luv2spd

iTrader: (1)

Hey guys. I just got my torquer cam installed and am starting to tune it. What all do i need to adjust to get my car to pull itself along in first without all the bucking? At the time my idle was at 825. I'm gonna try raising it to 900 and also increasing the idle air some more. Would this put me on the right track? thanks

HumpinSS

iTrader: (1)

reduce the ve table at 400-800-1200-1600 by 60-80-90-90


Also check www.ls1tuning.com and chech the idle forum

luv2spd

iTrader: (1)

I already did the 60-80-90.

HumpinSS

iTrader: (1)

Usually bucking is caused by a rich condition. So try decreasing a little more and see what happens

luv2spd

iTrader: (1)

Ok, thanks. I will try that this weekend and post the results!

P Mack

iTrader: (6)

I still had bucking after I lowered the ve table at low rpms, but when i hand smoothed the ve table in that area it seemed to help a whole lot.

luv2spd

iTrader: (1)

Could you post a screen of your ve or send it to me? thanks

P Mack

iTrader: (6)

It still needs a lot of work, especially at high MAP, which i can't even get to at this altitude (7000 ft). I think the sharp changes I had before in the lower rpms around 40-60 kpa was causing the bucking.

P Mack

iTrader: (6)

This is what I had before smoothing.

2MuchRiceMakesMeSick

Combination of timing and a rich condition causes this. I am currently learning how/what to do to fix it.

P Mack

iTrader: (6)

Too much timing or too little timing? Or timing tables that aren't smooth? I have almost no bucking now but if i could get rid of it completely by tweaking timing that would be awesome.

Have any of you mafless guys noticed less bucking than when you had the maf?

The Dragon

iTrader: (6)

Reduce your timing ~3* from .08 to .32 in the offending rpm's in your timing tables. Might need a degree or two less.

luv2spd

iTrader: (1)

So I should try reducing the ve and cutting some timing?

luv2spd

iTrader: (1)

to the top

2MuchRiceMakesMeSick

Let us know if that fixed it, ttt for now

The Dragon

iTrader: (6)

If you're asking if you should lean out your ve, than you need to log your car again and make sure your Lterms are where they need to be at part-throttle. Once your Lterms are in line, then modify your high/low octane tables as I posted.

luv2spd

iTrader: (1)

Well, I didn't have a whole lot of time to mess with it. I tried a tune where I leaned out the ve some more and pulled 3 deg. of timing from 1200 on down in the ho table. It almost seems like it bucked worse than it did before. On the histogram, all the low rpm regions indicate lean, but it still surges at start a little bit. It's worse with a cold start but it still surges a little with a warm start. I haven't done anything with my throttle blade yet. Would it make a difference if I opened that up some to get the iac down to a lower level? Also i have my running airflow at like 9.2. How do I know how far to raise that?

P Mack

iTrader: (6)

Open up your throttle blade based on your IAC counts. If you open it up until you see about 35 that is a good rule of thumb to keep it from surging, but each car seems to like a different number to get a good balance between surging and the cruise control effect.

Just make your desired airflow equal to what you see at idle. That's not really that important because the pcm learns how much airflow you need to sustain your idle speed regardless of what you set your desired airflow to. It will help if you unplug your battery or something cause it won't have to go as far to relearn the idle trims.

luv2spd

iTrader: (1)

I've heard that the ltrims don't mean much at idle. Or are you talking about the trims above idle speed? Also, do i lean out the first three columns until the surging goes away? I did like 55, 65, 75 and it still surges, but that may be b/c i haven't opened the tb blade as mentioned earlier. My trims look bad in the histogram. They are like 7-10 in the idle range. This would indicate lean, but i don't know if should go by those for idle a/f tuning? thanks for helping me out guys!

P Mack

iTrader: (6)

The throttle body should be the first thing you change in my opinion.