How do I control the timing in the 165 above 4800 rpm? Can I?

 

I think the timing map is the same from 4800 and up. Can't change it.

Jason

 

I am not shure on this but cant you add more timing on the LV8 table at 208. Then as the LV8 falls to 192 you can add more timing there. eg. 4800rpm(LV8=208) spark=35 degrees. then at 4800rpm(LV8=192) spark=37 degrees.

I thought I had a bud experimenting with this.

I belive the Lv8 will fall off as the RPM's go up. MAF gms will be maxed out but the LV8 will lower.

Dennis

 

What would you want to do?.
Add more?.
Why?
If you have to or think you do, run a MSD retard that is always on at the lower rpm, and only off at the points you want the extra timing.
BTW, I've never known anyone that needed to.

 

Isnt there a address that relates to spark andvance after 4800rpm , I know there is in the $5D ,I am sure if you did a data log of a full power run you will see that the timing does not stay at a limit after 4800rpm

 

You have a location for that?.
The 5D has just about nothing in common with the USA chips.
Would have been nice if they included the US diagnostics so it would have caught on as an alternative here. BTW, I posted kinda a hac to it at the DIY area, and it should be in the archives.

 

Just wondering what to do if I find a knock after 4800.

 

Grumpy the location for the HI ADVANCE RATE on a $5D program is at $002D
It relates to advance/1000rpm

I heard that someone on the gmecm list was porting the 808 to have high speed diagnostic interface , havent heard any update for a while though

Daniel
DOWNUNDER

 

If it's who I think it is don't hold your breath. You'd have to use a 165, or add a chip to the 808 for the high speed ALDL as far as I know.

 

"What if's" are a way for a mind to wonder. On some later stuff they reduce the timing a couple degrees, but it's more a matter of reducing engine failures. 99.9999999% of tuners have this silly notion that more timing always means faster, and it don't. You can get to a stage of having so much fuel and timing that your no longer really relying on spark for ignition, rather you've crossed over into autoignition (diesels). the results short term can be fun, but long term, engine failures.
If you have detonation at over 4,800 you've just over done the timing, or out run the resolution of the MAF, for fuel. Pegging the MAF can bite you, but you mentioned timing.