Can someone please give me the Readers' Digest version of boost control? I know I'm supposed to port the stock wastegate before I run a free exhaust so I don't get "boost creep." If I get a boost controller, do I still need to do this, or does the boost controller take care of it?



And where does the BOV fit in? https://www.nopistons.com/forums/pub...R#>/unsure.png

Okay, so I found some info at rx7.com. A pop-off valve will protect the engine from too much boost under open throttle, while a blow-off valve works to relieve boost spikes when you come off the throttle to shift. So I really need both.



Is the stock blow-off valve adequate?

I wouldn't count on it...

ur still gonna want to port the wastegate, the boost controler can only control when the wastegate opens not how well its gonna work.

no you don't want a pop off vavle. yes the stock BOV is fine till 10-12psi.



either port your wastegate, or don't put a full exhuast / intake on.

Save your $ the stock BOV is fine.

Okay. So I've got the stock exhaust off all the way to the turbo. I've yanked the ABS pump to make some room, and I'm putting in a rebuilt master cylinder and the brake lines from a non-ABS car after this job is done. No more leaky ABS pump for me! I'll be happy if the brakes work after I put it all back together.



Next step is to pull the turbo for the purpose of porting the wastegate. It would be nice if I could see more of it. The air box is next on my list of things to get out of the way, followed by the heat shield thingie they've got the turbo covered up with. With any luck, I'll have the car back on the road in a month.



Is there anything else I should consider while I've got this thing all apart?



Oh, and one more thing: Why is my HKS downpipe a couple inches longer than the stock precat and midpipe? I'm thinking something is gonna have to get cut. :(



Of course, if I never put a cat-back on it, I guess it'll be fine. I wonder how loud it will be.....? :o

the hks dp shouldn't be any longer....

I swear I've laid them out side by side, and the HKS is like two inches longer. I'll take a pic when I get home tonight. The curve and the holes in the flange and the general shape is right, it's just longer!

WTF?

maybe your stock exhaust is not so stock ?

I gotta believe it's stock. It's good heavy ****, and it's well rusted, but still serviceable. I'll post the pic in a couple hours.

Here's the pic. I put it up and it fits the turbo fine, but the end sticks past the mount where it ties to the tranny. I'd say it's two inches too long.



Sorry for the big pic. I forgot to shrink it.

that is the same thing as my old one. it should bolt up if not. make a midpipe https://www.nopistons.com/forums/pub...#>/biggrin.png

Okay, one more little problem with this dp. With the O2 sensor screwed into the bung, this pipe won't quite bolt up. The flippin' sensor hits the vacuum actuator for what appears to be the EGR? I'm not sure its the EGR, but its right there above the turbo exhaust outlet. I wasn't going to do away with the EGR at this point. Is it easily removed? Is there an O2 sensor out there that isn't quite as tall as the Bosch?



I looked at the stock precat, and it has the threaded hole for the sensor set at a slight angle to avoid the conflict. I thought this thing was supposed to bolt up? https://www.nopistons.com/forums/pub...IR#>/dunno.gif



Any suggestions?

it bolted up on my 87 TII..... your car is weird what can i say

Must be! There seems to be a small heat shield around this vacuum motor. It might clear if I yank that off.