[ctrlz]

As many have noted, you cannot get full boost in first gear with this car, at least not with the 6-speed.

Anyone know what minimum speed is required to get full boost? I was playing with this today, and it seems to be about 32 mph (51 km/h).

 

[black_linear]

Not exactly sure, but I will check it out on my way home.

I do know that on my Linear, it stops producing full boost at around 130 mph:suprised;. That is probably not the case for those of you with Arcs and Aeros, but i am assuming it's there for the standard H-Rated tires on a Linear.

I haven't had a chance to see if with the PPC installed, that is still the case.

 

[Go Green]

I don't know, but I'm going to a racetrack this weekend, and I *MAY* have a chance to take the '05 Aero out for a spin on it. I'll let you know if the boost kicks out, if I get a turn on the track!

 

[ctrlz]

I haven't had a chance to see if with the PPC installed, that is still the case.

To me it is MORE noticeable with the BSR tuning. There is so much more boost in 2nd and 3rd that you miss it in 1st!

 

[DavidMorgan]

To me it is MORE noticeable with the BSR tuning. There is so much more boost in 2nd and 3rd that you miss it in 1st!

I also have BSR tuning.. For me 1st is just to get the wheels turning; it's only after I am in 2nd (and that doesn't last long) that I appreciate the power from the turbo. Have never thought about pushing it all the way in 1st, accelerates so much better in the other gears.

 

[ctrlz]

Have never thought about pushing it all the way in 1st, accelerates so much better in the other gears.

Yes.

I think the car was set up this way to prevent launching it too hard. It does seem faster if you get out of first gear pretty quickly.

 

[DavidMorgan]

I am not sure, I'll check tomorrow, but I cannot say that I have noticed the trurbo disactivating. I hate that word.. turbo stopping. In 3rd for instance at about 6,300, that's 180kph or 112mph, the power drops but I think that is just a limit on the revs to avoid mistreating the engine or is it the turbo ?

 

[Diggs]

I've been seeing all these 0-60 times for our cars and how it's slow because:
1. We have limited boost in 1st.
2. The 6 speed has to shift to 3rd to hit 60.

I wonder how fast one could hit 60 by starting in 2nd with the 5 speed? Just tach it up to 3 grand or so where you have peak boost and let her rip. No need to shift.

 

[ctrlz]

In 3rd for instance at about 6,300, that's 180kph or 112mph,

The rev limiter apparently is set at 6275 rpm.

 

[BlackSaab]

The rev limiter apparently is set at 6275 rpm.

Seems so an there is a boost limiter when going high speed and high revs. You can see it even at the turbo needle going down and away from the red. Espacially at high speeds. So I guess it's better to shift let's say in the 5th gear when your in the 4th gear at 5000 rpm. As the boost will be shortly limited in the 4th but in the 5th the boost is fully available.

I allready saw this happening on the autobahn. Somehow/sometime frustrating. But I guess it's a safety thing for the eninge and the turbo.

Does someone know if there is a "turbo/boost" decrease when the turbo has been "used" much let's say because of a few overtaking situations so that it cools down or is the boost (except the high rpm/high speed boost block) allways full power?

As far as I know the electronic even realizes how "fast"/"hard" you step on the gas and responds to it. So giving slowly gas won't let you feel the kick, but flooring it should let you feel the kick. Somehow intelligent engine/power management - but I'm not sure about that.

 

[ScoopSS]

isn't the gas fly by wire? that would explain the kick you feel only by flooring it.

have you tried releasing the gas to open the recirc valve then hitting the gas hard again (at the high rpms where you feel the turbo "stops")

 

[BlackSaab]

Releasing the gas at high speed and high rpms to recover the boost doesn't work. tryied it allready. The T8 (i guess) relaise the speed and rpm and won't allow high boost. It's a "feature" (*grrrr*) also stated in the owners manual - something like "at high speed boost will be cutted to prevent fast acceleration at high speeds...bla bla.." - guess a security thing to calm you down when going fast and faster and faster and.....

Didn't had the problem in a 9-5 Aero. har har....But on the other hand...I don't mind if it takes a few seconds more to reach top speed when going over 180 km/h. The most critical part is how the car and the boost behaves at lower speed for fast overtaking etc. and there it's just a beauty.

 

[ctrlz]

isn't the gas fly by wire? that would explain the kick you feel only by flooring it.

