When I just had a 3" downpipe, I had a perfect boost pattern of 10-8-10. When I installed the RB catback, I began getting a boost spike to 12psi or so at transition. Now with a Bonez high-flow cat, spikes are 13-14 psi. No boost creep though.

I'm planning on getting a PFC soon. I already have a Datalogit, but am waiting for my user group join request to be processed. Can the sequential transition boost spike be tamed or eliminated soley with PFC/Datalogit settings?

thanks in advance,
Ken

P.S. How long to Datalogit "join" requests take?

 

I have not seen this issue with the PFC on several cars running sequential, so I think it's safe to say you will likely not see this boost spike with the addition of a PFC. Others may wish to chime in if they have seen issues ...

 

First off, if you're spiking THAT much on a stock ECU, you're lucky you still have a motor!

The big problem is the stock ECU's boost control just doesn't work properly when you open up exhaust/intake. It's preprogrammed around stock parameters, and when you change them things go nuts. That's why a boost controller is a VERY good early mod.

The PowerFC does have control over the stock boost control system, and it works well enough to keep things ironed out. On my car, after I installed the high-flow cat (I've got intake, downpipe, highflow cat, and cat-back) I had to drill the primary turbo's restrictor pill out just a hair to keep primary turbo spiking at part throttle in check. That's keeping things reasonable until I get a good boost controller.

Dale