MBC Not working

[Jordanbutter]

My 2g has a MBC it is hooked put to the lower i/c pipe and the waste gate, I have a Blitz turbo timer that works as a boost gauge in hkpa, i did the conversions and no matter how much i play with the mbc i'm only pushing .66 hkpa aprox 9.5 lbs is it a gauge problem or a mbc problem thanks.

 

[screwdgie]

http://www.dsmtuners.com/forums/attachment.php?attachmentid=46910&d=1108474460 I hope that helps.

 

[Highwayrun]

It seems like a boost controller problem to me.

I take it your boost gauge does indeed indicate varying readings? If it does, then it's most likely connected (and reading) properly.

Doesn't the car feel very slow at 8.7 psi, perhaps even slower than stock? With your mods, if your MBC were working right, your car would be much faster than stock. (Did you build up the car, or buy it already modified?)

What kind of MBC are you using?

 

[ericbev]

Getting a standard boost gauge wouldnt be a bad idea.

 

[Jordanbutter]

i got it like that so im not sure what brand the mbc is i was told it is a blitz but i don't believe they make mbcs and it feels fast i run a 14-14.5 sec 1/4 mile on the street so im not so sure

 

[Jordanbutter]

also as far as the mbc piping there is no t-fitting to the blow-off it goes straight to the lower i/c nipple does that matter?

 

[Drift_SM]

i got it like that so im not sure what brand the mbc is i was told it is a blitz but i don't believe they make mbcs and it feels fast i run a 14-14.5 sec 1/4 mile on the street so im not so sure

HUH!!!!!! WTF

14-14.5 with a 16G, and S-AFC II. thats .......ummm....not right.

my car did 14.2 with ONLY a cat-back.

sounds like you ahve a major boost leak...so no matter how high you turn up your MBC its only pushing 9.5 PSI.

either that or your MBC could be hooked up wrong.

try a boost leak test, search it in the forums. Or just go out to your car and look over every vacuum line, inter cooler pipe, ect.... tighten every thing, and after if that effects the PSI even a little bit then it proly is a boost leak. then you need to do the test.

 

[Highwayrun]

Jordan, could you upload a picture of the MBC, or maybe even upload a sketch of it? Are there any markings on it? Could you describe it?

 

[Jordanbutter]

the mbc is straight tubed to the waste gate nipple and a straight tube to the lower i/c nipple no t-nipple to the blow-off (which only has one nipple anyway)

 

[Highwayrun]

the mbc is straight tubed to the waste gate nipple and a straight tube to the lower i/c nipple no t-nipple to the blow-off (which only has one nipple anyway)

The connection points are good, but we really need to know about the MBC itself, since designs vary and any speculation on the exact cause of the problem at this stage may have adverse consequences.

What colour is the MBC? Does it look fancy, or is it made of cheap brass fittings? Give us a good description of the MBC.

 

[Jordanbutter]

i put a pic of the mbc in my gallery it should be in for all to see

 

[SethA]

As has been mentioned, check for boost leaks before doing anything else. This is most likely your problem.

While you are doing this you can also verify that the boost gage function on your turbo timer is working properly. Please report back with your results from the test.

Seth

 

[K_Hill]

These links might help you out

http://www.belitski.com/vfaqhallman.html

http://www.vfaq.com/mods/ICtester.html

http://www.plymouthlaser.com/joep.htm

 

[majik2k5]

It could just be me, but when my friends 2G had the boost controller hooked up to the lower I/C piping it didn't work right at all.

 

[oldman]

It could just be me, but when my friends 2G had the boost controller hooked up to the lower I/C piping it didn't work right at all.

It's just you, compressor housing/j-pipe/licp are the best pressure sources for your mbc.

Jordan, I looked in your profile and did not see a picture of the mbc, have the problem been resolved? If not, it's crucial that you get a real boost gauge ASAP, the boost gauge on the TT, like the stock boost gauge, does not measure real pressure if I'm not mistaken. If you still need help, post the picture again.

One more thing, please use puctuation and capitalization in your future posts, we are trying to keep the tech sections of the forum as professional and easy to search as possible. Thanks.

 

[dalatinromeo]

My 2g has a MBC it is hooked put to the lower i/c pipe and the waste gate, I have a Blitz turbo timer that works as a boost gauge in hkpa, i did the conversions and no matter how much i play with the mbc i'm only pushing .66 hkpa aprox 9.5 lbs is it a gauge problem or a mbc problem thanks.

If I am reading right the connections are correct. It could be a faulty mbc. Have you found your problem??

 

[Jordanbutter]

I have a feeling I'm leaking really bad. The picture should be in soon. If I build a boost leak tester where do I put it, how do i attach it? I saw a video for unpluging the clutch sensor is there a video for this?

 

[oldman]

Boost leak test.

 

[travislaw]

I have a feeling I'm leaking really bad. The picture should be in soon. If I build a boost leak tester where do I put it, how do i attach it? I saw a video for unpluging the clutch sensor is there a video for this?

Jordan, I live in the Springs and have the boost leak tester. Let me know if you want to come over and test it. I can help you for free. Consider yourself lucky, I installed my Evo III 16g and I can't get my boost below 20 pounds. I am in the process of doing leak tests myself. I found a big one on the weld job for the 1st gen BOV. Got that fixed. Haven't tested since then and still having the problem. Anyway sorry to ramble. Just let me know if you want some help. Send me a message.

 

[oldman]

Travis, you most likely have boost creep though finishing up that leak test wouldn't hurt.

 

[travislaw]

Travis, you most likely have boost creep though finishing up that leak test wouldn't hurt.

Oldman,
I thought so too, but I installed my Evo III o2 Housing and noticed I have the bigger Wastegate flapper. I also have a 2.5" catback exhaust. So I am not sure what else could cause the boost creep. I thought the bigger exhaust and o2 housing would take care of boost creep. Maybe I'm missing something else.

 

[oldman]

Oldman,
I thought so too, but I installed my Evo III o2 Housing and noticed I have the bigger Wastegate flapper. I also have a 2.5" catback exhaust. So I am not sure what else could cause the boost creep. I thought the bigger exhaust and o2 housing would take care of boost creep. Maybe I'm missing something else.

The main cause of boost creep is the turbine housing design (mainly the inlet), not your o2 housing flow capacity. And yes, you can still creep on 2.5" exhaust as I did.

http://www.dsmtuners.com/forums/showthread.php?t=186525

 

[dalatinromeo]

Did you find your problem yet??

 

[Jordanbutter]

Ok guys, I unscrewed my mbc all the way and hit 2.05hkpa or 30ish psi (scary s**t) but when I closed it up even a little bit it went back to .66hkps. So I don't know what that means but that's what you guys are for.

 

[oldman]

Where is the picture of the mbc? Draw it, something!