Anyone have a timing table they can share for a good size cammed LT1/LT4 motor?
I've just installed a GTP6 cam with 114 LSA, 236/242, .597/.583 lift.
Mainly want to see what to do with the idle timing, currently its been advanced 4 degrees across the board from the stock tables which does not seem right. The shop that installed the cam did this, but if I compare it to my trucks LT4 timing at idle, its alot higher and the cam is quit a bit smaller in the truck.

Just trying to get an idea if I should advance it more for a bigger cam than what it is already for better idle quality.
Thanks

 

is it hard to get people to help out with spacific questions???? like the timing thing or is it that not to manny really know?

 

25.0 25.0 25.0 25.0 25.0 25.0 24.0 24.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0 20.0
25.0 25.0 25.0 25.0 25.0 25.0 25.0 25.0 24.0 21.0 20.0 20.0 20.0 20.0 20.0 20.0
27.0 31.0 31.0 31.0 31.0 31.0 29.0 27.0 25.0 23.0 22.0 21.0 21.0 21.0 21.0 20.0
32.0 35.0 35.0 35.0 34.0 33.0 31.0 29.0 28.0 26.0 23.0 22.5 22.0 22.0 22.0 21.0
34.0 37.0 37.0 37.0 37.0 35.0 33.0 30.0 28.0 26.0 24.0 23.0 23.0 23.0 23.0 22.0
35.0 39.0 39.0 39.0 38.0 37.0 36.0 35.0 34.0 32.0 30.0 28.0 25.0 25.0 24.0 23.0
35.0 40.0 40.0 40.0 40.0 39.0 38.0 37.0 35.0 34.0 32.0 30.0 27.0 29.0 28.0 28.0
35.0 40.0 41.0 41.0 41.0 40.0 39.0 39.0 38.0 37.0 35.0 33.0 30.0 31.0 30.0 30.0
35.0 40.0 43.0 43.0 41.0 40.0 39.0 39.0 38.0 38.0 36.0 34.0 33.0 35.0 33.0 33.0
35.0 40.0 43.0 43.0 42.0 40.0 40.0 39.0 39.0 38.0 36.0 35.0 34.0 37.0 35.0 35.0
35.0 40.0 43.0 43.0 42.0 41.0 40.0 40.0 39.0 39.0 37.0 35.0 35.0 38.0 36.0 36.0
35.0 40.0 43.0 43.0 42.0 41.0 40.0 39.0 39.0 39.0 39.0 37.0 37.0 39.0 38.0 38.0
35.0 40.0 43.0 43.0 42.0 41.0 41.0 40.0 39.0 39.0 39.0 37.0 37.0 39.0 38.0 38.0
35.0 40.0 43.0 44.0 43.0 42.0 41.0 41.0 40.0 39.0 38.0 37.0 37.0 39.0 38.0 38.0
35.0 41.0 43.0 44.0 43.0 42.0 41.0 41.0 40.0 40.0 39.0 38.0 37.0 38.0 37.0 37.0

Here's what the table looks like for an LE2 cam wich is comparable to that cam and the cc306 cams. This is a direct copy and paste of the main spark advance from the tunercat "main spark advance" table.

 

sweet this will help me out alot. thanks bro

 

Thanks alot! I'll start comparing with what I have when I get home. I've already tweaked the timing some as I was getting alot of knock at 1600rpms under lite accel, cured it right up, now I'll see what happens with idle quality coupled with a bit looser convertor.

 

let me know how it goes i am going to put the cc305 in soon and that is going to save me so time for sure. thanks again. sorry i jacked your post

 

You want idle timing? Then you're using the wrong table. You need to adjust the "0% TPS timing" (or something like that) table. For a cam that size, I would say you need like 30-34* at idle. A trick to know where the perfect idle timing is, is to add a degree at a time until you find the spot where the car is pulling the most manifold vacuum (lowest MAP value). Also, with 40-43* of timing at cruising rpm's, my car surged quite a bit. You have to remember that the car will add 2-3* to what is read in the table. I'm running a little less than that. My cam is similar in specs to a gm847 if that helps.

