Solstice GXP turbo torque curve

not much of a curve, more of a flat line, but check it out (http://media.gm.com/us/powertrain/en/product_services/2007/HPT%20Library/Ecotec/2007%20LNF/2007_20L_LNF_Solstice_SAE.pdf)

How could the curve be so flat? Is there software keeping it under 260tq?

http://i54.photobucket.com/albums/g112/Z28x/260GXP.jpg

My 2.0T Audi is rated at 207 torque flat from 1800 up to about 5000 rpm where it finally starts to taper down to 200 at 5100.

Modern day turbo setups seem to be capable of producing some very drivable torque curves.

Now that is cool!

The GXP should be a fun car to drive

A turbo I4 making max HP at 5300 RPM... right ;)

A turbo I4 making max HP at 5300 RPM... right ;)

Mine peaks at 5100. It's an I4 turbo of the same displacement.

Turbos often lower the peak power RPM of what is mostly, otherwise, the same motor.

The 1.8L I4 n/a in the MX5 miata (back when there was a turbo mazdaspeed varient) reached peak power at 7000 rpm. The turbo version? 6000rpm.
Not to say it couldn't rev further, but that's where peak power was reached.

Threxx, those 1.8T take to modding pretty well, don't they? Thats what I was getting at.

GM nuetered this motor, it'll be interesting to see how far a couple hundred bucks will go.

Threxx, those 1.8T take to modding pretty well, don't they? Thats what I was getting at.

Mine is the 2.0T. A revo tune on 93 octane will boost it from 200hp to 260 and 207 tq to 290tq. Supposedly reliably, but I'll be damned if I'm gonna spent 600 bucks on a program on a car that I'll only be driving for 20k more miles. Then again in a way that could be a blessing so to speak if the potential reliability under the increased boost isn't actually so great- but I'd be afraid it would blow up on me during the lease and I'd end up having to buy this car due to breach of contract and I do NOT want to buy this car.:o

Wow, that's pretty sweet.
But yeah with THAT FLAT of a curve, you gotta think the computer is keeping it tamed a little.

Cars with this motor will be hitting 300whp easily.

That's definitely flat.

But what's the throttle response like? How much power does it make in part throttle conditions? Is it very linear? 260hp out of 2 litres is fairly high strung, it'll interesting to see how well GM handled the compromises.

Looks like it is probably the work of a pretty small turbo.

Just from that curve it looks like the GXP will have a very tiny turbo like the T25. If it drive like a 2g with a T25 the throttle response with be right there with almost no lag, but it runs out of CFM right away too, thus the pathetic low RPM HP peak. but flat torque curve
I'm sure there will be lots of aftermarket turbos fro them though.
Just wonder if the engine can handle 25psi on a serious turbo like the DSM's

Just from that curve it looks like the GXP will have a very tiny turbo like the T25. If it drive like a 2g with a T25 the throttle response with be right there with almost no lag, but it runs out of CFM right away too, thus the pathetic low RPM HP peak. but flat torque curve
I'm sure there will be lots of aftermarket turbos fro them though.
Just wonder if the engine can handle 25psi on a serious turbo like the DSM's

It should be noted that throttle response will be good, but it will not be instantaneous due to the limitations of a turbo engine (i.e has to build up boost and the engine will almost certainly be dumped with fuel before WOT)

Pretty nice curve, i too bet its limited do to somthing.

OTOH, my buddy Will who may post in here later, has a 99 SS, hotcammed car, and his curve is almost as flat as that from say 3k-6k. :)

If I don't get a Camaro, I plan on getting one of these and putting a gnarlier turbo upgrade.

SWEET TQ curve. Reemember, the majority of these will NOT be heavily modded, so having a small turbo with very quick response will make for an awesome car off the showroom floor.

Dan

Pretty nice curve, i too bet its limited do to somthing.

OTOH, my buddy Will who may post in here later, has a 99 SS, hotcammed car, and his curve is almost as flat as that from say 3k-6k. :)

Just for you, Jeff

http://img.photobucket.com/albums/v314/SSCamaro99_3/Dyno2.jpg

I feel bad for the 2.0 S/C Cobalt owners....they still think the LSJ will live on....right....;)

not much of a curve, more of a flat line, but check it out (http://media.gm.com/us/powertrain/en/product_services/2007/HPT%20Library/Ecotec/2007%20LNF/2007_20L_LNF_Solstice_SAE.pdf)

How could the curve be so flat? Is there software keeping it under 260tq?


It certainly seems so. They probably want to make sure that it's durable.

With a flat torque curve like that, it'll accelerate very well for 260hp, just like the Mercedes V6 engine which, at 268hp, is significantly faster than the 298hp (according to Nissan) V6 in the G35 (see G35 and C350 manual acceleration times).

I feel bad for the 2.0 S/C Cobalt owners....they still think the LSJ will live on....right....;)

That blown motor with probably make significantly better top end power than this turbo motor. This thing will run out of breath fast after 5500 :(

That blown motor with probably make significantly better top end power than this turbo motor. This thing will run out of breath fast after 5500 :(


yes, according to the dyno graph. Odd that a S/C engine has a higher rpm limit then a turbo.

But it looks like the turbo will blow it away anyways.

If you consider the torque curve as an indication of the ability of the engine to swallow up air, it ought to be PLAINLY clear that the engine is being electronically manipulated. The boost is controlled to maintain a specific torque value, for reasons that I could guess at (driveability/feel targets, design torque limits, etc).
Virtually every turbo car on the road today does this to a degree. If left to run "however," it would have that rolling hill-type torque curve that every carb'd dyno graph shows.

EDIT- I'm giving a Sky Redline serious consideration. Outside of Corvette, it's been a LONG time since a GM car made stop and REALLY check it out.:)

yes, according to the dyno graph. Odd that a S/C engine has a higher rpm limit then a turbo.


That really doesn't really make a diference IMHO, the turbo is likely very small and makes little power at peak due to its hairdryer size.

thats as flat as this girl's chest I went to high school with