KevinK2

There are levels of 'knowing' the control system, and what can be done with the stock ecu. Those that have had an FD for many years, and followed the development of various mods on the old list, know that an intake and cat back do not tax the limits of proper sequential boost control, with no significant spikes.

The early spike in single mode is a less common issue than transition spike. You did a lot of right things to correct it, but a malfuntion remained. With those 2 mods, and hi-flo cat, dp, and IC, just pills kept my boost under control with stock ecu, as it usually does with a healthy system. It worked for me with tired engine and turbos, as well as rebuilt eng with new turbos, using same healthy control system.

Regarding non-seq'l with less lag than 'stock', I assumed you meant stock set-up with sequential. I did not find that statement repeated at the link. One writer did imply that with proper mods lag was not a problem (for him). For many, response below 3200 is important, and sequentials have much less lag down there.

Lots of great reasons to go non-seq'l, but just adding intake and cat back isn't one of them.

Rayman93RX7

iTrader: (4)

The Pills act just like the manual boost controlers. I have manual boost controlers and no matter what setting they were on the spike would stay the same or get worse. Maybe my car is different from everyone elses and no one else gets boost spikes but me. Oh wait but only two people have said they were able to stop the boost spikes on a seq. without an upgraded ECU only a simple waste-gate ajustment. Oh I must be so stupid that I simply ignored all of the simple advise off people telling me how to fix my boost spike. Sure I wanted to spend time taking off the TCA, capping hoses, and taking off crapy hard rubber hoses in hard to reach places. Do you people understand I've tried every single other method out there to stop the spikes and had little to no sucess untill I did the non-seq. convertion. Thats all that worked on my FD. So my be someone else has the same problem as me, I'm just trying to save them agrivation. Hey maybe the pills worked for you, maybe the manual boost controlers work for some one else but I think for most people thats not gona do any good.

Also how can putting more pressure on the wastegate to stay closed (ie putting a restrictive pill in the line thus raising the amount of pressure need to activate the wastegate) stop boost spikes that makes no sence to me. Now I can see how maybe more prespool would divert the extra boost to the secondary by ajusting the pre spool rod. But I just didn't feel like dealing with it anymore so I never tested that.

Rayman93RX7

iTrader: (4)

I think my problem is that I assumed that everyone's car is the same and that they would all have the same porblems as me. I put up a post a while back when I was having boost spikes asking for help. All people would tell me is to put in a boost controler. So before I bought the $300 electronic boost cont I tryed a manual one following peoples advise. This did nothing and when I posted that no one had an answer for me as to why. So I researched it myself assuming I had a normal working seq. system since the turbos are new (installed through Mazda by the last owner) and have 4,000mi. on them. Looking around at some sites many people also said "try the manual boost controler" but that just didn't work for me. The only other options were get an EMS $1500, or go non-seq. $0. So obiously I went non-seq.(not full convertion) It stoped my boost spikes but gave me some lag(not too bad). So I thought I'd help some people out and post the steps I went through to get to this point.

I just think it's funny how the people who really know alot about the seq. turbo and have alot of experience (experience I don't have) working with the system and could have really helped me before are only now telling me that there was someing else causeing the spikes just so they can prove me wrong. So you guys pass by a thread of someone looking for help, but you'll never pass up a chance to correct someone who might be wrong. This sucks

KevinK2

you simply didn't fix your sequential boost control problem, regardless of what u did. with non-seq'l conversion, the offending part was eliminated/bypassed.

pills and needle valves are functionally the same thing.

never said just use smaller pill. iirc, my primary spike happened with exh upgrades, and was solved with slightly large pre-pill, and larger main pill.

note that pettit has sold intake and catback package for centuries, and rotary peformance has always sold pills to go with different mod combos, with stock ecu.

Rayman93RX7

iTrader: (4)

Kevin K2----
when I inspected the W/G lines they had no pills. They must have forgot to put them in during the new turbo install. Stock my boost was 7-2-4 must have been cuz of the lack of pills. I so I put in manual Boost controlers. Then I could run 10 psi (inconsistantly) but I had a nasty 14-16psi spike. At this time I had a cb, and intake

what do you think the problem was? must be either the TCA or the Pre-spool actuator, the main W/G works fine now with the non-seq setup.

KevinK2

new replacement turbos usually have pills built into the nipples where the 2 hoses go, no pill in hose. if so, then my rec'n would have been get stock set-up to work right, no aftermarket controller.

very difficult to troubleshoot once usual checks are done. derek site for troubleshooting is very good. can't guess what your issue was.

good news is with non-seq, your 9 year old fd should be more reliable, easier on the turbos (even heat), and less expensive to keep running.

I can trick my set-up into non-seq at high rpm, then decel to about 3400 rpm and then punch it .... response there in twin mode was much better than I had thought.

search the links for mods to minimize lag, 'cew' did a lot of stuff in this area.

the simple pressure relief dawes device should work well ( dawesdevices.com ) for non-seq, put where pill would be in wg hose, and cap off 2nd nipple on actuator.

sorry, just occasionally check the forum.

Rayman93RX7

iTrader: (4)

I'm using an air pressure regulator for boost control I assume it works almost the same as the dawes. Extra pressure is veted to the air and a stedy flow comes out the other side. Works well the non-seq. didn't do much fo the seq. I'm keeping my car non-seq till I get an EMS cuz then I can really narrow it down as to what is wrong. If when I get my mp,dp I find that the lag is as low as others claim then I'll do the full convertion or get a single turbo. If i get the same or better perfomance, why bother with the mess of the seq. ?