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-   -   boost question (https://www.dieselbombers.com/5-9l-12v-performance/44246-boost-question.html)

monster12valve 02-20-2010 03:59 PM

boost question
 
i have a 100plate, bhaf, 4in mbrp turbo back, star cranked and a boost elbow... when i get on it i am only getting 18lbs of boost. i check for leaks cant find any. what else would cause this?

94 12valve 02-20-2010 04:30 PM

check the air line to the afc and make sure that its moving

9412Valve 02-20-2010 05:50 PM

Well.. with my 94 I was only hitting.. around 30 psi when I got on it.. with a 0 plate, boost elbow, injectors from a 97 truck and 181 DV's.. The wh1c won't give _that_ much boost will it? I'm not an expert though. :w2:

94 12valve 02-20-2010 06:26 PM

most I ever saw out of mine was 36psi.

monster12valve 02-20-2010 07:04 PM

when i lock the tc and floor it the boost gauge shoots up to 16-18psi and stops there like the wastegate is opening.

joey 02-20-2010 09:17 PM

Your waste gate could be bad mabe wire it shut and see what that does. Just a thought.

12valvetater 02-20-2010 10:08 PM

Check and recheck all connections. It's been awhile since I've drove my truck but it think I was making like 34ish. That's with the h1c. My hx I was pushing 48lbs.

94 12valve 02-21-2010 05:52 AM


Originally Posted by monster12valve (Post 499610)
when i lock the tc and floor it the boost gauge shoots up to 16-18psi and stops there like the wastegate is opening.

did you check the air line to the afc?

monster12valve 02-21-2010 01:16 PM

yea. all connections were good. i blocked the line that goes to the afc now she does 26 psi. wg must be bad thanks guys:c:

R&RDiesel 02-21-2010 02:32 PM


Originally Posted by monster12valve (Post 500089)
yea. all connections were good. i blocked the line that goes to the afc now she does 26 psi. wg must be bad thanks guys:c:

Could be waste gate, but maybe the diaphram inside the afc has a hole in it, might want to check that as well just to be sure. Most likely waste gate though, if you have a boost elbow you can just eliminate the wastegate for the most part.


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