Those are great numbers and a few other mods will open that baby up nicely

 

What am I going to do about this? Should I get bigger injectors. What happens to my power if the AFR goes to 12-13? Thanks

 

I would highly recommend you upgrade the injectors as soon as you can. You especially need them before you spray. If the A/F gets between 12-13 your power will increase, and probably a good bit depending on timing/knock retard.

 

Just from what I can see;
For increased NA power:
1- Bigger injectors 42lbs recomended
2- Port TB
3 Tune correctly
For juice:
4- Tune right AFR, use window box for nitrous
5- TR6 or 1 step colder plugs for N2O (reduce gap to .035>.040 range)
6- Wideband O2 kit for AFR monitoring

 

I am headed to speed inc monday ....same mods same cam heads ..... i will post my graph....

 

Power will decrease as the AFR comes down. At or slightly below 13/1 is optimal.

 

Not quite tru, it all depends on your SCR/DCR, plugs used, type of head chamber, size of valves, cam lobes used, cam events etccc....

My 370 is optimized at 12.6 peak rpm and 13.2 peak trq no knock.
AFR should never be linear in a combo at WOT if tuned correctly.

 

what do u mean by liener

 

lin·e·ar \ˈli-nē-ər\ adjective circa 1656 (1): of, relating to, resembling, or having a graph that is a line and especially a straight line : straight

 

Ok, I gotta bite on this because despite your jacked up LEAN A/F your dyno sheeet shows some serious power. Who did you get the cam and heads from and what was your budget on the project (ballpark is cool)?

You NEED NEED NEED to fix that A/F before you spray that motor or else you're going to be searching for piston parts in your oil pan...

 

I called the tuner today and he said the sensor was at the tail pipe and the cats were causing the reading to show high and the actual F/A was 13.1 to 13.5. I will get the injectors and ported throttle body and take it back in about two weeks and do a dyno on motor and n2o for you guys. If I didnt mention before it is a NX wet kit. I hope this will help out from 3 to 4K but on motor after 4k it is scarry. Thanks a lot for all the replies.

 

I got the head and cam from TSP. They seemed to have a great rep and I couldnt wait 6months for the parts. I ordered it and it was here in two days with all the parts. Ill give you a run down of price if you have any qs fell free to Pm.
H/C, pushrods, gaskets, 1900 Optional LS2 timing chain, LS6 pump, ARP bolts,
Racetronic FP w/hw kit 650

Wideband tune 350

Labor was me but RPM in St Louis charges $1100 for H/C swap.
They charged $350 for fuel pump and hot wire install.
$500 for gears,TA cover and clutch including turning the flywheel.
$100 for dyno runs.

 

From tuner "I guess you talked to tim about the A/F ratio. It will always show leaner at the tailpipe rather than what it really is, you have cats, and you tune is not just a dyno tune. The A/F ratio will show leaner on a dyno roller and richer on the street because the roller doesnt weigh as much as your car does, so it will run leaner on the rollers."

 

True but not by that much, ask him to "read" the plugs.