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5-8 psi engine mods

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Old Sep 24, 2006 | 04:44 PM
  #1  
fitbmxseries1's Avatar
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From: fond du lac, WI
Car: 1988 trans am GTA
Engine: 350 tpi
Transmission: 700r4
5-8 psi engine mods

looks like i got my self into a huge expensive project!.. i got a hold of a turbo and some parts in the last few months and im looking to have a winter project! im going to be running 5-8 psi on an 88 gta with a 350 tpi, and im trying to figure out what im going to need to adjust the fuel and spark wiht out doing any ecm mods im pretty new to this but im trying to do reasearch but ive also learned asking questions helps alot too.
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Old Sep 25, 2006 | 12:47 PM
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From: Troy, Ohio
Car: 1987 Trans Am
Engine: 383
Transmission: TH400
Axle/Gears: 9 bolt 4.11
Adjustable FMU to raise fuel pressure and an MSD6A-BTM to adjust timing per pound of boost....what size turbo you have?
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Old Sep 25, 2006 | 03:27 PM
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fitbmxseries1's Avatar
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From: fond du lac, WI
Car: 1988 trans am GTA
Engine: 350 tpi
Transmission: 700r4
its a t3 turbo..... thats all i really know about it i got it for 25$ at a scrap yard no slop and it holds oil.i was told it will go up to 26 psi and the internal waist gate is set at 8 psi.( not 100% knowlageable about turbos yet but this winter ill have plenty of time while i install it.) ill probably be asking alot of questions on ajusting it correctly too.

i dont really want to run to much boost on the car its a lowmilage engine but ive been having intake manifold and plenum gasket problems ( replaced them twice already) next time i have to im just replacing my intake manifold. and i just want a smaller power gain seeing that i do drive it alot and i dont want to get my self in trouble.

Last edited by fitbmxseries1; Sep 25, 2006 at 03:31 PM.
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Old Sep 25, 2006 | 03:35 PM
  #4  
fitbmxseries1's Avatar
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From: fond du lac, WI
Car: 1988 trans am GTA
Engine: 350 tpi
Transmission: 700r4
oh forgot to mention i have an ajustable fuel pressure regulator. do i still need somthing to boost the pressure up?
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Old Sep 25, 2006 | 03:52 PM
  #5  
MaxxMitchell's Avatar
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From: shawnee, ks
Car: 87 Firebird
Engine: 5.3 76mm
Transmission: Rossler TH400, PTC converter
Axle/Gears: Strange 12bolt, 3.08s
Pic of the turbo. About how large is it? It might be too small, and actually choke your motor.

GL with the build. Injectors maybe another thing on your list.
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Old Sep 25, 2006 | 03:57 PM
  #6  
fitbmxseries1's Avatar
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From: fond du lac, WI
Car: 1988 trans am GTA
Engine: 350 tpi
Transmission: 700r4
its actually gunna be a remotemount so being smaller it should work better for that, right?........ i know RMT isnt very efficent but its gunna be the route im taking. ill get pics up on friday. the turbo is at my work im waiting for some one to verify what kind it is and if it works.
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Old Sep 25, 2006 | 10:41 PM
  #7  
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From: St Louis, MO
Car: 89 Iroc & 88 Firecird & 86 Camaro
Engine: 350 TPI & 305 TBI & 305 Carb
Transmission: 700R4
The adjustable fuel pressure regulator is nice but you will still need an fmu(fuel management unit). It will raise fuel pressure in relation to boost. Get an adjustable one like Ol'Blue stated.
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Old Sep 26, 2006 | 10:49 AM
  #8  
RDriedger's Avatar
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From: Manitoba, Canada
Car: 84 Firebird
Engine: 305
Transmission: 700R4
Axle/Gears: posi & 3.73s
Originally Posted by jocool
The adjustable fuel pressure regulator is nice but you will still need an fmu(fuel management unit). It will raise fuel pressure in relation to boost. Get an adjustable one like Ol'Blue stated.
Why not just get a boost referenced fuel pressure regulator? Like this http://store.summitracing.com/partdetail.asp?autofilter=1∂=AEI%2D13202&N=700+4294880914+115&autoview=sku
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Old Sep 26, 2006 | 11:06 AM
  #9  
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From: Troy, Ohio
Car: 1987 Trans Am
Engine: 383
Transmission: TH400
Axle/Gears: 9 bolt 4.11
Originally Posted by RDriedger
Why not just get a boost referenced fuel pressure regulator? Like this http://store.summitracing.com/partdetail.asp?autofilter=1∂=AEI%2D13202&N=700+4294880914+115&autoview=sku

Because it will only raise the fuel pressure on a 1:1 ratio...1 psi of fuel pressure for every pound of boost....An adjustable FMU increases the fuel pressure to any desired rate...as in 8 psi of fuel pressure per pound of boost and so on. This is a bandaid but it is a pretty darn good one...It CAN eliminate the need for larger injectors....You can only push stockers so far but, in the case of 8 psi he should be fine...but I'm not confident on the answer. You Could always go with 30#'s and start with lower base pressure so it idles fine and use an FMU to ramp the pressure up under boost...

A T3 turbo is more than likley too small. A T4 with a smaller A/R on the turbine side is still what you would need
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Old Sep 26, 2006 | 03:04 PM
  #10  
fitbmxseries1's Avatar
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From: fond du lac, WI
Car: 1988 trans am GTA
Engine: 350 tpi
Transmission: 700r4
im mostliklyl gunna put the turbo on ebay and get another one. i won a adjustable msd ignition on ebay last night for 150$, im pretty happy with that because how much they are new! im still trying to find an adjustable FMU now. and i may change my mind on the remote turbo thing. ill see when i have most of the parts.
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Old Sep 27, 2006 | 05:13 AM
  #11  
Ol'Blue's Avatar
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From: Troy, Ohio
Car: 1987 Trans Am
Engine: 383
Transmission: TH400
Axle/Gears: 9 bolt 4.11
Originally Posted by fitbmxseries1
im mostliklyl gunna put the turbo on ebay and get another one. i won a adjustable msd ignition on ebay last night for 150$, im pretty happy with that because how much they are new! im still trying to find an adjustable FMU now. and i may change my mind on the remote turbo thing. ill see when i have most of the parts.

Every once in a will a cartech Adjustable FMU pops up on Ebay...
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Old Sep 29, 2006 | 08:11 PM
  #12  
fitbmxseries1's Avatar
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From: fond du lac, WI
Car: 1988 trans am GTA
Engine: 350 tpi
Transmission: 700r4
yep i just saw one the other day when it ended. it was 75$ i wish i would have caught it eailer, and i saw another one that was going for alot of money but it came with other parts for a fueling system that i do not need
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