DLM Stage 1 vs. Sean Roe

J DAWG

Enthusiast
Joined
Apr 9, 2002
Posts
2,238
Reaction score
0
Location
MS
You must be registered for see images


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

Joseph Dell

Enthusiast
Joined
Oct 2, 2000
Posts
3,463
Reaction score
0
Location
Atlanta, GA 30338
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

Enthusiast
Joined
Mar 18, 2002
Posts
507
Reaction score
0
Location
Albany NY
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

Enthusiast
Joined
Nov 7, 2000
Posts
603
Reaction score
0
Location
Temecula, CA
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.
 
Top