Ok, everyone knows of the boost probs I have been having, actually a boost leak. Well there was also a weird popping noise that went along with it. Today I ran the car with the vac line off the compressor, basically open wastegate. Now today I had no problem hitting 10 psi and was still rising in 4th gear at around 3.4-4k rpm and no popping noise with it. So I assume this means that I have isolated my boost leak down to the wastegate and/or boost controller. BTW tial wg with turboxs mbc. How do I narrow down the prob even more. I can not drive around everyday with the open wastegate.
So with bc and wg 3-4 psi with 10 turns of the bc.
10 psi without the wg or bc.
SO please help a brother out.

 

do you know what spring you have in the wastegate? if you take the boost controller out of the mix does it hit the amount of boost that the wastegate is supposed to open at. maybe that would help to narrow it down.

 

Opps forgot to explain the details, this is a drag gen 2 kit on a lsvtec teg, tial wastegate with xs boost controller. I have struggled 2 months with this, the bc isd connected to the compressor and the wg is connected to the bc(bottom port). I am pretty sure I have not boost leak, as I had to make new couplers and buy some heavy duty clamps to hold the piping together. And could only hit 4 psi, 5 on one occasin with the the boost controller, 3 psi max with the wastegate itself. Now with the wg and bc dissconnected I hit 10 very easily. And with it disconnected I hear no popping sound, sort of like metal on metal, very strange and need some help with this. Before I sale the darn thing, j/k about selling but seriously runnind out of patience and time. Thanks for your suppost.

 

The wastegate has the yellow spring, I think that is 6-7 psi right. It came with the drag groupbuy.

 

I am not sure how the turboxs BC works, but you may need to bleed a little boost between the BC and wastegate. If the XS BC works as a normal ball/spring MBC would, the pressure between the BC and WG is trapped until it leaks out through the WG seals (very slow). I had to drill a tiny hole in the hose-NPT brass fitting coming out of the MBC (do not drill the MBC!). Since you are tapping the MBC at the comp housing, your manifold pressures would be a bit lower than the WG spring which is probably the .45bar.


[Modified by G, 1:19 AM 2/17/2002]

 

wait a second. G...do you have an internal wg? before you confuse anyone, im almost positive this is only for internal wgs.

 

Also forgot to mention that I am pretty sure the wg opens up, because of a melted ac line.

 

I've got a Tial and I think the fellow above has one too. I did read that the internal WGs leak more, so the relief hole isn't necessary for a ball/spring MBC. As for my little homebrewed MBC, after the relief hole I can adjust pretty much to any psi I dare.... I also tested the Tial, and when I pressurized it with a check valve to try and keep the pressure in the WG, it closed (leaked pressure), but very slowly....

 

i thought green is 6 psi. thats the color i have w/ my tial and right now i'm running just off the wg and boosting about .46 kg/cm2. somethings up with my bc too so for now its unhooked.

 

knda off topic but can u use a MBC with an internal w/g? how does that work?

 

I am not sure if it is the boost controller or the wastegate. http://www.turboxs.com

 

Ok, tried the vac source for the wg and bc at the fpr vac line, the vac dropped to 10, but was 20 at the compressor.


[Modified by hybridrex, 10:17 AM 2/17/2002]

 

Hmm...wastegate diaphram is fubared, thanks Silverls2000. Time to get another one.