Highest NA Torque?
07-25-2008, 10:10 AM
#6
I swear I saw someone with 265wtq on an 07 with some mods and a tune in their sig!? I love torque, but I also accept what the VQ gives me (245wtq) and work with it. Short of going FI or with bigger displacement in our cars, I opted for shorter gearing (3.9) and not loading my car up with 200lbs of stereo equip. or an additional 30lbs in body cosmetics!
nawz DJ... nawz! lol, i hate that word
Zquicksilver
nawz DJ... nawz! lol, i hate that word
Zquicksilver
Last edited by Zquicksilver; 07-25-2008 at 10:14 AM.
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07-29-2008, 12:32 PM
#8
Originally Posted by shakuya88
A 4.2L stroked build NA VQ could prob hit 350 torque on a good day. I really have no idea on the actual number but it would br pretty good compaired to 3.5L
The new M3 motor (4.0L-V8-ITBs) creates 295lbs.tq. @ 3900k and 414 @ 8400. BMW says they gave up HP on the top end for some grunt at the low end... and I would consider anything below 3900 low end on their scale, lol.
This why I'm ok with my TQ numbers, if in fact the dynapack at GRD is accurate. 245wtq. @ 17% drivetrain loss puts me at 295lbs.tq at the flywheel. Its a little confusing though... the fact that my 3.5L puts down almost the same numbers as the 4.0L @ 3900!? This can't be right or can it?
I've been wondering about this for a while...
Zquicksilver
07-29-2008, 03:04 PM
#9
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Originally Posted by djnc
no one cares about torque?...i'd figure low end power would be important too 
07-30-2008, 05:17 AM
#12
Originally Posted by 13SECZ
I hit 272 tq on a dyno jet...
damn... so your telling us you put down 328 lbs. tq. (factoring in a 17% drivetrain loss) at the flywheel!? That is one impressive 213 cu. in. engine!!!
are you running a 16:1 compression ratio or reving up to like 14k, creating your peak tq. at like 9k?
Zquicksilver
07-31-2008, 12:02 PM
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Torque is a function of displacement and C/R .............notice that 75-77 lb/ft per liter at flywheel is a very high number for N/A . Direct injections can achieve 81-83 lb/ft per liter thanks to 8% more air [fuel not taking up room during intake].
Anytime a N/A reads higher after reverse correcting on dyno, the dyno is probably wrong [correction factor].
Anytime a N/A reads higher after reverse correcting on dyno, the dyno is probably wrong [correction factor].
08-02-2008, 05:35 AM
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Where people get confused is that driveline loss increases with rotational speed of components, so you cannot use the same 15% for HP peak rpm as you do for mid rpm torque where losses might be 10% or less!
The only way to measure engine output at flywheel is to pull engine and place on a dyno..............all this reverse calculation from a chasssis dyno is full of errors.
The only way to measure engine output at flywheel is to pull engine and place on a dyno..............all this reverse calculation from a chasssis dyno is full of errors.
