LPT vs FPT ...what's the difference?

[Tony Rome]

Hello ...what's the difference between a low pressure turbo and full pressure turbo?

[Superaero]

About 75 hp and a ton of torque. Different ECU different turbo.

[Tony Rome]

How can I tell if I have an LPT or HPT? I have a T25 in my 94' CSE

[Twinsen]

FPT has a boost gauge.

[bmacb]

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.

[Tony Rome]

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.

[santeria600]

Do you have a boost gauge on your dash panel?

[Tony Rome]

Yes. I also have BPC on my rad

[saabTN]

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.

[bmacb]

You need a bpc plus you need a FPT ECU, very easy to do and well worth it.

[rawill]

Originally Posted by bmacb

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!

[V4LH4LA]

what he said ..always try to keep ur original ECU

[saabTN]

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.

[rawill]

Originally Posted by saabTN

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.

[saabTN]

Originally Posted by rawill

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 ?

[rawill]

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

[saabTN]

Originally Posted by rawill

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 ?

[rawill]

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.

[SaabKen]

Originally Posted by Tony Rome

Hello ...what's the difference between a low pressure turbo and full pressure turbo?

LPT =

FPT =




Next question please .............

[rawill]

Only two !!