Hey I have heard that some auto part stores sell different restrictor pills. Any idea if this is true, if so which ones, and do you think this would be a viable option over the DIY kit? Thanks

 

Offset should be able to go to at least 159, possibly higher.

With the right hose/restrictor/actuator/solenoid(s) changes in place then you should be able to target loads up to (159+159) which should be more than adequate on the stock turbo.

I used to use an adjustable restrictor valve which was in place of the restrictor on another car. Worked well - just set my boost targets and a non-maxxed duty cycle - eg 60% and then adjusted the restrictor until it boosted nicely in the midrange. Then adjusted the duty cycle to max at the bottom to assist spool, and then did whatever it needed at the top end - on some turbos increase the duty to 100% at about 5500 RPM like the stock Evo turbo seems to like, or on big ***** turbos that were going to bust the engine with too much boost at the top, then reduce it even.

 

I started with restrictors from the store. reason why I didnt like it..

- its not just a pill, its a platic vaccum connector with a restrictor in it, so you had to have a peice of vaccum hose on each side (with small zip ties holding them). You couldnt just shove it in like the DIY pill.

- The restrictor size was about .8mm (or about #65-66 on the drill size). At .80mm it made WG duty go really low, bout 40 and it had more tendancey to spike. When drilled with the #60 drill bit (1.02mm), it had too high of WG duty and no "headroom" for race gas. It would probably be just right if you drilled it with about a .90mm bit (#62 or 63), but all the bits higher then #60 are very hard to find and you usually have to buy a whole set for about 20$, instead of 2.40$ a piece for the #60 and lower bits.

 

is it possible the wastegate is opening, like a stronger wastegate actuator is needed

 

Is it possible to fill stock restrictor with jb weld or liquid metal and then drill hole size.

 

Boost on IX is limited by the stock pill (the one close the soleno). As long you have it, your boost ll stay about the same. Remove your stock pill and your should raise your boost higher.

 

First of all, the VIII & IX BOTH have the two pills in the system. Even with removing the pill near solenoid, raising desired target load doesnt raise the boost.
Taking the pill near the solenoid does make boost go up a couple pounds.

Also, right now I have my modified pill by the turbo and the stock pill by the solenoid and I have raised the boost to 25lbs and can raise it higher. So, you can make boost go higher witht eh stock pill near the solenoid still intact.

 

Yeah, but I wanted to keep the stock pill original, so, if needed, I could put it back to stock.

 

Curious, what are you tapering to near redline w/ 25lbs boost peak?

Do you do anything to compensate for gear to gear loading, hence different boost levels?

 

Solder works well too, and there's no waiting for it to dry.

 

How about moving the restrictor from before the solenoid to the pipe between the compressor outlet and the T-piece? Not seen USDM pipework to know if the sizes are the same.

 

OK sorry but I am having trouble finding the correct drill bits.

I found a 1/16 drill bit (too big), but nothing close to a 1.09mm to 1.02. Where did you find #57 - #60? Also, Lowes sells Brass rod 3/16 which may hold up better than aluminum. Thanks

 

try Small Parts........www.smallparts.com they have everything in drill sizes.

milburn

 

I dont agree with this, with the pill near the solenoid removed you should beable to raise the boost by altering the desired target load values; maybe when you tested this your boost limit values were to low. With the pill near the solenoid removed, I normally just zero out the error correction and just use the wastegate duty values to control boost; but if fill the error correction values back in and enter load values at each rpm point, in the desired target load table(s), that are higher then the load I would normally see, the boost increases. Just as if i put lower values in the desired target load the boost decreases.

 

I tried this. I could never get more than 20psi, but I could easily control the boost levels below that maximum with ease using the boost load tables.

You need the right combination of boost pills to control the basic wastegate operation.