 

Yes idle timing for now.
I thought it was all in the "Main Timing Table", just changing the timing at the idle rpm and KPa value that is at idle. Seems like there is a 0% TPS table but I thought that was only used for decelleration when coasting when there's no load and it only added and subtracted a value from the main table entry. I'll see what I can find with it.
At cruise / steady throttle position the timing is around 33-37* and thats total after temp correction etc.
Thanks for the info, I'll see what the other table does

Sean, sorry, I haven't had time yet to compare the table above and determine any results...having some other issue that cropped up with a bunch of false knock and a strange grinding noise coming from the front...hopefully just a pully bearing fried.

 

The 0% TPS Timing table is used for idle. Not sure if it's used for decel, but I think it probably is. It has no affect on the main spark advance table or vica versa.

The reason I mentioned 40-43* at cruise rpm's is because that is what the timing table posted above has. It may be a bit too much for you. Like I said, I had more surging with that much timing.

Also, what is a temp. correction for timing? I don't have TunerCat in front of me, but I didn't think timing was temp. related.

 

I don't have it in front of me either, seems like there was another table for timing vs coolant temp or IAT so that when its hotter it takes out some timing. I know there was a table similar for this for PE fueling..or maybe I have my PCMs mixed up and I'm thinking of the GN stuff. I'll look and post back later tonight.

 

Found it, its "Spark Correction vs MAP vs Coolant Temp" in Tunercat EE file.
My "Closed TPS Spark" is at 35* up to 1200 rpms and then goes to 39* for 1600-2400 rpms.

 

Here's my current Main Spark table, it seems to be alot lower than the one posted above and I already took 2 degrees out at 1600 and 4000 rpms due to knock.
Also, I can't tell where the idle spark comes from, at idle on Datamaster, the over all timing is alot greater than whats in the Main table at the KPa and rpm which is about 850rpms and 60 KPA, timing is about 34-37* it fluctuates alot just with a slight rpm change with 0% TPS. My 0% TPS table is as stated above, 35* for that rpm range.
here my Spark table
18 18 29 30 30 28 26 26 22 22 20 16 14 13 13 12
26 26 29 31 31 31 29 27 26 23 20 18 15 13 13 12
29 33 34 33.5 33.5 33.5 31 28 24.5 21.5 19 16 14 13 13 13
34 40 41 37.5 34.5 33.5 32.5 30.5 25 22.5 20 16 14 13 13 13
36 42 39.5 38 37 35 34 31.5 26.5 24.5 22.5 18.5 16.5 16 16 16
39 44 43.5 42 40 38 37 34.5 30 28 25.5 22.5 24 21 18 18
39 45 43.5 43 42 40 39 35 31 30.5 27 23 24 22 20 20
39 44 47 47 45 42.5 40.5 38.5 33.5 34 30 24.5 25.5 23 25 25
39 44 47 45.5 43.5 42 41 39.5 38.5 37 33 30 27 26 26 26
39 44 47 45.5 44.5 42 42 41 40 39 36 33 28.5 27.5 26.5 26.5
39 44 47 45.5 45.5 42.5 41.5 40.5 40.5 39 37 36.5 32 29.5 29 29.5
39 44 47 47 46 44.5 43.5 42.5 41.5 39.5 38.5 37.5 36.5 35.5 33 34.5
39 44 47 47 46 45 45 44 42 40.5 39.5 39.5 38 37 33.5 34.5
39 44 47 48 47 46 45 45 43 42 41 39.5 39 36.5 34 34
40 46 48 49 48 47 46 46 44 44 43 41 40 34 32 33

hope that comes out
well, thats about as good as I can get it in here

 

I don't like that timing table at all. The one above is a much nicer table. Mine is similar to the one posted first, but I have a little less timing at cruising rpms. Your table starts with WAY too much timing and doesn't end with enough.

 

Probably does have too much, basically the tuner added 4* across the entire table from the way it was previously tuned which was my own little tweaking.
I've already taken some out around the 1600 range because of knock, and didn't even think about it being the range where it surges too.
As far as ending with not enough, I already had some knock at WOT at 4-4500rpms and took out 2*. Also, the heads have been machined which would bring the static CR to 11.2 to 1.
I'll be using the previous table above for cruise and see how it turns out, then start looking closer at WOT.

 

If you can't run the (first) table above without getting knock, then there might be something else wrong. Like I said, that's similar to my timing table and I have a higher SCR than you do. You're never going to see the potential of that cam running 33-34* at WOT.