Supercharged WTQ ?

[Westrock]

Speaking of eliminating the transmission, I once got a U-Haul truck that was based off like a late 80's F250 Diesel (not turbo diesel). It had 1 gear for forward. It took forever to accelerate and by the time I was at 60 MPH I had to keep it floored just to maintain that speed (and that was 60 MPH at only about 3500 RPM on a single speed tranny)

[dustylax]

had a turbo deisel on the dyno 2 days ago....338whp and 870wtq, both at 2300 rpm's...redline was 3k and there was so much smoke the fire department came

[...m...]

Originally Posted by dustylax

had a turbo deisel on the dyno 2 days ago....338whp and 870wtq, both at 2300 rpm's...redline was 3k and there was so much smoke the fire department came

...and that's also why your rotrex dynometer chart cuts off at 7300 RPM - if it held its torque all the way up to 8500 RPM, it'd be pulling another 51 horsepower...

...to look at it another way, set that rotrex-boosted motor's rev limiter down at 5300 RPM, and you'll have exactly what you're looking for (200 peak foot-pounds and 200 peak horsepower, both) but why cut it short when the motor's capable of spooling up an additional 3200 RPM for 143 more horsepower?..

...i think what you're really looking for isn't torque to deliver less power, but rather the most torque down low you can squeeze out of a 2ZZ-GE...the really powerful turbos tend to spool up high and drop off quickly, ranging from 175-200 foot-pounds between 4000 and 7000 RPM, while the newer superchargers generally deliver a flatter torque curve down low, running a steady ramp up from 140-190 foot-pounds between 3000 and 8500 RPM...

...other than ronin's car, i haven't read of many boosted 2ZZ-GEs delivering much more than 200 ft-lbs (although it wouldn't suprise me if some of the celica GT people have killed motors running extreme torque setups) but regardless the only way they could keep horsepower down at those greater torque numbers would be by setting the motor's rev limiter substantially lower...

[Demonized]

Originally Posted by ...m...

...and that's why your rotrex dynometer chart cuts off at 7300 RPM - if it held its torque all the way up to 8500 RPM, it'd be pulling another 51 horsepower...

...to look at it another way, set that rotrex-boosted motor's rev limiter down at 5300 RPM, and you'll have exactly what you're looking for (200 peak foot-pounds and 200 peak horsepower, both) but why cut it short when the motor's capable of spooling up an additional 3200 RPM for 143 more horsepower?..

...i think what you're really looking for isn't torque to deliver less power, but rather the most torque down low you can squeeze out of a 2ZZ-GE...

I don't even understand what he wants to do...

But you've taught me alot in this thread.

[dustylax]

LOL i love how everyone is reading into this more than a simple question to see how much torque you can get out of a screw type.

[ChrisB]

Originally Posted by dustylax

LOL i love how everyone is reading into this more than a simple question to see how much torque you can get out of a screw type.

But that isn't the question you asked. You have stated that you want high torque at high RPM and low (relatively) HP. That isn't possible. The math given to you doesn't matter whether it is an NA engine. A turboed engine. A roots blown engine. A screw-type SC engine. Or a centrifugal-charged engine. It is always the same exact math. It isn't an approximation of anything. HP is derived from the value of the torque at any given RPM...period. A dyno doesn't measure HP. It measures torque and RPM and calculates HP with the math you were given.

To have an engine with high torque and relatively low HP, the torque peak has to occur at a relatively low RPM. You clearly demonstrated that with your turbo diesel dyno run you commented on. And, unlike the diesel you dynoed, if you want the engine to continue to higher RPMs, the torque has to fall off dramatically to keep the HP from going through the roof.

[dustylax]

Originally Posted by ChrisB

But that isn't the question you asked. You have stated that you want high torque at high RPM and low (relatively) HP.

no, i never once said that, please quote me if you can because maybe it was missread, or maybe i worded something wrong. i am not after a high rpm or low rpm or anything specific at all, im just curious to see how much wtq people have gotten at any point with a screw type. Everyone else keeps bringing up rpm's and all sorts of other info, im not throwing any more wrenches into this, just looking for the original question of how much tq people have gotten, plain and simple.

[ChrisB]

Ahh...peak torque is a simple question. Everyone is talking about math and RPMs because you originally asked for examples of torque around 210 with HP under 300. Since HP is derived from torque and RPM, that is where all this other stuff is coming from. Quite a different question. We're all just trying to help you with something you don't want. Sorry.

Fred's FrankenLotus may have the highest supercharged torque on a 2ZZ and I believe he has posted dyno charts here somewhere. He has a monster screw type (not a roots) supercharger on that car.

Edit: Here is a link to his dyno chart:
Its Alive! Big SC Power in the BWR FrankenLotus

WHTQ = 259

[dustylax]

Originally Posted by ChrisB

Ahh...peak torque is a simple question. Everyone is talking about math and RPMs because you originally asked for examples of torque around 210 with HP under 300. Since HP is derived from torque and RPM, that is where all this other stuff is coming from. Quite a different question. We're all just trying to help you with something you don't want. Sorry.

Fred's FrankenLotus may have the highest supercharged torque on a 2ZZ and I believe he has posted dyno charts here somewhere. He has a monster screw type (not a roots) supercharger on that car.

Edit: Here is a link to his dyno chart:
Its Alive! Big SC Power in the BWR FrankenLotus

WHTQ = 259

ah thank you.

everyone started throwing the math into it and i really just wasnt looking for too detailed of an explanation, just some numbers to compare because torque can be generated from tuning or other variables like inlet temp's, from meth or different intercoolers etc. i am trying to look a little further into myself but w/o seeing some other examples before knowing other data i cant really start to figure anything out for myself.

[...m...]

Originally Posted by dustylax

everyone started throwing the math into it and i really just wasnt looking for too detailed of an explanation, just some numbers to compare because torque can be generated from tuning or other variables like inlet temp's, from meth or different intercoolers etc. i am trying to look a little further into myself but w/o seeing some other examples before knowing other data i cant really start to figure anything out for myself.

Originally Posted by ...m...

...the really powerful turbos tend to spool up high and drop off quickly, ranging from 175-200 foot-pounds between 4000 and 7000 RPM, while the newer superchargers generally deliver a flatter torque curve down low, running a steady ramp up from 140-190 foot-pounds between 3000 and 8500 RPM...

...other than ronin's car, i haven't read of many boosted 2ZZ-GEs delivering much more than 200 ft-lbs (although it wouldn't suprise me if some of the celica GT people have killed motors running extreme torque setups)...

...i suggest checking out the celica GT forums for more exotic power setups...