boost woes
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Postmaster
Joined: Nov 2006
Posts: 2,609
Likes: 0
From: somerset KY
boost woes
i need some help guys. i mentioned awhile back about my turbo not boosting much lately. my EGTS are staying high, and my boost will barely hit 20 poundsfor a brief time with a moderate load, in drive, to the floor on a hill at 70 mph with 3,000 rpms. cruising with a load, i'm lucky to make 5#. any ideas? hopefully the turbos going bad, to make way for a new one =). but, no shaft play, and my compressor wheel is nice and smooth. with just 6,700 pound trailer cruising along my egts are hittin 850* in od.
Lead Driver
Joined: May 2007
Posts: 8,606
Likes: 13
From: Belair md
20 psi is really good for your mods, its all i can do to touch 20 psi for a split second and i have to hold mine in gear to almost 3400 to even try.
- wot in mine at 3000 rpm is roughly 15-18 psi
-towing a load in od means low rpm's. 7k at low rpm and only hitting 850 is really good as far as i'm concerned.
- cruising with or without a load i make basicly no boost, the gauge wont climb till i am on the throttle down geared.
- only time i get boost on a cruise is 70-80 mph on light hills, i can build 5-10 psi but the rpm is up between 2000(70) and 2500(80) at that point.
- 55mph is 1500 in my truck, that = 0 boost for me.
- wot in mine at 3000 rpm is roughly 15-18 psi
-towing a load in od means low rpm's. 7k at low rpm and only hitting 850 is really good as far as i'm concerned.
- cruising with or without a load i make basicly no boost, the gauge wont climb till i am on the throttle down geared.
- only time i get boost on a cruise is 70-80 mph on light hills, i can build 5-10 psi but the rpm is up between 2000(70) and 2500(80) at that point.
- 55mph is 1500 in my truck, that = 0 boost for me.
Logistics Pro
Joined: Oct 2004
Posts: 4,738
Likes: 103
From: FL
With stock injectors?? what setting is you DP on??? That some boost from stock sticks! Like c00n said, most are happy with 20ish from stock sticks...
-Robb
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Posting Guru
Joined: Mar 2008
Posts: 1,669
Likes: 1
From: Billerica, MA
ya i have stock injectors, 4.10's, and in the 80 horse setting i can get like 26 psi, on the 120 setting i can get like 27-28 psi. And i'm soon getting stage 2 DIY's!!
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Logistics Pro
Joined: Oct 2004
Posts: 4,738
Likes: 103
From: FL
-Robb
Posting Guru
Joined: Mar 2008
Posts: 1,669
Likes: 1
From: Billerica, MA
Y i read on here somewhere that you can run 35psi but only short bursts. Its ok i plan on an H2E and a Spearco 6.0 intercooler from black widow. My only fear is that i will soon be into head stud range..... and i dont want to do those.
Posting Guru
Joined: Mar 2008
Posts: 1,669
Likes: 1
From: Billerica, MA
I dont know if it is or not, it could be because i needed to get a new part for it that was only on the cali truck but Rob posted a picture for me that was describing a cali truck and my truck didnt have that part on it. (A diaphram off the fuel pump maybe???)
Posting Guru
Joined: Sep 2004
Posts: 1,096
Likes: 2
From: Ohio
Everyones gagues read a little differently, if he is hitting a TRUE 25 plus, he has one of the BEST running OBS in the country on stock sticks, we all know that.
2 stroke,
Honestly, empty on flat ground, stock sticks with ANY programmer you should see 1 to three pounds of boost, and EGTs should be 600to 650. Now this is with a GOOD set of gauges, and the sending unit IN the manifold, NOT in the pipe itself. That will throw you WAYY off. If your sending unit is in the drivers manifold, right at the rear of it where the flat spot is, then you are running REALLY well as coon said. Honestly with that weight in OD you should see about 1000 to 1050 if you have a 4.10 auto truck. If your seeing those numbers ( your 850 ) and you have the sender in the correct location, I would start looking for a new gauge.
2 stroke,
Honestly, empty on flat ground, stock sticks with ANY programmer you should see 1 to three pounds of boost, and EGTs should be 600to 650. Now this is with a GOOD set of gauges, and the sending unit IN the manifold, NOT in the pipe itself. That will throw you WAYY off. If your sending unit is in the drivers manifold, right at the rear of it where the flat spot is, then you are running REALLY well as coon said. Honestly with that weight in OD you should see about 1000 to 1050 if you have a 4.10 auto truck. If your seeing those numbers ( your 850 ) and you have the sender in the correct location, I would start looking for a new gauge.
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
My 95 which was pretty much stock with TEE5 programming (stock) hit 20 psi empty. I was amazed when I measured it. So I took my tymar, fuel pressure shim, and 10K mod off and still hit 20 psi. its possible.