new cam tune
This is a discussion on new cam tune within the Computer & Tuning forums, part of the LSx Technical Help Section category; im running hp tuners software, where would you guys start tuning. 220/224 112lsa, ported 241 heads, and 2800 stall. car ...
01-11-2009, 11:13 AM #1
new cam tune
im running hp tuners software, where would you guys start tuning.
220/224 112lsa, ported 241 heads, and 2800 stall. car starts and idles great, revs great....but going down the road when coming to a stop it dies.
i bumped the idle to 1000 rpms to get good idle. do i need to go higher?
01-11-2009, 12:34 PM #2
Need to increase the base idle airflow a bit.
The most accurate way is to histogram it from a cold start, but just adding 1 across the table will probably help the stalling.
Need to probably increase the idle timing too. That will help with the idle, and return to idle.
You should start by reading the help files. You'll get your best results from speed density tuning it. There's a help file for that too.
01-11-2009, 03:19 PM #3
im running an SD tune right now, so i can adjust it for my new setup....lol i know just enough about it to really screw things up....thank God i save every time so i can reflash my old tune.
il sit down and read about the histograms
01-12-2009, 11:14 AM #4
yep, start with the idle histogram and get your base tables nailed down then go from there. Where is your timing at idle now?
01-13-2009, 12:37 PM #5
but on a good note i did get it to idle pretty good and played with the fuel and timing alittle with 0 knock retard
01-13-2009, 01:52 PM #6
do you have a wideband to tune with? If not I would put that at the very top of your list of things to buy. It really helps out a lot and is definitely worth the investment especially when you start doing your part throttle and wot stuff.
01-14-2009, 04:57 PM #7
01-22-2009, 02:46 PM #8
01-22-2009, 04:27 PM #9
01-22-2009, 04:35 PM #10
01-25-2009, 07:34 PM #11
01-26-2009, 02:14 PM #12
02-03-2009, 01:13 AM #13
cold idle speed is set at 1015 rpms and drops off to 850 rpms full temp idle.
also right now I have my SLP (yes I know) MAF hooked back up with the SLP calibration table from another guys car. I was running in SD before, should I just unhook it and run SD again.
if I unhook it, and set all MAF tables to 0 and set maf failure codes to (3) no error no report will that let the car run good and stop codes from popping (to get it through emissions)
before I just unplugged the maf and had the code set to (2) no mil light
02-03-2009, 08:11 AM #14
Dude I have been reading and reading about this crap for weeks now. Mostly what I have realized is without data logging you will probly never get the tune correct, close maybe. Run the stock MAF and stock MAF table all the pro's can't be wrong. The SLP MAF should be the same size you have stock, right? one main issue is the cam (112lsa) is lowering the manifold vacume. I needed to raise the idle air flow a bit. got my idle @ 750rpm hot, no stalling and fairly smooth. (My cam has a step more duration). Sorry if I just told you every thing you already know. I still have more work to do though. I will probly have it done by a real pro before it hits the streets/track for the summer though. I just want it to run and get on a trailer to the dyno
02-03-2009, 08:25 AM #15
i have mine down to 850 hot, and im sure after i do some more tuning i can get it back down alittle lower.
ive been doing some data logging, but been very busy....this weekend is me and my car time
was i able to help you out at all the other weekend?
02-03-2009, 08:46 AM #16
02-03-2009, 09:57 AM #17
what does your idle air look like? Have you added any timing to your idle? That made a pretty substantial difference in how smooth my car idled when I was doing mine. I went into the vcm controls and manually added timing a degree or two at a time until the idle smoothed out. They used to say until the map pressure bottomed out but that's changed over the last year or two so now they say not at the bottom of the map but a few degrees before. I found my idle to be best at 23-25 degrees. Before you worry to much on the idle timing I would get that RAF table worked out.
02-03-2009, 05:01 PM #18
i added 2 acrossed the board for the idle air, added i think 2 degrees to idle spark to get it to idle good. took my ltft adjustments, copy\paste special, and multiplied by 50% one time.....now going to data log on the way to work tonight again.
i ordered my wideband o2 today from lsxtune.com so that will help too!
RAF table or do you mean MAF table?
02-03-2009, 05:14 PM #19
You're spark should bounce around at idle. It's using it to try and stabilize the idle. It reacts faster than the IAC.
For tuning the fuel tables, just disable your long terms in the tune, and run off the sort terms. It will make things go much quicker for you. After you get everything in line, then you can turn your long terms back on, and see what they do.
02-03-2009, 05:18 PM #20
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