Boost Gauge Question
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Senior User
Joined: Jan 2004
Posts: 209
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From: Mount Airy, Md
Boost Gauge Question
Quick question as to boost level on my STOCK 99. I just finished puuting a set of gauges in and was wondering what the boost should be just driving around town? When I am cruising at 40-50mph just shows around 2 lbs. When I accelerate it gets closer to 10ibs. Been kinda busy getting the kinks worked out of it and tryng to get ready to go on vacation at the same time.
Also, if I am just sitting in my driveway and tap the throttle should it show any boost? Thanks, Tom
Also, if I am just sitting in my driveway and tap the throttle should it show any boost? Thanks, Tom
Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
2 lbs seems a little low to me, I usually hold around 4-5 lbs cruising, closer to 8 cruising 75@2000 rpms.
When you say accelerate, do you mean a gradual normal acceleration, or "stomping it" to WOT?
When you say accelerate, do you mean a gradual normal acceleration, or "stomping it" to WOT?
Laughing Gas
Joined: Oct 2009
Posts: 831
Likes: 2
From: Vacaville, CA
10 sounds about right under normal acceleration... you probably won't see any measurable boost just tapping the throttle in the driveway either, not enough time for the turbo to spool up. The only thing that seems a little low is the 2 lbs cruising (I'm running with a dp tuner and more fuel though), but sounds like everything is working tip top! Just some numbers to sorta lay down, under hard acceleration, like getting on the freeway, you should build around 12-14 and I would say 15-17 max at WOT with stock tunes...
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Senior User
Joined: Jan 2004
Posts: 209
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From: Mount Airy, Md
Thanks guys, I really appreciate the input. I guess now that I can see what's going on I will be noticing a lot more than before. Chris, I ran up the road again and gave it a boot in the butt and it did wind up to 12-14 on hard acceleration. Still haven't tried WOT. Never have done that unless absolutely neccesary. Other than race cars!!
More Turbo
Joined: Jan 2006
Posts: 687
Likes: 15
From: Lake Charles, LA
Not to worry. Mine does the same. Just easy cruising in town its right about 2lbs. In driveway its nil, give it throttle and it may budge a lil but not much. Take it on road for mild acceleration and its usually 7-10lbs, cruising highway at 70 and its at 3-5lbs. WOT in stock form gets about 17lbs, while it 80e or 120r it pegs out around 25lbs with a good seat of the pants feeling.
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Laughing Gas
Joined: Nov 2010
Posts: 915
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From: oriental NC.
my early 99 is 2-3 very light throttle will hit ten quick. wot it gets to about 18 and thats it, people here have told me its the early 99 program.
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5th Wheeling
Joined: May 2011
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Likes: 8
From: Stillwater, Ok.
You go 75 mph at 2000 rpm? Did you do something to it to go that fast? I'm right around 69 mpg at 2000rpm. I ask because I think my truck is most efficient at 2000 rpm and under and the speed limit here on some interstates is 75 mph. I like to get that speed at 2000 rpm.
Fleet Mechanic
Joined: Nov 2008
Posts: 1,573
Likes: 4
From: Seattle
You go 75 mph at 2000 rpm? Did you do something to it to go that fast? I'm right around 69 mpg at 2000rpm. I ask because I think my truck is most efficient at 2000 rpm and under and the speed limit here on some interstates is 75 mph. I like to get that speed at 2000 rpm.
i ain't rite
Joined: Mar 2005
Posts: 65,447
Likes: 5,517
From: Marlboro Mental Hospital.
i can regularly get over 25 lbs boost when running in 80 econo and over 30 lbs in 140 race mode at WOT.
the only problem i have is the truck defuels at 22lbs boost, so i had to put a pressure regulator set to 20 lbs in the line before the map sensor to fool it into thinking i am not making boost.
the only problem i have is the truck defuels at 22lbs boost, so i had to put a pressure regulator set to 20 lbs in the line before the map sensor to fool it into thinking i am not making boost.