As you guys probably know the EVO 8 and Dodge Neon SRT4 are 2.0L Turbo engines....With nice HP and TQ number because of the FI. My question is why when we turbocharger our cars we can never seem to get too much TQ from them? I mean if we have a turbo that spools up at 3000RPMS we are under boost for 6000RPMs. I was justy wondering why its so hard to get TQ out of our engine can anyone of you FI guys clue me in on why this is?

 

I think it has to do with our engine having such a short stroke and high rpm. But I could be totally wrong.

 

because it's a simple physics formula and you can't have a closer tq to hp with the 8000, 9000 redline because of it

 

I don't know what you means by not getting nice torque.

Last time I looked at my half tuned car dyno graph, the torque was 650Nm at 16psi. That's plenty for me

It all depends on the turbo.

 

Just like Spoolin said. It has to do with the bore and stroke. Two 4-cylinder engines can have the same displacement, but different bore/stroke. HP is what really matters anyway, not TQ.

 

I think you're mistaken there.

Well, first of all, the SRT4 has a 2.4 liter engine, not 2.0. It's torque rating is 245 lb-ft - aren't most bolt-on S2000 turbo kits somewhere in the low 200's for wheel torque? So more power and torque from a turbocharged S2000 engine.

The EVO VIII engine is 1997cc, identical to the F20C. But the compression ratio is only 8.8:1, so a LOT more boost can be run than in a stock S2000. Hence the 286 lb-ft of torque.

 

I'm 2.0 liters and 321 ft-lbs of torque.

 

I thought he was talking about torque relative to hp. Like with the EVO, torque is about the same as hp, whereas the s2k even when highly boosted has much less torque than it does hp.

 

No, it has a lot more horsepower than it does torque, and that's because it revs.

 

Rule of thumb is that the shorter the stroke, less torque but can rev higher.
If the engine can rev higher, then you can make up the torque by having higher multipliers in gearing.

See the gearing page on my signiture to compare the multiplied torque seen by the rear drivetrain or wheels.