JWS6

glad to hear! let us know whats happening once you change the spring

windsma

thanks for being the guinea pig, please let us know what the secret combination is.

Sean94Z

Ok, so I tried the next spring up and it stayed closed pretty much until I was in boost and backed off, causing a high boost spike, then it opened. So, I went to the hardware store and bought a similar spring to the one I had and started cutting coils off of it. Now, I have it set to it stays open at idle, and closes between 5 and 7 inches of mercury on my vacuum gauge. It stayed closed all the way to around 5000 RPMs where I was seeing 16#'s of boost on my gauge. My car is not tuned at all for the new setup, so I am not going to rev it to 6500+ just to see if the valve stays closed. I can tell you it seems to work perfect with this spring and I notice I get into boost faster now. I am pretty sure the POS bypass valve from ATI was leaking before. Now I can hear the valve closing and the car sounds completely different.

So, now for some tuning and we'll see what happens on the dyno when I rev it up and get some high boost runs in.

JWS6

Sweet! Keep us posted

Violat0rX

any updates?

95 Silver TA

Sean,

Hows it going man?

How has this setup been working for ya?

Hope all is going well!
Claude

Sean94Z

Hey Claude,

Long time no talk.

After I did the BOV, I took the car off the road for the winter. I ended up replacing the seals in the D1 while I had it down, and a few other tweaks, like methanol

I took the car out for the first time last night, just did some tuning runs. Still seeing 15+#'s of boost at 5000 RPMs, I maxed out my map sensor, I only have a 2 bar MAP sensor hooked up to the DFI. My brother-in-law has a 3 bar so I am going to borrow his and see what it looks like. The car is so rich right now, I haven't turned on the meth yet, and I am seeing 9.5:1 - 10.5:1 across the board, that's with 22 degrees of timing and no intercooler.

Seems like the BOV is working fine, so, I will try to get some more tuning in, then tune for the METH and go from there..

Sean94Z

Took the car out again last night. This time with a 3-bar MAP sensor. I also swapped out the plugs because I was having a miss problem. Went with NGK R5671A-9 this time, I had the R5671A-8's before. All I can say is WHAT A DIFFERENCE! The car pulled strong through the entire RPM range, was 11.7:1 AFR all the way through the RPM range, so I still have some room to move. The 8's I had in there must have been a little too hot, because these new plugs have cleaned up the car so nicely. It runs so much smoother and cleaner the entire time.

Now for the fun news..

The MAP Sensor showed 15#'s of boost at 4500, 18#'s of boost at 5200 RPMs, and then I shut it down to check the AFR levels and make some adjustments. DId another pull, saw the same thing, and blew the intake hose off the throttle body. I had 0 tools with me, so I drove it home. I am sure I am going to see 20+#'s out of this D1.

This BOV has been working great for me. I am going to get some DYNO time this week hopefully so we can double check the tuning and make sure the BOV is staying shut. It must be though, when it opens, it dumps so much air, I doubt I would see boost levels like I am seeing.