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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.

monster12valve 02-21-2010 05:58 PM

if i cut the rubber hose going from the afc to the wastegate do i plug both ends? do i plug the afc side and the wastegate side?

wes-cummins 02-21-2010 07:38 PM

YEA PLUG BOTH ENDS 2 KEEP DIRT OUT OF THE WASTEGATE, IF YOU CANT GET MORE BOOST WITH THE WASTEGATE TIED,THEN SOMTHINGS WRONG, DOES IT STILL SMOKE WHEN UR AT 18 PSI?

monster12valve 02-21-2010 07:42 PM

i blocked it and it gets 20-22psi now with no smoke... i think im outta fuel now?

tpcdrafting 02-21-2010 07:54 PM

Make sure the gov. arm isn't going under the plate. Had to adjust mine when we put in the 11 plate for the first time. Before adjustment it was around 18-20, then the most it ever made was 30. I carved my stock plate to look like a 1/4 pipe and it makes 40 psi now and SOPometer says another 30-50 hp.:tu:

Diesel Dawgs Performance 02-21-2010 09:45 PM

Make sure if your using a boost elbow that its not the adjustable one. You might have it adjusted down.

wes-cummins 02-22-2010 05:10 PM

i would make sure the gov arm aint going under the plate, and mabey slide it ahead a little, to get more fuel.:w2:


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