Which MBC are you using?

 

Ebay special, I've been very happy with it. Recently moved it's location and Scott is informing me that the leak hole on the hose barb is on the wrong barb. It's between the signal source (cold side intercooler pipe) and the MBC, instead of between the MBC and wastegate.

Edit: and to clarify "not working", I meant I'm not able to turn up the boost past what is possibly my wastegate pressure, of 8psi.

 

Video time!

idle with a little free revving.



Near WOT to 6k. Watch the whole video to see how whinny my transmission is, fast forward to 1:05 to hear 1st and 2nd gear pulls.



All in all, extremely happy. I think I'm gonna wish I went with a louder muffler for track days, but this one is great. I can't believe that getting rid of a cat and going 3" kept it roughly at the same sound levels, but that's probably because it's not rattling all over the chassis and has no exhaust leaks.

 

Well, you have V-band awesomeness, so just have Abe fab you another 'straight' pipe to replace the muffler Looks and sounds great!

 

That exhaust looks sweet through the bumper cutout. Sounds great too.

Straight pipe for track days would be neat too.

 

Straight pipe would have to be ungodly loud, no? I mean without the cat the muffler is doing ALL the muffling post turbo, ya know?

I've gotta try twisting the v-band to see if I can get the tip a little further from the bumper plastic, maybe I'll take it off completely and see just how loud it is. I drove with an open downpipe to the exhaust shop originally, and it was unbearable. That's reverberating directly under me though.

 

Do not do a straight pipe. Buffon01 had a 3" straight pipe and the last time I rode in that car I was nearly deaf. However, it sounds like a jet and a gorilla spooning, so that part is always cool.

 

Weird, it makes no sense why it wouldnt work. Usually if you flip it it would run all of it, not standard wastegate pressure.. gotta check if your ball bearing is still there.

Ebay special is the T valve one right? There shouldnt be a hole on the barb of that one. It should be on the actual T valve.

 

Yeah I'm probably not going to do that. I love it the way it is. A little quiet for the street, and loud enough for me at WOT.

I gotta take the top off for a ride and really enjoy it. Soon...

 

Couldn't get a great picture of it, either dark or blurry, but this is the one I have, can't find it anymore on ebay.




Ball and spring are most definitely still there, I just took the barbs off to switch them the other day. Braineack said to put the hole (which you can see in the pic) between the MBC and wastegate so it can bleed off after the MBC closes.

I've gotten it up to 10 now, but it's really cranked down. I'll have to investigate further.

P.S. I'm moving this discussion to my build thread.

 

Okay well the next possible issue is the ball is not sealing good against the barb. And possibly a fatigued spring.

 

You know that's the one thing I didn't consider. I put that 90* fitting in there to ease routing, I'll take that out and see if it works again. Thanks for the idea!

 

I'd like to chime in with my noobishness, I had the opportunity to drive curly's car before and after the exhaust was installed, and holy cow did a make a difference. I was amazed how much it opened the car up above 4500 rpm. He needs to dyno it again though.

 

Yes indeed. Real dyno coming soon I hope.

In other news, an RX-7 diff is being rebuilt in my garage, and some RX-7 stub axels are on their way. Just in time to test my drifting skills in the rain!

 

Josh, tell them about all the success you had with the RX diff and how you now have a different miata in your garage...

 

 

Martin, dude, got a rep to keep up here.

It's true though, although I'm only borrowing his craptastic miata to slap it together for a track day.



Feel free to criticize his hood cuts, I think only one of them is effective.

 

Since you asked for it, sup with them hood cuts? Only one of them is effective ya know.

 

I know I know, he's a little over exuberant with the angle grinder.

It weighs 1980lbs without a driver and a full tank of gas. On bilsteins. With one of the more potent 1.6s I've driven, a VLSD, and smooth 5spd. It's a hoot.

Multifunction:

 

that last picture is badass... so much win