Problem Tunning For New Cam

[shakinlm7]

Maybe it would be easier for someone to look at this pic and tell me if I have my timing chain set up to run the cam 4* advanced. I don't have a picture of exactly how its set up but its pretty close.
The crank timing gear is spun so the key is one notch to the left of tdc when your looking at the pic. Instead of how it is in the pic where it is spun two notches to the left of dtc. The dots on both sprocket teeth are lined up perfectly and I know it is not 180* out.

[shakinlm7]

Does anyone else have any advice?

[Chalky]

Did you look @ IFR, B4001? Yours is flatlined.

[joecar]

Maybe it would be easier for someone to look at this pic and tell me if I have my timing chain set up to run the cam 4* advanced. I don't have a picture of exactly how its set up but its pretty close.
The crank timing gear is spun so the key is one notch to the left of tdc when your looking at the pic. Instead of how it is in the pic where it is spun two notches to the left of dtc. The dots on both sprocket teeth are lined up perfectly and I know it is not 180* out.

I'm no expert, but wouldn't that retard the cam instead of advance it (if the dots line up)...?

[Chalky]

Joe:

I use the same timing gear setup. His cam looks OK. Moving the crank gear to the right advances the cam. Usually, every keyway is 2*.

[joecar]

Joe:

I use the same timing gear setup. His cam looks OK. Moving the crank gear to the right advances the cam. Usually, every keyway is 2*.

Oh I see... :idea:

let's see if I understand it:
the crank sprocket is installed to the right (when crank itself is at TDC),
then when sprocket dots line up, crank is before TDC, thereby cam is advanced...

Thanks for the education...

[Chalky]

Oh I see... :idea:

let's see if I understand it:
the crank sprocket is installed to the right (when crank itself is at TDC),
then when sprocket dots line up, crank is before TDC, thereby cam is advanced...

Thanks for the education...

I cheated and had to go back and look at some pics. The gears sets make it easy though by showing +/- 2-4-6 degrees.

[shakinlm7]

Did you look @ IFR, B4001? Yours is flatlined.

Thats how it is on the stock tune for my truck and I am still using the stock injectors, rail, and fuel pump. From what I see on the VE table it looks like it uses less fuel at higher RPM than it does in the mid range so that might have something to do with it.

[shakinlm7]

I found a picture of a ls1 timing chain that showed advance numbers on the key ways and on the sprocket teeth. The first time I started my truck after the cam swap the timing chain was as pictured above. It ran REALLY bad! I would give it 100% throttle and it would barely run. Thats why I think I might have it wrong......

[Chalky]

My guess is that cannot be right. I am no auhtority but every IFR table iI have seen is not a fixed value. Did you see if there was a similar tun in the repository?

When I looked at you log file, your idle is at around 45 KPA and your OlCF table goes to 13 or so @ 55 KPA. You also run into big KR like 8* KR at pretty much anything off idle when adding throttle and your timing tables are not that agressive.

Could anyone have alterd your tun prior to you getting your vehicle?

how big are the injectors? If you know, you can run them through one of the available spreadsheets and change the values.