New mbc
#21
Elite Member
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Join Date: May 2007
Location: Cromwell, Connecticut
Posts: 2,604
Total Cats: 16
I actually MIGHT be having issues with mine. I am randomly only reaching my wastegate pressure here and there. Might be a boost leak or something, but I plan on checking my MBC too.
Other than that the NXS has been great so far.
Other than that the NXS has been great so far.
#22
Cpt. Slow
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,184
Total Cats: 1,135
Yeah you can't escape the sexual references. You could try messing with your t, I just gave up and paid $12 for a eBay ball and spring version. Which is linked in te thread I linked on page one of this thread.
#26
Ok, I went ahead and ran my vac/boost line off the tb intake pipe after the ic.
Initial impression- didn't do a damn thing to the boost creep/taper off issue, but did seem to smooth out my drivability mid throttle, on/off boost.
I think the real problem lies within the ball/spring tee like curly and pen mentioned. As you can see in the log, I surge to about 11psi and taper off to about 8psi within a sec or two. This is with one click on the controller.
I am going to try cutting the spring in half and see if that helps any. If not this thing is going in the garbage. I will update later tonight.
BTW, 11psi feels damn good! I added some fuel and pulled a degree of timing and I managed to see 12.0 afr@ at 85% dc with greentops and no knock during the 11psi surge.
Initial impression- didn't do a damn thing to the boost creep/taper off issue, but did seem to smooth out my drivability mid throttle, on/off boost.
I think the real problem lies within the ball/spring tee like curly and pen mentioned. As you can see in the log, I surge to about 11psi and taper off to about 8psi within a sec or two. This is with one click on the controller.
I am going to try cutting the spring in half and see if that helps any. If not this thing is going in the garbage. I will update later tonight.
BTW, 11psi feels damn good! I added some fuel and pulled a degree of timing and I managed to see 12.0 afr@ at 85% dc with greentops and no knock during the 11psi surge.
#27
Woah, cutting the spring in half made all the difference! Now with 5 clicks out on the controller it hits 10 psi and stays there. It may drop off a half lb after 6k but i'm just fine with that for now. My car is a beast! lol
I didn't do another log yet but I may go out again once the laptop charges up some.
I did notice there is a bit more lag then there used to be, not sure if its due to the distance away from the WGA or just due to the fact that i'm still rocking the stock muffler? I'll be ordering a nice free flowing one now that this issue is solved.
Happy and addicted to boost once again! Thanks curly and pen!
I didn't do another log yet but I may go out again once the laptop charges up some.
I did notice there is a bit more lag then there used to be, not sure if its due to the distance away from the WGA or just due to the fact that i'm still rocking the stock muffler? I'll be ordering a nice free flowing one now that this issue is solved.
Happy and addicted to boost once again! Thanks curly and pen!
#29
Cpt. Slow
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,184
Total Cats: 1,135
In general those types of MBC have a slightly more delayed boost response. Either because of the long source line to the cabin or because of the bleeder valve design. Remember no air is lost in the standard ball and spring design.
Good job though, sounds like yours is working even better than mine.
Good job though, sounds like yours is working even better than mine.
#30
In general those types of MBC have a slightly more delayed boost response. Either because of the long source line to the cabin or because of the bleeder valve design. Remember no air is lost in the standard ball and spring design.
Good job though, sounds like yours is working even better than mine.
Good job though, sounds like yours is working even better than mine.
#31
Well, I finally got around to buying a true ball and spring mbc. Picked up the nxs one off ebay.
I still have a slight issue with spiking but it definitely spools up quicker and hits harder that the other one.
The instructions that came with it recommended that for the least spiking, run it directly between the turbo and the wg. I was tapping into the tb inlet pipe previously and once I switched it back, it did cure a lot of the spiking.
I like it! Though it was harder to adjust than the other one. Very touchy, 1/4 turn is like 1-2 psi!
I still have a slight issue with spiking but it definitely spools up quicker and hits harder that the other one.
The instructions that came with it recommended that for the least spiking, run it directly between the turbo and the wg. I was tapping into the tb inlet pipe previously and once I switched it back, it did cure a lot of the spiking.
I like it! Though it was harder to adjust than the other one. Very touchy, 1/4 turn is like 1-2 psi!
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