DLM Stage 1 vs. Sean Roe

[J DAWG]

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Speaking of that graph. Why does it initially spike lean. Is that the pcm recognizing the boost and then accomidating for it.

 

[Joseph Dell]

Great question. I don't know the answer to that. What I _do_ know is that _every_ centrifugal dyno graph I've ever seen has the spike at the beginning...

This even happened with my ATI D-1 on a mustang... And that had a FMU and not a tuned computer.

Perhaps one of the tuners can shed some light on this one. Inquiring minds want to analyze graphs!

JD

 

[GONABITE]

I believe that initial spike is normal for the stock PCM even if you look at a stock dyno pull you will see the same thing. I have not dynoed my car with a wide band o2 since I intalled the VEC 2 but I beleive Sean has gotten rid of that inital spike with his progamming capabilties.

 

[WESTCOAST JASON]

My dyno charts showed the same initially also. I think you are right about it being normal for a stock PCM, but I was eventually able to flatten it with my setup also.