except the IAC follower stuff. That being said, I always issue a disclaimer. Be friggen careful! Every car is different. What works in mine, may run like crap in yours. I take no responsibility for damage or other problems that may be caused by running my file.

Steve

 

Great!

I'll contact tunercat for the upgrade. He knows that I have purchased his program.

Send me your file at dmoss69@yahoo.com

Thanks

D Moss

 

Well I just got around to trying this method of idle tuning and I must say it definitely made a difference. I no longer smell of gas when I exit my car BUT sitting in the drive-thru to give it the real test, I noticed there was still a smell but an odd smell. Idle timing is around 26-28 and previous BLMs were in the 135 range so now locked at 128 Im assuming the afr is considerably leaner. so my question is...

Now how can I ensure im not running dangerously lean now that I will be going from open loop.. VE calcs to PE calcs instead of basic closed loop? To be honest there are so many variables Im almost afraid to let it idle for too long. I really dont even know where to begin w/o $$$ instruments like what Christian was talking about.

On a side note I now realize I made a mistake dyno tuning my car because I ran it RIGHT after reflashing the pcm so I cant see any possible way the PE table was being used during the run... damn.

EDIT: after driving around some more I have realized the car definitely idles better... probably just b/c of even fueling. Also, It will pull in 1st gear off idle by itself(no foot on the gas) with less surging than I have ever experienced! Only problem is that it does unfortunately smell pretty rich still. I am aware it will never be like it was back in the stock cam era but i think there is still a lot of room for improvement. Like I said the only problem is that even though closed loop blms were 136ish before... now that the car is locked at 128 in PE mode.. that doesnt mean there is less fuel being supplied. Would it be a good idea to unlock the BLMs in PE mode and then try to aim for a little above 128 before I decide to lock them at 128? For all i know they could bottom out at 108 if i let them.

 

Well i just tried to turn off the blm blocker but had no luck so i started with a new file and just moved all my changes over to it... still no luck. I cant seem to get cell 16 to move off of 128/128 now. I thought given enough time there is learning in PE mode however I see absolutely no change going on. what gives? what am i missing here?

 

BLM locker should lock your LTFT (left & right) at 128 while PE is enabled. STFT's will be controlled by the Tunercat STFT limit settings. STFTs will adjust while in PE. Do you have Datamaster set up to verify that PE is enabled at idle? IMO it's unlikely that you can get too lean at idle and hurt your motor. When you start getting way lean it'll start to surge an you've gone too far. If your PE TPS vs RPM table is set up right, it'll kick out of PE and into normal closed loop learning as soon as you touch the throttle. Then it'll go back into PE if you really stab the throttle. Mine still smells a bit like fuel as well. With large overlap cam thats probably a fact of life. I'm gonna start workling on the timing table to try to get peak vacuum at idle. Then back to the PE (idle) table to go way lean and then add fuel as i watch vacuum.

Good luck guys

Steve

 

Anyone care to comment or do I misunderstand something. Would enough fuel be in the overlap to ignite the extra air

 

Where's the BLM locker? I have tunnercat.

D Moss

P.S. Oh yeah, I just got the newly updated tunnercat EE file also!

 

Actually for those wondering I dunno, but leaning out idle in closed loop is now possible with new tunercat, I've been running it for a few month now, I have my idle running leaner, I need to go to a shop and have read my CO to determine if I need to go leaner or richer as CO shouldn't be affected by extra oxygen/fuel comming out, cuz CO is a byproduct of combustion.

Whats funny though now in closed loop when I come to a stop, if I hang around about 1-2 minutes idleing I throw a lean code cuz the o2's are reading lean LOL since my idle is leaned out, then the pcm goes into open loop, but I have my open loop tuned to lean aswell, I have both my closed loop and open loop reading 200mv on the o2's, i think she likes it there, so even when I'm ideling for a while in closed loop and throw a lean code having the PCM go into open loop its still running the same, then as soon as I start moving and press the gas she gets back into closed loop. Works great. I can prolly log it and post it so everyone can see my lean idle in closed loop causing the car to be forced into open loop at idle lol.

 

I'd like to see that log. What are your cam specs if you dont mind sharing? Is it solid or hydraulic? Are you using the VE tables to tune for closed loop?