Low boost numbers
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Senior User
Joined: Jan 2012
Posts: 130
Likes: 1
From: Scottdale, PA
Low boost numbers
I bought a 1986 with a hypermax on it. It also has the bb code injectors. 4" exhaust turbo back. It seems like it takes all kind of throttle to get boost to register on the guage. Then it maxes at about 8psi. That its climbing a hill at 65mph wide open. Kind of has me stumped. It isnt blowing any smoke (not that I want it to). How do I check for a boost leak?
Cargo Master
Joined: Feb 2010
Posts: 3,493
Likes: 3
From: NY
Just make sure all the connections are tight. If you want to be totally sure, just remove all the rubber part that air travels through and spray them down down with brake parts cleaner really good. That should eliminate your problems. On another note, 8 psi isn't bad for a IDI, what do your EGT's read when you are at 8 psi??
Elder User
Joined: Dec 2011
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From: Kodiak, Alaska
Yeah I would make sure you don't have an air leak but I only run about 10 psi then my waste gate opens 12+ is the danger zone these engines are high compression (21.5/1) low boost so 8 is ok if you don't have any air leaks you could adjust your waste gate a little I bet and get her up to 10 psi. Be carefull too much boost on a stock set up and you will be putting in new head gaskets.
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Senior User
Joined: Jan 2012
Posts: 130
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From: Scottdale, PA
Egts are reasonable. They hold at 10-1100 if I stay in it for a while, never go any higher than that though. I guess 8 isnt my complaint, but the rpm requires to get that is. Like I said, I only see that number at wot, at about 3k rpm. I would like some boost down low if that is possible.
Elder User
Joined: Dec 2011
Posts: 751
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From: Kodiak, Alaska
Oh I was thinking it was. Maybe bigger exheust but some of those non waste gated rigs are made to run low boost and if you are hitting 1100* now I would not give it any more fuel to get more boost
Thread Starter
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Senior User
Joined: Jan 2012
Posts: 130
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From: Scottdale, PA
I am wondering about my pyro actually. I think ot is out of whack. Always reads higher than it ought to. At idle it reads 450 but my IR thermometer reads 245 at the same site.
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Cargo Master
Joined: Feb 2010
Posts: 3,493
Likes: 3
From: NY
Yeah, thats the non-gated turbo's. If you were towing, egt's would be higher and boost would be around 12-13 i'd say.
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Cargo Master
Joined: Feb 2010
Posts: 3,493
Likes: 3
From: NY
You mean swap a better turbo in? For the cost that would set you back, you should put in a intercooler to lower your egt's so you can increase the fuel on your old pump or upgrade to a DPS pump. I am upgrading to a DPS pump soon because I am just about out of fuel on my non-turbo fuel pump. The dps pumps are better because they are set to input the fuel to spool up the turbo.
From their website......
"........only good if the engine has either a factory or aftermarket turbocharger. We readjust the fueling and timing curve to take full advantage of a turbo, and normally raise the governed RPM to 3800. The max fuel delivery capability of the pump is also raised. Although we can do a turn-up on any rotary pump, the ideal pump to use is a "XX31" model, found in the '93 - '94.5 idi. We can bring an "XX29" pump up to the same fuel delivery, but the price will go up due to the extra machining involved. Maximum gains are seen when a matched set of injectors are used."
Diesel Performance Specialists, Inc. - The Diesel Performance Specialists
From their website......
"........only good if the engine has either a factory or aftermarket turbocharger. We readjust the fueling and timing curve to take full advantage of a turbo, and normally raise the governed RPM to 3800. The max fuel delivery capability of the pump is also raised. Although we can do a turn-up on any rotary pump, the ideal pump to use is a "XX31" model, found in the '93 - '94.5 idi. We can bring an "XX29" pump up to the same fuel delivery, but the price will go up due to the extra machining involved. Maximum gains are seen when a matched set of injectors are used."
Diesel Performance Specialists, Inc. - The Diesel Performance Specialists
Cargo Master
Joined: Feb 2010
Posts: 3,493
Likes: 3
From: NY
