Do I actually need a tune (or a VEC1)?: 96 GTS heads/cam 511 whp (but then there's 675 nitrous)

[Tom and Vipers]

Thinking I should have changed the title to: Is there any reason to not remove a VEC1?

According to Roe website info for Calibrator in 2001: OE tune at high load is excessively rich (11.0:1) with little timing (18*), low and midload, lean and lots of timing (45*)

Cam: 224* @ .050, .550" @ valve, 114* LSA

 

[Old School]

According to Roe website info for Calibrator in 2001: OE tune at high load is excessively rich (11.0:1) with little timing (18*),

An interesting result of doing anything that results in more air flow (heads, cam, exhaust, etc) at wide open throttle is it will go leaner because the same fuel is being injected in spite of the additional air flow. It's running in open loop mode and just using a predefined fuel map. This will get you closer to the desired 12.5-13 AFR without any tuning. Won't help with the timing though.

If it were mine, I would tune it.

 

[Tom and Vipers]

RE: Open Loop WOT:

Please note my thought experiment here could be completely wrong:

Cam and heads will make engine breath, VE goes up: With the positive displacement engine now pumping more air, MAP will go down (more manifold vacuum) because of the restriction of the intake system. More vacuum => lower load => less fuel.

Engine also has 70mm throttle bodies which reduce the intake restriction, MAP will go up => ... => more fuel

I have no idea what the net change would be.