Set up for increased displacement?

[Sub8]

Hi all - my LS7 in my 2009 Z06 failed late last year.

I`m just about to start assembly of my new HPR 468cid shortblock and flowed heads.

Q - What base settings should be changed to account for the 10% increase in displacement? I`m aware of the cylinder volume parameter, are there any others? Anything in the idle section I should do in advance?

I had mapped the car prior to failure (not related!!) and so have a known baseline.

I will be starting with std MAF sensor still and the standard throttle body.

Thanks all.

[rhighfil82]

I just went through a rebuild with more CI and bigger cam.. Bump your idle upto 1000-1200 while doing your maf and speed density..

Also under Idle>Airflow
You may need to double the Percent Max values.

[jsllc]

Hi all - my LS7 in my 2009 Z06 failed late last year.

I`m just about to start assembly of my new HPR 468cid shortblock and flowed heads.

Q - What base settings should be changed to account for the 10% increase in displacement? I`m aware of the cylinder volume parameter, are there any others? Anything in the idle section I should do in advance?

I had mapped the car prior to failure (not related!!) and so have a known baseline.

I will be starting with std MAF sensor still and the standard throttle body.

Thanks all.

There a many. Use math. Your displacement changed by a certain percent. Use that percent change on all of the tables that are air FLOW based. Example base idle air. Used this to fix a tune for a stroked LS9. Works perfectly.

[Sub8]

Thats useful, thanks guys.