Boost Spikes HELP
 

:confused: I have a 1993 FD, with F-Con, FCD, Gen.1 Apexi AVC-R (not plug in), A/F ratio gauage, boost gauage, RE Amemiya intake, PFS downpipe, midpipe, Tanabe G-power cat back. The first time I can really pay attention to the boost meter was on the dyno, the boost slowly raise to 10psi then to 12 and a sudden spike to 14 and then abit higher still then slowly drop to 12psi. I set my FCD to 7 is that enough? Also if I do plug in the AVC-R and set it up will this help decreasing the boost spike? I don't plan to have the car run higher than 13psi (0.9bar) on races and 10.9psi (0.75 bar) on normal driving. Or do I still should replace the stock restriction pill and if so how will that affect when the ACV-R is running, and what size of the pill should I use?
Thank you for your help. My dyno chart is avalible for download to provide solutions. Thank you again.https://www.rx7club.com/forum/attach...&postid=493951

The boost controller should help control the boost spike.

porting the wastegate will get rid of the boost spikes.

do a search... you will find a lot of threads about this topic.

1FAST7

This is false. A boost spike occurs when the physical limitations of the wastegate are overcome. Changing duty cycles or pills will not help. The only way to remedy this is to either port the wastegate, or add some restriction back into the exhaust.