I don't think you can answer it form a peak torque number. What rate does the torque rise at? The second engine could be making 299 HP at 8000 rpm, which would mean it's making almost double the hp of the first one....
Originally posted by Dissident@Nov 27 2004, 05:49 PM I don't think you can answer it form a peak torque number. What rate does the torque rise at? The second engine could be making 299 HP at 8000 rpm, which would mean it's making almost double the hp of the first one....
Hold on I change my opinion..looking at where in the powerband the both engines produce peak TQ and peak HP I say they perform the same if your comparing straight line acceleration..One engine will get going faster the other engine will catch up on the top end..THERE THE SAME!!!
Continued till tomorrow night. I must say I had hoped that this would spur more discussion! Anyway, I'm sure we'll have more to discuss once the correct answer is in...complete with explaination of course
Assuming that it is a 1/4mile, I would still say that the car with 300ft/lb torque at 4000 rpm. More torque is being delivered at low rpm while the car is starting from a standstill. Also, once the car is already moving it will be easier to keep it accelerating especially in higher gears at lower rpms. If the gearing on the car is such that it will be in 5th gear at around 4000 rpms by the end of the 1/4 mile, then the car will have the advantage because it was able to use more of its available torque as opposed to the other car because it will still be in 4th.
Those numbers could come from the SAME engine. For example, an engine could produce 300ft/lbs of tq at 4K rpm's, and remember, these are non-linear figures. The curve could drop off past peak up to 8K rpm, and in fact, equal 150ft/lbs.
Now if you asked what is better for acceleration: an engine with 300ft/lbs of tq and 150hp, or an engine with 150ft/lbs of tq, and 300hp then the results would be different (favoring the higher tq numbers for acceleration).
In conclusion, the question you posed does not contain enough information to make an informed decision, which could be why not many voted. Fun topic tho..
Ok, more importantly, which accelerates faster, a 2004 Track 350Z or a 2005 special edition?
I thikn if torque was the only thing that mattered in accelration, we'd all be driving diesels that make 350 lbs of torque (and 150 hp). Harleys make more torque than most sportbikes, but good luck making one quicker, gearing or not...
Hey guys, I'm new to the site.
I own a 2003 Nissan 350z with 67k miles.
Can anyone give me a site or book that would go into detail on an ls2 engine swap?
Also are there any good places to sell the old engine?
Wondering if anyone could give me the heads up in regards to gas to use in my 350Z. Previously had a maxima that I only used regualr unleaded in instead of the premium unleaded like was plastered all over the gas cap and manual and never had one problem (turned 200,000 miles last week)....does...
This is the discussion topic for the wiki article: <A HREF=http://350z-tech.com/zwiki/Engine_Modification_Guide_-_Naturally_Aspirated>Engine Modification Guide - Naturally Aspirated</A>
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