[Squidward]

Originally Posted by JLMounce

If you're gaining mph, you're going in the right direction. ET's can very a lot based on traction, but if you're in it through the entire run, the MPH should be pretty consistent. So changes there can tell you if you're going in the right direction.

In regards to power falling off, did it do so before with the carb as well? If so, there's always a possibility that's not tune or fueling related. It could be something like valve float occurring.

I'm assuming this is on your car that has the 350/#62 combo? That cam should be pretty healthy in that setup.

350 with #12's. I thought the combo was going to be healthier, but it hasn't been quite so. Springs are Crower 68404's.

Power also nosed over similarly with the carb. Seems great up to the 1-2 shift, could probably go to 5500. It then noses over up around 5k for the 2-3 shift. Maybe it doesn't have enough torque to keep winding it up with the torque load in 2nd.

What I am understanding is that the 20.6 afr on decel (limit of what it can detect, obviously leaner) is ok.

I will try the dTPS. Makes sense. That I can tune/test on the street nearby. Thanks!

[JLMounce]

Originally Posted by Squidward

350 with #12's. I thought the combo was going to be healthier, but it hasn't been quite so. Springs are Crower 68404's.

Power also nosed over similarly with the carb. Seems great up to the 1-2 shift, could probably go to 5500. It then noses over up around 5k for the 2-3 shift. Maybe it doesn't have enough torque to keep winding it up with the torque load in 2nd.

What I am understanding is that the 20.6 afr on decel (limit of what it can detect, obviously leaner) is ok.

I will try the dTPS. Makes sense. That I can tune/test on the street nearby. Thanks!

Yeah, if that symptom crossed from carb to FiTech, I'd look at non-tune/fuel related. I suppose it's also certainly possible that the engine is done by that rpm as well. Though I would think that cam would carry power a bit further.

And yes, the 20.6 afr reading on decel/coast is fine. There's literally zero fuel being put into the engine. The FiTech just doesn't have a way to show you "no fuel" so it gives you some stratosphericly high AFR reading instead.

[er455]

I am glad JL mounce responded he is been playing with the fitech a lot longer and is much better at tuning than myself. I have been sort of lucky that my is running well but mine is on E85 and boosted ...I am sorry that i can’t help more as I have not made any trips to the track... I will share any info I find that might be helpfull ..

[JLMounce]

The biggest thing to remember with EFI tuning is that you're just replicating in a digital format what you do with a tuneup on a carbureted vehicle. Once you can wrap your head around that, the barrier to entry falls quite a bit. Then the additional features like being able to have non-linear spark curves and things like DFCO don't become as daunting.