Alright. this situation has been touched on a few times recently, but I've been able to study it a little further. With this new info I'd like to get your information

Perf. Mods:

DP, CB, PowerFC

I was having an odd boost transtion. I would get boost pattern of 10-5-5>>creeping to 10 during a boost test. This was happening constantly with no deviation.

I swung by my mechanics place to have him take the car out for a spin and try to duplicate the problem. before we headed out, he adjusted the duty cycle (65% primary and 65% secondary) and we could not reproduce the odd transition.

later that night a friend of mine got his datalogit and we hooked it up to my PFC to test it out. Worked great. while we weren't recording, I was able to reproduce the same boost pattern, but not as freqently.

over the next week and a half I've been able to note the following:

1) exaust note change : when this transition problem occurs, there is a specific change in the exaust tone. The exaust gets louder, but less crisp.

2)4000 rpm flooring the gas: this transition problem most commonly occurs in 3rd or 4th when mashing the pedal after cruising.

3)I can correct the problem: If I feather the accelerator, or downshift and then accelerate I can usually get back to normal boost levels.

I'm hoping these descriptions are enough to have someone point me in the right direction.

Thanks

Bigred

 

did it bolw that hose off the vacuum tank again?

mike

 

nope.. that's not it mikey. I wish

 

I'm deeply tempted to go non-seq to fix my 10-5-7 pattern.

 

It happens alot less often now that my mech. changed the duty cycle. what/where does this control and is there a posibility of that getting stuck or breaking?