Yes, the throttle is fully electronic. Moving the pedal only submits your "torque request" to the ECM. There are different "smoothing functions" performed to prevent sudden jolts. Some of these are outlined in various factory literature.

 

[Turbopowered]

I do know that on my Linear, it stops producing full boost at around 130 mph:suprised;. That is probably not the case for those of you with Arcs and Aeros, but i am assuming it's there for the standard H-Rated tires on a Linear.

The boost cuts a little, but I've pushed mine to 140 no problem. To be honest I wasn't exactly looking at the boost gauge, I was pretty focused on driving at that point.

I wonder how fast one could hit 60 by starting in 2nd with the 5 speed? Just tach it up to 3 grand or so where you have peak boost and let her rip. No need to shift.

I haven't tried that, its an idea but I don't think you would get a good launch because it would want to bog down. Have any of you tried launching from 5k RPM? That seems to work pretty well for me . I do race alot of ricers (some Tiburon GTs V6, Civics, etc) from a dead dig I'll stay with them off the light for about 10-15 feet, then they destroy me. When I hit full boost in 2nd I gain on them, but in a quarter its too short to catch them. Doing a 30 roll I'll punch it in 2nd and smoke alot of them though .

 

[mike saunders]

Since T5, Saab Trionic engine management has used a boost limit in 1st and 2nd gears. This apparently extends the life of drivetrain components by limiting the amount of torque delivered.

This limit can be defeated somewhat in T5 with a MBC, and to less of a degree in a T7 with an SMBC. T8 probably has some of the same limits, but in all cases, most ECU mods will increase the allowable boost in both first and second gears, and the redline in all gears.

Most of the 9-3SS models are at a HP/torque disadvantage to begin with, likely because they're "detuned" ftrom the factory to counter the whining about torque steer from the motoring press. Since most of your cars are still under warranty, it's natural that few of you have explored HP options, so this is still uncharted territory.

The NG900/old 9-3 crowd are pushing their engines to 270-300 bhp, so there's definitely a lot more power to be eked out of the 9-3SS engines.

 

[voodoochile]

The boost cuts a little, but I've pushed mine to 140 no problem. To be honest I wasn't exactly looking at the boost gauge, I was pretty focused on driving at that point.

This is my issue also. I wish I had a datalogger. Most of the issues raised in this thread I have experienced in one form or another, but usually I'm pretty busy when things start happening.

There is definitely some form of boost limitation, even outside of first gear, unrelated to the revs. I can easily activate it, even as low at 45 MPH. I am finding that I can reliably run about 24psi without encountering this, but any higher and it kicks in. It is possible for me to realize up to 28psi, but only briefly... then it cuts abrubtly to about 16 for a short bit.

In most driving, it still runs mainly between -15 and +8. If you get on it for more than a 1/4 second (full travel), the boost climbs very fast, and you can hear a large difference in the exhaust note that is not present without the tuning software in the ECM. I mean, it's a BIG difference in exhaust note.

 

[ScoopSS]

i tried launching the linear 5spd in 2nd....not a good idea.

im still not sure what happened, but I revved up to like 4000, dropped the clutch, the RPMs went from 4000-6000 extremely slow, tires BARELY moving, when i mean slow, i mean it took like 6 seconds and after all this all i could smell was clutch. The car was moving, really slow but didn't stall.

 

[mike saunders]

There is definitely some form of boost limitation, even outside of first gear, unrelated to the revs. I can easily activate it, even as low at 45 MPH. I am finding that I can reliably run about 24psi without encountering this, but any higher and it kicks in. It is possible for me to realize up to 28psi, but only briefly... then it cuts abrubtly to about 16 for a short bit.

This is the normal function of the boost pressure solenoid sending its signal back to the ECU, which determines whether to back off the boost.

The momentary spike of 28 is likely time governed, which I believe is a feature of T8 that enables you to punch it for several seconds.

 

[Diggs]

i tried launching the linear 5spd in 2nd....not a good idea.

im still not sure what happened, but I revved up to like 4000, dropped the clutch, the RPMs went from 4000-6000 extremely slow, tires BARELY moving, when i mean slow, i mean it took like 6 seconds and after all this all i could smell was clutch. The car was moving, really slow but didn't stall.

Damn. It was worth a try though.