ChopperDoc

Do you have a DBC or DBW throttle body?

Avery Marchbank

I have DBC

ChopperDoc

What are your IAC counts doing?

Avery Marchbank

iac position?

ChopperDoc

Yes, log IAC position, idle desired airflow, and dynamic air. Once you have those logs we can go from there.

ChopperDoc

I've been meaning to make a video on how to adjust the counts, has a profound effect. I'll give you some stuff you can try first though before we get to that.

1. Get the car HOT (in your driveway) by turning the fans off with the scanner. Looking for about 230* (don't let it overheat. Just log the counts, and shut it down, so on...)
2. Note IAC counts, should be in the 20-50 range. Lower the better, but NOT zero.
3. If counts are not in this range, adjust throttle blade slowly in the direction needed. Closing blade increases, opening decreases.
4. Reset IAC and TPS between adjustments by unplugging them both with the key off, turn key on, count to 5, key off, plug back in.
5. Once you have the counts in the low range with the ECT of 230* or so, you're done... For that part lol.
6. Do a COLD start, in the morning, don't touch the throttle if you can avoid it. Log counts.
7. IAC should settle somewhere around 40-80 counts depending on how low you got the hot counts.
8. If you still have issues, I will be making the video soon as to how to use the scanner to adjust them. Don't just slide the table like many say to do. There's math, and math is our friend.

ChopperDoc

Oh and idle uses Dynamic Air for calcs. That comes from the VE table, so all of this is for nothing if your VE is jacked up. Make sure that's on point, +/- 2 or so in your idle areas.

Avery Marchbank

ill definitely be giving this a try tomorrow! Thank you!

dw456post

Go to DTC's and make P0106 No Error Reported and uncheck the box. Go to Engine---Torque management --General--ETC limits and make the whole table 100 except for the first 0 row across, leave it zero, and see if that gets rid of the 106 error.A big cam will give you the 106 error.

qweedqwag

What's a big cam to you? Just curious.

qweedqwag

ChopperD.

Awesome video on adjusting the VE table, it's nice when things are explained in layman terms so the masses get it. Thanks for all your help here I for one appreciate it.


Mike.

ChopperDoc

Thanks man. I like helping people out whenever possible, and I would hope that is the goal of most on this forum. I'm glad you liked the video. It's more for new tuners to get their feet wet. I plan to make some more, soon.

qweedqwag

That would be me, I'd like to see a video on adjusting iac counts,, mine is around 80 at hot idle, would liove to understand exactly how it works, its like a choke yes? The higher the number the more air coming thru the iac with the blade closed, lower number less air? Right on with the right on.

Mike

ChopperDoc

I will definitely do that. Won't be a super long video, just one on setting up the table, and the user math to make it work. The adjustment is manual in the table. No copy and pasting on this one. But you are correct. It's very much like a choke. It's really "bypass" air that is allowed in around the blade. Higher the count, the more air is being let in.

80 is good for hot counts on most engines. If it starts and warms itself up cold then it's good to go. No need to take it down farther. It needs the range for those super cold days where it will be maxed out trying to get enough air in. Obviously as it warms up the counts come down as less fuel is needed, and air pressure increases and volume decreses through heat. 90% of getting it to work is in adjusting the throttle blade. The other 10% is playing with the idle adaptives, RAF, idle RPM's, spark (idle only) and finally the IAC effective area. 100% of it will not work if the VE is jacked up though lol.

Idle tuning is one of those things that can drive you plain nuts sometimes. Patience is key. Getting a 297/305 cam to idle in my car cold through a 102 TB without pedal was a BEEEOTCH. I have a deep understanding of some of those tables now. LOL. In all honesty I still need to crack the throttle to start it (just while turning it), but it's good from there, even if it's freezing.

qweedqwag

I'm running a 242/248 with a 90mm tb with a 90mm Wilson intake, car definitely starts better about 60 degrees. I've been working on the TCC settings now, it's been interesting but I need more training on that, but that's another story. Car is running good at the track 1.65 60 foot times and 7.3 in the eighth, trans runs warm after driving around town but I got help saying I needed to bring my fans on earlier, I'm am going to try, running trans fluid through the rad and my additional cooler in front of the condenser hope it helps, it's hot here in Texas in the summer.

ChopperDoc

qweed, (or whomever lol) finished that video. Here is how to set up and adjust your IAC counts, correctly, based on your VE settings.

https://www.youtube.com/watch?v=621b...ature=youtu.be

RonSSNova

iTrader: (3)

C5 Corvettes are DBW unless for some odd reason this car was converted to a mechanical DBC throttle.
I’ve never heard of this being done unless it’s a pure race car......

Ron

ChopperDoc

That is why I asked. But with all the mods we do to our cars, had to ask. You never know. DBW is usually easier to tune honestly. Not as many factors to take into account since it's just the blade the computer controls, and not the IAC, which can be a real pain since blade position has to be manually adjusted.

RonSSNova

iTrader: (3)

Correct!

qweedqwag

Thanks man makes perfect sense when someone explains it, I have so much to learn in tuning seems endless, appreciate the vid, you one smart cookie and we are lucky you're here.

Mike.