No, I haven't, but 24-25psi is perfect for me, since I have never run more than 23. I don't plan on doing any serious boost above 25, so the JDM MR DV is just what I needed. It's quiet, causes no driveability/idling issues, and holds my daily boost perfectly as well as my racing boost (22-23). When I go for 11s in a few weeks, I will probably crank it up pretty high on leaded race gas just to see if it helps get 90mph 1/8ths.

 

Very simple fix. MBC's have a bleeder hole that if you largen up will hold constant boost. Usually MBC's will spike to a preset boost level and then taper down. Widening the bleeder hole will allow you to hold a certain amount of boost throughout the RPM range. HTH.

 

Well my guess is that my gauge is now faulty? i do have boost taper a bit as rpm go up.. it reads 22 peak and drops at 21.. and holds strong at 21. FROM WHAT MY GAUGE READS! I do have a custom flash on 93 pump octane gas. From what your saying is that my car is a miracle from god apparently. I live in Wisconsin and dont run under super high humidity or dew points. Maybe your in Florida or something

 

No, just saying that the stock turbo naturally tapers above 6500 rpm. By 7500rpm, it usually drops 2-3psi on my current setting of 21.5psi (spike) or so. Buschur himself said the same thing...that the stock turbo would always drop down to 20-21psi or so even when they opened it up all the way (28psi). The stock turbo just is not capable of sustaining such high boost for that long. If you are holding 21psi all the way to 7600 rpm, then be happy. Mine isn't capable of it, yet you see what I'm capable of in my sig. I would guess you could do even better if this is truly what is happening. I'd love for my boost to hold at 21-22psi all the way to 7600 in 4th gear when I'm right near the end of the 1/4-mile. It holds 22psi from 5500-6500, but then it starts to taper slowly and ends up around 19psi, but definitely below 20...

 

well first things first.. i have a 03 with a 9.5 hotside compared to your 10.5 MR so your times will be a tad faster regardless of mods until i change mine out. My Auto meter gauge truely shows me maintaining 20+ up to 7600. I should get someone to video it so i can more closely watch and show you. Dont ask me why mine appears to hold, but it surely is with the stock bov.

 

Oh, Autometer. Now, it all makes sense...

 

Well not ALL Autometer products are bad ....just like with any type of product. Boost leaks can occur in more places than just the BOV. My car had a horrible leak -- turned out it was one of the vacum caps I had used was rotting allowing air to flow out during the intake.

Since I have addressed this issue my car goes up to 22 lbs and will stay there up til redline tapering off to 21 lbs

 

How much more to drill out the hole to hold 21psi?

 

Hmm shoot I forget the EXACT size. Its the next drill bit up from the factory sized hole. I believe its 3/32" drill bit.

 

OMG its another MIRACLE CAR LIKE MINE!!! hahaaha.. holds 21 til redline.. nice

 

Depends on what he means by redline. To me, redline is the rev limiter (7600), while others means the point at which the tach becomes red (7000rpm). The stock turbo still naturally tapers above 6500-7000rpm, and it's more than 1psi. If you hold 21 til 7600rpm, then you most likely spike above 22psi at the onset of boost. It's all semantics really. I can get my boost to hold almost 22psi in 4th gear, but that means I spike to nearly 25, and I knock through the roof, which is useless...

 

do you answer when its knocking so much??

 

Yes, by turning down the boost to a level that makes efficient power with a solid timing advance and 11.3-11.5 AFRs across the board en route to an almost perfectly-flat torque curve while on 93oct in summer heat. When I open the door, the knocking stops, and I'm rewarded with wonderful timeslips.

 

i c.. well.. thats just great.. r u running cams?

 

No, just the mods in my sig.

S-AFC/K&N/Cat-back/MR DV/MBC - 12.6 on 93, 12.2 on 104/93 mix.