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  #1  
Old 25th April 2012
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Default LPT vs FPT ...what's the difference?

Hello ...what's the difference between a low pressure turbo and full pressure turbo?
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  #2  
Old 25th April 2012
Superaero Superaero is offline
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About 75 hp and a ton of torque. Different ECU different turbo.
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  #3  
Old 25th April 2012
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How can I tell if I have an LPT or HPT? I have a T25 in my 94' CSE
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  #4  
Old 25th April 2012
Twinsen Twinsen is offline
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FPT has a boost gauge.
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  #5  
Old 26th April 2012
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Strictly speaking you have a full pressure turbo if you have a FPT ECU, a boost pressure controller (BPC) and associated hoses. The BPC lives near the top of the radiator on the drivers side and it has three hoses the run to various locations on the turbocharger to allow for wastegate control. In its normal configuration, this setup will also have a boost gauge.
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  #6  
Old 26th April 2012
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Ahhh ...I see. I do have the BPC on top of my rad with 3 vacuum hoses going to various locations. So I'm of the fortunate group with FPT and T5 ECU. Tuning this car will be fun.
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  #7  
Old 27th April 2012
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Do you have a boost gauge on your dash panel?
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  #8  
Old 27th April 2012
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Yes. I also have BPC on my rad
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  #9  
Old 27th April 2012
saabTN saabTN is offline
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i have a lpt and was wondering what do i need to do to upgrade? do i need to install a bpc valve? my cs is an auto.
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  #10  
Old 27th April 2012
bmacb bmacb is offline
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You need a bpc plus you need a FPT ECU, very easy to do and well worth it.
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  #11  
Old 28th April 2012
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Quote:
Originally Posted by bmacb View Post
You need a bpc plus you need a FPT ECU, very easy to do and well worth it.
Not quite or maybe, a BPC yes, maybe get an FPT ecu but if it was me I would get a spare ecu, (as long as it is aT5.5 and not a T5.2, unless you have a rare T5.2 car) and get some friendly T5 suite tuner to tune it to stage 1 or stage 2.

Oh and however you do it, certainly worth it!
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  #12  
Old 28th April 2012
V4LH4LA V4LH4LA is offline
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what he said ..always try to keep ur original ECU
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  #13  
Old 28th April 2012
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This is my goal. Update my brakes, lowering springs, and some suspension. Once I get that taken care of then I will go staging my motor.
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  #14  
Old 28th April 2012
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Quote:
Originally Posted by saabTN View Post
i have a lpt and was wondering what do i need to do to upgrade? do i need to install a bpc valve? my cs is an auto.
MY 97 CD has nothing else done to it except a stage 1. The original ecu is safely stored away. It make a nice improvement to the car. Nice cruising car.
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  #15  
Old 30th April 2012
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Quote:
Originally Posted by rawill View Post
Not quite or maybe, a BPC yes, maybe get an FPT ecu but if it was me I would get a spare ecu, (as long as it is aT5.5 and not a T5.2, unless you have a rare T5.2 car) and get some friendly T5 suite tuner to tune it to stage 1 or stage 2.

Oh and however you do it, certainly worth it!
Instead of hooking up a bpc, could I install a boost controller ?
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  #16  
Old 30th April 2012
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Yes you certainly could. I wouldn't but then I am biased and I do my own tuning of ecus.

If you have a look on here there is another thread where I got into a "discussion" about the ECU tune approach compared with an MBC. I will try to find the thread and put a link on here.

http://www.saabcentral.com/forums/sh...32#post2186032
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Last edited by rawill; 30th April 2012 at 04:29 AM.
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  #17  
Old 30th April 2012
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Quote:
Originally Posted by rawill View Post
Yes you certainly could. I wouldn't but then I am biased and I do my own tuning of ecus.

If you have a look on here there is another thread where I got into a "discussion" about the ECU tune approach compared with an MBC. I will try to find the thread and put a link on here.

http://www.saabcentral.com/forums/sh...32#post2186032
Would a boost controller not be as good as a bpc ?
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  #18  
Old 30th April 2012
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In my opinion yes and no.

With an APC/BPC valve, boost is limited in 1st and 2nd.
The only limit with an MBC is where you set the boost.

With the BPC:
If the engine gets into knocking/detonating conditions the ECU pulls the boost off to save the engine. With an MBC that can no happen.
See the discussion on the other thread.

Also with a tuned ecu you get a normal car until you put your foot to the floor.
The car only tries to make boost from 2250rpm to 4500 rpm at full throttle.

With the MBC it is there all the time, and way past 4500, at that point all you are doing is heating air, and creating a situation for knock.

With a BPC you can still drive the car like a normal car, same fuel economy or maybe improved fuel economy because of the changes to fueling and timing, and on a 2.3 more torque for the same reason.

An MBC only changes the boost potential.

But like I said, I am biased.
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  #19  
Old 6th May 2012
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Quote:
Originally Posted by Tony Rome View Post
Hello ...what's the difference between a low pressure turbo and full pressure turbo?
LPT =

FPT =




Next question please .............
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  #20  
Old 7th May 2012
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Only two !!
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