I have a question
Feb 16, 2009 | 11:47 PM
#16
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Joined: Jan 2009
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From: Colorado Springs, CO
id also like to mention that the motors you commented on that have low torque numbers were h22s, f20s and k20s.... which come from the factory naturally aspirated, not turboed.... simply adding a turbo will not increase torque much at all.. turbos produce power (depending on turbo size) around 3500-4000 so your only getting 1200 rpms of pull before torque turns into horsepower... and since these motors are typically much higher compression then the 4g63, they have to run low boost..so you will really only see an increase in highend horsepower... as for the 4g63 or many other lower compression motors equipped with a turbo, you can run much higher boost...
so if a 4g63 running 23lbs of boost get full boost at 4000rpms that will register as torque on a dyno until it reaches 5250 rpms in which it switches to horsepower... and the same goes for a k20 w/ a turbo.. but the lower boost will keep the torque numbers down.. 23lbs of boost versus 10-15lbs of boost will be dramatically different when it comes to torque..
also turbo size plays a huge role... some like smaller turbos that create a good linear amount of torque to horsepower which is great for road racing and such... and other like ***** out drag racing where giant turbos with gobs of peak horsepower is where you need it.... so there are many variables
so if a 4g63 running 23lbs of boost get full boost at 4000rpms that will register as torque on a dyno until it reaches 5250 rpms in which it switches to horsepower... and the same goes for a k20 w/ a turbo.. but the lower boost will keep the torque numbers down.. 23lbs of boost versus 10-15lbs of boost will be dramatically different when it comes to torque..
also turbo size plays a huge role... some like smaller turbos that create a good linear amount of torque to horsepower which is great for road racing and such... and other like ***** out drag racing where giant turbos with gobs of peak horsepower is where you need it.... so there are many variables
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Feb 21, 2009 | 06:58 PM
#17
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From: dominican republic
I've noticed that other 2.0L or higher displacement turbo motors other than the 4G63t, have low torque numbers. Is this because most people are tuning for peak power rather than balance? Take for instance an SR20DET is capable of cranking out numbers that would be considered balance. Such as 400whp; 400wtq but you have turbo H22a, F20c and K20a's with the same "whp", but the "wtq" in the 200 or low 300 range. You even have EVO's with the same "unbalanced" numbers. Is this because of the tuning involved? I like it when I see tuning with numbers like 400whp; 400wtq or even 600whp; 550wtq. It just looks more attractive to me (just my opinion) than 700whp and 400wtq
....where is the balance?
....where is the balance? 
Feb 23, 2009 | 11:29 AM
#19
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From: Colorado Springs, CO
Feb 23, 2009 | 12:21 PM
#21
Not everyone is just trying to make big peak numbers There are definitely those of us that are concerned about torque numbers and size of the power band. Yes there are many guys on here, that goal is to make the biggest number, shops do it too; mostly to attract those customers. However if they are not racing, then they don't know how they want there power delivery, as they have no gripes about it. Someone that road races, may want the car set up lots of different ways. They could be limited to how much grip they have based on their class and not want as much torque down low because they just spin the tires coming out of the apex, or prefer to reach higher straight away speeds. On the flip side if the track is very technical, or has tight radius turns, uphill exits, etc. more low end torque may be desired to pull the car out of the turn. Basically a matter of driver preference and what track the car will be used on.
As for the AMS challenge engine, you can throw rocks if you want to about the numbers, but have you seen the Dyno chart?!
Great power band Yes the HUGE turbo is a little much for me and thats way too much power for road race, but the power band is still incredible. If you recall, that engine challenge, was not about peak numbers.
There are definitely those of us that are concerned about torque numbers and size of the power band. Yes there are many guys on here, that goal is to make the biggest number, shops do it too; mostly to attract those customers. However if they are not racing, then they don't know how they want there power delivery, as they have no gripes about it. Someone that road races, may want the car set up lots of different ways. They could be limited to how much grip they have based on their class and not want as much torque down low because they just spin the tires coming out of the apex, or prefer to reach higher straight away speeds. On the flip side if the track is very technical, or has tight radius turns, uphill exits, etc. more low end torque may be desired to pull the car out of the turn. Basically a matter of driver preference and what track the car will be used on.As for the AMS challenge engine, you can throw rocks if you want to about the numbers, but have you seen the Dyno chart?!
Great power band Yes the HUGE turbo is a little much for me and thats way too much power for road race, but the power band is still incredible. If you recall, that engine challenge, was not about peak numbers.