How are modded 240s tuned? I never see a dyno sheet in the for sale section.

[mx597turbo]

I'm coming from the LSx, world so maybe things are different. With most US vehicles, a tune is putting the car on the dyno and fine tuning the fuel settings until it runs clean and has a correct afr. You can get a mail order tune, but dyno tuning is only about $100 more, so almost every one prefers to do that.

Looking through the for sale section, I notice almost every car for sale has an engine swap, and is modded, but only very few cars actually have dyno sheet. How are these cars tuned? Just wideband afr?

Also, are the ecu's flashable, or do you need a standalone programmable? How do you change the rpm limiter?

Just wondering this, because I generally call bullshit on any claimed HP numbers without a dyno sheet. Actually, I usually pay for a dyno run for a car I'm looking to buy. This way, I see the numbers, and if the car is going to break, it does before I buy it. It's usually $50 well spent.

To anyone looking to buy any car, trust me, if they won't let their car be dyno'd, just walk away. There's no reason anyone should be scared of a 4th pull to redline.