BOOST Problems FIXED
08-10-02, 01:31 PM
#1
Full Member
Thread Starter
Join Date: Dec 2001
Location: Bay Area, CA
Posts: 99
Likes: 0
Received 0 Likes
on
0 Posts
BOOST Problems FIXED
Here was the problem I was having
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 decided to perform the PCV removal on robinette's site (http://www.rx7turboturbo.com/robrobinette/pcv.htm) hoping to eliminate my boost problem. As I removed the vaccuum tank I noticed the nipple was busted of the check valve in the same location. I continued to eliminate the PCV and then replaced the check valve. MY BOOST PROBLEMS ARE FIXED! Hopefully this helps other people having similar issues
BigRed
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 decided to perform the PCV removal on robinette's site (http://www.rx7turboturbo.com/robrobinette/pcv.htm) hoping to eliminate my boost problem. As I removed the vaccuum tank I noticed the nipple was busted of the check valve in the same location. I continued to eliminate the PCV and then replaced the check valve. MY BOOST PROBLEMS ARE FIXED! Hopefully this helps other people having similar issues
BigRed
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
25
07-01-23 04:40 PM
rkhanso
2nd Generation Specific (1986-1992)
1
08-13-15 11:40 AM