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 Boost presure?
#661077
10/29/05 08:08 PM
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Joined: Aug 2002
Posts: 37
OP
Getting the Wheeling Fever
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I was just wondering what sort of boost presure is normal in a trooper? I have seen posts here mentioning 12 - 14 PSI?
The 2.8 4JB1-TC in my Jeep will go up to about 8 PSI but this engine is out of a bigger truck and maybe they limit it in some aplications more than others?
My gauge sensor is at the intake manifold.
Thanks
Randy
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Re: Boost presure?
[Re: EVguy]
#661078
11/02/05 04:46 AM
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Joined: Feb 2005
Posts: 101
Wheeler
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The turbomaster pages list two pressures for the turbo wastegate used on the 2.3 http://www.turbomaster.info/despieces_garrett/466272-0002.phpOn my 4BD1T the wastegate originally needed 20psi to open it (20 is only just acheivable). I've moderated this to 15psi and the engine runs much better with less backpressure. IMO trying to run more than 12psi without an intercooler is futile. The extra heat in the air and it's resulting expansion mitigates the extra boost and leaves you with only a few percent extra air molecules for a lot of extra restriction on the engine exhaust.
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Re: Boost presure?
[Re: EVguy]
#661079
11/02/05 05:32 PM
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Joined: Nov 2000
Posts: 29
Getting the Wheeling Fever
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My Trooper C223T runs 10 psi boost, foot on the floor at 3000rpm. I use 3000rpm as red line.
Steve
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Re: Boost presure?
[Re: Steve in VA]
#661080
11/04/05 05:39 PM
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Joined: Feb 2004
Posts: 78
Getting the Wheeling Fever
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+10 is just making heat unless you can intercool AND increase the pump volume. Without increased pump volume you are just wasting time.
86 Isuzu Trooper TD 5 speed
82 Isuzu Diesel I-Mark
86 300 SDL MB 126
85 300SD MB 126
82 300 D MB 123
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Re: Boost presure?
[Re: TX76513]
#661081
11/05/05 07:50 PM
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Joined: Aug 2002
Posts: 37
OP
Getting the Wheeling Fever
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I do have an intercooler and have turned up the pump.
BFN
Randy
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Re: Boost presure?
[Re: TX76513]
#661082
11/08/05 04:09 AM
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Joined: Feb 2005
Posts: 101
Wheeler
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Without increased pump volume you are just wasting time. Not quite, the extra boost increases the compression ratio.
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Re: Boost presure?
[Re: Dougal]
#661083
11/08/05 10:19 PM
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Joined: Feb 2004
Posts: 78
Getting the Wheeling Fever
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Without increased pump volume you are just wasting time. Not quite, the extra boost increases the compression ratio. More compression = heat. Need boost and fuel
86 Isuzu Trooper TD 5 speed
82 Isuzu Diesel I-Mark
86 300 SDL MB 126
85 300SD MB 126
82 300 D MB 123
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Re: Boost presure?
[Re: TX76513]
#661084
11/09/05 04:08 AM
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Joined: Feb 2005
Posts: 101
Wheeler
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Without increased pump volume you are just wasting time. Not quite, the extra boost increases the compression ratio. More compression = heat. Need boost and fuel The efficiency of your engine is directly related to the compression ratio. A higher compression ratio will give you more power out for the same fuel in.
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Re: Boost presure?
[Re: Steve in VA]
#661085
11/09/05 06:45 AM
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Anonymous
Unregistered
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My dad's '86 P'up with a C223T runs about 14psi from 2200RPM on. It's all stock, other than the motor being rebuilt. Definitely can tell when the boost comes in.
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Re: Boost presure?
[Re: Dougal]
#661086
11/11/05 05:44 PM
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Joined: Feb 2004
Posts: 78
Getting the Wheeling Fever
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Without increased pump volume you are just wasting time. Not quite, the extra boost increases the compression ratio. More compression = heat. Need boost and fuel Yes and to get more compression you need more fuel not just boost. You can achieve more fuel by adjusting the alda but only to a certain point. To move into the higher boost ranges and have effective results the pumps need to be modified to produce more fuel (beyond the mfg specs). The efficiency of your engine is directly related to the compression ratio. A higher compression ratio will give you more power out for the same fuel in.
86 Isuzu Trooper TD 5 speed
82 Isuzu Diesel I-Mark
86 300 SDL MB 126
85 300SD MB 126
82 300 D MB 123
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